Density and Biomass Estimates by Removal for an Amazonian Crocodilian, Paleosuchus palpebrosus
Direct counts of crocodilians are rarely feasible and it is difficult to meet the assumptions of mark-recapture methods for most species in most habitats. Catch-out experiments are also usually not logistically or morally justifiable because it would be necessary to destroy the habitat in order to b...
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description | Direct counts of crocodilians are rarely feasible and it is difficult to meet the assumptions of mark-recapture methods for most species in most habitats. Catch-out experiments are also usually not logistically or morally justifiable because it would be necessary to destroy the habitat in order to be confident that most individuals had been captured. We took advantage of the draining and filling of a large area of flooded forest during the building of the Santo Antônio dam on the Madeira River to obtain accurate estimates of the density and biomass of Paleosuchus palpebrosus. The density, 28.4 non-hatchling individuals per km2, is one of the highest reported for any crocodilian, except for species that are temporarily concentrated in small areas during dry-season drought. The biomass estimate of 63.15 kg*km-2 is higher than that for most or even all mammalian carnivores in tropical forest. P. palpebrosus may be one of the World´s most abundant crocodilians. |
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Catch-out experiments are also usually not logistically or morally justifiable because it would be necessary to destroy the habitat in order to be confident that most individuals had been captured. We took advantage of the draining and filling of a large area of flooded forest during the building of the Santo Antônio dam on the Madeira River to obtain accurate estimates of the density and biomass of Paleosuchus palpebrosus. The density, 28.4 non-hatchling individuals per km2, is one of the highest reported for any crocodilian, except for species that are temporarily concentrated in small areas during dry-season drought. The biomass estimate of 63.15 kg*km-2 is higher than that for most or even all mammalian carnivores in tropical forest. P. palpebrosus may be one of the World´s most abundant crocodilians.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0156406</identifier><identifier>PMID: 27224473</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Alligators and Crocodiles ; Animals ; Biology and Life Sciences ; Biomass ; Brazil ; Caiman crocodilus ; Carnivores ; Creeks & streams ; Crocodilia ; Dams ; Density ; Distribution ; Drainage ; Drought ; Earth Sciences ; Ecology and Environmental Sciences ; Environmental aspects ; Estimates ; Ethics ; Forests ; Freshwater ; Landfill ; Melanosuchus niger ; Paleosuchus palpebrosus ; Paleosuchus trigonatus ; People and places ; Population Density ; Rain ; Reptiles & amphibians ; Reptilia ; Rivers ; Seasons ; Tropical forests</subject><ispartof>PloS one, 2016-05, Vol.11 (5), p.e0156406-e0156406</ispartof><rights>COPYRIGHT 2016 Public Library of Science</rights><rights>2016 Campos, Magnusson. This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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Catch-out experiments are also usually not logistically or morally justifiable because it would be necessary to destroy the habitat in order to be confident that most individuals had been captured. We took advantage of the draining and filling of a large area of flooded forest during the building of the Santo Antônio dam on the Madeira River to obtain accurate estimates of the density and biomass of Paleosuchus palpebrosus. The density, 28.4 non-hatchling individuals per km2, is one of the highest reported for any crocodilian, except for species that are temporarily concentrated in small areas during dry-season drought. The biomass estimate of 63.15 kg*km-2 is higher than that for most or even all mammalian carnivores in tropical forest. P. palpebrosus may be one of the World´s most abundant crocodilians.</description><subject>Alligators and Crocodiles</subject><subject>Animals</subject><subject>Biology and Life Sciences</subject><subject>Biomass</subject><subject>Brazil</subject><subject>Caiman crocodilus</subject><subject>Carnivores</subject><subject>Creeks & streams</subject><subject>Crocodilia</subject><subject>Dams</subject><subject>Density</subject><subject>Distribution</subject><subject>Drainage</subject><subject>Drought</subject><subject>Earth Sciences</subject><subject>Ecology and Environmental Sciences</subject><subject>Environmental aspects</subject><subject>Estimates</subject><subject>Ethics</subject><subject>Forests</subject><subject>Freshwater</subject><subject>Landfill</subject><subject>Melanosuchus niger</subject><subject>Paleosuchus palpebrosus</subject><subject>Paleosuchus trigonatus</subject><subject>People and places</subject><subject>Population 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one</jtitle><addtitle>PLoS One</addtitle><date>2016-05-25</date><risdate>2016</risdate><volume>11</volume><issue>5</issue><spage>e0156406</spage><epage>e0156406</epage><pages>e0156406-e0156406</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Direct counts of crocodilians are rarely feasible and it is difficult to meet the assumptions of mark-recapture methods for most species in most habitats. Catch-out experiments are also usually not logistically or morally justifiable because it would be necessary to destroy the habitat in order to be confident that most individuals had been captured. We took advantage of the draining and filling of a large area of flooded forest during the building of the Santo Antônio dam on the Madeira River to obtain accurate estimates of the density and biomass of Paleosuchus palpebrosus. The density, 28.4 non-hatchling individuals per km2, is one of the highest reported for any crocodilian, except for species that are temporarily concentrated in small areas during dry-season drought. The biomass estimate of 63.15 kg*km-2 is higher than that for most or even all mammalian carnivores in tropical forest. P. palpebrosus may be one of the World´s most abundant crocodilians.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>27224473</pmid><doi>10.1371/journal.pone.0156406</doi><oa>free_for_read</oa></addata></record> |
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subjects | Alligators and Crocodiles Animals Biology and Life Sciences Biomass Brazil Caiman crocodilus Carnivores Creeks & streams Crocodilia Dams Density Distribution Drainage Drought Earth Sciences Ecology and Environmental Sciences Environmental aspects Estimates Ethics Forests Freshwater Landfill Melanosuchus niger Paleosuchus palpebrosus Paleosuchus trigonatus People and places Population Density Rain Reptiles & amphibians Reptilia Rivers Seasons Tropical forests |
title | Density and Biomass Estimates by Removal for an Amazonian Crocodilian, Paleosuchus palpebrosus |
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