Assessing population parameters and trends of Guiana dolphins (Sotalia guianensis): An eight‐year mark‐recapture study

Marine Mammal Science - Tập 28 Số 1 - Trang 63-83 - 2012
Maurício Cantor1, Leonardo Liberali Wedekin2, Fábio G. Daura‐Jorge3, Marcos R. Rossi‐Santos2, Paulo C. Simões‐Lopes3
1Universidade Federal de Santa Catarina, Florianópolis, Brazil
2Instituto Baleia Jubarte,
Rua Barão do Rio Branco, 26,
CEP 45900‐000, Caravelas, Bahia, Brazil
3Laboratório de Mamíferos Aquáticos,Departamento de Ecologia e Zoologia,Centro Ciências Biológicas,Universidade Federal de Santa Catarina,P. O. Box 5102, CEP 88040‐970,Florianópolis, Santa Catarina, Brazil

Tóm tắt

AbstractThis study represents the first attempt to study the population dynamics of Guiana dolphins (Sotalia guianensis), by evaluating a set of demographic parameters. The population of the Caravelas River estuary, eastern Brazil, was systematically monitored through a long‐term mark‐recapture experiment (2002–2009). Abundance estimates revealed a small population (57–124 dolphins), comprised of resident dolphins and individuals that temporarily leave or pass through the study area. Temporary emigration from the estuary to adjacencies (γ″= 0.33 ± 0.07 SE) and return rate (1 −γ′= 0 .67) were moderate and constant, indicating that some dolphins use larger areas. Survival rate (ϕ= 0.88 ± 0.07 SE) and abundance were constant throughout the study period. Power analysis showed that the current monitoring effort has high probability of detecting abrupt population declines (1 −β= 0.9). Although the monitoring is not yet sensitive to subtle population trends, sufficient time to identify them is feasible (additional 3 yr). Despite such apparent stability, this population, as many others, inhabits waters exposed to multiple human‐related threats. Open and closed population modeling applied to photo‐identification data provide a robust baseline for estimating several demographic parameters and can be applied to other populations to allow further comparisons. Such synergistic efforts will allow a reliable definition of conservation status of this species.

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Tài liệu tham khảo

Acuña L. B.2002.Estimativa do tamanho da população do boto‐tucuxi‐marinho Sotalia fluviatilis(Cetacea Delphinidae) na região do estuário de Cananéia São Paulo por meio de catálogo de foto‐identificação para a espécie.M.Sc. thesis Universidade de São Paulo São Paulo SP .73pp.

Amstrup S. C., 2005, Handbook of capture‐recapture analysis

10.2307/1939637

10.1590/S0101-81752008000100001

10.1890/03-0539

10.1002/aqc.843

10.3354/meps252273

10.1139/z91-148

10.1644/1545-1542(2003)084<0065:ESACPO>2.0.CO;2

10.1111/j.1365-2656.2006.01201.x

Buckland S. T., 2001, Introduction to distance sampling: Estimating abundance of biological populations, 10.1093/oso/9780198506492.001.0001

Burnham K. P., 2002, Model selection and multimodel inference: A practical information‐theoretic approach

Burnham K. P., 1987, Design and analysis of fish survival experiments based on release‐recapture data

10.2307/1400593

10.3354/meps184291

Chao A., 2005, Handbook of capture‐recapture analysis, 58

10.2193/0022-541X(2006)70[1711:SMRTTA]2.0.CO;2

10.1093/biomet/51.3-4.429

Cremer M. J.2007.Ecologia e conservação de populações simpátricas de pequenos cetáceos em região estuarina no sul do Brasil.Ph.D. thesis Universidade Federal do Paraná Curitiba PR Brazil .212pp.

10.1002/aqc.1015

10.1590/S0101-81752005000400029

De Freitas Azevedo A. F., 2004, A note on site fidelity of marine tucuxis (Sotalia fluviatilis) in Guanabara Bay, southeastern Brazil, Journal of Cetacean Research and Management, 6, 265

Defran R. H., 1990, A technique for the photographic identification and cataloging of dorsal fins of the bottlenose dolphin (Tursiops truncatus), Report of the International Whaling Commission, 12, 53

10.5597/lajam00035

10.1111/j.1748-7692.2001.tb00998.x

10.1071/MF9910555

Filla G., 2008, Proposal for creation of a “zoning with regulation of use in the Cananéia estuarine‐lagoon complex” aiming the conservation of the estuarine dolphin, Sotalia guianensis (van Bénéden, 1864) (Cetacea: Delphinidae), Pan American Journal of Aquatic Sciences, 3, 75

10.1017/S0025315409002926

Flach L., 2008, Density, abundance and distribution of the Guiana dolphin (Sotalia guianensis van Bénéden. 1864) in Sepetiba Bay, southeast Brazil, Journal of Cetacean Research and Management, 10, 31, 10.47536/jcrm.v10i1.657

10.1111/j.1748-7692.1999.tb00846.x

10.5597/lajam00047

10.1046/j.1523-1739.2000.99412.x

Fortuna C. M.2006.Ecology and conservation of bottlenose dolphins (Tursiops truncatus) in the north‐eastern Adriatic Sea.Ph.D. thesis University of St Andrews St Andrews Scotland .256pp.

10.1515/mamm.1991.55.3.371

10.1590/S0034-71081999000200002

10.2307/1939220

Gerrodette T., 1993, Trends: Software for a power analysis of linear regression, Wildlife Society Bulletin, 21, 515

10.1046/j.1461-0248.2001.00230.x

Hammond P. S., 1990, Heterogeneity in the Gulf of Maine? Estimating humpback whale population size when capture probabilities are not equal, Report of the International Whaling Commission, 12, 135

Hammond P. S., 1990, Individual recognition of cetaceans: Use of photo‐identification and other techniques to estimate population parameters, Report of the International Whaling Commission, 440

IBAMA, 2001, Mamíferos aquáticos do Brasil: Plano de ação

10.1093/biomet/52.1-2.225

10.1890/0012-9658(1999)080[2517:ROCCRM]2.0.CO;2

10.2307/2533335

10.1890/0012-9658(1997)078[0563:ETEUCR]2.0.CO;2

10.2307/2937171

10.1071/WR07021

10.1111/j.1748-7692.2003.tb01103.x

10.1644/BOS-123

Otis D. L., 1978, Statistical inference from capture data on closed animal population, Wildlife Monographs, 62, 1

10.1016/j.biocon.2005.10.031

Pizzorno J. L. A.1999.Estimativa populacional do boto‐cinzaSotalia fluviatilisna Baía de Guanabara por meio de catálogo de foto‐identificação.M.Sc. thesis Universidade Federal Rural do Rio de Janeiro Seropédica RJ Brazil .47pp.

10.1111/j.0006-341X.2000.00434.x

10.2307/3808568

10.2307/2533097

10.3354/meps319287

10.3354/meps08426

Reeves R. R. E. A.Crespo S. L.Dans et al.2008.Sotalia fluviatilis. IUCN Red List of Threatened Species 2009. (Available athttp://www.iucnredlist.org accessed 2 March 2010).

10.1111/j.1748-7692.2009.00324.x

10.5597/lajam00088

10.1017/S0025315407055683

Santos M. C. O., 2001, A note on site fidelity and calving intervals of the marine tucuxi dolphins (Sotalia fluviatilis) in South‐eastern Brazil, Journal of Marine Biological Association of United Kingdom, 81, 1048

10.1890/0012-9658(2001)082[0852:MBSOLT]2.0.CO;2

10.2307/2533048

10.1093/biomet/52.1-2.249

Seber G. A. F., 1982, The estimation of animal abundance and related parameters

10.1017/S002531540800043X

10.2307/3504117

10.3354/meps08233

10.1111/j.1748-7692.2003.tb01121.x

10.1046/j.1523-1739.1993.07030489.x

10.1111/j.1748-7692.2006.00092.x

10.5597/lajam00108

10.1016/j.marenvres.2008.11.002

10.1111/j.1748-7692.2008.00280.x

Wedekin L. L., 2005, The use of a conceptual model to describe the conservation scenario of the estuarine dolphin within the Baia Norte (North Bay), southern Brazil, The Brazilian Journal of Nature Conservation, 3, 162

10.1590/S1519-69842007000100002

Wells R. S., 1990, Estimating bottlenose dolphin population parameters from individual identification and capture‐recapture techniques, Report of the International Whaling Commission, 12, 407

10.1080/00063659909477239

10.1139/z93-293

Williams B. K., 2002, Analysis and management of animal populations

10.2307/2405254

10.1890/1051-0761(1999)009[0288:ESAATI]2.0.CO;2

10.1016/S0048-9697(03)00198-0

10.1111/j.0006-341X.2002.00832.x

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Marine Mammal Science

Tập 28 Số 1

63-83

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