45 results on '"Tierney, Megan"'
Search Results
2. Coastal connectivity of marine predators over the Patagonian Shelf during the highly pathogenic avian influenza outbreak.
- Author
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Riaz, Javed, Orben, Rachael A., Gamble, Amandine, Catry, Paulo, Granadeiro, José P., Campioni, Letizia, Tierney, Megan, and Baylis, Alastair M. M.
- Subjects
ANIMAL breeding ,ANIMAL tracks ,PREDATORY aquatic animals ,TERRITORIAL waters ,COLONIES (Biology) ,AVIAN influenza ,ANIMAL mechanics - Abstract
Animal movement and population connectivity are key areas of uncertainty in efforts to understand and predict the spread of infectious disease. The emergence of highly pathogenic avian influenza (HPAI) in South America poses a significant threat to globally significant populations of colonial breeding marine predators in the South Atlantic. Yet, there is a poor understanding of which species or migratory pathways may facilitate disease spread. Compiling one of the largest available animal tracking datasets in the South Atlantic, we examine connectivity and inter‐population mixing for colonial breeding marine predators tagged at the Falkland Islands. We reveal extensive connectivity for three regionally dominant and gregarious species over the Patagonian Shelf. Black‐browed albatrosses (BBA), South American fur seals (SAFS) and Magellanic penguins (MAG) used coastal waters along the Atlantic coast of South America (Argentina and Uruguay). These behaviours were recorded at or in close proximity to breeding colonies and haul‐out areas with dense aggregations of marine predators. Transit times to and from the Falkland Islands to the continental coast ranged from 0.2–70 days, with 84% of animals making this transit within 4 days ‐ a conservative estimate for HPAI infectious period. Our findings demonstrate BBA, SAFS and MAG connectivity between the Falkland Islands and mainland South America over an expansive spatial network and numerous pathways, which has implications for infectious disease persistence, transmission and spread. This information is vital in supporting HPAI disease surveillance, risk assessment and marine management efforts across the region. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
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3. Habitat use and spatial fidelity of male South American sea lions during the nonbreeding period
- Author
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Baylis, Alastair MM, Orben, Rachael A, Costa, Daniel P, Tierney, Megan, Brickle, Paul, and Staniland, Iain J
- Subjects
Environmental Sciences ,Zoology ,Ecology ,Biological Sciences ,Life on Land ,foraging site fidelity ,juveniles ,niche width ,Otaria byronia ,repeatability ,resource partitioning ,stable isotopes ,Evolutionary Biology ,Evolutionary biology ,Ecological applications - Abstract
Conditions experienced during the nonbreeding period have profound long-term effects on individual fitness and survival. Therefore, knowledge of habitat use during the nonbreeding period can provide insights into processes that regulate populations. At the Falkland Islands, the habitat use of South American sea lions (Otaria flavescens) during the nonbreeding period is of particular interest because the population is yet to recover from a catastrophic decline between the mid-1930s and 1965, and nonbreeding movements are poorly understood. Here, we assessed the habitat use of adult male (n = 13) and juvenile male (n = 6) South American sea lions at the Falkland Islands using satellite tags and stable isotope analysis of vibrissae. Male South American sea lions behaved like central place foragers. Foraging trips were restricted to the Patagonian Shelf and were typically short in distance and duration (127 ± 66 km and 4.1 ± 2.0 days, respectively). Individual male foraging trips were also typically characterized by a high degree of foraging site fidelity. However, the isotopic niche of adult males was smaller than juvenile males, which suggested that adult males were more consistent in their use of foraging habitats and prey over time. Our findings differ from male South American sea lions in Chile and Argentina, which undertake extended movements during the nonbreeding period. Hence, throughout their breeding range, male South American sea lions have diverse movement patterns during the nonbreeding period that intuitively reflects differences in the predictability or accessibility of preferred prey. Our findings challenge the long-standing notion that South American sea lions undertake a winter migration away from the Falkland Islands. Therefore, impediments to South American sea lion population recovery likely originate locally and conservation measures at a national level are likely to be effective in addressing the decline and the failure of the population to recover. more...
- Published
- 2017
4. Connectivity of marine predators over the Patagonian Shelf during the highly pathogenic avian influenza (HPAI) outbreak
- Author
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Riaz, Javed, primary, Orben, Rachael A, additional, Gamble, Amandine, additional, Tierney, Megan, additional, Catry, Paulo, additional, Campioni, Letizia, additional, Granadeiro, Jose P, additional, and Baylis, Alastair M. M, additional more...
- Published
- 2023
- Full Text
- View/download PDF
5. Geographic variation in the foraging behaviour of South American fur seals
- Author
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Baylis, Alastair M. M., Tierney, Megan, Orben, Rachael A., Staniland, Iain J., and Brickle, Paul
- Published
- 2018
6. Habitat use of adult male South American fur seals and a preliminary assessment of spatial overlap with trawl fisheries in the South Atlantic
- Author
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Baylis, Alastair M.M., Tierney, Megan, Staniland, Iain J., and Brickle, Paul
- Published
- 2018
- Full Text
- View/download PDF
7. Diving efficiency at depth and pre-breeding foraging effort increase with haemoglobin levels in gentoo penguins
- Author
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McComb-Turbitt, Sarah P., primary, Crossin, Glenn T., additional, Tierney, Megan, additional, Brickle, Paul, additional, Trathan, Philip, additional, Williams, Tony D., additional, and Auger-Méthé, Marie, additional more...
- Published
- 2023
- Full Text
- View/download PDF
8. Potential for redistribution of post‐moult habitat for Eudyptes penguins in the Southern Ocean under future climate conditions
- Author
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Green, Cara‐Paige, Green, David B., Ratcliffe, Norman, Thompson, David, Lea, Mary‐Anne, Baylis, Alastair M. M., Bond, Alexander L., Bost, Charles‐André, Crofts, Sarah, Cuthbert, Richard J., González‐Solís, Jacob, Morrison, Kyle W., Poisblau, Maud, Pütz, Klemens, Rey, Andrea Raya, Ryan, Peter G., Sagar, Paul M., Steinfurth, Antje, Thiebot, Jean‐Baptiste, Tierney, Megan, Whitehead, T. Otto, Wotherspoon, Simon, Hindell, Mark A., Green, Cara‐Paige, Green, David B., Ratcliffe, Norman, Thompson, David, Lea, Mary‐Anne, Baylis, Alastair M. M., Bond, Alexander L., Bost, Charles‐André, Crofts, Sarah, Cuthbert, Richard J., González‐Solís, Jacob, Morrison, Kyle W., Poisblau, Maud, Pütz, Klemens, Rey, Andrea Raya, Ryan, Peter G., Sagar, Paul M., Steinfurth, Antje, Thiebot, Jean‐Baptiste, Tierney, Megan, Whitehead, T. Otto, Wotherspoon, Simon, and Hindell, Mark A. more...
- Abstract
Anthropogenic climate change is resulting in spatial redistributions of many species. We assessed the potential effects of climate change on an abundant and widely distributed group of diving birds, Eudyptes penguins, which are the main avian consumers in the Southern Ocean in terms of biomass consumption. Despite their abundance, several of these species have undergone population declines over the past century, potentially due to changing oceanography and prey availability over the important winter months. We used light-based geolocation tracking data for 485 individuals deployed between 2006 – 2020 across 10 of the major breeding locations for five taxa of Eudyptes penguins. We used Boosted Regression Tree modelling to quantify post-moult habitat preference for southern rockhopper (E. chrysocome), eastern rockhopper (E. filholi), northern rockhopper (E. moseleyi) and macaroni/royal (E. chrysolophus and E. schlegeli) penguins. We then modelled their redistribution under two climate change scenarios, Representative Concentration Pathways RCP4.5 and RCP8.5 (for the end of the century, 2071 – 2100). As climate forcings differ regionally, we quantified redistribution in the Atlantic, Central Indian, East Indian, West Pacific, and East Pacific regions. We found sea surface temperature and sea surface height to be the most important predictors of current habitat for these penguins; physical features that are changing rapidly in the Southern Ocean. Our results indicated that the less severe RCP4.5 would lead to less habitat loss than the more severe RCP8.5. The five taxa of penguin may experience a general poleward redistribution of their preferred habitat, but with contrasting effects in the i) change in total area of preferred habitat under climate change ii) according to geographic region and iii) the species (macaroni/royal vs rockhopper populations). Our results provide further understanding on the regional impacts and vulnerability of species to climate change. more...
- Published
- 2023
9. Important At-Sea Areas of Colonial Breeding Marine Predators on the Southern Patagonian Shelf
- Author
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Baylis, Alastair M. M., Tierney, Megan, Orben, Rachael A., Warwick-Evans, Victoria, Wakefield, Ewan, Grecian, W. James, Trathan, Phil, Reisinger, Ryan, Ratcliffe, Norman, Croxall, John, Campioni, Letizia, Catry, Paulo, Crofts, Sarah, Boersma, P. Dee, Galimberti, Filippo, Granadeiro, José P., Handley, Jonathan, Hayes, Sean, Hedd, April, Masello, Juan F., Montevecchi, William A., Pütz, Klemens, Quillfeldt, Petra, Rebstock, Ginger A., Sanvito, Simona, Staniland, Iain J., and Brickle, Paul more...
- Published
- 2019
- Full Text
- View/download PDF
10. Author Correction: Important At-Sea Areas of Colonial Breeding Marine Predators on the Southern Patagonian Shelf
- Author
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Baylis, Alastair M. M., Tierney, Megan, Orben, Rachael A., Warwick-Evans, Victoria, Wakefield, Ewan, Grecian, W. James, Trathan, Phil, Reisinger, Ryan, Ratcliffe, Norman, Croxall, John, Campioni, Letizia, Catry, Paulo, Crofts, Sarah, Boersma, P. Dee, Galimberti, Filippo, Granadeiro, José P., Handley, Jonathan, Hayes, Sean, Hedd, April, Masello, Juan F., Montevecchi, William A., Pütz, Klemens, Quillfeldt, Petra, Rebstock, Ginger A., Sanvito, Simona, Staniland, Iain J., and Brickle, Paul more...
- Published
- 2019
- Full Text
- View/download PDF
11. Potential for redistribution of post‐moult habitat for Eudyptes penguins in the Southern Ocean under future climate conditions
- Author
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Green, Cara‐Paige, primary, Green, David B., additional, Ratcliffe, Norman, additional, Thompson, David, additional, Lea, Mary‐Anne, additional, Baylis, Alastair M. M., additional, Bond, Alexander L., additional, Bost, Charles‐André, additional, Crofts, Sarah, additional, Cuthbert, Richard J., additional, González‐Solís, Jacob, additional, Morrison, Kyle W., additional, Poisbleau, Maud, additional, Pütz, Klemens, additional, Rey, Andrea Raya, additional, Ryan, Peter G., additional, Sagar, Paul M., additional, Steinfurth, Antje, additional, Thiebot, Jean‐Baptiste, additional, Tierney, Megan, additional, Whitehead, Thomas Otto, additional, Wotherspoon, Simon, additional, and Hindell, Mark A., additional more...
- Published
- 2022
- Full Text
- View/download PDF
12. Factors Associated with Suicide Ideation in Severely Obese Bariatric Surgery-Seeking Individuals
- Author
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Chen, Eunice Y., Fettich, Karla C., and Tierney, Megan
- Abstract
There are high rates of suicide ideation and/or behavior in severely obese individuals. The potential contributors to suicide ideation in a sample of 334 severely obese bariatric surgery candidates was explored. Lack of college education, a history of suicide ideation and/or behavior, psychological distress, hopelessness, loneliness, history of physical and/or sexual abuse, and lifetime major depression were associated with current suicide ideation. Some of the correlates of suicide ideation in severely obese bariatric surgery-seeking samples are similar to those found in the general community and this knowledge may serve to improve the psychological assessment and care for this group. (Contains 2 tables.) more...
- Published
- 2012
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13. Mismatches in scale between highly mobile marine megafauna and marine protected areas
- Author
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Conners, Melinda G., primary, Sisson, Nicholas B., additional, Agamboue, Pierre D., additional, Atkinson, Philip W., additional, Baylis, Alastair M. M., additional, Benson, Scott R., additional, Block, Barbara A., additional, Bograd, Steven J., additional, Bordino, Pablo, additional, Bowen, W. D., additional, Brickle, Paul, additional, Bruno, Ignacio M., additional, González Carman, Victoria, additional, Champagne, Cory D., additional, Crocker, Daniel E., additional, Costa, Daniel P., additional, Dawson, Tiffany M., additional, Deguchi, Tomohiro, additional, Dewar, Heidi, additional, Doherty, Philip D., additional, Eguchi, Tomo, additional, Formia, Angela, additional, Godley, Brendan J., additional, Graham, Rachel T., additional, Gredzens, Christian, additional, Hart, Kristen M., additional, Hawkes, Lucy A., additional, Henderson, Suzanne, additional, Henry, Robert William, additional, Hückstädt, Luis A., additional, Irvine, Ladd M., additional, Kienle, Sarah S., additional, Kuhn, Carey E., additional, Lidgard, Damian, additional, Loredo, Stephanie A., additional, Mate, Bruce R., additional, Metcalfe, Kristian, additional, Nzegoue, Jacob, additional, Kouerey Oliwina, Carmen K., additional, Orben, Rachael A., additional, Ozaki, Kiyoaki, additional, Parnell, Richard, additional, Pike, Elizabeth P., additional, Robinson, Patrick W., additional, Rosenbaum, Howard C., additional, Sato, Fumio, additional, Shaffer, Scott A., additional, Shaver, Donna J., additional, Simmons, Samantha E., additional, Smith, Brian J., additional, Sounguet, Guy-Philippe, additional, Suryan, Robert M., additional, Thompson, David R., additional, Tierney, Megan, additional, Tilley, Dominic, additional, Young, Hillary S., additional, Warwick-Evans, Victoria, additional, Weise, Michael J., additional, Wells, Randall S., additional, Wilkinson, Bradley P., additional, Witt, Matthew J., additional, and Maxwell, Sara M., additional more...
- Published
- 2022
- Full Text
- View/download PDF
14. Mismatches in scale between highly mobile marine megafauna and marine protected areas
- Author
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Conners, Melinda G., Sisson, Nicholas B., Agamboue, Pierre D., Atkinson, Philip W., Baylis, Alastair M. M., Benson, Scott R., Block, Barbara A., Bograd, Steven J., Bordino, Pablo, Bowen, W. D., Brickle, Paul, Bruno, Ignacio M., González Carman, Victoria, Champagne, Cory D., Crocker, Daniel E., Costa, Daniel P., Dawson, Tiffany M., Deguchi, Tomohiro, Dewar, Heidi, Doherty, Philip D., Eguchi, Tomo, Formia, Angela, Godley, Brendan J., Graham, Rachel T., Gredzens, Christian, Hart, Kristen M., Hawkes, Lucy A., Henderson, Suzanne, Henry, Robert William, Hückstädt, Luis A., Irvine, Ladd M., Kienle, Sarah S., Kuhn, Carey E., Lidgard, Damian, Loredo, Stephanie A., Mate, Bruce R., Metcalfe, Kristian, Nzegoue, Jacob, Kouerey Oliwina, Carmen K., Orben, Rachael A., Ozaki, Kiyoaki, Parnell, Richard, Pike, Elizabeth P., Robinson, Patrick W., Rosenbaum, Howard C., Sato, Fumio, Shaffer, Scott A., Shaver, Donna J., Simmons, Samantha E., Smith, Brian J., Sounguet, Guy-Philippe, Suryan, Robert M., Thompson, David R., Tierney, Megan, Tilley, Dominic, Young, Hillary S., Warwick-Evans, Victoria, Weise, Michael J., Wells, Randall S., Wilkinson, Bradley P., Witt, Matthew J., Maxwell, Sara M., Conners, Melinda G., Sisson, Nicholas B., Agamboue, Pierre D., Atkinson, Philip W., Baylis, Alastair M. M., Benson, Scott R., Block, Barbara A., Bograd, Steven J., Bordino, Pablo, Bowen, W. D., Brickle, Paul, Bruno, Ignacio M., González Carman, Victoria, Champagne, Cory D., Crocker, Daniel E., Costa, Daniel P., Dawson, Tiffany M., Deguchi, Tomohiro, Dewar, Heidi, Doherty, Philip D., Eguchi, Tomo, Formia, Angela, Godley, Brendan J., Graham, Rachel T., Gredzens, Christian, Hart, Kristen M., Hawkes, Lucy A., Henderson, Suzanne, Henry, Robert William, Hückstädt, Luis A., Irvine, Ladd M., Kienle, Sarah S., Kuhn, Carey E., Lidgard, Damian, Loredo, Stephanie A., Mate, Bruce R., Metcalfe, Kristian, Nzegoue, Jacob, Kouerey Oliwina, Carmen K., Orben, Rachael A., Ozaki, Kiyoaki, Parnell, Richard, Pike, Elizabeth P., Robinson, Patrick W., Rosenbaum, Howard C., Sato, Fumio, Shaffer, Scott A., Shaver, Donna J., Simmons, Samantha E., Smith, Brian J., Sounguet, Guy-Philippe, Suryan, Robert M., Thompson, David R., Tierney, Megan, Tilley, Dominic, Young, Hillary S., Warwick-Evans, Victoria, Weise, Michael J., Wells, Randall S., Wilkinson, Bradley P., Witt, Matthew J., and Maxwell, Sara M. more...
- Abstract
Marine protected areas (MPAs), particularly large MPAs, are increasing in number and size around the globe in part to facilitate the conservation of marine megafauna under the assumption that large-scale MPAs better align with vagile life histories; however, this alignment is not well established. Using a global tracking dataset from 36 species across five taxa, chosen to reflect the span of home range size in highly mobile marine megafauna, we show most MPAs are too small to encompass complete home ranges of most species. Based on size alone, 40% of existing MPAs could encompass the home ranges of the smallest ranged species, while only < 1% of existing MPAs could encompass those of the largest ranged species. Further, where home ranges and MPAs overlapped in real geographic space, MPAs encompassed < 5% of core areas used by all species. Despite most home ranges of mobile marine megafauna being much larger than existing MPAs, we demonstrate how benefits from MPAs are still likely to accrue by targeting seasonal aggregations and critical life history stages and through other management techniques. more...
- Published
- 2022
15. Potential for redistribution of post‐moult habitat for Eudyptes penguins in the Southern Ocean under future climate conditions
- Author
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Green, Cara‐Paige, Green, David B, Ratcliffe, Norman, Thompson, David, Lea, Mary‐Anne, Baylis, Alastair MM, Bond, AL, Bost, Charles‐André, Crofts, Sarah, Cuthbert, Richard J, González‐Solís, Jacob, Morrison, Kyle W, Poisbleau, Maud, Pütz, Klemens, Rey, Andrea Raya, Ryan, Peter G, Sagar, Paul M, Steinfurth, Antje, Thiebot, Jean‐Baptiste, Tierney, Megan, Whitehead, Thomas Otto, Wotherspoon, Simon, Hindell, Mark A, Green, Cara‐Paige, Green, David B, Ratcliffe, Norman, Thompson, David, Lea, Mary‐Anne, Baylis, Alastair MM, Bond, AL, Bost, Charles‐André, Crofts, Sarah, Cuthbert, Richard J, González‐Solís, Jacob, Morrison, Kyle W, Poisbleau, Maud, Pütz, Klemens, Rey, Andrea Raya, Ryan, Peter G, Sagar, Paul M, Steinfurth, Antje, Thiebot, Jean‐Baptiste, Tierney, Megan, Whitehead, Thomas Otto, Wotherspoon, Simon, and Hindell, Mark A more...
- Abstract
Anthropogenic climate change is resulting in spatial redistributions of many species. We assessed the potential effects of climate change on an abundant and widely distributed group of diving birds, Eudyptes penguins, which are the main avian consumers in the Southern Ocean in terms of biomass consumption. Despite their abundance, several of these species have undergone population declines over the past century, potentially due to changing oceanography and prey availability over the important winter months. We used light-based geolocation tracking data for 485 individuals deployed between 2006 and 2020 across 10 of the major breeding locations for five taxa of Eudyptes penguins. We used boosted regression tree modelling to quantify post-moult habitat preference for southern rockhopper (E. chrysocome), eastern rockhopper (E. filholi), northern rockhopper (E. moseleyi) and macaroni/royal (E. chrysolophus and E. schlegeli) penguins. We then modelled their redistribution under two climate change scenarios, representative concentration pathways RCP4.5 and RCP8.5 (for the end of the century, 2071-2100). As climate forcings differ regionally, we quantified redistribution in the Atlantic, Central Indian, East Indian, West Pacific and East Pacific regions. We found sea surface temperature and sea surface height to be the most important predictors of current habitat for these penguins; physical features that are changing rapidly in the Southern Ocean. Our results indicated that the less severe RCP4.5 would lead to less habitat loss than the more severe RCP8.5. The five taxa of penguin may experience a general poleward redistribution of their preferred habitat, but with contrasting effects in the (i) change in total area of preferred habitat under climate change (ii) according to geographic region and (iii) the species (macaroni/royal vs. rockhopper populations). Our results provide further understanding on the regional impacts and vulnerability of species to climate change. more...
- Published
- 2022
16. Adelie penguin response parameters signal reduced prey accessibility: implications for predator-prey response curves
- Author
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Emmerson, Louise, Southwell, Colin, Clarke, Judy, Tierney, Megan, and Kerry, Knowles
- Subjects
Foraging (Animal feeding behavior) -- Research ,Breeding colonies -- Research ,Adelie penguin -- Research ,Biological sciences - Abstract
Seabirds are often proposed as useful indicators of marine ecosystems because of their typically tight response to varying levels of prey abundance. We demonstrate here how this relationship can be modified for Southern Ocean higher-order predators when prey accessibility changes as a consequence of the temporally varying sea-ice environment. We examined within- and between-year fluctuations in breeding success, foraging trip duration, meal mass and fledgling weights of Adelie penguins (Pygoscelis adeliae) at Bechervaise Island (67°35'S, 62°49'E) in east Antarctica to determine the degree of concordance between parameters over a 12-year period and how these varied in relation to sea-ice conditions. The penguins responded to extensive sea-ice (predominantly fast-ice) adjacent to their breeding colony by lengthening their foraging trips, and these years typically had reduced breeding success. Some years indicated good conditions for the penguins across parameters and had relatively high breeding success with heavier fledglings, while others indicated difficult conditions with poorer breeding success and lighter fledglings. In other years, there was discordance in the patterns of breeding success, fledgling mass and early versus late stage foraging trip durations, suggestive of different thresholds for different parameters or within-year changes in resource availability. Our results highlight the importance of accounting for the temporal variability in prey availability as a function of both accessibility and abundance when interpreting predator response curves., Author(s): Louise Emmerson[sup.1] , Colin Southwell[sup.1] , Judy Clarke[sup.1] , Megan Tierney[sup.1] [sup.2] , Knowles Kerry[sup.1] Author Affiliations: (1) Department of Environment, Australian Antarctic Division, Channel Highway, 7050, Kingston, TAS, [...] more...
- Published
- 2015
- Full Text
- View/download PDF
17. Paradise on Earth or a land of many problems? Challenging perceptions of Sri Lanka through enquiry
- Author
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Tierney, Megan
- Published
- 2010
18. Global Biodiversity: Indicators of Recent Declines
- Author
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Butchart, Stuart H. M., Walpole, Matt, Collen, Ben, van Strien, Arco, Scharlemann, Jörn P. W., Almond, Rosamunde E. A., Baillie, Jonathan E. M., Bomhard, Bastian, Brown, Claire, Bruno, John, Carpenter, Kent E., Carr, Geneviève M., Chanson, Janice, Chenery, Anna M., Csirke, Jorge, Davidson, Nick, Dentener, Frank, Foster, Matt, Galli, Alessandro, Galloway, James N., Genovesi, Piero, Gregory, Richard D., Hockings, Marc, Kapos, Valerie, Lamarque, Jean-Francois, Leverington, Fiona, Loh, Jonathan, McGeoch, Melodie A., McRae, Louise, Minasyan, Anahit, Morcillo, Monica Hernández, Oldfield, Thomasina E. E., Pauly, Daniel, Quader, Suhel, Revenga, Carmen, Sauer, John R., Skolnik, Benjamin, Spear, Dian, Stanwell-Smith, Damon, Stuart, Simon N., Symes, Andy, Tierney, Megan, Tyrrell, Tristan D., Vié, Jean-Christophe, and Watson, Reg more...
- Published
- 2010
19. Evaluating and using stable-isotope analysis to infer diet composition and foraging ecology of Adélie penguins Pygoscelis adeliae
- Author
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Tierney, Megan, Southwell, Colin, Emmerson, Louise M., and Hindell, Mark A.
- Published
- 2008
20. Perfluorinated compounds in the Antarctic region: Ocean circulation provides prolonged protection from distant sources
- Author
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Bengtson Nash, Susan, Rintoul, Stephen R., Kawaguchi, So, Staniland, Iain, Hoff, John van den, Tierney, Megan, and Bossi, Rossana
- Published
- 2010
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- View/download PDF
21. Blood fatty acids indicate inter- and intra-annual variation in the diet of Adélie penguins: Comparison with stomach content and stable isotope analysis
- Author
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Tierney, Megan, Nichols, Peter D., Wheatley, Kathryn E., and Hindell, Mark A.
- Published
- 2008
- Full Text
- View/download PDF
22. Temporal variation in Adélie penguin diet at Béchervaise Island, east Antarctica and its relationship to reproductive performance
- Author
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Tierney, Megan, Emmerson, Louise, and Hindell, Mark
- Published
- 2009
- Full Text
- View/download PDF
23. Hematopoietic Fingerprints: An Expression Database of Stem Cells and Their Progeny
- Author
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Chambers, Stuart M., Boles, Nathan C., Lin, Kuan-Yin K., Tierney, Megan P., Bowman, Teresa V., Bradfute, Steven B., Chen, Alice J., Merchant, Akil A., Sirin, Olga, Weksberg, David C., Merchant, Mehveen G., Fisk, C. Joseph, Shaw, Chad A., and Goodell, Margaret A. more...
- Published
- 2007
- Full Text
- View/download PDF
24. An Arabidopsis basic helix-loop-helix leucine zipper protein modulates metal homeostasis and auxin conjugate responsiveness
- Author
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Rampey, Rebekah A., Woodward, Andrew W., Hobbs, Brianne N., Tierney, Megan P., Lahner, Brett, Salt, David E., and Bartel, Bonnie
- Subjects
Homeostasis -- Research ,Arabidopsis -- Genetic aspects ,Arabidopsis -- Research ,Leucine -- Research ,Biological sciences - Abstract
The plant hormone auxin can be regulated by formation and hydrolysis of amide-linked indole-3-acetic acid (IAA) conjugates. Here, we report the characterization of the dominant Arabidopsis iaa-leucine resistant3 (ilr3-1) mutant, which has reduced sensitivity to IAA-Leu and IAA-Phe, while retaining wild-type responses to free IAA. The gene defective in ilr3-1 encodes a basic helix-loop-helix leucine zipper protein, bHLH105, and the ilr3-1 lesion results in a truncated product. Overexpressing ilr3-1 in wild-type plants recapitulates certain ilr3-1 mutant phenotypes. In contrast, the loss-of-function ilr3-2 allele has increased IAA-Leu sensitivity compared to wild type, indicating that the ilr3-1 allele confers a gain of function. Microarray and quantitative real-time PCR analyses revealed five downregulated genes in ilr3-1, including three encoding putative membrane proteins similar to the yeast iron and manganese transporter Ccc1p. Transcript changes are accompanied by reciprocally misregulated metal accumulation in ilr3-1 and ilr3-2 mutants. Further, ilr3-1 seedlings are less sensitive than wild type to manganese, and auxin conjugate response phenotypes are dependent on exogenous metal concentration in ilr3 mutants. These data suggest a model in which the ILR3/bHLH105 transcription factor regulates expression of metal transporter genes, perhaps indirectly modulating IAA-conjugate hydrolysis by controlling the availability of metals previously shown to influence IAA-amino acid hydrolase protein activity. more...
- Published
- 2006
25. Integrated Psychosocial Group Treatment: A Randomized Pilot Trial of a Harm Reduction and Preventive Approach for Patients with Chronic Pain at Risk of Opioid Misuse
- Author
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Hruschak, Valerie, primary, Rosen, Daniel, additional, Tierney, Megan, additional, Eack, Shaun M, additional, Wasan, Ajay D, additional, and Cochran, Gerald, additional
- Published
- 2021
- Full Text
- View/download PDF
26. Non‐breeding movements of Gentoo Penguins at the Falkland Islands
- Author
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Baylis, Alastair M. M., primary, Tierney, Megan, additional, Orben, Rachael A., additional, González de la Peña, Daniel, additional, and Brickle, Paul, additional
- Published
- 2020
- Full Text
- View/download PDF
27. Important At-Sea Areas of Colonial Breeding Marine Predators on the Southern Patagonian Shelf
- Author
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Baylis, Alastair M.M., Tierney, Megan, Orben, Rachael A., Warwick-Evans, Victoria, Wakefield, Ewan, Grecian, W. James, Trathan, Phil, Reisinger, Ryan, Ratcliffe, Norman, Croxall, John, Campioni, Letizia, Catry, Paulo, Crofts, Sarah, Boersma, P. Dee, Galimberti, Filippo, Granadeiro, Jose, Handley, Jonathan, Hayes, Sean, Hedd, April, Masello, Juan F., Montevecchi, Willliam A., Pütz, Klemens, Quillfeldt, Petra, Rebstock, Ginger A., Sanvito, Simona, Staniland, Iain J., Brickle, Paul, Baylis, Alastair M.M., Tierney, Megan, Orben, Rachael A., Warwick-Evans, Victoria, Wakefield, Ewan, Grecian, W. James, Trathan, Phil, Reisinger, Ryan, Ratcliffe, Norman, Croxall, John, Campioni, Letizia, Catry, Paulo, Crofts, Sarah, Boersma, P. Dee, Galimberti, Filippo, Granadeiro, Jose, Handley, Jonathan, Hayes, Sean, Hedd, April, Masello, Juan F., Montevecchi, Willliam A., Pütz, Klemens, Quillfeldt, Petra, Rebstock, Ginger A., Sanvito, Simona, Staniland, Iain J., and Brickle, Paul more...
- Abstract
The Patagonian Shelf Large Marine Ecosystem supports high levels of biodiversity and endemism and is one of the most productive marine ecosystems in the world. Despite the important role marine predators play in structuring the ecosystems, areas of high diversity where multiple predators congregate remains poorly known on the Patagonian Shelf. Here, we used biotelemetry and biologging tags to track the movements of six seabird species and three pinniped species breeding at the Falkland Islands. Using Generalized Additive Models, we then modelled these animals’ use of space as functions of dynamic and static environmental indices that described their habitat. Based on these models, we mapped the predicted distribution of animals from both sampled and unsampled colonies and thereby identified areas where multiple species were likely to overlap at sea. Maximum foraging trip distance ranged from 79 to 1,325 km. However, most of the 1,891 foraging trips by 686 animals were restricted to the Patagonian Shelf and shelf slope, which highlighted a preference for these habitats. Of the seven candidate explanatory covariates used to predict distribution, distance from the colony was retained in models for all species and negatively affected the probability of occurrence. Predicted overlap among species was highest on the Patagonian Shelf around the Falkland Islands and the Burdwood Bank. The predicted area of overlap is consistent with areas that are also important habitat for marine predators migrating from distant breeding locations. Our findings provide comprehensive multi-species predictions for some of the largest marine predator populations on the Patagonian Shelf, which will contribute to future marine spatial planning initiatives. Crucially, our findings highlight that spatially explicit conservation measures are likely to benefit multiple species, while threats are likely to impact multiple species. more...
- Published
- 2019
28. Non‐breeding movements of Gentoo Penguins at the Falkland Islands.
- Author
-
Baylis, Alastair M. M., Tierney, Megan, Orben, Rachael A., González de la Peña, Daniel, and Brickle, Paul
- Subjects
PENGUINS ,GENE flow ,POPULATION dynamics ,ISLANDS - Abstract
Although many penguin species migrate during the non‐breeding period, Gentoo Penguins Pygoscelis papua are year‐round residents. Despite being characterized as inshore feeders, the at‐sea spatial usage of Gentoo Penguins during the non‐breeding period, when central place foraging constraints are relaxed, is poorly understood. Here, we tracked the movements of Gentoo Penguins from five breeding colonies at the Falkland Islands, globally one of the largest Gentoo Penguin breeding populations. Gentoo Penguin movement patterns during the non‐breeding period were complex, which likely reflects a high degree of foraging plasticity. Specifically, considerable individual variation existed in foraging trip distance, duration and fidelity to deployment location. For example, maximum foraging trip distance for individual penguins ranged from 64 to 600 km from the colony location (or 480 km from the nearest point on land), and maximum foraging trip duration ranged from 5.7 to 24.8 days. Gentoo Penguin foraging trip distance and duration at the Falkland Islands far exceeded those reported at other locations during the non‐breeding period, and challenge the inshore, diurnal feeding stereotype. Gentoo Penguins also frequently moved between breeding colonies within the Falkland Islands archipelago, but typically returned to their respective colonies, although not necessarily on consecutive foraging trips. Extended movements highlight Gentoo Penguin breeding dispersal capability, which might play a crucial role in population dynamics and gene flow. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
- Full Text
- View/download PDF
29. Geographic variation in the foraging behaviour of South American fur seals
- Author
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Baylis, Alastair M.M., Tierney, Megan, Orben, Rachael A., Staniland, Iain J., Brickle, Paul, Baylis, Alastair M.M., Tierney, Megan, Orben, Rachael A., Staniland, Iain J., and Brickle, Paul
- Abstract
The implicit assumption of many ecological studies is that animal behaviour and resource use are geographically uniform. However, central place foraging species often have geographically isolated breeding colonies that are associated with markedly different habitats. South American fur seals Arctocephalus australis (SAFS) are abundant and widely distributed colonial breeding central place foragers that provide potentially useful insights into geographic variation in animal behaviour and resource use. However, SAFS movement ecology is poorly understood. To address knowledge gaps and to explicitly test geographic variation in behaviour, we examined the foraging behaviour of 9 adult female SAFS from 2 Falkland Islands breeding colonies separated in distance by 200 km. A total of 150 foraging trips over 7 mo revealed striking colony differences. Specifically, SAFS that bred at Volunteer Rocks undertook long foraging trips (mean ± SD: 314 ± 70 km and 15.2 ± 2.7 d) to the Patagonian Shelf and shelf slope (bathymetric depth: 263 ± 28 m). In contrast, SAFS that bred at North Fur Island undertook short foraging trips (94 ± 40 km and 5.3 ± 2.1 d) and typically foraged near the Falkland Islands coastline (bathymetric depth: 85 ± 24 m). Stable isotope analysis of vibrissae δ13C and δ15N values also revealed colony differences in the isotopic niche area occupied, which indicated that resource use also differed. Contrary to popular models (Ashmole’s halo, hinterland model), colony size was unrelated to distance travelled, and SAFS did not necessarily use foraging grounds closest to their breeding colony. SAFS are likely subject to different selective pressures related to different environmental demands at the 2 breeding colonies. Accordingly, we reason that behavioural differences between breeding colonies reflect different phenotypes, and habitat use is more immediately influenced by phenotype, philopatry and the local environment, rather than density-dependent competition typic more...
- Published
- 2018
30. Framework for mapping key areas for marine megafauna to inform Marine Spatial Planning: the Falkland Islands case study
- Author
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Augé, Amelie A., Dias, Maria P., Lascelles, Ben, Baylis, Alastair M.M., Black, Andy, Boersma, P. Dee, Catry, Paulo, Crofts, Sarah, Galimberti, Filippo, Granadeiro, Jose Pedro, Hedd, April, Ludynia, Katrin, Masello, Juan F., Montevecchi, William, Phillips, Richard A., Putz, Klemens, Quillfeldt, Petra, Rebstock, Ginger A., Sanvito, Simona, Staniland, Iain J., Stanworth, Andrew, Thompson, Dave, Tierney, Megan, Trathan, Philip N., Croxall, John P., Augé, Amelie A., Dias, Maria P., Lascelles, Ben, Baylis, Alastair M.M., Black, Andy, Boersma, P. Dee, Catry, Paulo, Crofts, Sarah, Galimberti, Filippo, Granadeiro, Jose Pedro, Hedd, April, Ludynia, Katrin, Masello, Juan F., Montevecchi, William, Phillips, Richard A., Putz, Klemens, Quillfeldt, Petra, Rebstock, Ginger A., Sanvito, Simona, Staniland, Iain J., Stanworth, Andrew, Thompson, Dave, Tierney, Megan, Trathan, Philip N., and Croxall, John P. more...
- Abstract
Marine Spatial Planning (MSP) is becoming a key management approach throughout the world. The process includes the mapping of how humans and wildlife use the marine environment to inform the development of management measures. An integrated multi-species approach to identifying key areas is important for MSP because it allows managers a global representation of an area, enabling them to see where management can have the most impact for biodiversity protection. However, multi-species analysis remains challenging. This paper presents a methodological framework for mapping key areas for marine megafauna (seabirds, pinnipeds, cetaceans) by incorporating different data types across multiple species. The framework includes analyses of tracking data and observation survey data, applying analytical steps according to the type of data available during each year quarter for each species. It produces core-use area layers at the species level, then combines these layers to create megafauna core-use area layers. The framework was applied in the Falkland Islands. The study gathered over 750,000 tracking and at-sea observation locations covering an equivalent of 5495 data days between 1998 and 2015 for 36 species. The framework provides a step-by-step implementation protocol, replicable across geographic scales and transferable to multiple taxa. R scripts are provided. Common repositories, such as the Birdlife International Tracking Database, are invaluable tools, providing a secure platform for storing and accessing spatial data to apply the methodological framework. This provides managers with data necessary to enhance MSP efforts and marine conservation worldwide. more...
- Published
- 2018
31. Framework for mapping key areas for marine megafauna to inform Marine Spatial Planning: The Falkland Islands case study
- Author
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Augé, Amélie A., primary, Dias, Maria P., additional, Lascelles, Ben, additional, Baylis, Alastair M.M., additional, Black, Andy, additional, Boersma, P. Dee, additional, Catry, Paulo, additional, Crofts, Sarah, additional, Galimberti, Filippo, additional, Granadeiro, Jose Pedro, additional, Hedd, April, additional, Ludynia, Katrin, additional, Masello, Juan F., additional, Montevecchi, William, additional, Phillips, Richard A., additional, Pütz, Klemens, additional, Quillfeldt, Petra, additional, Rebstock, Ginger A., additional, Sanvito, Simona, additional, Staniland, Iain J., additional, Stanworth, Andrew, additional, Thompson, Dave, additional, Tierney, Megan, additional, Trathan, Philip N., additional, and Croxall, John P., additional more...
- Published
- 2018
- Full Text
- View/download PDF
32. Habitat use and spatial fidelity of male South American sea lions during the nonbreeding period
- Author
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Baylis, Alastair M. M., Orben, Rachael A., Costa, Daniel P., Tierney, Megan, Brickle, Paul, Staniland, Iain J., Baylis, Alastair M. M., Orben, Rachael A., Costa, Daniel P., Tierney, Megan, Brickle, Paul, and Staniland, Iain J. more...
- Abstract
Conditions experienced during the nonbreeding period have profound long-term effects on individual fitness and survival. Therefore, knowledge of habitat use during the nonbreeding period can provide insights into processes that regulate populations. At the Falkland Islands, the habitat use of South American sea lions (Otaria flavescens) during the nonbreeding period is of particular interest because the population is yet to recover from a catastrophic decline between the mid-1930s and 1965, and nonbreeding movements are poorly understood. Here, we assessed the habitat use of adult male (n = 13) and juvenile male (n = 6) South American sea lions at the Falkland Islands using satellite tags and stable isotope analysis of vibrissae. Male South American sea lions behaved like central place foragers. Foraging trips were restricted to the Patagonian Shelf and were typically short in distance and duration (127 ± 66 km and 4.1 ± 2.0 days, respectively). Individual male foraging trips were also typically characterized by a high degree of foraging site fidelity. However, the isotopic niche of adult males was smaller than juvenile males, which suggested that adult males were more consistent in their use of foraging habitats and prey over time. Our findings differ from male South American sea lions in Chile and Argentina, which undertake extended movements during the nonbreeding period. Hence, throughout their breeding range, male South American sea lions have diverse movement patterns during the nonbreeding period that intuitively reflects differences in the predictability or accessibility of preferred prey. Our findings challenge the long-standing notion that South American sea lions undertake a winter migration away from the Falkland Islands. Therefore, impediments to South American sea lion population recovery likely originate locally and conservation measures at a national level are likely to be effective in addressing the decline and the failure of the population to recov more...
- Published
- 2017
33. Improving measurement and reporting of progress for the United Nations Convention to Combat Desertification
- Author
-
Smith, Jessica, Walpole, Matt, Fancourt, Max, Schulte-Herbruggen, Bjorn, Bubb, Philip, Gassner, Philipp, Misrachi, Murielle, Stanwell-Smith, Damon, and Tierney, Megan
- Published
- 2013
- Full Text
- View/download PDF
34. Developing ecosystem service indicators: experiences and lessons learned from sub-global assessments and other initiatives
- Author
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UNEP-WCMC,, Walpole, Matt, Brown, Claire, Tierney, Megan, Mapendembe, Abisha, Viglizzo, Ernesto, Goethals, Peter, Birge, Traci, Fuentes, Rodrigo, Butchart, Stuart, Höft, Robert, Vackár, David, Koleff, Patricia, Sarukhán, José, Urquiza, Tania, O'Farell, Patrick, Reyers, Belinda, Garcia, Keisha, Girvan, Alexander, Watts, Jim, Stott, Andrew, Larigauderie, Anne, Biala, Katarzyna, Schlatter, Christian, Rodríguez Rodríguez, Davíd, Mainka, Sue, Williams, James, Beltrame, Coralie, Armenteras, Dolors, Marcela, Mónica, Nybo, Signe, Sandlund, Odd Terje, Davidson, Nick, Ghate, Utkarsh, Berg, Hakan, Ash, Neville, Luque Panadero, Victoria Eugenia, Zandri, Edoardo, Doswald, Natalie, Kumar, Chetan, Scharlemann, Jorn, Simpson, Lucy, Tyrell, Tristan, Díaz, Sandra, Linstead, Conor, Espaldon, Maria Victoria, Ringold, Paul, De Groot, Rudolf, van Oudenhoven, Alexander, Lasco, Rodel, Layke, Christian, Barano, Thomas, Hadian, Oki, Bondarev, Alexander, Yashina, Tatyana, Bhagabati, Nirmal, Ricketts, Taylor, and Rosenthal, Amy more...
- Subjects
Earth and Environmental Sciences - Abstract
People depend upon ecosystems to supply a range of services necessary for their survival and well-being. Ecosystem service indicators are critical for knowing whether or not these essential services are being maintained and used in a sustainable manner, thus enabling policy makers to identify the policies and other interventions needed to better manage them. As a result, ecosystem service indicators are of increasing interest and importance to governmental and inter-governmental processes, including amongst others the Convention on Biological Diversity (CBD) and the Aichi Targets contained within its strategic plan for 2011-2020, as well as the emerging Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES). Despite this growing demand, assessing ecosystem service status and trends and developing robust indicators is o!en hindered by a lack of information and data, resulting in few available indicators. In response, the United Nations Environment Programme World Conservation Monitoring Centre (UNEP-WCMC), together with a wide range of international partners and supported by the Swedish International Biodiversity Programme (SwedBio)*, undertook a project to take stock of the key lessons that have been learnt in developing and using ecosystem service indicators in a range of assessment contexts. The project examined the methodologies, metrics and data sources employed in delivering ecosystem service indicators, so as to inform future indicator development. This report presents the principal results of this project. more...
- Published
- 2011
35. Use it or lose it: measuring trends in wild species subject to substantial use
- Author
-
Tierney, Megan, primary, Almond, Rosamunde, additional, Stanwell-Smith, Damon, additional, McRae, Louise, additional, Zöckler, Christoph, additional, Collen, Ben, additional, Walpole, Matt, additional, Hutton, Jon, additional, and de Bie, Steven, additional more...
- Published
- 2014
- Full Text
- View/download PDF
36. The drivers of change in UK ecosystems and ecosystem services [chapter 3]
- Author
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Winn, Jonathan, Tierney, Megan, Heathwaite, A. Louise, Jones, Laurence, Paterson, James, Simpson, Lucy, Thomson, Amanda, Turley, Carol, Winn, Jonathan, Tierney, Megan, Heathwaite, A. Louise, Jones, Laurence, Paterson, James, Simpson, Lucy, Thomson, Amanda, and Turley, Carol more...
- Published
- 2011
37. Perfluorinated compounds in the Antarctic region: Ocean circulation provides prolonged protection from distant sources
- Author
-
Nash, Susan Bengtson, Rintoul, Stephen R., Kawaguchi, So, Staniland, Iain, van den Hoff, John, Tierney, Megan, Bossi, Rossana, Nash, Susan Bengtson, Rintoul, Stephen R., Kawaguchi, So, Staniland, Iain, van den Hoff, John, Tierney, Megan, and Bossi, Rossana more...
- Abstract
In order to investigate the extent to which Perfluorinated Contaminants (PFCs) have permeated the Southern Ocean food web to date, a range of Antarctic, sub-Antarctic and Antarctic-migratory biota were analysed for key ionic PFCs. Based upon the geographical distribution pattern and ecology of biota with detectable vs. non-detectable PFC burdens, an evaluation of the potential contributory roles of alternative system input pathways is made. Our analytical findings, together with previous reports, reveal only the occasional occurrence of PFCs in migratory biota and vertebrate predators with foraging ranges extending into or north of the Antarctic Circumpolar Current (ACC). Geographical contamination patterns observed correspond most strongly with those expected from delivery via hydrospheric transport as governed by the unique oceanographic features of the Southern Ocean. We suggest that hydrospheric transport will form a slow, but primary, input pathway of PFCs to the Antarctic region. Copyright (c) 2010 Elsevier Ltd. All rights reserved. more...
- Published
- 2010
38. An Arabidopsis Basic Helix-Loop-Helix Leucine Zipper Protein Modulates Metal Homeostasis and Auxin Conjugate Responsiveness
- Author
-
Rampey, Rebekah, Woodward, Andrew, Hobbs, Brianne, Tierney, Megan, Lahner, Brett, Salt, David, Bartel, Bonnie, Rampey, Rebekah, Woodward, Andrew, Hobbs, Brianne, Tierney, Megan, Lahner, Brett, Salt, David, and Bartel, Bonnie more...
- Abstract
The plant hormone auxin can be regulated by formation and hydrolysis of amide-linked indole-3-acetic acid (IAA) conjugates. Here, we report the characterization of the dominant Arabidopsis iaa–leucine resistant3 (ilr3-1) mutant, which has reduced sensitivity to IAA–Leu and IAA–Phe, while retaining wild-type responses to free IAA. The gene defective in ilr3-1 encodes a basic helix-loop-helix leucine zipper protein, bHLH105, and the ilr3-1 lesion results in a truncated product. Overexpressing ilr3-1 in wild-type plants recapitulates certain ilr3-1 mutant phenotypes. In contrast, the loss-of-function ilr3-2 allele has increased IAA–Leu sensitivity compared to wild type, indicating that the ilr3-1 allele confers a gain of function. Microarray and quantitative real-time PCR analyses revealed five downregulated genes in ilr3-1, including three encoding putative membrane proteins similar to the yeast iron and manganese transporter Ccc1p. Transcript changes are accompanied by reciprocally misregulated metal accumulation in ilr3-1 and ilr3-2 mutants. Further, ilr3-1 seedlings are less sensitive than wild type to manganese, and auxin conjugate response phenotypes are dependent on exogenous metal concentration in ilr3 mutants. These data suggest a model in which the ILR3/bHLH105 transcription factor regulates expression of metal transporter genes, perhaps indirectly modulating IAA-conjugate hydrolysis by controlling the availability of metals previously shown to influence IAA–amino acid hydrolase protein activity more...
- Published
- 2006
39. Linked indicator sets for addressing biodiversity loss
- Author
-
Sparks, Tim H., primary, Butchart, Stuart H. M., additional, Balmford, Andrew, additional, Bennun, Leon, additional, Stanwell-Smith, Damon, additional, Walpole, Matt, additional, Bates, Nicholas R., additional, Bomhard, Bastian, additional, Buchanan, Graeme M., additional, Chenery, Anna M., additional, Collen, Ben, additional, Csirke, Jorge, additional, Diaz, Robert J., additional, Dulvy, Nicholas K., additional, Fitzgerald, Claire, additional, Kapos, Valerie, additional, Mayaux, Philippe, additional, Tierney, Megan, additional, Waycott, Michelle, additional, Wood, Louisa, additional, and Green, Rhys E., additional more...
- Published
- 2011
- Full Text
- View/download PDF
40. Reversal of secondary pulmonary hypertension by axial and pulsatile mechanical circulatory support
- Author
-
Torre-Amione, Guillermo, primary, Southard, Robert E., additional, Loebe, Matthias M., additional, Youker, Keith A., additional, Bruckner, Brian, additional, Estep, Jerry D., additional, Tierney, Megan, additional, and Noon, George P., additional more...
- Published
- 2010
- Full Text
- View/download PDF
41. Energy content of mesopelagic fish from Macquarie Island
- Author
-
TIERNEY, MEGAN, primary, HINDELL, MARK A., additional, and GOLDSWORTHY, SIMON, additional
- Published
- 2002
- Full Text
- View/download PDF
42. A comparison of techniques used to estimate body condition of southern elephant seals (Mirounga leonina)
- Author
-
Tierney, Megan, primary, Hindell, Mark, additional, Lea, Mary-Anne, additional, and Tollit, Dominic, additional
- Published
- 2001
- Full Text
- View/download PDF
43. Cereal vs. vegetable starch: Evaluation of nutrient digestibility and performance in extruded canine diets.
- Author
-
Tierney, Megan, Elliott, Hannah, Dangprasert, Vareesa, Street, Val, Johnson, Steven, Lowe, John, and White, Gavin A.
- Subjects
ANIMAL nutrition ,BROILER chickens - Published
- 2020
44. Important At-Sea Areas of Colonial Breeding Marine Predators on the Southern Patagonian Shelf
- Author
-
Baylis, Alastair M M, Tierney, Megan, Orben, Rachael A, Warwick-Evans, Victoria, Wakefield, Ewan, Grecian, W James, Trathan, Phil, Reisinger, Ryan, Ratcliffe, Norman, Croxall, John, Campioni, Letizia, Catry, Paulo, Crofts, Sarah, Boersma, P Dee, Galimberti, Filippo, Granadeiro, José P, Handley, Jonathan, Hayes, Sean, Hedd, April, Masello, Juan F, Montevecchi, William A, Pütz, Klemens, Quillfeldt, Petra, Rebstock, Ginger A, Sanvito, Simona, Staniland, Iain J, Brickle, Paul, and Justus Liebig University Giessen more...
- Subjects
13. Climate action ,14. Life underwater ,ddc:570 ,15. Life on land - Abstract
The Patagonian Shelf Large Marine Ecosystem supports high levels of biodiversity and endemism and is one of the most productive marine ecosystems in the world. Despite the important role marine predators play in structuring the ecosystems, areas of high diversity where multiple predators congregate remains poorly known on the Patagonian Shelf. Here, we used biotelemetry and biologging tags to track the movements of six seabird species and three pinniped species breeding at the Falkland Islands. Using Generalized Additive Models, we then modelled these animals' use of space as functions of dynamic and static environmental indices that described their habitat. Based on these models, we mapped the predicted distribution of animals from both sampled and unsampled colonies and thereby identified areas where multiple species were likely to overlap at sea. Maximum foraging trip distance ranged from 79 to 1,325 km. However, most of the 1,891 foraging trips by 686 animals were restricted to the Patagonian Shelf and shelf slope, which highlighted a preference for these habitats. Of the seven candidate explanatory covariates used to predict distribution, distance from the colony was retained in models for all species and negatively affected the probability of occurrence. Predicted overlap among species was highest on the Patagonian Shelf around the Falkland Islands and the Burdwood Bank. The predicted area of overlap is consistent with areas that are also important habitat for marine predators migrating from distant breeding locations. Our findings provide comprehensive multi-species predictions for some of the largest marine predator populations on the Patagonian Shelf, which will contribute to future marine spatial planning initiatives. Crucially, our findings highlight that spatially explicit conservation measures are likely to benefit multiple species, while threats are likely to impact multiple species. more...
45. Potential for redistribution of post-moult habitat for Eudyptes penguins in the Southern Ocean under future climate conditions.
- Author
-
Green CP, Green DB, Ratcliffe N, Thompson D, Lea MA, Baylis AMM, Bond AL, Bost CA, Crofts S, Cuthbert RJ, González-Solís J, Morrison KW, Poisbleau M, Pütz K, Rey AR, Ryan PG, Sagar PM, Steinfurth A, Thiebot JB, Tierney M, Whitehead TO, Wotherspoon S, and Hindell MA more...
- Subjects
- Humans, Animals, Plant Breeding, Ecosystem, Forecasting, Climate Change, Oceans and Seas, Spheniscidae
- Abstract
Anthropogenic climate change is resulting in spatial redistributions of many species. We assessed the potential effects of climate change on an abundant and widely distributed group of diving birds, Eudyptes penguins, which are the main avian consumers in the Southern Ocean in terms of biomass consumption. Despite their abundance, several of these species have undergone population declines over the past century, potentially due to changing oceanography and prey availability over the important winter months. We used light-based geolocation tracking data for 485 individuals deployed between 2006 and 2020 across 10 of the major breeding locations for five taxa of Eudyptes penguins. We used boosted regression tree modelling to quantify post-moult habitat preference for southern rockhopper (E. chrysocome), eastern rockhopper (E. filholi), northern rockhopper (E. moseleyi) and macaroni/royal (E. chrysolophus and E. schlegeli) penguins. We then modelled their redistribution under two climate change scenarios, representative concentration pathways RCP4.5 and RCP8.5 (for the end of the century, 2071-2100). As climate forcings differ regionally, we quantified redistribution in the Atlantic, Central Indian, East Indian, West Pacific and East Pacific regions. We found sea surface temperature and sea surface height to be the most important predictors of current habitat for these penguins; physical features that are changing rapidly in the Southern Ocean. Our results indicated that the less severe RCP4.5 would lead to less habitat loss than the more severe RCP8.5. The five taxa of penguin may experience a general poleward redistribution of their preferred habitat, but with contrasting effects in the (i) change in total area of preferred habitat under climate change (ii) according to geographic region and (iii) the species (macaroni/royal vs. rockhopper populations). Our results provide further understanding on the regional impacts and vulnerability of species to climate change., (© 2022 The Authors. Global Change Biology published by John Wiley & Sons Ltd.) more...
- Published
- 2023
- Full Text
- View/download PDF
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