Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, Ecuador

Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, Ecuador

An assessment on the population ecology, distribution and habitat of the American crocodile (Crocodylus acutus) was conducted within the recent protected area “Reserva de producción de fauna manglares El Salado”, Gulf of Guayaquil, Ecuador. The study was developed along 15 km of...

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Autores principales: Carvajal,Raúl I, Saavedra,Miguel, Alava,Juan José
Lenguaje:English
Publicado: Universidad de Valparaíso. Facultad de Ciencias del Mar 2005
Materias:
population
density
salinity
temperature
American crocodile
Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572005000200007
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spelling oai:scielo:S0718-195720050002000072006-03-06Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, EcuadorCarvajal,Raúl ISaavedra,MiguelAlava,Juan José population density salinity temperature American crocodile An assessment on the population ecology, distribution and habitat of the American crocodile (Crocodylus acutus) was conducted within the recent protected area “Reserva de producción de fauna manglares El Salado”, Gulf of Guayaquil, Ecuador. The study was developed along 15 km of mangrove channels and tidal creeks, using nocturnal spotlight boat surveys during the dry season (September to December, 2004). About four crocodiles, with a relative abundance of 0.45 ind./km, ranging 0.27-0.63 ind./km, were detected. Crocodiles were aggregated in the final extreme of a tidal creek (Estero Plano Seco), where the water salinity ranged 10.0-28.0 psu and releasing of effluents (>32.0°C) from electric power plants and run-off from urbanized centers have been evidenced. Most of the crocodile sightings occurred during low tide. The population was represented only by adults (50%) and juveniles (50%); subadults and hatchlings were not observed during the study period. The population density found in this study is one of the lowest densities for American crocodile in the American regions. The euryhaline ability and tolerance to inhabit elevated surface water temperature (thermoconformer) confirm the physiological adaptation of this reptile species. More ecologic and population studies are needed to elucidate some gaps and the environmental factors influencing on the species conservation, as well as the establishment of management strategies to ensure its survival.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.40 n.2 20052005-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572005000200007en10.4067/S0718-19572005000200007
institution Scielo Chile
collection Scielo Chile
language English
topic population
density
salinity
temperature
American crocodile
spellingShingle population
density
salinity
temperature
American crocodile
Carvajal,Raúl I
Saavedra,Miguel
Alava,Juan José
Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, Ecuador
description An assessment on the population ecology, distribution and habitat of the American crocodile (Crocodylus acutus) was conducted within the recent protected area “Reserva de producción de fauna manglares El Salado”, Gulf of Guayaquil, Ecuador. The study was developed along 15 km of mangrove channels and tidal creeks, using nocturnal spotlight boat surveys during the dry season (September to December, 2004). About four crocodiles, with a relative abundance of 0.45 ind./km, ranging 0.27-0.63 ind./km, were detected. Crocodiles were aggregated in the final extreme of a tidal creek (Estero Plano Seco), where the water salinity ranged 10.0-28.0 psu and releasing of effluents (>32.0°C) from electric power plants and run-off from urbanized centers have been evidenced. Most of the crocodile sightings occurred during low tide. The population was represented only by adults (50%) and juveniles (50%); subadults and hatchlings were not observed during the study period. The population density found in this study is one of the lowest densities for American crocodile in the American regions. The euryhaline ability and tolerance to inhabit elevated surface water temperature (thermoconformer) confirm the physiological adaptation of this reptile species. More ecologic and population studies are needed to elucidate some gaps and the environmental factors influencing on the species conservation, as well as the establishment of management strategies to ensure its survival.
author Carvajal,Raúl I
Saavedra,Miguel
Alava,Juan José
author_facet Carvajal,Raúl I
Saavedra,Miguel
Alava,Juan José
author_sort Carvajal,Raúl I
title Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, Ecuador
title_short Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, Ecuador
title_full Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, Ecuador
title_fullStr Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, Ecuador
title_full_unstemmed Population ecology, distribution and habitat assessment of Crocodylus acutus (Cuvier 1807) in the “Reserva de producción de fauna manglares El Salado” of the Guayaquil Gulf Estuary, Ecuador
title_sort population ecology, distribution and habitat assessment of crocodylus acutus (cuvier 1807) in the “reserva de producción de fauna manglares el salado” of the guayaquil gulf estuary, ecuador
publisher Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate 2005
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572005000200007
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