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| Siqueira,Alexandre C.; Quimbayo,Juan P.; Cantor,Mauricio; Silveira,Rosana B.; Daura-Jorge,Fábio G.. |
| ABSTRACT Estimating population parameters is essential for understanding the ecology of species, which ultimately helps to assess their conservation status. The seahorse Hippocampus reidi is directly exposed to anthropogenic threats along the Brazilian coast, but the species still figures as Data Deficient (DD) at IUCN’s Red List. To provide better information on the ecology of this species, we studied how population parameters vary over time in a natural subtropical environment. By combing mark-recapture models for open and closed populations, we estimated abundance, survival rate, emigration probability, and capture probability. We marked 111 individuals, which showed a 1:1 sex ratio, and an average size of 10.5 cm. The population showed high survival... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capture Probability; Emigration Probability; Population Ecology; Robust Design; Survival Rate. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000400208 |
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| Daura-Jorge,Fábio G.; Rossi-Santos,Marcos R.; Wedekin,Leonardo L.; Simões-Lopes,Paulo C.. |
| The behavioral patterns of the estuarine dolphin, Sotalia guianensis (P. J. van Bénéden, 1864), were compared between two populations along the Brazilian coast: Caravelas (Bahia), along the eastern coast, and Norte Bay (Santa Catarina), along the southern coast. Applying the focal-group sampling in both areas, information such as the geographic position (UTM) of groups and predominant behavioral patterns were obtained. Geographic positions were used to calculate the total distance traveled by estuarine dolphin groups on each observation day. Since the distance traveled varies with time, the daily mean speed of the dolphins group was used as an index of movement intensity. Two comparable and easily recognizable behavioral patterns were considered:... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Behavior; Estuarine dolphin; Caravelas estuary; Norte Bay; Spatial requirements. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000200001 |
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| Daura-Jorge,Fábio G.; Wedekin,Leonardo L.; Piacentini,Vítor de Q.; Simões-Lopes,Paulo C.. |
| The resident population of estuarine dolphin, Sotalia guianensis (P.J. van Bénéden, 1864), in Norte Bay, Santa Catarina, southern Brazil, was studied from 2000 to 2003. Systematic one-day cruises were undertaken aboard a 5 m sail boat equipped with an outboard motor. Applying the focal-group method, information such as geographical position, predominant behavioural patterns, group size, cohesion index and the presence of calves, were registered at every five-minute interval, totalling 198 hours of direct observation of the dolphins. The estuarine dolphin used preferential areas for each behavioural pattern. The mean group size was approximately 29 individuals, and the presence of calves occurred throughout the entire year, but with a significant increase... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Behaviour; Ecology; Group organization; Norte Bay; Temporal patterns. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000400029 |
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