Toward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.

Due to time and financial constraints indices are often used to obtain landscape-scale estimates of relative species abundance. Using two different field methods and comparing the results can help to detect possible bias or a non monotonic relationship between the index and the true abundance, provi...

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Autores principales:	Denise Güthlin, Ilse Storch, Helmut Küchenhoff
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a4868489939247509bc4a787a21ee9b7
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spelling	oai:doaj.org-article:a4868489939247509bc4a787a21ee9b72021-11-18T08:22:39ZToward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.1932-620310.1371/journal.pone.0094537https://doaj.org/article/a4868489939247509bc4a787a21ee9b72014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24743565/?tool=EBIhttps://doaj.org/toc/1932-6203Due to time and financial constraints indices are often used to obtain landscape-scale estimates of relative species abundance. Using two different field methods and comparing the results can help to detect possible bias or a non monotonic relationship between the index and the true abundance, providing more reliable results. We used data obtained from camera traps and feces counts to independently estimate relative abundance of red foxes in the Black Forest, a forested landscape in southern Germany. Applying negative binomial regression models, we identified landscape parameters that influence red fox abundance, which we then used to predict relative red fox abundance. We compared the estimated regression coefficients of the landscape parameters and the predicted abundance of the two methods. Further, we compared the costs and the precision of the two field methods. The predicted relative abundances were similar between the two methods, suggesting that the two indices were closely related to the true abundance of red foxes. For both methods, landscape diversity and edge density best described differences in the indices and had positive estimated effects on the relative fox abundance. In our study the costs of each method were of similar magnitude, but the sample size obtained from the feces counts (262 transects) was larger than the camera trap sample size (88 camera locations). The precision of the camera traps was lower than the precision of the feces counts. The approach we applied can be used as a framework to compare and combine the results of two or more different field methods to estimate abundance and by this enhance the reliability of the result.Denise GüthlinIlse StorchHelmut KüchenhoffPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 4, p e94537 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Denise Güthlin Ilse Storch Helmut Küchenhoff Toward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.
description	Due to time and financial constraints indices are often used to obtain landscape-scale estimates of relative species abundance. Using two different field methods and comparing the results can help to detect possible bias or a non monotonic relationship between the index and the true abundance, providing more reliable results. We used data obtained from camera traps and feces counts to independently estimate relative abundance of red foxes in the Black Forest, a forested landscape in southern Germany. Applying negative binomial regression models, we identified landscape parameters that influence red fox abundance, which we then used to predict relative red fox abundance. We compared the estimated regression coefficients of the landscape parameters and the predicted abundance of the two methods. Further, we compared the costs and the precision of the two field methods. The predicted relative abundances were similar between the two methods, suggesting that the two indices were closely related to the true abundance of red foxes. For both methods, landscape diversity and edge density best described differences in the indices and had positive estimated effects on the relative fox abundance. In our study the costs of each method were of similar magnitude, but the sample size obtained from the feces counts (262 transects) was larger than the camera trap sample size (88 camera locations). The precision of the camera traps was lower than the precision of the feces counts. The approach we applied can be used as a framework to compare and combine the results of two or more different field methods to estimate abundance and by this enhance the reliability of the result.
format	article
author	Denise Güthlin Ilse Storch Helmut Küchenhoff
author_facet	Denise Güthlin Ilse Storch Helmut Küchenhoff
author_sort	Denise Güthlin
title	Toward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.
title_short	Toward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.
title_full	Toward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.
title_fullStr	Toward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.
title_full_unstemmed	Toward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.
title_sort	toward reliable estimates of abundance: comparing index methods to assess the abundance of a mammalian predator.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/a4868489939247509bc4a787a21ee9b7
work_keys_str_mv	AT deniseguthlin towardreliableestimatesofabundancecomparingindexmethodstoassesstheabundanceofamammalianpredator AT ilsestorch towardreliableestimatesofabundancecomparingindexmethodstoassesstheabundanceofamammalianpredator AT helmutkuchenhoff towardreliableestimatesofabundancecomparingindexmethodstoassesstheabundanceofamammalianpredator
_version_	1718421877790081024

Toward reliable estimates of abundance: comparing index methods to assess the abundance of a Mammalian predator.

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