The Nesting of Chelydra serpentina in Northern New York

Petokas, Peter J.; Alexander, Maurice M.

doi:10.2307/1563545

Cited by 42 publications

(25 citation statements)

References 16 publications

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“…Although nest predation seems to be the primary factor in recruitment reduction across a variety of turtle species and regions (Petokas and Alexander 1980;Christens and Bider 1987;Congdon et al 1987;Robinson and Bider 1988;Kolbe and Janzen 2002;Ernst and Lovich 2009), including wood turtles in the western portion of their range (Harding 2008), flooding appears to be the predominant factor in nest destruction in Iowa. Flooding, excessive rainfall, and increased storm events are known to negatively affect hatching success and recruitment across a wide range of turtle species (Ragotskie 1959;Roze 1964;Plummer 1976;Christens and Bider 1987;Van Houtan and Bass 2007).…”

Section: Detriments To Recruitmentmentioning

confidence: 99%

Conservation genetics of a peripherally isolated population of the wood turtle (Glyptemys insculpta) in Iowa

et al. 2010

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The North American wood turtle, Glyptemys insculpta, is a semi-aquatic species that is considered rare, threatened, or endangered over much of its range. In this study, a particularly vulnerable peripheral isolate population in Iowa has been monitored over a period of 7 years. Population census size, estimated from mark-recapture data, and age structure determined from morphology are compared with genetic variation assessed using microsatellites. For reference, the genetics and demographics of this peripheral isolate are compared to data from a more dense population nearer the core of the species range in West Virginia. Geneflow between the Iowa population and a nearby population in Minnesota also is assessed. Genetic data indicate that the Iowa population is isolated, unique, and diverse. Although the Iowa population has lower allelic richness, lower heterozygosity, and smaller genetic effective population size than does the West Virginia population, the difference is not dramatic despite its lower population size, position at the periphery of the species range, and biogeographic history. The Iowa population is not inbred, and there is no genetic signature of a recent population bottleneck. However, interpretations of recent population dynamics based on genetic data may be unduly encouraging in long-lived species such as G. insculpta. Field data suggest a nearly complete lack of recruitment in Iowa. A number of environmental and anthropogenic factors, including recent increases in summer flooding during egg incubation, may have a more negative impact on the Iowa population than on the West Virginia population.

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Section: Detriments To Recruitmentmentioning

confidence: 99%

Conservation genetics of a peripherally isolated population of the wood turtle (Glyptemys insculpta) in Iowa

et al. 2010

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“…Instead, we infer that the increased visual and olfactory detectability of snapping turtle nests renders them more likely to be encountered by opportunistic predators. Other Weld investigations have also shown that painted turtles experience lower nest predation rates [mean: »36% (range: 0-77%); Tinkle et al 1981;Snow 1982;Lindeman 1991;Kolbe and Janzen 2002;Congdon et al 2003;Bowen and Janzen 2005;Rowe et al 2005] than snapping turtles [mean: »77% (range: 59-94%) ;Hammer 1969;Petokas and Alexander 1980;Congdon et al 1987]. By implication, the putatively heightened crypsis of painted turtle nests apparently lowers their susceptibility to predation relative to snapping turtle nests across a broad range of conditions.…”

Section: Discussionmentioning

confidence: 95%

“…Turtle nests in PPNP are potentially subject to predation by a variety of species including coyote (Canis latrans), red fox (Vulpes vulpes), striped skunk (Mephitis mephitis), and Virginia opossum (Didelphis virginiana). However, the primary predators of turtle nests in PPNP are raccoons (Browne and Hecnar 2007), which are generalist feeders known to forage intensively along freshwater shorelines (Llewellyn and Uhler 1952) and that commonly attack nests of a variety of freshwater chelonians (e.g., Petokas and Alexander 1980;Congdon et al 1987;Marchand and Litvaitis 2004) and ground-nesting birds (e.g., Zoellick et al 2004;Ellis et al 2007). Raccoon densities in PPNP are higher than those that typify rural Ontario (Browne and Hecnar 2007).…”

Section: Study Sitementioning

confidence: 99%

Incidental nest predation in freshwater turtles: inter- and intraspecific differences in vulnerability are explained by relative crypsis

et al. 2011

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There has long been interest in the influence of predators on prey populations, although most predator-prey studies have focused on prey species that are targets of directed predator searching. Conversely, few have addressed depredation that occurs after incidental encounters with predators. We tested two predictions stemming from the hypothesis that nest predation on two sympatric freshwater turtle species whose nests are differentially prone to opportunistic detection-painted turtles (Chrysemys picta) and snapping turtles (Chelydra serpentina)-is incidental: (1) predation rates should be density independent, and (2) individual predators should not alter their foraging behavior after encountering nests. After monitoring nest survival and predator behavior following nest depredation over 2 years, we confirmed that predation by raccoons (Procyon lotor), the primary nest predators in our study area, matched both predictions. Furthermore, cryptic C. picta nests were victimized with lower frequency than more detectable C. serpentina nests, and nests of both species were more vulnerable in human-modified areas where opportunistic nest discovery is facilitated. Despite apparently being incidental, predation on nests of both species was intensive (57% for painted turtles, 84% for snapping turtles), and most depredations occurred within 1 day of nest establishment. By implication, predation need not be directed to affect prey demography, and factors influencing prey crypsis are drivers of the impact of incidental predation on prey. Our results also imply that efforts to conserve imperiled turtle populations in human-modified landscapes should include restoration of undisturbed conditions that are less likely to expose nests to incidental predators.

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“…Alguns autores discordam da influência das características físicas das praias na escolha dos locais de desova de tartarugas marinhas (Stancyk & Ross, 1978) e de tartarugas de água doce (Petokas & Alexander, 1980;Pezzuti & Vogt, 1999) ou no sucesso da eclosão ou na razão sexual dos filhotes (Maxwell et al, 1988). Porém mesmo que a temperatura de incubação dos ninhos de tartaruga marinha varie pouco nos ambientes tropicais (Spotila et al, 1987;Mrosovsky et al, 1984), já que a profundidade e os locais escolhidos pelas fêmeas minimizam os efeitos do ambiente (Binckley et al, 1998), é inegável a influência que o local de desova terá no sucesso da eclosão (Ferreira Júnior et al, 2003b;Ferreira Júnior & Castro, 2005) e na razão sexual dos filhotes (Hays et al, 2001).…”

Section: Influência Das Características Dos Ninhos No Desenvolvimentounclassified

Aspectos ecológicos da determinação sexual em tartarugas

Júnior

2009

Acta Amaz.

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ResumoOs aspectos ecológicos relacionados à reprodução das tartarugas e de outros répteis que apresentam determinação sexual dependente da temperatura de incubação desempenham um papel crucial no equilíbrio das populações. Nestas espécies a razão sexual dos filhotes é controlada pela temperatura a que os ovos são submetidos durante a incubação. Entender como as características do local da desova afetam a temperatura da incubação é essencial para que se possa argüir sobre os fatores que controlam a ecologia, a reprodução e a distribuição geográfica das tartarugas. Este trabalho de revisão aborda o modo de reprodução das tartarugas e a maneira como a reprodução é afetada pelo meio físico.PalavRas-chave: quelônio, reprodução, nidificação, incubação, sedimento Ecological aspects of turtle sex determination abstRactThe ecological aspects related to the reproduction of turtles and other reptiles, which present incubation temperature-dependent sex determination, play a crucial role in their population equilibrium. For such species, the sex ratio of hatchlings is controlled by the nest temperature during incubation. To understand how the nest site characteristics affect temperature is essential for considering the factors which control the ecology, reproduction and distribution of turtles. In this paper, we have made a review on the way turtles reproduce and how the physical environment affects reproduction.

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The Nesting of Chelydra serpentina in Northern New York

Cited by 42 publications

References 16 publications

Conservation genetics of a peripherally isolated population of the wood turtle (Glyptemys insculpta) in Iowa

Conservation genetics of a peripherally isolated population of the wood turtle (Glyptemys insculpta) in Iowa

Incidental nest predation in freshwater turtles: inter- and intraspecific differences in vulnerability are explained by relative crypsis

Aspectos ecológicos da determinação sexual em tartarugas

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