Monitoring the Distribution, Abundance and Breeding Areas of Caiman crocodilus crocodilus and Melanosuchus niger in the Anavilhanas Archipelago, Central Amazonia, Brazil

Silveira, Ronis Da; Magnusson, William E.; Campos, Zilca

doi:10.2307/1565603

Cited by 52 publications

(54 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, we observed a number of populations with low number of individuals, which were scattered distributed throughout the survey sites. Such pattern differs from that observed in other species of the same genus, such as the Caiman crocodilus in the Brazilian Amazonia (Da Silveira et al, 1997) and Caiman yacare in the Pantanal (Coutinho and Campos, 1996), which occur in habitats relatively free from human impacts, particularly when compared to the SFB. Caiman latirostris from the SFB occurred in preserved habitats as well as in habitats affected strongly by human occupation.…”

Section: Study Areacontrasting

confidence: 94%

Distribution of populations of broad-snouted caiman (Caiman latirostris, Daudin 1802, Alligatoridae) in the São Francisco River basin, Brazil

Filogonio¹,

Vb²,

et al. 2010

Braz. J. Biol.

View full text Add to dashboard Cite

We surveyed populations of the broad-snouted caiman, Caiman latirostris, throughout the São Francisco River basin, from Três Marias reservoir, State of Minas Gerais, to the river delta, at the boarder of Sergipe and Alagoas states. We registered the occurrence of crocodilians in 61% of all surveyed localities (n = 64), in which the presence of C. latirostris was confirmed in 44% of the surveyed sites. Caimans occurred in both lentic and lotic habitats, although there was a preference for small dams, oxbow lakes and wetlands. Despite the hunting pressure and human impact on natural habitats, our results indicate that the populations of C. latirostris in the São Francisco basin are not fragmented.

show abstract

Section: Study Areacontrasting

confidence: 94%

Distribution of populations of broad-snouted caiman (Caiman latirostris, Daudin 1802, Alligatoridae) in the São Francisco River basin, Brazil

Filogonio¹,

Vb²,

et al. 2010

Braz. J. Biol.

View full text Add to dashboard Cite

show abstract

“…Other factors may explain part of the variability in PIs among river sections, as has been shown in other crocodilian population studies (Woodward and Marion, 1978;Wood et al, 1985;Hutton and Woolhouse, 1989;Da Silveira et al, 1997). Di erences in visibility among localities might introduce some bias in the results.…”

Section: Discussionmentioning

confidence: 80%

“…This presumption could not be tested with the current data. Spotlight-counts are subject to problems of interpretation when densities observed at times or habitats with di erent conditions of visibility are compared (Hutton and Woolhouse, 1989;Da Silveira et al, 1997). Furthermore, indices of relative abundance usually underestimate the true population size (Hutton and Woolhouse, 1989).…”

Section: Discussionmentioning

confidence: 99%

Population status of the Orinoco crocodile (Crocodylus intermedius) in the Cojedes river system, Venezuela

Seijas¹,

Chávez²

2000

Biological Conservation

View full text Add to dashboard Cite

“…O valor encontrado apresenta resultados similares aos obtidos por Mourão e Campos (1995) no Rio Paraná e seus afl uentes, que variou de 0,28 a 0,07 jacarés/km. A abundância relativa encontrada nos dois trabalhos parece baixa quando comparada com outras espécies de crocodilianos (Sánchez et al, 1996;Da Silveira et al, 1997;Platt e Thorbjarnarson, 2000). Verifi camos a ocorrência de um jacaré jovem, com comprimento total entre 0,3 e 0,5m.…”

Section: Resultsunclassified

“…Para acessar a abundância relativa do jacaré-depapo-amarelo na ESEC de Carijós foi utilizado o método de contagem noturna com a utilização de uma lanterna com facho de luz forte de foco concentrado (Mourão e Campos, 1995;Sánchez et al, 1996;Da Silveira et al, 1997;Platt e Thorbjarnarson, 2000). Utilizou-se uma embarcação de alumínio (4,5m de comprimento), movida por um motor de popa (9,9 HP), com a qual foram percorridas rotas fi xas a uma velocidade constante de 9km/h.…”

Section: Methodsunclassified

Abundância e locais de ocorrência do jacaré-de-papo-amarelo (Caiman latirostris, Alligatoridae) no noroeste da Ilha de Santa Catarina, SC

Fusco‐Costa

Tomás

2008

Biotemas

View full text Add to dashboard Cite

ResumoEste é o primeiro estudo sobre a distribuição e abundância relativa do jacaré-de-papo-amarelo na Ilha de Santa Catarina. Foi estimada a abundância relativa do jacaré ao longo dos rios na Estação Ecológica de Carijós, além de verifi car a sua ocorrência em toda a planície do Rio Ratones, noroeste da ilha. A média da abundância relativa foi de 0,25 (±0,07) jacarés/km percorrido, sendo obtida através de contagem noturna. Houve uma fraca correlação do número de jacarés com a temperatura do ar. Através de entrevistas com moradores locais e levantamento noturno da espécie em açudes e rios no entorno da unidade de conservação, foi verifi cado que os jacarés cobrem toda a planície do Rio Ratones, podendo ser encontrados em habitats naturais (rios, banhados, manguezais) e artifi ciais (canais de drenagem e açudes). Embora este estudo revele informações básicas sobre a distribuição do Caiman latirostris no noroeste da ilha, ele serve como base para futuras pesquisas. Unitermos: Caiman latirostris, manguezal, conservação, ilha, Estação Ecológica de Carijós AbstractAbundance and local range of broad-snouted caiman (Caiman latirostris, Alligatoridae) in the northwest of Santa Catarina Island. This is the fi rst report on the distribution and relative abundance of the broad-snouted caiman on Santa Catarina Island. The study estimated the relative abundance of caiman along the rivers at Estação Ecológica de Carijós, in addition to evaluating the occurrence of this species in the entire area of the Ratones River plain on the northwestern portion of the island. The mean relative abundance obtained by nocturnal counts was 0.25 (±0.07) caiman/km surveyed. There was a weak correlation between the number of caimans and the air temperature. Based on interviews with the local community and nocturnal surveys of caimans in rivers and reservoirs surrounding the protected area, we concluded that the range occupied by caimans covered the entire area of the Ratones river plain, inhabiting natural habitats (rivers, mangroves, swamps) as well as artifi cial habitats (reservoirs and water channels). Although this study provides basic information about the broad-snouted caiman population on this part of the island, it is aimed mainly at providing guidance for future research.

show abstract

Monitoring the Distribution, Abundance and Breeding Areas of Caiman crocodilus crocodilus and Melanosuchus niger in the Anavilhanas Archipelago, Central Amazonia, Brazil

Cited by 52 publications

References 7 publications

Distribution of populations of broad-snouted caiman (Caiman latirostris, Daudin 1802, Alligatoridae) in the São Francisco River basin, Brazil

Distribution of populations of broad-snouted caiman (Caiman latirostris, Daudin 1802, Alligatoridae) in the São Francisco River basin, Brazil

Population status of the Orinoco crocodile (Crocodylus intermedius) in the Cojedes river system, Venezuela

Abundância e locais de ocorrência do jacaré-de-papo-amarelo (Caiman latirostris, Alligatoridae) no noroeste da Ilha de Santa Catarina, SC

Contact Info

Product

Resources

About