A Review of the European Pond Turtle, &lt;i&gt;Emys orbicularis&lt;/i&gt; (Testudines: Emydidae), as a Subject for Integrative Population Studies

Ota, Hidetoshi

doi:10.5358/hsj1972.18.1_30

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…Europe: European Pond Turtles ( Emys orbicularis ) are now rare or extirpated in 20 of 22 European countries in which they occurred (Drobenkov 2014). Hooded Crows ( Corvus cornix ) are egg predators of European Pond Turtles across sizable portions of the geographic range: Italy (Zuffi 2004), Poland (Ota 1999), Belarus (Drobenkov 2014), Romania (Sos 2009), Slovenia (Vamberger and Kos 2011), Ukraine (7.1% of nest predation events; Kotenko 2000). In Belarus, hatchling European Pond Turtles (listed as nationally threatened) are preyed on by Northern Ravens and Hooded Crows during overland dispersal (Drobenkov 2014).…”

Section: Resultsmentioning

confidence: 99%

Hyperpredation of Freshwater Turtles and Tortoises by Subsidized Corvids

Moldowan

2023

Herpetological Monographs

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Subsidized predators are animals whose populations proliferate through association with humans. As subsidized predators, birds in the family Corvidae (Corvus spp., crows and ravens) pose an additive mortality threat to turtle eggs, juveniles, and, in some cases, adults. In this synthesis, I (1) review published and unpublished case studies of corvids as predators of chelonians, (2) examine regional population trends of corvids relative to the status of co-occurring chelonian species, and (3) evaluate our current understanding of subsidized corvids as threats to chelonians. Hyperpredation of chelonians by corvids is geographically widespread, locally severe where and when predation occurs, facilitated by anthropogenic subsidies (e.g., food, water, and perching, nesting, and roosting sites) and linear corridors (e.g., roads, electrical infrastructure), commonly associated with nesting corvids as predators, and co-occurring with corvid population increases. Hyperpredation by corvids appears to affect demographically sensitive stages of chelonian populations (juveniles and reproductive females) and very likely has long-term detrimental consequences given the slow life history of chelonians. The threat posed to chelonian populations by subsidized corvids is more widespread than currently recognized on the basis of substantial regional increases in corvid populations, the underreporting of predation observations, and the broad geographic areas over which hyperpredation of chelonians is occurring.

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Section: Resultsmentioning

confidence: 99%

Hyperpredation of Freshwater Turtles and Tortoises by Subsidized Corvids

Moldowan

2023

Herpetological Monographs

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“…Data on life history and ecology of this species has increased over the last few decades (cf. Ota, 1999;Hödl and Rössler, 2000;Eritz, 2003). However, as for many freshwater turtles, most of the information on the early life history stages of E. orbicularis is focused on data concerning clutch size and hatching success (e.g.…”

Section: Introductionmentioning

confidence: 95%

Migrations of hatchling European pond turtles (Emys orbicularis) after nest emergence

Najbar

Mitrus

2013

Amphib Reptilia

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Distances between nest sites of Emys orbicularis and the nearest water bodies can be long. We studied whether a longer distance could affect the probability of hatchling survival, migration time, and body mass loss. In our research area (Lubuskie district, westem Poland), nest sites were situated on a slope; the closest water body was in a distance of 72-290 m. Near the water body we constructed a 550 m long drift fence to recapture hatchlings migrating down the slope. We monitored 32 hatchlings from 7 different nests deposited in the years 2008-2010. The hatchlings started to emerge from their nests on 9 . Then, hatchlings were radiotracked using transmitters glued on their carapaces. Individuals (n = 20) recaptured near the fence travelled the distance between the nest site and the fence within 18-727 hours (O.75-~3O days). Hatchlings from nests situated only a short distance away (72-81 m) were recaptured in higher numbers, compared to those from nests situated further away (227-290 m). During the journey the hatchlings lost on average ~3.8% of their initial body mass. The hatchlings which migrated longer lose more of their initial body mass than those which migrated shorter.

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A Review of the European Pond Turtle, <i>Emys orbicularis</i> (Testudines: Emydidae), as a Subject for Integrative Population Studies

Cited by 2 publications

References 16 publications

Hyperpredation of Freshwater Turtles and Tortoises by Subsidized Corvids

Hyperpredation of Freshwater Turtles and Tortoises by Subsidized Corvids

Migrations of hatchling European pond turtles (Emys orbicularis) after nest emergence

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