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A comparison of abundance estimators for small mammal populations Rev. Bras. Zool.
Pacheco,Marcelle; Kajin,Maja; Gentile,Rosana; Zangrandi,Priscilla L.; Vieira,Marcus V.; Cerqueira,Rui.
A major difficulty in the application of probabilistic models to estimations of mammal abundance is obtaining a data set that meets all of the assumptions of the model. In this paper, we evaluated the concordance correlation among three population size estimators, the minimum number alive (MNA), jackknife and the model suggested by the selection algorithm in CAPTURE (the best-fit model), using long-term data on three Brazilian small mammal species obtained from three different studies. The concordance correlation coefficients between the abundance estimates indicated that the probabilistic and enumeration estimators were highly correlated, giving concordant population estimates, except for one species in one of the studies. The results indicate the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic Rainforest; Capture-mark-recapture; Didelphimorphia; MNA; Rodentia.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000200008
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Estimating the relative abundance of small mammals when there is no record of catching effort Rev. Bras. Zool.
Cerqueira,Rui; Kajin,Maja.
ABSTRACT Estimates of local population abundances, which require carefully designed sampling procedures, can provide valuable information on population size and density. Even though small mammals are one of the most widely studied vertebrate groups, many surveys have not recorded basic information to estimate local abundances, for instance catching effort. Here we suggest a simple comparative trapping frequency index that can be used as an alternative to the relative abundance index in data sets that only contain the number of species and individuals collected, thus lacking information on sampling effort. To compare trapping frequency and relative abundances we used capture records from more than four years, from seven species of rodents and two marsupial...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Mammal collections; Population index; Removal; Trapping.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000400325
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Indices of movement behaviour: conceptual background, effects of scale and location errors Rev. Bras. Zool.
Almeida,Paulo J. A. L.; Vieira,Marcus V.; Kajin,Maja; Forero-Medina,German; Cerqueira,Rui.
A fundamental step in the emerging Movement Theory is the description of movement paths, and the identification of its proximate and ultimate drivers. The most common characteristic used to describe and analyze movement paths is its tortuosity, and a variety of tortuosity indices have been proposed in different theoretical or empirical contexts. Here we review conceptual differences between five movement indices and their bias due to locations errors, sample sizes and scale-dependency: Intensity of Habitat use (IU), Fractal D, MSD (Mean Squared Distance), Straightness (ST), and Sinuosity (SI). Intensity of Habitat use and ST are straightforward to compute, but ST is actually an unbiased estimator of oriented search and ballistic movements. Fractal D is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diffusion; Fractal dimension; Oriented search; Random walk; Search behaviour.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500002
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Nine-year demography of the black-eared opossum Didelphis aurita (Didelphimorphia: Didelphidae) using life tables Zoologia
Kajin,Maja; Cerqueira,Rui; Vieira,Marcus V.; Gentile,Rosana.
A population of the black-eared opossum, Didelphis aurita Wied-Neuwied 1826, was studied during 1997-2006 by capture-mark-recapture in the Atlantic Forest in the state of Rio de Janeiro. Cohorts were established with females marked still in the pouch, classified into five age classes. Population parameters were estimated using life tables. Survival was type III and mortality was greatest in age classes I and II, just after weaning. Fecundity was inversely correlated with survival, reproductive value was inversely correlated with mortality and residual reproductive value was inversely correlated with fecundity. The intrinsic rate of increase was always close to zero and tended to be slightly negative. The black-eared opossum can be considered a good model...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic forest; Cohort; Intrinsic factors; Small mammals; Survival.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000200007
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