Sex‐ and context‐dependent migration in a pond‐breeding amphibian

Grayson, Kristine L.; Wilbur, Henry M.

doi:10.1890/08-0935.1

Cited by 73 publications

(86 citation statements)

References 34 publications

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“…However, analyses of coupled data of animal movement and environmental variables in a unified framework are still lacking. Movement analyses of different taxa and species, such as mammals, birds, insects and amphibians, has largely been developed independently (Fryxell & Sinclair 1988, Alerstam et al 2003, Grayson & Wilbur 2009). Also, movements at different spatial scales are often explained by different mechanisms such as migration versus feeding (Dingle 1996(Dingle , 2006.…”

Section: Scales Of Environmental Change and Animal Movementmentioning

confidence: 99%

The Normalized Difference Vegetation Index (NDVI): unforeseen successes in animal ecology

Pettorelli¹,

Ryan²,

Mueller³

et al. 2011

Clim. Res.

638

508

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This review highlights the latest developments associated with the use of the Normalized Difference Vegetation Index (NDVI) in ecology. Over the last decade, the NDVI has proven extremely useful in predicting herbivore and non-herbivore distribution, abundance and life history traits in space and time. Due to the continuous nature of NDVI since mid-1981, the relative importance of different temporal and spatial lags on population performance can be assessed, widening our understanding of population dynamics. Previously thought to be most useful in temperate environments, the utility of this satellite-derived index has been demonstrated even in sparsely vegetated areas. Climate models can be used to reconstruct historical patterns in vegetation dynamics in addition to anticipating the effects of future environmental change on biodiversity. NDVI has thus been established as a crucial tool for assessing past and future population and biodiversity consequences of change in climate, vegetation phenology and primary productivity.

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Section: Scales Of Environmental Change and Animal Movementmentioning

confidence: 99%

The Normalized Difference Vegetation Index (NDVI): unforeseen successes in animal ecology

Pettorelli¹,

Ryan²,

Mueller³

et al. 2011

Clim. Res.

638

508

View full text Add to dashboard Cite

show abstract

“…We believe nearly all adults in our population overwintered in the pond, based on lack of emigrants in late summer and few captures of immigrating adults in March−April (in contrast to migratory populations studied by Gill 1978 andGrayson &Wilbur 2009). Seasonal variation in food availability could potentially explain the large increase in newt SMI between March and April followed by a decline in May.…”

Section: Co-infection and Effects Of Bd And Rv In Newtsmentioning

confidence: 90%

“…Because we did not monitor the newt population yearround, we are uncertain if all adults overwintered in the pond, or whether some individuals overwintered in terrestrial habitats, as in some populations of this species (Gill 1978, Grayson & Wilbur 2009). The 23 unmarked adults that immigrated in March−June 2010 may have been migratory adults that overwintered on land, adult dispersers from other ponds, or first-time breeders.…”

Section: Implications For Disease Dynamics and Population Persistencementioning

confidence: 99%

Disease dynamics of red-spotted newts and their anuran prey in a montane pond community

Rothermel

Miller²,

Travis³

et al. 2016

Dis. Aquat. Org.

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Long-term monitoring of amphibians is needed to clarify population-level effects of ranaviruses (Rv) and the fungal pathogen Batrachochytrium dendrobatidis (Bd). We investigated disease dynamics of co-occurring amphibian species and potential demographic consequences of Rv and Bd infections at a montane site in the Southern Appalachians, Georgia, USA. Our 3-yr study was unique in combining disease surveillance with intensive population monitoring at a site where both pathogens are present. We detected sub-clinical Bd infections in larval and adult redspotted newts Notophthalmus viridescens viridescens, but found no effect of Bd on body condition of adult newts. Bd infections also occurred in larvae of 5 anuran species that bred in our fishless study pond, and we detected co-infections with Bd and Rv in adult newts and larval green frogs Lithobates clamitans. However, all mortality and clinical signs in adult newts and larval anurans were most consistent with ranaviral disease, including a die-off of larval wood frogs Lithobates sylvaticus in small fish ponds located near our main study pond. During 2 yr of drift fence monitoring, we documented high juvenile production in newts, green frogs and American bullfrogs L. catesbeianus, but saw no evidence of juvenile recruitment in wood frogs. Larvae of this susceptible species may have suffered high mortality in the presence of both Rv and predators. Our findings were generally consistent with results of Rv-exposure experiments and support the purported role of red-spotted newts, green frogs, and American bullfrogs as common reservoirs for Bd and/or Rv in permanent and semi-permanent wetlands.

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“…Not only has the migration and dispersal of animals, such as birds, insects, and fish, been a popular topic to study, but also the migration and dispersal of plants (seed dispersal) and tissue, blood, and cancer cells are being studied [7,[10][11][12]15,20,24]. In the last few decades, ecologists and mathematicians have been interested in the dispersal of amphibian populations ( [4,5,13,[16][17][18]22,23] just to name a few).…”

Section: Introductionmentioning

confidence: 99%

A discrete dispersal model with constant and periodic environments

Ackleh

Chiquet

Zhang

2011

Journal of Biological Dynamics

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We study a discrete juvenile-adult model which describes the dynamics of a population that reproduces and disperses between two patches constantly or seasonally. When breeding and dispersal rates are constant, the model has a unique interior equilibrium that is globally attractive, provided the net reproductive number is greater than one. If net reproductive number is less than one, then the extinction equilibrium is globally asymptotically stable. When breeding and dispersal rates are periodic of period 2, the extinction equilibrium is globally asymptotically stable if the net reproductive number is less than one. If the net reproductive number is greater than one, then there exists a unique globally attractive periodic solution. We then use bifurcation analysis to compare constant and seasonal breeding strategies, to explore the effects of different birth and dispersal periodicities and to understand the influence of strong nonlinearities on the dynamics of the model.

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Sex‐ and context‐dependent migration in a pond‐breeding amphibian

Cited by 73 publications

References 34 publications

The Normalized Difference Vegetation Index (NDVI): unforeseen successes in animal ecology

The Normalized Difference Vegetation Index (NDVI): unforeseen successes in animal ecology

Disease dynamics of red-spotted newts and their anuran prey in a montane pond community

A discrete dispersal model with constant and periodic environments

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