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3 results on '"Labaja J"'

1. Diving into the vertical dimension of elasmobranch movement ecology

Author

Andrzejaczek, S., Lucas, T.C.D., Goodman, M.C., Hussey, N.E., Armstrong, A.J., Carlisle, A., Coffey, D.M., Gleiss, A.C., Huveneers, C., Jacoby, D.M.P., Meekan, M.G., Mourier, J., Peel, L.R., Abrantes, K., Afonso, A.S., Ajemian, M.J., Anderson, B.N., Anderson, S.D., Araujo, G., Armstrong, A.O., Bach, P., Barnett, A., Bennett, M.B., Bezerra, N.A., Bonfil, R., Boustany, A.M., Bowlby, H.D., Branco, I., Braun, C.D., Brooks, E.J., Brown, J., Burke, P.J., Butcher, P., Castleton, M., Chapple, T.K., Chateau, O., Clarke, M., Coelho, R., Cortés, E., Couturier, L.I.E., Cowley, P.D., Croll, D.A., Cuevas, J.M., Curtis, T.H., Dagorn, L., Dale, J.J., Daly, R., Dewar, H., Doherty, P.D., Domingo, A., Dove, A.D.M., Drew, M., Dudgeon, C.L., Duffy, C.A.J., Elliott, R.G., Ellis, J.R., Erdmann, M.V., Farrugia, T.J., Ferreira, L.C., Ferretti, F., Filmalter, J.D., Finucci, B., Fischer, C., Fitzpatrick, R., Forget, F., Forsberg, K., Francis, M.P., Franks, B.R., Gallagher, A.J., Galván-Magaña, F., García, M.L., Gaston, T.F., Gillanders, B.M., Gollock, M.J., Green, J.R., Green, S., Griffiths, C.A., Hammerschlag, N., Hasan, A., Hawkes, L.A., Hazin, F., Heard, M., Hearn, A., Hedges, K.J., Henderson, S.M., Holdsworth, J., Holland, K.N., Howey, L.A., Hueter, R.E., Humphries, N.E., Hutchinson, M., Jaine, F.R.A., Jorgensen, S.J., Kanive, P.E., Labaja, J., Lana, F.O., Lassauce, H., Lipscombe, R.S., Llewellyn, F., Macena, B.C.L., Mambrasar, R., McAllister, J.D., McCully Phillips, S.R., McGregor, F., McMillan, M.N., McNaughton, L.M., Mendonça, S.A., Meyer, C.G., Meyers, M., Mohan, J.A., Montgomery, J.C., Mucientes, G., Musyl, M.K., Nasby-Lucas, N., Natanson, L.J., O’Sullivan, J.B., Oliveira, P., Papastamtiou, Y.P., Patterson, T.A., Pierce, S.J., Queiroz, N., Radford, C.A., Richardson, A.J., Righton, D., Rohner, C.A., Royer, M.A., Saunders, R.A., Schaber, M., Schallert, R.J., Scholl, M.C., Seitz, A.C., Semmens, J.M., Setyawan, E., Shea, B.D., Shidqi, R.A., Shillinger, G.L., Shipley, O.N., Shivji, M.S., Sianipar, A.B., Silva, J.F., Sims, D.W., Skomal, G.B., Sousa, L.L., Southall, E.J., Spaet, J.L.Y., Stehfest, K.M., Stevens, G., Stewart, J.D., Sulikowski, J.A., Syakurachman, I., Thorrold, S.R., Thums, M., Tickler, D., Tolloti, M.T., Townsend, K.A., Travassos, P., Tyminski, J.P., Vaudo, J.J., Veras, D., Wantiez, L., Weber, S.B., Wells, R.J.D., Weng, K.C., Wetherbee, B.M., Williamson, J.E., Witt, M.J., Wright, S., Zilliacus, K., Block, B.A., Curnick, D.J., Andrzejaczek, S., Lucas, T.C.D., Goodman, M.C., Hussey, N.E., Armstrong, A.J., Carlisle, A., Coffey, D.M., Gleiss, A.C., Huveneers, C., Jacoby, D.M.P., Meekan, M.G., Mourier, J., Peel, L.R., Abrantes, K., Afonso, A.S., Ajemian, M.J., Anderson, B.N., Anderson, S.D., Araujo, G., Armstrong, A.O., Bach, P., Barnett, A., Bennett, M.B., Bezerra, N.A., Bonfil, R., Boustany, A.M., Bowlby, H.D., Branco, I., Braun, C.D., Brooks, E.J., Brown, J., Burke, P.J., Butcher, P., Castleton, M., Chapple, T.K., Chateau, O., Clarke, M., Coelho, R., Cortés, E., Couturier, L.I.E., Cowley, P.D., Croll, D.A., Cuevas, J.M., Curtis, T.H., Dagorn, L., Dale, J.J., Daly, R., Dewar, H., Doherty, P.D., Domingo, A., Dove, A.D.M., Drew, M., Dudgeon, C.L., Duffy, C.A.J., Elliott, R.G., Ellis, J.R., Erdmann, M.V., Farrugia, T.J., Ferreira, L.C., Ferretti, F., Filmalter, J.D., Finucci, B., Fischer, C., Fitzpatrick, R., Forget, F., Forsberg, K., Francis, M.P., Franks, B.R., Gallagher, A.J., Galván-Magaña, F., García, M.L., Gaston, T.F., Gillanders, B.M., Gollock, M.J., Green, J.R., Green, S., Griffiths, C.A., Hammerschlag, N., Hasan, A., Hawkes, L.A., Hazin, F., Heard, M., Hearn, A., Hedges, K.J., Henderson, S.M., Holdsworth, J., Holland, K.N., Howey, L.A., Hueter, R.E., Humphries, N.E., Hutchinson, M., Jaine, F.R.A., Jorgensen, S.J., Kanive, P.E., Labaja, J., Lana, F.O., Lassauce, H., Lipscombe, R.S., Llewellyn, F., Macena, B.C.L., Mambrasar, R., McAllister, J.D., McCully Phillips, S.R., McGregor, F., McMillan, M.N., McNaughton, L.M., Mendonça, S.A., Meyer, C.G., Meyers, M., Mohan, J.A., Montgomery, J.C., Mucientes, G., Musyl, M.K., Nasby-Lucas, N., Natanson, L.J., O’Sullivan, J.B., Oliveira, P., Papastamtiou, Y.P., Patterson, T.A., Pierce, S.J., Queiroz, N., Radford, C.A., Richardson, A.J., Righton, D., Rohner, C.A., Royer, M.A., Saunders, R.A., Schaber, M., Schallert, R.J., Scholl, M.C., Seitz, A.C., Semmens, J.M., Setyawan, E., Shea, B.D., Shidqi, R.A., Shillinger, G.L., Shipley, O.N., Shivji, M.S., Sianipar, A.B., Silva, J.F., Sims, D.W., Skomal, G.B., Sousa, L.L., Southall, E.J., Spaet, J.L.Y., Stehfest, K.M., Stevens, G., Stewart, J.D., Sulikowski, J.A., Syakurachman, I., Thorrold, S.R., Thums, M., Tickler, D., Tolloti, M.T., Townsend, K.A., Travassos, P., Tyminski, J.P., Vaudo, J.J., Veras, D., Wantiez, L., Weber, S.B., Wells, R.J.D., Weng, K.C., Wetherbee, B.M., Williamson, J.E., Witt, M.J., Wright, S., Zilliacus, K., Block, B.A., and Curnick, D.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.

Published
2022

2. Improving sightings-derived residency estimation for whale shark aggregations: A novel metric applied to a global data set

Author

Araujo, G., Agustines, A., Bach, S.S., Cochran, J.E.M., de la Parra-Galván, E., de la Parra-Venegas, R., Diamant, S., Dove, A., Fox, S., Graham, R.T., Green, S.M., Green, J.R., Hardenstine, R.S., Hearn, A., Himawan, M.R., Hobbs, R., Holmberg, J., Shameel, I., Jaidah, M.Y., Labaja, J., Leblond, S., Legaspi, C.G., Maguiño, R., Magson, K., Marcoux, S.D., Marcoux, T.M., Marley, S.A., Matalobos, M., Mendoza, A., Miranda, J.A., Norman, B.M., Perry, C.T., Pierce, S.J., Ponzo, A., Prebble, C.E.M., Ramírez-Macías, D., Rees, R., Reeve-Arnold, K.E., Reynolds, S.D., Robinson, D.P., Rohner, C.A., Rowat, D., Snow, S., Vázquez-Haikin, A., Watts, A.M., Araujo, G., Agustines, A., Bach, S.S., Cochran, J.E.M., de la Parra-Galván, E., de la Parra-Venegas, R., Diamant, S., Dove, A., Fox, S., Graham, R.T., Green, S.M., Green, J.R., Hardenstine, R.S., Hearn, A., Himawan, M.R., Hobbs, R., Holmberg, J., Shameel, I., Jaidah, M.Y., Labaja, J., Leblond, S., Legaspi, C.G., Maguiño, R., Magson, K., Marcoux, S.D., Marcoux, T.M., Marley, S.A., Matalobos, M., Mendoza, A., Miranda, J.A., Norman, B.M., Perry, C.T., Pierce, S.J., Ponzo, A., Prebble, C.E.M., Ramírez-Macías, D., Rees, R., Reeve-Arnold, K.E., Reynolds, S.D., Robinson, D.P., Rohner, C.A., Rowat, D., Snow, S., Vázquez-Haikin, A., and Watts, A.M.

Abstract

The world’s largest extant fish, the whale shark Rhincodon typus, is one of the most-studied species of sharks globally. The discovery of predictable aggregation sites where these animals gather seasonally or are sighted year-round – most of which are coastal and juvenile-dominated – has allowed for a rapid expansion of research on this species. The most common method for studying whale sharks at these sites is photographic identification (photo-ID). This technique allows for long-term individual-based data to be collected which can, in turn, be used to evaluate population structure, build population models, identify long-distance movements, and assess philopatry and other population dynamics. Lagged identification rate (LIR) models have fewer underlying assumptions than more traditional capture mark recapture approaches, making them more broadly applicable to marine taxa, especially far-ranging megafauna species like whale sharks. However, the increased flexibility comes at a cost. Parameter estimations based on LIR can be difficult to interpret and may not be comparable between areas with different sampling regimes. Using a unique data-set from the Philippines with ~8 years of nearly continuous survey effort, we were able to derive a metric for converting LIR residency estimates into more intuitive days-per-year units. We applied this metric to 25 different sites allowing for the first quantitatively-meaningful comparison of sightings-derived residence among the world’s whale shark aggregations. We validated these results against the only three published acoustic residence metrics (falling within the ranges established by these earlier works in all cases). The results were then used to understand residency behaviours exhibited by the sharks at each site. The adjusted residency metric is an improvement to LIR-based population modelling, already one of the most widely used tools for describing whale shark aggregations. The standardised methods presented here can ser

Published
2022

3. Global collision-risk hotspots of marine traffic and the world’s largest fish, the whale shark

Author

Womersley, F.C., Humphries, N.E., Queiroz, N., Vedor, M., da Costa, I., Furtado, M., Tyminski, J.P., Abrantes, K., Araujo, G., Bach, S.S., Barnett, A., Berumen, M.L., Bessudo Lion, S., Braun, C.D., Clingham, E., Cochran, J.E.M., de la Parra, R., Diamant, S., Dove, A.D.M., Dudgeon, C.L., Erdmann, M.V., Espinoza, E., Fitzpatrick, R., Cano, J.G., Green, J.R., Guzman, H.M., Hardenstine, R., Hasan, A., Hazin, F.H.V., Hearn, A.R., Hueter, R.E., Jaidah, M.Y., Labaja, J., Ladino, F., Macena, B.C.L., Morris, J.J., Norman, B.M., Peñaherrera-Palma, C., Pierce, S.J., Quintero, L.M., Ramirez-Macias, D., Reynolds, S.D., Richardson, A.J., Robinson, D.P., Rohner, C.A., Rowat, D.R.L., Sheaves, M., Shivji, M.S., Sianipar, A.B., Skomal, G.B., Soler, G., Syakurachman, I., Thorrold, S.R., Webb, D.H., Wetherbee, B.M., White, T.D., Clavelle, T., Kroodsma, D.A., Thums, M., Ferreira, L.C., Meekan, M.G., Arrowsmith, L.M., Lester, E.K., Meyers, M.M., Peel, L.R., Sequeira, A.M.M., Eguíluz, V.M., Duarte, C.M., Sims, D.W., Womersley, F.C., Humphries, N.E., Queiroz, N., Vedor, M., da Costa, I., Furtado, M., Tyminski, J.P., Abrantes, K., Araujo, G., Bach, S.S., Barnett, A., Berumen, M.L., Bessudo Lion, S., Braun, C.D., Clingham, E., Cochran, J.E.M., de la Parra, R., Diamant, S., Dove, A.D.M., Dudgeon, C.L., Erdmann, M.V., Espinoza, E., Fitzpatrick, R., Cano, J.G., Green, J.R., Guzman, H.M., Hardenstine, R., Hasan, A., Hazin, F.H.V., Hearn, A.R., Hueter, R.E., Jaidah, M.Y., Labaja, J., Ladino, F., Macena, B.C.L., Morris, J.J., Norman, B.M., Peñaherrera-Palma, C., Pierce, S.J., Quintero, L.M., Ramirez-Macias, D., Reynolds, S.D., Richardson, A.J., Robinson, D.P., Rohner, C.A., Rowat, D.R.L., Sheaves, M., Shivji, M.S., Sianipar, A.B., Skomal, G.B., Soler, G., Syakurachman, I., Thorrold, S.R., Webb, D.H., Wetherbee, B.M., White, T.D., Clavelle, T., Kroodsma, D.A., Thums, M., Ferreira, L.C., Meekan, M.G., Arrowsmith, L.M., Lester, E.K., Meyers, M.M., Peel, L.R., Sequeira, A.M.M., Eguíluz, V.M., Duarte, C.M., and Sims, D.W.

Abstract

Marine traffic is increasing globally yet collisions with endangered megafauna such as whales, sea turtles, and planktivorous sharks go largely undetected or unreported. Collisions leading to mortality can have population-level consequences for endangered species. Hence, identifying simultaneous space use of megafauna and shipping throughout ranges may reveal as-yet-unknown spatial targets requiring conservation. However, global studies tracking megafauna and shipping occurrences are lacking. Here we combine satellite-tracked movements of the whale shark, Rhincodon typus, and vessel activity to show that 92% of sharks’ horizontal space use and nearly 50% of vertical space use overlap with persistent large vessel (>300 gross tons) traffic. Collision-risk estimates correlated with reported whale shark mortality from ship strikes, indicating higher mortality in areas with greatest overlap. Hotspots of potential collision risk were evident in all major oceans, predominantly from overlap with cargo and tanker vessels, and were concentrated in gulf regions, where dense traffic co-occurred with seasonal shark movements. Nearly a third of whale shark hotspots overlapped with the highest collision-risk areas, with the last known locations of tracked sharks coinciding with busier shipping routes more often than expected. Depth-recording tags provided evidence for sinking, likely dead, whale sharks, suggesting substantial “cryptic” lethal ship strikes are possible, which could explain why whale shark population declines continue despite international protection and low fishing-induced mortality. Mitigation measures to reduce ship-strike risk should be considered to conserve this species and other ocean giants that are likely experiencing similar impacts from growing global vessel traffic.

Published
2022

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