Enigmatic Faunal Declines at La Selva, Costa Rica: Patterns and Processes in a Collapsing Neotropical Herpetofauna

Whitfield, Steven M.

doi:10.25148/etd.fi11072605

Cited by 3 publications

(4 citation statements)

References 128 publications

(166 reference statements)

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“…After severe declines, often to where zero individuals are detected in the wild, several frog species have been re-discovered in areas of Costa Rica with previous records of chytrid, as well as in areas not sampled previously (Whitfield, 2011). Among recent findings we highlight the records for Incilius holdridgei in Central Costa Rica (Abarca et al, 2010), Isthmohyla rivularis in Monteverde (Whitfield, 2011) and Craugastor ranoides in Northwestern Costa Rica Zumbado-Ulate et al, 2011). These findings follow a pattern similar to our finding in that species considered extinct or near-extinct, with recorded massive declines due to chytrid have been rediscovered at previously known locations.…”

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confidence: 91%

“…Though chytrid infection was recorded for A. varius collected in 1993 (Lips et al, 2003) and population declines were confirmed in the area in 1996 (Lips, 1998), some individuals may have exhibited resistance to chytrid infection and persisted, as proposed for the other known locality in Costa Rica (Ryan et al, 2005). Each of these potential explanations requires further understanding of the mechanisms of chytrid fungus spread, the interaction of multiple factors (Whitfield, 2011), both environmental and ecological, and population genetics of the fungus and host.…”

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confidence: 99%

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Renewing hope: the rediscovery of Atelopus varius in Costa Rica

González‐Maya

Belant

Wyatt³

et al. 2013

Amphib Reptilia

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bstract. More than 90% of harlequin frog species (Atelopus spp.), endemic to the Americas, are currently threatened with extinction. We report the discovery of the only currently known hreeding population of the Critically Endangered/4. varius in Costa Rica. This population was located in 2008 on a private property in Las Tablas Protected Zone near San Vito, Coto Brus at 1300 m elevation. Previously, the only known remaining/remnant population of this species and genus was a single location near Manuel Antonio, Puntarenas, Costa Rica, where two individuals were documented in 2004. Subsequent searches at this location have yielded no additional sightings. Delineating the spatial limits of this population, quantifying demographics and resource use, and implementing conservation actions are necessary to ensure persistence of this population. Conducting additional surveys in this region to ascertain occurrence of additional populations is warranted.

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confidence: 91%

mentioning

confidence: 99%

Renewing hope: the rediscovery of Atelopus varius in Costa Rica

González‐Maya

Belant

Wyatt³

et al. 2013

Amphib Reptilia

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“…Además, se ha comprobado que la presencia de agroquímicos causan alteraciones bioquímicas y fisiológicas, incrementando de este modo la mortalidad (e.g. Lajmanovich et al 2004, Peltzer et al 2007, Attademo et al 2011, Whitfield 2011. Asimismo, una mala calidad de los cuerpos de agua, un hidroperiodo reducido (Peltzer et al 2008, Bionda et al 2011b o una menor disponibilidad y tipo de alimento (Bionda et al 2012), también constituyen factores en los agroecosistemas que contribuyen a disminuir la sobrevivencia poblacional.…”

Section: Discussionunclassified

Demografía poblacional de <i>Rhinella arenarum</i> (Anura: Bufonidae) y <i>Physalaemus biligonigerus</i> (Anura: Leiuperidae) en agroecosistemas de la provincia de Córdoba, Argentina

Bionda

Salas

Martino

et al. 2013

RBT

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Population demography in Rhinella arenarum (Anura: Bufonidae) and Physalaemus biligonigerus (Anura: Leiuperidae) in agroecosystems in the province of Córdoba, Argentina. The advancing agricultural frontier has led to an important loss of natural habitats, with significant consequences for biodiversity. The demography for two species of anurans, Physalaemus biligonigerus and Rhinella arenarum, both associated with agricultural systems in the central region of the Córdoba Province, were analyzed and compared in this study. Four sites were sampled: three agroecosystems with different alteration degrees (C1, C2 and SM1) and a fourth site not cultivated (SM2). The sampling was conducted during two reproductive periods, from September 2008 to April 2009 and September 2009 to April 2010. Individuals were captured using live pitfall traps for the metamorphic, juveniles and adults; and visual encounter survey, for the capture of eggs and larvae. With the abundance data, the survival for each age class was estimated using the KNM method (Kiritani Nakasuki Manly). With survival rates and fertility population, Leslie matrices were elaborated to obtain a quantitative projection of the population size. Altered environments showed lower eggs and larvae survival. Population projections were favorable in the site SM2 and were less favorable and a tendency to extinction, in sites dominated by crops. This study showed that the agroecosystems of this region are possibly inhospitable environments for reproduction and survival of the species studied. The aquatic stages in the life cycle of both species would be the more affected, since water bodies deterioration is present or may occur in those areas. We can recognize species-specific effects of agricultural ecosystems; P. biligonigerus was the most affected species, possibly because of their life histories and habitat requirements. We suggested that environmental degradation caused by the cropland in the central region of Argentina would impact on the demographics of the anuran populations in the area.

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“…The effects I detected on the declining litter reptiles and amphibians are especially important at La Selva. Whitfield (2011) and many other researchers at La…”

Section: Reptile and Amphibian Relative Abundancementioning

confidence: 99%

The Effects of Simulated Peccary Extirpation on Leaf Litter Dynamics, Reptiles, and Amphibians in a Neotropical Forest

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Enigmatic Faunal Declines at La Selva, Costa Rica: Patterns and Processes in a Collapsing Neotropical Herpetofauna

Cited by 3 publications

References 128 publications

Renewing hope: the rediscovery of Atelopus varius in Costa Rica

Renewing hope: the rediscovery of Atelopus varius in Costa Rica

Demografía poblacional de <i>Rhinella arenarum</i> (Anura: Bufonidae) y <i>Physalaemus biligonigerus</i> (Anura: Leiuperidae) en agroecosistemas de la provincia de Córdoba, Argentina

The Effects of Simulated Peccary Extirpation on Leaf Litter Dynamics, Reptiles, and Amphibians in a Neotropical Forest

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