When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander

Monitoring wild populations is an essential tool to assess the conservation status and the ecological requirements of a species. Capture–mark–recapture (CMR), based on individual recognition, is the most commonly used and most effective technique. However, in cases of species with no individual colo...

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Autores principales:	Antonio Romano, Luca Roner, Andrea Costa, Sebastiano Salvidio, Matteo Trenti, Paolo Pedrini
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	abundance estimation alps amphibians double observer salamanders Environmental sciences GE1-350 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/66d816bc9bf046a1ba3b35b8b954ad1c
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spelling	oai:doaj.org-article:66d816bc9bf046a1ba3b35b8b954ad1c2021-11-26T11:19:47ZWhen no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander1523-04301938-424610.1080/15230430.2021.1994103https://doaj.org/article/66d816bc9bf046a1ba3b35b8b954ad1c2021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/15230430.2021.1994103https://doaj.org/toc/1523-0430https://doaj.org/toc/1938-4246Monitoring wild populations is an essential tool to assess the conservation status and the ecological requirements of a species. Capture–mark–recapture (CMR), based on individual recognition, is the most commonly used and most effective technique. However, in cases of species with no individual color pattern, tracing the encounter history of individuals without invasive marking methods is impossible. In this study we aimed to (1) estimate population abundance and density using a less effort-intensive and nonstressful technique, (2) test a long-term monitoring protocol, and (3) assess the fine-scale ecological requirements of a black-colored amphibian, Salamandra atra, in the Italian Alps. For three populations we applied an N-mixture model on data collected using a dependent double-observer approach. To understand ecological requirements, we assessed the relative importance of a set of environmental and topographical variables. The double-observer approach was a cost-effective technique that provided reliable demographic estimates of population density. Our results suggest that the most important fine-scale ecological variables positively associated with salamander abundance were canopy cover and terrain ruggedness, which are strictly related to shelter availability and soil moisture.Antonio RomanoLuca RonerAndrea CostaSebastiano SalvidioMatteo TrentiPaolo PedriniTaylor & Francis Grouparticleabundance estimationalpsamphibiansdouble observersalamandersEnvironmental sciencesGE1-350EcologyQH540-549.5ENArctic, Antarctic, and Alpine Research, Vol 53, Iss 1, Pp 300-308 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	abundance estimation alps amphibians double observer salamanders Environmental sciences GE1-350 Ecology QH540-549.5
spellingShingle	abundance estimation alps amphibians double observer salamanders Environmental sciences GE1-350 Ecology QH540-549.5 Antonio Romano Luca Roner Andrea Costa Sebastiano Salvidio Matteo Trenti Paolo Pedrini When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander
description	Monitoring wild populations is an essential tool to assess the conservation status and the ecological requirements of a species. Capture–mark–recapture (CMR), based on individual recognition, is the most commonly used and most effective technique. However, in cases of species with no individual color pattern, tracing the encounter history of individuals without invasive marking methods is impossible. In this study we aimed to (1) estimate population abundance and density using a less effort-intensive and nonstressful technique, (2) test a long-term monitoring protocol, and (3) assess the fine-scale ecological requirements of a black-colored amphibian, Salamandra atra, in the Italian Alps. For three populations we applied an N-mixture model on data collected using a dependent double-observer approach. To understand ecological requirements, we assessed the relative importance of a set of environmental and topographical variables. The double-observer approach was a cost-effective technique that provided reliable demographic estimates of population density. Our results suggest that the most important fine-scale ecological variables positively associated with salamander abundance were canopy cover and terrain ruggedness, which are strictly related to shelter availability and soil moisture.
format	article
author	Antonio Romano Luca Roner Andrea Costa Sebastiano Salvidio Matteo Trenti Paolo Pedrini
author_facet	Antonio Romano Luca Roner Andrea Costa Sebastiano Salvidio Matteo Trenti Paolo Pedrini
author_sort	Antonio Romano
title	When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander
title_short	When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander
title_full	When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander
title_fullStr	When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander
title_full_unstemmed	When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander
title_sort	when no color pattern is available: application of double observer methods to estimate population size of the alpine salamander
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/66d816bc9bf046a1ba3b35b8b954ad1c
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When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander

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