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3. The Chagos Archipelago

Author

Andradi-Brown, Dominic A., Dinesen, Zena, Head, Catherine E. I., Tickler, David M., Rowlands, Gwilym, Rogers, Alex D., Riegl, Bernhard M., Series Editor, Dodge, Richard E., Series Editor, Loya, Yossi, editor, Puglise, Kimberly A., editor, and Bridge, Tom C.L., editor

Published
2019
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5. A review of a decade of lessons from one of the world’s largest MPAs: conservation gains and key challenges

Author

Hays, Graeme C., Koldewey, Heather J., Andrzejaczek, Samantha, Attrill, Martin J., Barley, Shanta, Bayley, Daniel T. I., Benkwitt, Cassandra E., Block, Barbara, Schallert, Robert J., Carlisle, Aaron B., Carr, Pete, Chapple, Taylor K., Collins, Claire, Diaz, Clara, Dunn, Nicholas, Dunbar, Robert B., Eager, Dannielle S., Engel, Julian, Embling, Clare B., Esteban, Nicole, Ferretti, Francesco, Foster, Nicola L., Freeman, Robin, Gollock, Matthew, Graham, Nicholas A. J., Harris, Joanna L., Head, Catherine E. I., Hosegood, Phil, Howell, Kerry L., Hussey, Nigel E., Jacoby, David M. P., Jones, Rachel, Sannassy Pilly, Sivajyodee, Lange, Ines D., Letessier, Tom B., Levy, Emma, Lindhart, Mathilde, McDevitt-Irwin, Jamie M., Meekan, Mark, Meeuwig, Jessica J., Micheli, Fiorenza, Mogg, Andrew O. M., Mortimer, Jeanne A., Mucciarone, David A., Nicoll, Malcolm A., Nuno, Ana, Perry, Chris T., Preston, Stephen G., Rattray, Alex J., Robinson, Edward, Roche, Ronan C., Schiele, Melissa, Sheehan, Emma V., Sheppard, Anne, Sheppard, Charles, Smith, Adrian L., Soule, Bradley, Spalding, Mark, Stevens, Guy M. W., Steyaert, Margaux, Stiffel, Sarah, Taylor, Brett M., Tickler, David, Trevail, Alice M., Trueba, Pablo, Turner, John, Votier, Stephen, Wilson, Bry, Williams, Gareth J., Williamson, Benjamin J., Williamson, Michael J., Wood, Hannah, and Curnick, David J.

Published
2020
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7. Modern slavery and the race to fish

Author

Tickler, David, Meeuwig, Jessica J., Bryant, Katharine, David, Fiona, Forrest, John A. H., Gordon, Elise, Larsen, Jacqueline Joudo, Oh, Beverly, Pauly, Daniel, Sumaila, Ussif R., and Zeller, Dirk

Published
2018
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8. Diving into the vertical dimension of elasmobranch movement ecology

Author

Andrzejaczek, Samantha, primary, Lucas, Tim C.D., additional, Goodman, Maurice C., additional, Hussey, Nigel E., additional, Armstrong, Amelia J., additional, Carlisle, Aaron, additional, Coffey, Daniel M., additional, Gleiss, Adrian C., additional, Huveneers, Charlie, additional, Jacoby, David M. P., additional, Meekan, Mark G., additional, Mourier, Johann, additional, Peel, Lauren R., additional, Abrantes, Kátya, additional, Afonso, André S., additional, Ajemian, Matthew J., additional, Anderson, Brooke N., additional, Anderson, Scot D., additional, Araujo, Gonzalo, additional, Armstrong, Asia O., additional, Bach, Pascal, additional, Barnett, Adam, additional, Bennett, Mike B., additional, Bezerra, Natalia A., additional, Bonfil, Ramon, additional, Boustany, Andre M., additional, Bowlby, Heather D., additional, Branco, Ilka, additional, Braun, Camrin D., additional, Brooks, Edward J., additional, Brown, Judith, additional, Burke, Patrick J., additional, Butcher, Paul, additional, Castleton, Michael, additional, Chapple, Taylor K., additional, Chateau, Olivier, additional, Clarke, Maurice, additional, Coelho, Rui, additional, Cortes, Enric, additional, Couturier, Lydie I. E., additional, Cowley, Paul D., additional, Croll, Donald A., additional, Cuevas, Juan M., additional, Curtis, Tobey H., additional, Dagorn, Laurent, additional, Dale, Jonathan J., additional, Daly, Ryan, additional, Dewar, Heidi, additional, Doherty, Philip D., additional, Domingo, Andrés, additional, Dove, Alistair D. M., additional, Drew, Michael, additional, Dudgeon, Christine L., additional, Duffy, Clinton A. J., additional, Elliott, Riley G., additional, Ellis, Jim R., additional, Erdmann, Mark V., additional, Farrugia, Thomas J., additional, Ferreira, Luciana C., additional, Ferretti, Francesco, additional, Filmalter, John D., additional, Finucci, Brittany, additional, Fischer, Chris, additional, Fitzpatrick, Richard, additional, Forget, Fabien, additional, Forsberg, Kerstin, additional, Francis, Malcolm P., additional, Franks, Bryan R., additional, Gallagher, Austin J., additional, Galvan-Magana, Felipe, additional, García, Mirta L., additional, Gaston, Troy F., additional, Gillanders, Bronwyn M., additional, Gollock, Matthew J., additional, Green, Jonathan R., additional, Green, Sofia, additional, Griffiths, Christopher A., additional, Hammerschlag, Neil, additional, Hasan, Abdi, additional, Hawkes, Lucy A., additional, Hazin, Fabio, additional, Heard, Matthew, additional, Hearn, Alex, additional, Hedges, Kevin J., additional, Henderson, Suzanne M., additional, Holdsworth, John, additional, Holland, Kim N., additional, Howey, Lucy A., additional, Hueter, Robert E., additional, Humphries, Nicholas E., additional, Hutchinson, Melanie, additional, Jaine, Fabrice R. A., additional, Jorgensen, Salvador J., additional, Kanive, Paul E., additional, Labaja, Jessica, additional, Lana, Fernanda O., additional, Lassauce, Hugo, additional, Lipscombe, Rebecca S., additional, Llewellyn, Fiona, additional, Macena, Bruno C. L., additional, Mambrasar, Ronald, additional, McAllister, Jaime D., additional, McCully Phillips, Sophy R., additional, McGregor, Frazer, additional, McMillan, Matthew N., additional, McNaughton, Lianne M., additional, Mendonça, Sibele A., additional, Meyer, Carl G., additional, Meyers, Megan, additional, Mohan, John A., additional, Montgomery, John C., additional, Mucientes, Gonzalo, additional, Musyl, Michael K., additional, Nasby-Lucas, Nicole, additional, Natanson, Lisa J., additional, O’Sullivan, John B., additional, Oliveira, Paulo, additional, Papastamtiou, Yannis P., additional, Patterson, Toby A., additional, Pierce, Simon J., additional, Queiroz, Nuno, additional, Radford, Craig A., additional, Richardson, Andy J., additional, Richardson, Anthony J., additional, Righton, David, additional, Rohner, Christoph A., additional, Royer, Mark A., additional, Saunders, Ryan A., additional, Schaber, Matthias, additional, Schallert, Robert J., additional, Scholl, Michael C., additional, Seitz, Andrew C., additional, Semmens, Jayson M., additional, Setyawan, Edy, additional, Shea, Brendan D., additional, Shidqi, Rafid A., additional, Shillinger, George L., additional, Shipley, Oliver N., additional, Shivji, Mahmood S., additional, Sianipar, Abraham B., additional, Silva, Joana F., additional, Sims, David W., additional, Skomal, Gregory B., additional, Sousa, Lara L., additional, Southall, Emily J., additional, Spaet, Julia L. Y., additional, Stehfest, Kilian M., additional, Stevens, Guy, additional, Stewart, Joshua D., additional, Sulikowski, James A., additional, Syakurachman, Ismail, additional, Thorrold, Simon R., additional, Thums, Michele, additional, Tickler, David, additional, Tolloti, Mariana T., additional, Townsend, Kathy A., additional, Travassos, Paulo, additional, Tyminski, John P., additional, Vaudo, Jeremy J., additional, Veras, Drausio, additional, Wantiez, Laurent, additional, Weber, Sam B., additional, Wells, R.J. David, additional, Weng, Kevin C., additional, Wetherbee, Bradley M., additional, Williamson, Jane E., additional, Witt, Matthew J., additional, Wright, Serena, additional, Zilliacus, Kelly, additional, Block, Barbara A., additional, and Curnick, David J., additional

Published
2022
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9. Diving into the vertical dimension of elasmobranch movement ecology

Author

Andrzejaczek, Samantha, Lucas, Tim C.D., Goodman, Maurice C., Hussey, Nigel E., Armstrong, Amelia J., Carlisle, Aaron, Coffey, Daniel M., Gleiss, Adrian C., Huveneers, Charlie, Jacoby, David M. P., Meekan, Mark G., Mourier, Johann, Peel, Lauren R., Abrantes, Kátya, Afonso, André S., Ajemian, Matthew J., Anderson, Brooke N., Anderson, Scot D., Araujo, Gonzalo, Armstrong, Asia O., Bach, Pascal, Barnett, Adam, Bennett, Mike B., Bezerra, Natalia A., Bonfil, Ramon, Boustany, Andre M., Bowlby, Heather D., Branco, Ilka, Braun, Camrin D., Brooks, Edward J., Brown, Judith, Burke, Patrick J., Butcher, Paul A., Castleton, Michael, Chapple, Taylor K., Chateau, Olivier, Clarke, Maurice, Coelho, Rui, Cortes, Enric, Couturier, Lydie I. E., Cowley, Paul D., Croll, Donald A., Cuevas, Juan M., Curtis, Tobey H., Dagorn, Laurent, Dale, Jonathan J., Daly, Ryan, Dewar, Heidi, Doherty, Philip D., Domingo, Andrés, Dove, Alistair D. M., Drew, Michael, Dudgeon, Christine L., Duffy, Clinton A. J., Elliott, Riley G., Ellis, Jim R., Erdmann, Mark V., Farrugia, Thomas J., Ferreira, Luciana C., Ferretti, Francesco, Filmalter, John D., Finucci, Brittany, Fischer, Chris, Fitzpatrick, Richard, Forget, Fabien, Forsberg, Kerstin, Francis, Malcolm P., Franks, Bryan R., Gallagher, Austin J., Galvan-Magana, Felipe, García, Mirta L., Gaston, Troy F., Gillanders, Bronwyn M., Gollock, Matthew J., Green, Jonathan R., Green, Sofia, Griffiths, Christopher A., Hammerschlag, Neil, Hasan, Abdi, Hawkes, Lucy A., Hazin, Fabio, Heard, Matthew, Hearn, Alex, Hedges, Kevin J., Henderson, Suzanne M., Holdsworth, John, Holland, Kim N., Howey, Lucy A., Hueter, Robert E., Humphries, Nicholas E., Hutchinson, Melanie, Jaine, Fabrice R. A., Jorgensen, Salvador J., Kanive, Paul E., Labaja, Jessica, Lana, Fernanda O., Lassauce, Hugo, Lipscombe, Rebecca S., Llewellyn, Fiona, Macena, Bruno C. L., Mambrasar, Ronald, McAllister, Jaime D., McCully Phillips, Sophy R., McGregor, Frazer, McMillan, Matthew N., McNaughton, Lianne M., Mendonça, Sibele A., Meyer, Carl G., Meyers, Megan, Mohan, John A., Montgomery, John C., Mucientes, Gonzalo, Musyl, Michael K., Nasby-Lucas, Nicole, Natanson, Lisa J., O’Sullivan, John B., Oliveira, Paulo, Papastamtiou, Yannis P., Patterson, Toby A., Pierce, Simon J., Queiroz, Nuno, Radford, Craig A., Richardson, Andy J., Richardson, Anthony J., Righton, David, Rohner, Christoph A., Royer, Mark A., Saunders, Ryan A., Schaber, Matthias, Schallert, Robert J., Scholl, Michael C., Seitz, Andrew C., Semmens, Jayson M., Setyawan, Edy, Shea, Brendan D., Shidqi, Rafid A., Shillinger, George L., Shipley, Oliver N., Shivji, Mahmood S., Sianipar, Abraham B., Silva, Joana F., Sims, David W., Skomal, Gregory B., Sousa, Lara L., Southall, Emily J., Spaet, Julia L. Y., Stehfest, Kilian M., Stevens, Guy, Stewart, Joshua D., Sulikowski, James A., Syakurachman, Ismail, Thorrold, Simon R., Thums, Michele, Tickler, David, Tolloti, Mariana T., Townsend, Kathy A., Travassos, Paulo, Tyminski, John P., Vaudo, Jeremy J., Veras, Drausio, Wantiez, Laurent, Weber, Sam B., Wells, R.J. David, Weng, Kevin C., Wetherbee, Bradley M., Williamson, Jane E., Witt, Matthew J., Wright, Serena, Zilliacus, Kelly, Block, Barbara A., Curnick, David J., Andrzejaczek, Samantha, Lucas, Tim C.D., Goodman, Maurice C., Hussey, Nigel E., Armstrong, Amelia J., Carlisle, Aaron, Coffey, Daniel M., Gleiss, Adrian C., Huveneers, Charlie, Jacoby, David M. P., Meekan, Mark G., Mourier, Johann, Peel, Lauren R., Abrantes, Kátya, Afonso, André S., Ajemian, Matthew J., Anderson, Brooke N., Anderson, Scot D., Araujo, Gonzalo, Armstrong, Asia O., Bach, Pascal, Barnett, Adam, Bennett, Mike B., Bezerra, Natalia A., Bonfil, Ramon, Boustany, Andre M., Bowlby, Heather D., Branco, Ilka, Braun, Camrin D., Brooks, Edward J., Brown, Judith, Burke, Patrick J., Butcher, Paul A., Castleton, Michael, Chapple, Taylor K., Chateau, Olivier, Clarke, Maurice, Coelho, Rui, Cortes, Enric, Couturier, Lydie I. E., Cowley, Paul D., Croll, Donald A., Cuevas, Juan M., Curtis, Tobey H., Dagorn, Laurent, Dale, Jonathan J., Daly, Ryan, Dewar, Heidi, Doherty, Philip D., Domingo, Andrés, Dove, Alistair D. M., Drew, Michael, Dudgeon, Christine L., Duffy, Clinton A. J., Elliott, Riley G., Ellis, Jim R., Erdmann, Mark V., Farrugia, Thomas J., Ferreira, Luciana C., Ferretti, Francesco, Filmalter, John D., Finucci, Brittany, Fischer, Chris, Fitzpatrick, Richard, Forget, Fabien, Forsberg, Kerstin, Francis, Malcolm P., Franks, Bryan R., Gallagher, Austin J., Galvan-Magana, Felipe, García, Mirta L., Gaston, Troy F., Gillanders, Bronwyn M., Gollock, Matthew J., Green, Jonathan R., Green, Sofia, Griffiths, Christopher A., Hammerschlag, Neil, Hasan, Abdi, Hawkes, Lucy A., Hazin, Fabio, Heard, Matthew, Hearn, Alex, Hedges, Kevin J., Henderson, Suzanne M., Holdsworth, John, Holland, Kim N., Howey, Lucy A., Hueter, Robert E., Humphries, Nicholas E., Hutchinson, Melanie, Jaine, Fabrice R. A., Jorgensen, Salvador J., Kanive, Paul E., Labaja, Jessica, Lana, Fernanda O., Lassauce, Hugo, Lipscombe, Rebecca S., Llewellyn, Fiona, Macena, Bruno C. L., Mambrasar, Ronald, McAllister, Jaime D., McCully Phillips, Sophy R., McGregor, Frazer, McMillan, Matthew N., McNaughton, Lianne M., Mendonça, Sibele A., Meyer, Carl G., Meyers, Megan, Mohan, John A., Montgomery, John C., Mucientes, Gonzalo, Musyl, Michael K., Nasby-Lucas, Nicole, Natanson, Lisa J., O’Sullivan, John B., Oliveira, Paulo, Papastamtiou, Yannis P., Patterson, Toby A., Pierce, Simon J., Queiroz, Nuno, Radford, Craig A., Richardson, Andy J., Richardson, Anthony J., Righton, David, Rohner, Christoph A., Royer, Mark A., Saunders, Ryan A., Schaber, Matthias, Schallert, Robert J., Scholl, Michael C., Seitz, Andrew C., Semmens, Jayson M., Setyawan, Edy, Shea, Brendan D., Shidqi, Rafid A., Shillinger, George L., Shipley, Oliver N., Shivji, Mahmood S., Sianipar, Abraham B., Silva, Joana F., Sims, David W., Skomal, Gregory B., Sousa, Lara L., Southall, Emily J., Spaet, Julia L. Y., Stehfest, Kilian M., Stevens, Guy, Stewart, Joshua D., Sulikowski, James A., Syakurachman, Ismail, Thorrold, Simon R., Thums, Michele, Tickler, David, Tolloti, Mariana T., Townsend, Kathy A., Travassos, Paulo, Tyminski, John P., Vaudo, Jeremy J., Veras, Drausio, Wantiez, Laurent, Weber, Sam B., Wells, R.J. David, Weng, Kevin C., Wetherbee, Bradley M., Williamson, Jane E., Witt, Matthew J., Wright, Serena, Zilliacus, Kelly, Block, Barbara A., and Curnick, David J.

Abstract

Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understand their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on horizontal movements. Our study addresses the knowledge gap of vertical movements by compiling the first global synthesis of vertical habitat use by elasmobranchs from data obtained by deployment of 989 biotelemetry tags on 38 elasmobranch species. Elasmobranchs displayed high intra- and interspecific variability in vertical movement patterns. Substantial vertical overlap was observed for many epipelagic elasmobranchs, indicating an increased likelihood to display spatial overlap, biologically interact, and share similar risk to anthropogenic threats that vary on a vertical gradient. We highlight the critical next steps toward incorporating vertical movement into global management and monitoring strategies for elasmobranchs, emphasizing the need to address geographic and taxonomic biases in deployments and to concurrently consider both horizontal and vertical movements. Vertical habitat use by sharks, rays, and skates varies globally and has implications for their conservation and management.

Published
2022

11. Analysing detection gaps in acoustic telemetry data to infer differential movement patterns in fish

Author

Williamson, Michael J., Tebbs, Emma J., Dawson, Terence P., Curnick, David J., Ferretti, Francesco, Carlisle, Aaron B., Chapple, Taylor K., Schallert, Robert J., Tickler, David M., Harrison, Xavier A., Block, Barbara A., Jacoby, David M. P., Williamson, Michael J., Tebbs, Emma J., Dawson, Terence P., Curnick, David J., Ferretti, Francesco, Carlisle, Aaron B., Chapple, Taylor K., Schallert, Robert J., Tickler, David M., Harrison, Xavier A., Block, Barbara A., and Jacoby, David M. P.

Abstract

A wide array of technologies are available for gaining insight into the movement of wild aquatic animals. Although acoustic telemetry can lack the fine-scale spatial resolution of some satellite tracking technologies, the substantially longer battery life can yield important long-term data on individual behavior and movement for low per-unit cost. Typically, however, receiver arrays are designed to maximize spatial coverage at the cost of positional accuracy leading to potentially longer detection gaps as individuals move out of range between monitored locations. This is particularly true when these technologies are deployed to monitor species in hard-to-access locations. Here, we develop a novel approach to analyzing acoustic telemetry data, using the timing and duration of gaps between animal detections to infer different behaviors. Using the durations between detections at the same and different receiver locations (i.e., detection gaps), we classify behaviors into "restricted" or potential wider "out-of-range" movements synonymous with longer distance dispersal. We apply this method to investigate spatial and temporal segregation of inferred movement patterns in two sympatric species of reef shark within a large, remote, marine protected area (MPA). Response variables were generated using network analysis, and drivers of these movements were identified using generalized linear mixed models and multimodel inference. Species, diel period, and season were significant predictors of "out-of-range" movements. Silvertip sharks were overall more likely to undertake "out-of-range" movements, compared with gray reef sharks, indicating spatial segregation, and corroborating previous stable isotope work between these two species. High individual variability in "out-of-range" movements in both species was also identified. We present a novel gap analysis of telemetry data to help infer differential movement and space use patterns where acoustic coverage is imperfect and other

Published
2021
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12. Analysing detection gaps in acoustic telemetry data to infer differential movement patterns in fish

Author

Fish and Wildlife Conservation, Williamson, Michael J., Tebbs, Emma J., Dawson, Terence P., Curnick, David J., Ferretti, Francesco, Carlisle, Aaron B., Chapple, Taylor K., Schallert, Robert J., Tickler, David M., Harrison, Xavier A., Block, Barbara A., Jacoby, David M. P., Fish and Wildlife Conservation, Williamson, Michael J., Tebbs, Emma J., Dawson, Terence P., Curnick, David J., Ferretti, Francesco, Carlisle, Aaron B., Chapple, Taylor K., Schallert, Robert J., Tickler, David M., Harrison, Xavier A., Block, Barbara A., and Jacoby, David M. P.

Abstract

A wide array of technologies are available for gaining insight into the movement of wild aquatic animals. Although acoustic telemetry can lack the fine-scale spatial resolution of some satellite tracking technologies, the substantially longer battery life can yield important long-term data on individual behavior and movement for low per-unit cost. Typically, however, receiver arrays are designed to maximize spatial coverage at the cost of positional accuracy leading to potentially longer detection gaps as individuals move out of range between monitored locations. This is particularly true when these technologies are deployed to monitor species in hard-to-access locations. Here, we develop a novel approach to analyzing acoustic telemetry data, using the timing and duration of gaps between animal detections to infer different behaviors. Using the durations between detections at the same and different receiver locations (i.e., detection gaps), we classify behaviors into "restricted" or potential wider "out-of-range" movements synonymous with longer distance dispersal. We apply this method to investigate spatial and temporal segregation of inferred movement patterns in two sympatric species of reef shark within a large, remote, marine protected area (MPA). Response variables were generated using network analysis, and drivers of these movements were identified using generalized linear mixed models and multimodel inference. Species, diel period, and season were significant predictors of "out-of-range" movements. Silvertip sharks were overall more likely to undertake "out-of-range" movements, compared with gray reef sharks, indicating spatial segregation, and corroborating previous stable isotope work between these two species. High individual variability in "out-of-range" movements in both species was also identified. We present a novel gap analysis of telemetry data to help infer differential movement and space use patterns where acoustic coverage is imperfect and other

Published
2021

13. Shark movement strategies influence poaching risk and can guide enforcement decisions in a large, remote marine protected area

Author

Jacoby, David M. P., Ferretti, Francesco, Freeman, Robin, Carlisle, Aaron B., Chapple, Taylor K., Curnick, David J., Dale, Jonathan J., Schallert, Robert J., Tickler, David, Block, Barbara A., Jacoby, David M. P., Ferretti, Francesco, Freeman, Robin, Carlisle, Aaron B., Chapple, Taylor K., Curnick, David J., Dale, Jonathan J., Schallert, Robert J., Tickler, David, and Block, Barbara A.

Abstract

Large, remote marine protected areas (MPAs) containing both reef and pelagic habitats, have been shown to offer considerable refuge to populations of reef‐associated sharks. Many large MPAs are, however, impacted by illegal fishing activity conducted by unlicensed vessels. While enforcement of these reserves is often expensive, it would likely benefit from the integration of ecological data on the mobile animals they are designed to protect. Consequently, shark populations in some protected areas continue to decline, as they remain a prime target for illegal fishers. To understand shark movements and their vulnerability to illegal fishing, 3 years of acoustic tracking data, from 101 reef‐associated sharks, were analysed as movement networks to explore the predictability of movement patterns and identify key movement corridors within the British Indian Ocean Territory (BIOT) MPA. We examined how space use and connectivity overlap with spatially explicit risk of illegal fishing, through data obtained from the management consultancy enforcing the MPA. Using individual‐based models, the movement networks of two sympatric shark species were efficiently predicted with distance‐decay functions (>95% movements accurately predicted). Model outliers were used to highlight the locations with unexpectedly high movement rates where MPA enforcement patrols might most efficiently mitigate predator removal. Activity space estimates and network metrics illustrate that silvertip sharks were more dynamic, less resident and link larger components of the MPA than grey reef sharks. However, we show that this behaviour potentially enhances their exposure to illegal fishing activity. Synthesis and applications. Marine protected area (MPA) enforcement strategies are often limited by resources. The British Indian Ocean Territory MPA, one of the world's largest ‘no take’ MPAs, has a single patrol vessel to enforce 640,000 km2 of open ocean, atoll and reef ecosystems. We argue that to optimize

Published
2020
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14. Shark movement strategies influence poaching risk and can guide enforcement decisions in a large, remote marine protected area

Author

Russell, Debbie, Jacoby, David M. P., Ferretti, Francesco, Freeman, Robin, Carlisle, Aaron B., Chapple, Taylor K., Curnick, David J., Dale, Jonathan J., Schallert, Robert J., Tickler, David, Block, Barbara A., Russell, Debbie, Jacoby, David M. P., Ferretti, Francesco, Freeman, Robin, Carlisle, Aaron B., Chapple, Taylor K., Curnick, David J., Dale, Jonathan J., Schallert, Robert J., Tickler, David, and Block, Barbara A.

Abstract

Large, remote marine protected areas (MPAs) containing both reef and pelagic habitats, have been shown to offer considerable refuge to populations of reef-associated sharks. Many large MPAs are, however, impacted by illegal fishing activity conducted by unlicensed vessels. While enforcement of these reserves is often expensive, it would likely benefit from the integration of ecological data on the mobile animals they are designed to protect. Consequently, shark populations in some protected areas continue to decline, as they remain a prime target for illegal fishers. To understand shark movements and their vulnerability to illegal fishing, 3 years of acoustic tracking data, from 101 reef-associated sharks, were analysed as movement networks to explore the predictability of movement patterns and identify key movement corridors within the British Indian Ocean Territory (BIOT) MPA. We examined how space use and connectivity overlap with spatially explicit risk of illegal fishing, through data obtained from the management consultancy enforcing the MPA. Using individual-based models, the movement networks of two sympatric shark species were efficiently predicted with distance-decay functions (>95% movements accurately predicted). Model outliers were used to highlight the locations with unexpectedly high movement rates where MPA enforcement patrols might most efficiently mitigate predator removal. Activity space estimates and network metrics illustrate that silvertip sharks were more dynamic, less resident and link larger components of the MPA than grey reef sharks. However, we show that this behaviour potentially enhances their exposure to illegal fishing activity. Synthesis and applications. Marine protected area (MPA) enforcement strategies are often limited by resources. The British Indian Ocean Territory MPA, one of the world's largest ‘no take’ MPAs, has a single patrol vessel to enforce 640,000 km2 of open ocean, atoll and reef ecosystems. We argue that to optimize

Published
2020

15. Analysing detection gaps in acoustic telemetry data to infer differential movement patterns in fish

Author

Williamson, Michael J., primary, Tebbs, Emma J., additional, Dawson, Terence P., additional, Curnick, David J., additional, Ferretti, Francesco, additional, Carlisle, Aaron B., additional, Chapple, Taylor K., additional, Schallert, Robert J., additional, Tickler, David M., additional, Harrison, Xavier A., additional, Block, Barbara A., additional, and Jacoby, David M.P., additional

Published
2021
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17. Gap analysis of acoustic tracking data reveals spatial and temporal segregation in sympatric reef sharks

Author

Williamson, Michael J., primary, Tebbs, Emma J, additional, Dawson, Terrence P, additional, Curnick, David J, additional, Ferretti, Francesco, additional, Carlisle, Aaron B, additional, Chapple, Taylor K, additional, Schallert, Robert J, additional, Tickler, David M, additional, Block, Barbara A, additional, and Jacoby, David MP, additional

Published
2020
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27. Diving into the vertical dimension of elasmobranch movement ecology

Author

Samantha Andrzejaczek, Tim C.D. Lucas, Maurice C. Goodman, Nigel E. Hussey, Amelia J. Armstrong, Aaron Carlisle, Daniel M. Coffey, Adrian C. Gleiss, Charlie Huveneers, David M. P. Jacoby, Mark G. Meekan, Johann Mourier, Lauren R. Peel, Kátya Abrantes, André S. Afonso, Matthew J. Ajemian, Brooke N. Anderson, Scot D. Anderson, Gonzalo Araujo, Asia O. Armstrong, Pascal Bach, Adam Barnett, Mike B. Bennett, Natalia A. Bezerra, Ramon Bonfil, Andre M. Boustany, Heather D. Bowlby, Ilka Branco, Camrin D. Braun, Edward J. Brooks, Judith Brown, Patrick J. Burke, Paul Butcher, Michael Castleton, Taylor K. Chapple, Olivier Chateau, Maurice Clarke, Rui Coelho, Enric Cortes, Lydie I. E. Couturier, Paul D. Cowley, Donald A. Croll, Juan M. Cuevas, Tobey H. Curtis, Laurent Dagorn, Jonathan J. Dale, Ryan Daly, Heidi Dewar, Philip D. Doherty, Andrés Domingo, Alistair D. M. Dove, Michael Drew, Christine L. Dudgeon, Clinton A. J. Duffy, Riley G. Elliott, Jim R. Ellis, Mark V. Erdmann, Thomas J. Farrugia, Luciana C. Ferreira, Francesco Ferretti, John D. Filmalter, Brittany Finucci, Chris Fischer, Richard Fitzpatrick, Fabien Forget, Kerstin Forsberg, Malcolm P. Francis, Bryan R. Franks, Austin J. Gallagher, Felipe Galvan-Magana, Mirta L. García, Troy F. Gaston, Bronwyn M. Gillanders, Matthew J. Gollock, Jonathan R. Green, Sofia Green, Christopher A. Griffiths, Neil Hammerschlag, Abdi Hasan, Lucy A. Hawkes, Fabio Hazin, Matthew Heard, Alex Hearn, Kevin J. Hedges, Suzanne M. Henderson, John Holdsworth, Kim N. Holland, Lucy A. Howey, Robert E. Hueter, Nicholas E. Humphries, Melanie Hutchinson, Fabrice R. A. Jaine, Salvador J. Jorgensen, Paul E. Kanive, Jessica Labaja, Fernanda O. Lana, Hugo Lassauce, Rebecca S. Lipscombe, Fiona Llewellyn, Bruno C. L. Macena, Ronald Mambrasar, Jaime D. McAllister, Sophy R. McCully Phillips, Frazer McGregor, Matthew N. McMillan, Lianne M. McNaughton, Sibele A. Mendonça, Carl G. Meyer, Megan Meyers, John A. Mohan, John C. Montgomery, Gonzalo Mucientes, Michael K. Musyl, Nicole Nasby-Lucas, Lisa J. Natanson, John B. O’Sullivan, Paulo Oliveira, Yannis P. Papastamtiou, Toby A. Patterson, Simon J. Pierce, Nuno Queiroz, Craig A. Radford, Andy J. Richardson, Anthony J. Richardson, David Righton, Christoph A. Rohner, Mark A. Royer, Ryan A. Saunders, Matthias Schaber, Robert J. Schallert, Michael C. Scholl, Andrew C. Seitz, Jayson M. Semmens, Edy Setyawan, Brendan D. Shea, Rafid A. Shidqi, George L. Shillinger, Oliver N. Shipley, Mahmood S. Shivji, Abraham B. Sianipar, Joana F. Silva, David W. Sims, Gregory B. Skomal, Lara L. Sousa, Emily J. Southall, Julia L. Y. Spaet, Kilian M. Stehfest, Guy Stevens, Joshua D. Stewart, James A. Sulikowski, Ismail Syakurachman, Simon R. Thorrold, Michele Thums, David Tickler, Mariana T. Tolloti, Kathy A. Townsend, Paulo Travassos, John P. Tyminski, Jeremy J. Vaudo, Drausio Veras, Laurent Wantiez, Sam B. Weber, R.J. David Wells, Kevin C. Weng, Bradley M. Wetherbee, Jane E. 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Fernanda O [0000-0001-7235-069X], Lassauce, Hugo [0000-0001-9636-6522], Lipscombe, Rebecca S [0000-0001-9602-643X], Llewellyn, Fiona [0000-0003-4309-8311], Macena, Bruno CL [0000-0001-5010-8560], McCully Phillips, Sophy R [0000-0003-3110-5916], McGregor, Frazer [0000-0002-7441-4404], McMillan, Matthew N [0000-0001-6348-184X], Mendonça, Sibele A [0000-0002-1981-5950], Mohan, John A [0000-0002-2758-163X], Mucientes, Gonzalo [0000-0001-6650-3020], Musyl, Michael K [0000-0003-4719-9259], Nasby-Lucas, Nicole [0000-0001-8355-9392], Natanson, Lisa J [0000-0002-2903-6037], O'Sullivan, John B [0000-0002-1689-2141], Oliveira, Paulo [0000-0001-7697-2111], Papastamtiou, Yannis P [0000-0002-6091-6841], Patterson, Toby A [0000-0002-7150-9205], Pierce, Simon J [0000-0002-9375-5175], Queiroz, Nuno [0000-0002-3860-7356], Radford, Craig A [0000-0001-7949-9497], Richardson, Andy J [0000-0003-2598-5080], Richardson, Anthony J [0000-0002-9289-7366], Righton, David [0000-0001-8643-3672], Rohner, Christoph A [0000-0001-8760-8972], Royer, Mark A [0000-0002-6938-7536], Schaber, Matthias [0000-0003-1032-4626], Schallert, Robert J [0000-0002-3584-2668], Scholl, Michael C [0000-0002-6014-1759], Semmens, Jayson M [0000-0003-1742-6692], Setyawan, Edy [0000-0001-6629-5997], Shea, Brendan D [0000-0001-7771-0586], Shillinger, George L [0000-0001-5168-4551], Shipley, Oliver N [0000-0001-5163-3471], Sianipar, Abraham B [0000-0003-4049-3893], Silva, Joana F [0000-0002-2897-1410], Sims, David W [0000-0002-0916-7363], Sousa, Lara L [0000-0002-4392-3572], Southall, Emily J [0000-0001-7246-278X], Spaet, Julia LY [0000-0001-8703-1472], Stevens, Guy [0000-0002-2056-9830], Sulikowski, James A [0000-0002-3646-5200], Thums, Michele [0000-0002-8669-8440], Tickler, David [0000-0001-7722-0771], Tolloti, Mariana T [0000-0001-6895-2479], Townsend, Kathy A [0000-0002-2581-2158], Travassos, Paulo [0000-0001-8667-5292], Tyminski, John P [0000-0001-8251-7385], Vaudo, Jeremy J [0000-0002-6826-3822], Veras, Drausio [0000-0001-5627-6848], Wantiez, Laurent [0000-0001-5024-2057], Weber, Sam B [0000-0003-1447-4082], Wells, RJ David [0000-0002-1306-0614], Weng, Kevin C [0000-0002-7069-7152], Wetherbee, Bradley M [0000-0002-3753-8950], Williamson, Jane E [0000-0003-3627-4508], Witt, Matthew J [0000-0002-9498-5378], Zilliacus, Kelly [0000-0001-9166-5611], Block, Barbara A [0000-0001-5181-3616], Curnick, David J [0000-0002-3093-1282], Apollo - University of Cambridge Repository, Zoological Society of London - ZSL (UNITED KINGDOM), Centre de recherches insulaires et observatoire de l'environnement (CRIOBE), Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), MARine Biodiversity Exploitation and Conservation (UMR MARBEC), and Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)

Subjects
Multidisciplinary, [SDV]Life Sciences [q-bio], Violacea Bonaparte, 3103 Ecology, Pelagic stingray, Scalloped hammerhead shark, 41 Environmental Sciences, Western North Pacific, Reproductive-biology, Habitat Use, Carcharhinus-falciformis, Galeocerdo-cuvier, Sexual segregation, Sphyna-lewini, 31 Biological Sciences
Abstract

20 pages, 3 tables, 5 figures.-- Samantha Andrzejaczek ... et al.-- Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC), Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understand their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on horizontal movements. Our study addresses the knowledge gap of vertical movements by compiling the first global synthesis of vertical habitat use by elasmobranchs from data obtained by deployment of 989 biotelemetry tags on 38 elasmobranch species. Elasmobranchs displayed high intra- and interspecific variability in vertical movement patterns. Substantial vertical overlap was observed for many epipelagic elasmobranchs, indicating an increased likelihood to display spatial overlap, biologically interact, and share similar risk to anthropogenic threats that vary on a vertical gradient. We highlight the critical next steps toward incorporating vertical movement into global management and monitoring strategies for elasmobranchs, emphasizing the need to address geographic and taxonomic biases in deployments and to concurrently consider both horizontal and vertical movements, Data analysis was funded by the Bertarelli Foundation through the Marine Science program through grants to D.J.C., B.A.B., and S.A. D.J.C. is also funded through Research England, UK. S.A. and B.A.B. thank the Moore Foundation and the Packard Foundation. F.G.-M. thanks the Instituto Politecnico Nacional for fellowships (COFAA, EDI). S.B.W. thanks funding from the Darwin Initiative (DPLUS046). A.D.M.D. acknowledges funding from the Research and Conservation Budget at Georgia Aquarium, including philanthropic gifts from several anonymous donors. K.F. acknowledges funding from the Rolex Awards for Enterprise and the Whitley Fund for Nature

Published
2022
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