Pablo R. Delis

Pablo R. Delis
Shippensburg University · Biology Programme

PhD

About

26
Publications
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182
Citations
Introduction
I am a vertebrate biologist, interested in ecology, behavior, morphology, and evolution. My research emphasis is the population biology of amphibians and reptiles. With the use of comparative approaches, I examine morphological, ecological, and behavioral specializations that explain the current demographic status of species and communities. I am working on generating models that predict the fate of species under pressure from human disturbance.

Publications

Publications (26)
Article
Intraguild predation can play a significant role in structuring species composition with intraguild prey under both competitive and predatory pressure from intraguild predators. How intraguild prey are able to persist at sites with their predators is a complex issue with empirical evidence not always supporting theoretical models, indicating a need...
Article
Full-text available
Conservation schemes typically place species into categories, ranging roughly from rare to common or from vulnerable to least concern. Although a species may not be categorized as rare or vulnerable, it still may be sensitive to environmental change and, therefore, at risk of decline. To illustrate the importance of determining species sensitivity,...
Article
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OBJECTIVES: Here, we present the results of a study that used radiotelemetry to track the movements of H. gratiosa adults migrating (see Semlitsch 2008) away from a west-central Florida breeding site. Although this study was conducted in the late 1990s and followed only a small number of individuals at a single site—a problem that is typical for st...
Article
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We examined selected life history traits from 100 specimens of the Green Treefrog, Hyla cinerea, collected during 1938-2012 from mostly coastal counties in Virginia, USA. Individuals were collected during January-October. The highest numbers of males and females were collected in May with most juveniles in June. Testes were at their peak dimensions...
Article
Full-text available
Reproductive characteristics of the Eastern American Toad (Anaxyrus americanus americanus) vary geographically across its broad eastern North American range. Northern populations are known to breed for a shorter period that begins later in the season (April and/or May) than southern populations that can begin in winter and last until April. Delayed...
Article
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Physiological states in snakes, such as digestion, gestation, and ecdysis, have been associated with different body temperatures (BT), yet few studies have examined these associations in a comparative context for wild-caught animals. We collected body and environmental temperatures for 2 natricine snake species—Thamnophis sirtalis (Common Gartersna...
Article
Barrier islands are valuable models for evolutionary and conservation biology studies. Since 2010, we have investigated the herpetofauna of Wallops Island, Virginia, 25 years after a seminal study. We used combinations of taxon-specific field techniques to maximize accuracy. A total of four species of amphibians and seven species of reptiles were i...
Preprint
Full-text available
Barrier islands are valuable models for evolutionary and conservation biology studies. Since 2010, we have investigated the herpetofauna of Wallops Island, Virginia, 25 years after a seminal study. We used combinations of taxon-specific field techniques to maximize accuracy. A total of four species of amphibians and seven species of reptiles were i...
Article
Full-text available
Biotic declines in natural environments are increasing globally, and optimizing management strategies in protected areas may be the best approach to mitigate losses. Researchers should emphasize population-level responses to habitat modification practices in protected areas to ensure portions of the remaining biotas are successfully managed for the...
Article
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An examination of 750 museum specimens of the Southern Leopard Frog (Lithobates sphenocephalus) collected during 1938‐1989 from eastern Virginia (USA) provided comparative life‐history data from the northeastern portion of this species geographic range. Individuals were collected in all months except December. Testis size was largest and incidence...
Article
Reproduction and post-metamorphic growth of the American toad (Anaxyrus americanus) were examined in specimens from agricultural fields in south central Pennsylvania. Males were most fertile during spring and early summer. Females were gravid from April to June and in October prior to brumation. Clutch and body size relationships were indicative of...
Article
Full-text available
Eleven female Jefferson Salamanders (Am bysto majefferso nianum) and five female Spotted Sala-manders (A. m aculatum) were collected during 28 February-17 March 2011 from the same vernal pool in south-central Pennsylvania for comparison of reproductive characteristics. Mean clutch size (169.5 eggs) and relative clutch mass (12.9%) of A. jeffersonia...
Article
Full-text available
ABSTRACT: We ascertained the assemblage structures of snakes occurring in a mixed habitat matrix of natural and disturbed habitats during 2008–2011 at Letterkenny Army Depot (LEAD), a 7200 ha U.S. Army base in south-central Pennsylvania, to understand the patterns of species abundance as they related to habitat type of managed lands. We detected ei...
Article
Full-text available
Seasonal activity, reproduction and post-metamorphic growth were examined in the pickerel frog Lithobates palustris from Pennsylvania using 572 museum specimens collected during 1899-2009 from 66 of 67 counties. Frogs were active from March to November, with a peak in July. Testes were at their maximum dimensions in the fall, and females overwinter...
Article
Full-text available
We surveyed the herpetofauna of the Letterkenny Army Depot (LEAD), Franklin County, in south-central Pennsylvania during May to September of 2003 and 2004, using a variety of techniques: cover boards, drift fences, pit falls, funnel traps, and road cruising. We identified 15 species of amphibians and 14 species of reptiles. The most abundant amphib...
Article
Full-text available
Members of the genus Basidiobolus, a saprophytic fungus, have been associated with the digestive tracts of a wide variety of amphibians and reptiles. To elucidate the relationship of Basidiobolus sp. with amphibians in central Florida (USA), we document the occurrence of the fungus in the digestive tracts of Bufo terrestris, Buffo quercicus, Hyla f...
Article
Full-text available
Recent reports have suggested that a global decline in amphibian populations has taken place during the past few decades. Urban development is thought to affect the richness and abundances of species and, therefore, could be an important cause of decline. We estimated the richness and abundances of anurans in wetlands at a residential development a...
Article
Full-text available
ABSTRACT. Recent reports have suggested that a global decline in amphibian populations has taken place during the past few decades. Urban development is thought to affect the richness and abundances of species and, therefore, could be an important cause of decline. We estimated the richness and abundances of anurans in wetlands at a residential dev...

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Projects

Projects (3)
Project
Monitor conservation status of populations of amphibians and reptiles in Virginia counties, Accomack and Northampton. Long term project in collaboration with VA state agencies.
Project
Research projects focused on characterizing the ecology, reproductive biology, and natural history of reptiles and amphibians in Pennsylvania.