An index for assessing the rare species of a community

Rarity has long been a question of great interest in a wide range of fields. A method to classify rare species should be simple and easy for different professional groups to learn. Rabinowitz is not only easy-to-follow but also one of the most accepted methods to classify rare species. This study pr...

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Autor principal:	Everton A. Maciel
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Rabinowitz Rarity index Conservation biology Ecology index Rare species Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/7e66bf0845a5454ab1d6897c9ca6fab3
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spelling	oai:doaj.org-article:7e66bf0845a5454ab1d6897c9ca6fab32021-12-01T04:45:56ZAn index for assessing the rare species of a community1470-160X10.1016/j.ecolind.2021.107424https://doaj.org/article/7e66bf0845a5454ab1d6897c9ca6fab32021-05-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21000893https://doaj.org/toc/1470-160XRarity has long been a question of great interest in a wide range of fields. A method to classify rare species should be simple and easy for different professional groups to learn. Rabinowitz is not only easy-to-follow but also one of the most accepted methods to classify rare species. This study proposes a rarity index (rr) based on Rabinowitz’s scheme. The index operates at the species level. Given a list of n species, the inverse of the geographical range in decimal degree (geographic range index – gri) of the maximum number of species habitats (habitat specificity index – hsi), and the maximum population size anywhere (population size index – psi) were calculated for each species. An average index rr = med(gri + hsi + psi) was calculated for each species from the gri, hsi, and psi indexes. The rr varies from 0 to 1: the closer rr is to 1, the rarer the species. A code in the R language to calculate each proposed measure is provided. The output of this code is a list of species with their respective indices. RR is useful in the ecology and biodiversity conservation fields. This index has the following advantages: (1) it uses three aspects of rarity to gain a synthetic index; (2) the three parameters have equal weights; and (3) it is easily followed by anyone who feels inclined to use it. Some directions on how it might be used are discussed.Everton A. MacielElsevierarticleRabinowitzRarity indexConservation biologyEcology indexRare speciesEcologyQH540-549.5ENEcological Indicators, Vol 124, Iss , Pp 107424- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Rabinowitz Rarity index Conservation biology Ecology index Rare species Ecology QH540-549.5
spellingShingle	Rabinowitz Rarity index Conservation biology Ecology index Rare species Ecology QH540-549.5 Everton A. Maciel An index for assessing the rare species of a community
description	Rarity has long been a question of great interest in a wide range of fields. A method to classify rare species should be simple and easy for different professional groups to learn. Rabinowitz is not only easy-to-follow but also one of the most accepted methods to classify rare species. This study proposes a rarity index (rr) based on Rabinowitz’s scheme. The index operates at the species level. Given a list of n species, the inverse of the geographical range in decimal degree (geographic range index – gri) of the maximum number of species habitats (habitat specificity index – hsi), and the maximum population size anywhere (population size index – psi) were calculated for each species. An average index rr = med(gri + hsi + psi) was calculated for each species from the gri, hsi, and psi indexes. The rr varies from 0 to 1: the closer rr is to 1, the rarer the species. A code in the R language to calculate each proposed measure is provided. The output of this code is a list of species with their respective indices. RR is useful in the ecology and biodiversity conservation fields. This index has the following advantages: (1) it uses three aspects of rarity to gain a synthetic index; (2) the three parameters have equal weights; and (3) it is easily followed by anyone who feels inclined to use it. Some directions on how it might be used are discussed.
format	article
author	Everton A. Maciel
author_facet	Everton A. Maciel
author_sort	Everton A. Maciel
title	An index for assessing the rare species of a community
title_short	An index for assessing the rare species of a community
title_full	An index for assessing the rare species of a community
title_fullStr	An index for assessing the rare species of a community
title_full_unstemmed	An index for assessing the rare species of a community
title_sort	index for assessing the rare species of a community
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/7e66bf0845a5454ab1d6897c9ca6fab3
work_keys_str_mv	AT evertonamaciel anindexforassessingtherarespeciesofacommunity AT evertonamaciel indexforassessingtherarespeciesofacommunity
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An index for assessing the rare species of a community

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