%0 Journal Article %1 cantor_assessing_2012 %A Cantor, Mauricio %A Wedekin, Leonardo L %A Daura‐Jorge, Fábio G %A Rossi‐Santos, Marcos R %A Simões‐Lopes, Paulo C %D 2012 %J Marine Mammal Science %K Sotalia abundance, capture-recapture, cetacean, design, dynamics, emigration guianensis, odontocetes, population robust survival, temporary trends, %N 1 %P 63--83 %R 10.1111/j.1748-7692.2010.00456.x %T Assessing population parameters and trends of Guiana dolphins (Sotalia guianensis): An eight‐year mark‐recapture study %U http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2010.00456.x/abstract %V 28 %X This 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.

@article{cantor_assessing_2012, abstract = {This 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.}, added-at = {2017-01-09T13:57:26.000+0100}, author = {Cantor, Mauricio and Wedekin, Leonardo L and Daura‐Jorge, Fábio G and Rossi‐Santos, Marcos R and Simões‐Lopes, Paulo C}, biburl = {https://www.bibsonomy.org/bibtex/27b0c4000e5752d08dad6e52cd0540ae7/yourwelcome}, doi = {10.1111/j.1748-7692.2010.00456.x}, interhash = {d168c5940992c89f58407ca9b59b985b}, intrahash = {7b0c4000e5752d08dad6e52cd0540ae7}, issn = {1748-7692}, journal = {Marine Mammal Science}, keywords = {Sotalia abundance, capture-recapture, cetacean, design, dynamics, emigration guianensis, odontocetes, population robust survival, temporary trends,}, language = {en}, month = jan, number = 1, pages = {63--83}, shorttitle = {Assessing population parameters and trends of {Guiana} dolphins ({Sotalia} guianensis)}, timestamp = {2017-01-09T14:01:11.000+0100}, title = {Assessing population parameters and trends of {Guiana} dolphins (\textit{{Sotalia} guianensis}): {An} eight‐year mark‐recapture study}, url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2010.00456.x/abstract}, urldate = {2012-02-27}, volume = 28, year = 2012 }