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7 results on '"Villegas-Amtmann S"'

1. Key questions in marine mammal bioenergetics

Author

McHuron, E.A., Adamczak, S., Arnould, J.P.Y., Ashe, E., Booth, C., Bowen, W.D., Christiansen, F., Chudzinska, M., Costa, D.P., Fahlman, A., Farmer, N.A., Fortune, S.M.E., Gallagher, C.A., Keen, K.A., Madsen, P.T., McMahon, C.R., Nabe-Nielsen, J., Noren, D.P., Noren, S.R., Pirotta, E., Rosen, D.A.S., Speakman, C.N., Villegas-Amtmann, S., Williams, R., Cooke, S., McHuron, E.A., Adamczak, S., Arnould, J.P.Y., Ashe, E., Booth, C., Bowen, W.D., Christiansen, F., Chudzinska, M., Costa, D.P., Fahlman, A., Farmer, N.A., Fortune, S.M.E., Gallagher, C.A., Keen, K.A., Madsen, P.T., McMahon, C.R., Nabe-Nielsen, J., Noren, D.P., Noren, S.R., Pirotta, E., Rosen, D.A.S., Speakman, C.N., Villegas-Amtmann, S., Williams, R., and Cooke, S.

Abstract

Bioenergetic approaches are increasingly used to understand how marine mammal populations could be affected by a changing and disturbed aquatic environment. There remain considerable gaps in our knowledge of marine mammal bioenergetics, which hinder the application of bioenergetic studies to inform policy decisions. We conducted a priority-setting exercise to identify high-priority unanswered questions in marine mammal bioenergetics, with an emphasis on questions relevant to conservation and management. Electronic communication and a virtual workshop were used to solicit and collate potential research questions from the marine mammal bioenergetic community. From a final list of 39 questions, 11 were identified as ‘key’ questions because they received votes from at least 50% of survey participants. Key questions included those related to energy intake (prey landscapes, exposure to human activities) and expenditure (field metabolic rate, exposure to human activities, lactation, time-activity budgets), energy allocation priorities, metrics of body condition and relationships with survival and reproductive success and extrapolation of data from one species to another. Existing tools to address key questions include labelled water, animal-borne sensors, mark-resight data from long-term research programs, environmental DNA and unmanned vehicles. Further validation of existing approaches and development of new methodologies are needed to comprehensively address some key questions, particularly for cetaceans. The identification of these key questions can provide a guiding framework to set research priorities, which ultimately may yield more accurate information to inform policies and better conserve marine mammal populations.

Published
2022

2. Influence of hunting strategy on foraging efficiency in Galapagos sea lions

Author

Blakeway, JA, Arnould, John, Hoskins, AJ, Martin Cabrera, P, Sutton, Grace, Huckstadt, LA, Costa, DP, Páez-Rosas, D, Villegas-Amtmann, S, Blakeway, JA, Arnould, John, Hoskins, AJ, Martin Cabrera, P, Sutton, Grace, Huckstadt, LA, Costa, DP, Páez-Rosas, D, and Villegas-Amtmann, S

Published
2021

5. Convergence of marine megafauna movement patterns in coastal and open oceans

Author

Sequeira, AMM, Rodríguez, JP, Eguíluz, VM, Harcourt, R, Hindell, M, Sims, DW, Duarte, CM, Costa, DP, Fernández-Gracia, J, Ferreira, LC, Hays, Graeme C, Heupel, MR, Meekan, MG, Aven, A, Bailleul, F, Baylis, AMM, Berumen, ML, Braun, CD, Burns, J, Caley, MJ, Campbell, R, Carmichael, RH, Clua, E, Einoder, LD, Friedlaender, A, Goebel, ME, Goldsworthy, SD, Guinet, C, Gunn, J, Hamer, D, Hammerschlag, N, Hammill, M, Hückstädt, LA, Humphries, NE, Lea, M-A, Lowther, A, Mackay, A, McHuron, E, McKenzie, J, McLeay, L, McMahon, CR, Mengersen, K, Muelbert, MMC, Pagano, AM, Page, B, Queiroz, N, Robinson, PW, Shaffer, SA, Shivji, M, Skomal, GB, Thorrold, SR, Villegas-Amtmann, S, Weise, M, Wells, R, Wetherbee, B, Wiebkin, A, Wienecke, B, Thums, M, Sequeira, AMM, Rodríguez, JP, Eguíluz, VM, Harcourt, R, Hindell, M, Sims, DW, Duarte, CM, Costa, DP, Fernández-Gracia, J, Ferreira, LC, Hays, Graeme C, Heupel, MR, Meekan, MG, Aven, A, Bailleul, F, Baylis, AMM, Berumen, ML, Braun, CD, Burns, J, Caley, MJ, Campbell, R, Carmichael, RH, Clua, E, Einoder, LD, Friedlaender, A, Goebel, ME, Goldsworthy, SD, Guinet, C, Gunn, J, Hamer, D, Hammerschlag, N, Hammill, M, Hückstädt, LA, Humphries, NE, Lea, M-A, Lowther, A, Mackay, A, McHuron, E, McKenzie, J, McLeay, L, McMahon, CR, Mengersen, K, Muelbert, MMC, Pagano, AM, Page, B, Queiroz, N, Robinson, PW, Shaffer, SA, Shivji, M, Skomal, GB, Thorrold, SR, Villegas-Amtmann, S, Weise, M, Wells, R, Wetherbee, B, Wiebkin, A, Wienecke, B, and Thums, M

Published
2018

6. Convergence of marine megafauna movement patterns in coastal and open oceans

Author

Sequeira, A. M.M., Rodríguez, J. P., Eguíluz, V. M., Harcourt, R., Hindell, M., Sims, D. W., Duarte, C. M., Costa, D. P., Fernández-Gracia, J., Ferreira, L. C., Hays, G. C., Heupel, M. R., Meekan, M. G., Aven, A., Bailleul, F., Baylis, A. M.M., Berumen, M. L., Braun, C. D., Burns, J., Caley, M. J., Campbell, R., Carmichael, R. H., Clua, E., Einoder, L. D., Friedlaender, Ari, Goebel, M. E., Goldsworthy, S. D., Guinet, C., Gunn, J., Hamer, D., Hammerschlag, N., Hammill, M., Hückstädt, L. A., Humphries, N. E., Lea, M. A., Lowther, A., Mackay, A., McHuron, E., McKenzie, J., McLeay, L., McMahon, C. R., Mengersen, K., Muelbert, M. M.C., Pagano, A. M., Page, B., Queiroz, N., Robinson, P. W., Shaffer, S. A., Shivji, M., Skomal, G. B., Thorrold, S. R., Villegas-Amtmann, S., Weise, M., Wells, R., Wetherbee, B., Wiebkin, A., Wienecke, B., Thums, M., Sequeira, A. M.M., Rodríguez, J. P., Eguíluz, V. M., Harcourt, R., Hindell, M., Sims, D. W., Duarte, C. M., Costa, D. P., Fernández-Gracia, J., Ferreira, L. C., Hays, G. C., Heupel, M. R., Meekan, M. G., Aven, A., Bailleul, F., Baylis, A. M.M., Berumen, M. L., Braun, C. D., Burns, J., Caley, M. J., Campbell, R., Carmichael, R. H., Clua, E., Einoder, L. D., Friedlaender, Ari, Goebel, M. E., Goldsworthy, S. D., Guinet, C., Gunn, J., Hamer, D., Hammerschlag, N., Hammill, M., Hückstädt, L. A., Humphries, N. E., Lea, M. A., Lowther, A., Mackay, A., McHuron, E., McKenzie, J., McLeay, L., McMahon, C. R., Mengersen, K., Muelbert, M. M.C., Pagano, A. M., Page, B., Queiroz, N., Robinson, P. W., Shaffer, S. A., Shivji, M., Skomal, G. B., Thorrold, S. R., Villegas-Amtmann, S., Weise, M., Wells, R., Wetherbee, B., Wiebkin, A., Wienecke, B., and Thums, M.

Abstract

The extent of increasing anthropogenic impacts on large marine vertebrates partly depends on the animals' movement patterns. Effective conservation requires identification of the key drivers of movement including intrinsic properties and extrinsic constraints associated with the dynamic nature of the environments the animals inhabit. However, the relative importance of intrinsic versus extrinsic factors remains elusive. We analyze a global dataset of ∼2.8 million locations from <2, 600 tracked individuals across 50 marine vertebrates evolutionarily separated by millions of years and using different locomotion modes (fly, swim, walk/paddle). Strikingly, movement patterns show a remarkable convergence, being strongly conserved across species and independent of body length and mass, despite these traits ranging over 10 orders of magnitude among the species studied. This represents a fundamental difference between marine and terrestrial vertebrates not previously identified, likely linked to the reduced costs of locomotion in water. Movement patterns were primarily explained by the interaction between species-specific traits and the habitat(s) they move through, resulting in complex movement patternswhenmoving close to coasts compared with more predictable patterns when moving in open oceans. This distinct difference may be associated with greater complexity within coastal microhabitats, highlighting a critical role of preferred habitat in shaping marine vertebrate global movements. Efforts to develop understanding of the characteristics of vertebrate movement should consider the habitat(s) through which they move to identify how movement patterns will alter with forecasted severe ocean changes, such as reduced Arctic sea ice cover, sea level rise, and declining oxygen content.

Published
2018

7. Convergence of marine megafauna movement patterns in coastal and open oceans.

Author

Sequeira, AMM, Sequeira, AMM, Rodríguez, JP, Eguíluz, VM, Harcourt, R, Hindell, M, Sims, DW, Duarte, CM, Costa, DP, Fernández-Gracia, J, Ferreira, LC, Hays, GC, Heupel, MR, Meekan, MG, Aven, A, Bailleul, F, Baylis, AMM, Berumen, ML, Braun, CD, Burns, J, Caley, MJ, Campbell, R, Carmichael, RH, Clua, E, Einoder, LD, Friedlaender, Ari, Goebel, ME, Goldsworthy, SD, Guinet, C, Gunn, J, Hamer, D, Hammerschlag, N, Hammill, M, Hückstädt, LA, Humphries, NE, Lea, M-A, Lowther, A, Mackay, A, McHuron, E, McKenzie, J, McLeay, L, McMahon, CR, Mengersen, K, Muelbert, MMC, Pagano, AM, Page, B, Queiroz, N, Robinson, PW, Shaffer, SA, Shivji, M, Skomal, GB, Thorrold, SR, Villegas-Amtmann, S, Weise, M, Wells, R, Wetherbee, B, Wiebkin, A, Wienecke, B, Thums, M, Sequeira, AMM, Sequeira, AMM, Rodríguez, JP, Eguíluz, VM, Harcourt, R, Hindell, M, Sims, DW, Duarte, CM, Costa, DP, Fernández-Gracia, J, Ferreira, LC, Hays, GC, Heupel, MR, Meekan, MG, Aven, A, Bailleul, F, Baylis, AMM, Berumen, ML, Braun, CD, Burns, J, Caley, MJ, Campbell, R, Carmichael, RH, Clua, E, Einoder, LD, Friedlaender, Ari, Goebel, ME, Goldsworthy, SD, Guinet, C, Gunn, J, Hamer, D, Hammerschlag, N, Hammill, M, Hückstädt, LA, Humphries, NE, Lea, M-A, Lowther, A, Mackay, A, McHuron, E, McKenzie, J, McLeay, L, McMahon, CR, Mengersen, K, Muelbert, MMC, Pagano, AM, Page, B, Queiroz, N, Robinson, PW, Shaffer, SA, Shivji, M, Skomal, GB, Thorrold, SR, Villegas-Amtmann, S, Weise, M, Wells, R, Wetherbee, B, Wiebkin, A, Wienecke, B, and Thums, M

Abstract

The extent of increasing anthropogenic impacts on large marine vertebrates partly depends on the animals' movement patterns. Effective conservation requires identification of the key drivers of movement including intrinsic properties and extrinsic constraints associated with the dynamic nature of the environments the animals inhabit. However, the relative importance of intrinsic versus extrinsic factors remains elusive. We analyze a global dataset of ∼2.8 million locations from >2,600 tracked individuals across 50 marine vertebrates evolutionarily separated by millions of years and using different locomotion modes (fly, swim, walk/paddle). Strikingly, movement patterns show a remarkable convergence, being strongly conserved across species and independent of body length and mass, despite these traits ranging over 10 orders of magnitude among the species studied. This represents a fundamental difference between marine and terrestrial vertebrates not previously identified, likely linked to the reduced costs of locomotion in water. Movement patterns were primarily explained by the interaction between species-specific traits and the habitat(s) they move through, resulting in complex movement patterns when moving close to coasts compared with more predictable patterns when moving in open oceans. This distinct difference may be associated with greater complexity within coastal microhabitats, highlighting a critical role of preferred habitat in shaping marine vertebrate global movements. Efforts to develop understanding of the characteristics of vertebrate movement should consider the habitat(s) through which they move to identify how movement patterns will alter with forecasted severe ocean changes, such as reduced Arctic sea ice cover, sea level rise, and declining oxygen content.

Published
2018

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