The Effects of Reproductive and Climatic Seasons on Movements in the Black-Eared Opossum (Didelphis Aurita Wied-Neuwied, 1826)

Loretto, Diogo; Vieira, Marcus Vinícius

doi:10.1644/beh-117.1

Cited by 77 publications

(83 citation statements)

References 34 publications

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“…It was observed that for species that reproduce in a time of lower food availability, females may show a pattern of smaller displacement. In mammals, the greater parental investment lies with the females (TRIVERS 1972, GITTLEMAN & THOMPSON 1988; therefore, the females tend to conserve energy expended in movement, establishing lower home ranges (LORETTO & VIEIRA 2005). In Panamá, for the spiny rat Proechimys semispinosus (Tomes, 1860), ENDRIES & ADLER (2005) observed that individuals of both the sexes had larger home ranges during the rainy season.…”

Section: Discussionmentioning

confidence: 99%

“…After the animal was left to move freely, the line was mapped by measuring the linear distance between two turning points using a measuring tape, and the azimuth was obtained for all the turning points of the line formed by the animal´s movements. Only spools with more than 35 m line mapped were considered for analysis (LORETTO & VIEIRA 2005). For data analysis the initial 20 m were excluded which presumably reflected escape behavior (PIZZUTO et al 2007).…”

Section: Methodsmentioning

confidence: 99%

“…Thus, the total line-distance mapped was initially included in the models as an additional variable (covariate) (DRAPER & SMITH 1998). In the absence of a significant interaction between the covariate and the factors to be tested, the effect of total line-distance mapped was disregarded and the adjustment of the model was executed again (LORETTO & VIEIRA 2005). Many individuals were tracked during both seasons, thus, to analyze the effect of seasonality on the sizes of the DHR, these individuals were represented by the data from one spool obtained in each climatic season.…”

Section: Methodsmentioning

confidence: 99%

“…There have been a number of studies on the use of space by several species using the spool-and-line tracking technique (PREVEDELLO et al 2008, CERBONCINI et al 2011. This technique allows the calculation of total home range of individuals in the traditional sense (CERBONCINI et al 2011) as well the calculation of the "daily home range" (DHR), resulting from the movement of animals during their normal activities in one night (CUNHA & VIEIRA 2002, MENDEL & VIEIRA 2003, LORETTO & VIEIRA 2005, DELCIELLOS et al 2006, ALMEIDA et al 2008, PREVEDELLO et al 2010). This technique is also useful for investigating other characteristics of habitat use by individuals since it allows the mapping of the places where the individuals move.…”

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confidence: 99%

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Use of space by the Neotropical caviomorph rodent Thrichomys apereoides (Rodentia: Echimyidae)

Almeida

Freitas

Talamoni

2013

Zoologia (Curitiba)

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Use of space by the Neotropical caviomorph rodent Thrichomys apereoides (Rodentia: Echimyidae)

Almeida

Freitas

Talamoni

2013

Zoologia (Curitiba)

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“…Consequently, the use of live traps has largely determined the species of small mammals which have been studied, not only in population studies using mark-recapture (e.g. MALCOLM 1991, GRAIPEL et al 2003, MACEDO et al 2006, but also in studies of diet (ATRAMENTOWICZ 1988, CARVALHO et al 1999, vertical stratification (CUNHA & VIEIRA 2002, LORETTO & VIEIRA 2005, locomotion (CANT 1992), and use of space (MORAES JR & CHIARELLO 2005a,b, PREVEDELLO et al 2008.…”

mentioning

confidence: 99%

Artificial nests as an alternative to studies of arboreal small mammal populations: a five-year study in the Atlantic Forest, Brazil

Loretto¹,

Vieira²

2011

Zoologia (Curitiba, Impr.)

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ABSTRACT. Despite the great diversity of Brazilian Atlantic forest small mammals, natural history of most species is unknown due to their cryptic and nocturnal habits, but also due to the inadequacy of methods to capture some species, especially those of arboreal habits. A new technique, based on the use of artificial nests (AN) to record arboreal marsupials, is presented. Artificial nests were combined with traditional live traps to study the population ecology of four didelphid marsupial species. After 62 months of monitoring, 119 individuals were recorded 243 times (total success = 5.2%). Only 26 individuals (22%) were recorded by both AN and live trap methods, and two of the four species were never captured by live traps, only by AN. Live traps alone would have provided biased data of the structure of small mammal assemblages, creating artificial tendencies in population dynamics of many species. Detectability estimates based on mark-recapture data could correct bias resulting from the use only live traps, but these estimates require that at least some individuals of each age class or stage are captured. Only the combination of AN and live traps can produce more accurate data on population dynamics and assemblage structure. This study demonstrates that artificial nests represent a new method that should be combined with live traps in studies of small mammal assemblages and populations.

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Coupled population dynamics of two Neotropical marsupials driven by mesopredator's abundance

2019

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According to the mesopredator release theory, when top predators are eradicated from an area, mesopredators become overabundant. Didelphis aurita is the largest marsupial in the Atlantic Rainforest, and it occurs in higher abundances in the absence of top predators. This mesopredator has similar ecological requirements to the sympatric marsupial Metachirus nudicaudatus. Considering the similar requirements, and that D. aurita is about three times the size of M. nudicaudatus, our hypothesis is that the increase in D. aurita's abundance may negatively affect M. nudicaudatus' population. To test this hypothesis, we conducted a two-year capture-mark-recapture study in an area in the Southeast of Brazil where top predator community is depauperated. The relationship between the population dynamics of these two marsupials was analyzed by including abundance of D. aurita and environmental conditions as explanatory variables of the population parameters of M. nudicaudatus. We observed that all demographic parameters of M. nudicaudatus fluctuated over time and responded negatively to D. aurita abundance. Our conclusion is that, at least on a monthly timescale, the interspecific relationship with D. aurita seems to influence more M. nudicaudatus' population than any other environmental covariate. These findings suggest that mesopredator release can promote negative effects on population parameters of other species within the same trophic level. Considering that top predators are no longer present in most of the remaining Atlantic Rainforest fragments, the marsupial D. aurita has become a key species in this biome, with relevant consequences arising from its interspecific interactions. K E Y W O R D SAtlantic Rainforest, capture-mark-recapture, Didelphis aurita, mesopredator, Metachirus nudicaudatus, POPAN

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The Effects of Reproductive and Climatic Seasons on Movements in the Black-Eared Opossum (Didelphis Aurita Wied-Neuwied, 1826)

Cited by 77 publications

References 34 publications

Use of space by the Neotropical caviomorph rodent Thrichomys apereoides (Rodentia: Echimyidae)

Use of space by the Neotropical caviomorph rodent Thrichomys apereoides (Rodentia: Echimyidae)

Artificial nests as an alternative to studies of arboreal small mammal populations: a five-year study in the Atlantic Forest, Brazil

Coupled population dynamics of two Neotropical marsupials driven by mesopredator's abundance

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