Nest-Site Selection by Wood Turtles (<i>Glyptemys insculpta</i>) in a Thermally Limited Environment

Hughes, Geoffrey N.; Greaves, William F.; Litzgus, Jacqueline D.

doi:10.1656/045.016.n302

Cited by 12 publications

(17 citation statements)

References 31 publications

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“…The temperature was then increased by 0.3°C min -1 to 450°C where it remained for 2 h. After 30 h had elapsed, crucibles were removed, cooled in a desiccator and weighed a final time. The weight lost was recorded as organic content (Hughes et al, 2009).…”

Section: Soil Analysesmentioning

confidence: 99%

“…Approximately 50 g of an air-dried soil sample was placed at the top of the stack and put on a sieve shaker for 10 min. Sieves were individually weighed again to determine the amount of soil retained in each (Soil Survey Division Staff, 1993;Hughes et al, 2009). The percentage of soil in each sieve out of the total amount of soil in the stack was calculated, and the Canadian Soil Survey Committee system was used to classify soil types: gravel (≥2 mm grain diameter, percentage in a number 8 sieve), coarse sand (0.5-2 mm grain diameter, percentage in number 16 and 30 sieves), sand (0.15-0.5 mm grain diameter, percentage in number 50, 100 and 200 sieves) and fines (≤0.075 mm grain diameter, percentage that had gone through the number 200 sieve).…”

Section: Soil Analysesmentioning

confidence: 99%

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Potential sources of intra-population variation in painted turtle (Chrysemys picta) hatchling overwintering strategy

Riley

Tattersall

Litzgus

2014

Journal of Experimental Biology

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Many temperate animals spend half their lives in a non-active, overwintering state, and multiple adaptations have evolved to enable winter survival. One notable vertebrate model is Chrysemys picta, whose hatchlings display dichotomous overwintering strategies: some hatchlings spend their first winter aquatically after nest emergence in the autumn, whereas others overwinter terrestrially within their natal nest with subsequent emergence in the spring. The occurrence of these strategies varies among populations and temporally within populations; however, factors that determine the strategy employed by a nest in nature are unknown. We examined potential factors that influence intra-population variation in the overwintering strategy of C. picta hatchlings over two winters in Algonquin Park, Ontario. We found that environmental factors may be a trigger for the hatchling overwintering strategy: autumn-emerging nests were sloped towards the water and were surrounded by a relatively higher percentage of bare ground compared with spring-emerging nests. Autumnemerging hatchlings were also relatively smaller. Overwintering strategy was not associated with clutch oviposition sequence, or mammalian or avian predation attempts. Instead, autumn emergence from the nest was associated with the direct mortality threat of predation by sarcophagid fly larvae. Body condition and righting response, measured as proxies of hatchling fitness, did not differ between overwintering strategies. Costs and benefits of overwintering aquatically versus terrestrially in hatchling C. picta are largely unknown, and have the potential to affect population dynamics. Understanding winter survival has great implications for turtle ecology, thus we emphasize areas for future research on dichotomous overwintering strategies in temperate hatchling turtles.

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Section: Soil Analysesmentioning

confidence: 99%

Section: Soil Analysesmentioning

confidence: 99%

Potential sources of intra-population variation in painted turtle (Chrysemys picta) hatchling overwintering strategy

Riley

Tattersall

Litzgus

2014

Journal of Experimental Biology

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“…Our egg incubation period was similar to ranges reported for natural nests in New Hampshire (76 d; Tuttle and Carroll 1997) and Québec (77-86 d, Walde et al 2007), although variable by year. Hughes et al (2009) recorded a temperature range of 8.5-41.0 °C for five natural nests that produced live hatchlings. Our nest temperatures in 2009 were also highly variable (Table 2, Fig.…”

Section: Hatching Successmentioning

confidence: 99%

“…The largest clutch size yet documented was 20 eggs in a Quebec population (Walde and Saumure 2008). Hughes et al (2009) reported incubation periods of 79-92 d in Ontario, and Walde et al (2007) reported a range of 60-116 d over two years in Québec. Farrell and Graham (1991) recorded emergence of hatchlings from semi-natural nests 70-71 days after laying.…”

Section: Introductionmentioning

confidence: 99%

“…Sex of the offspring is genetically determined, rather than by incubation temperature (Ewert and Nelson 1991). Nesting sites include open sloping areas consisting of welldrained gravelly or sandy soils with sparse-to-no vegetation and are associated with abandoned gravel pits, quarries, roadway embankments, agricultural fi elds, and natural sandy beaches (Castellano et al 2008, Harding and Bloomer 1979, Hughes et al 2009, Walde et al 2007). …”

Section: Introductionmentioning

confidence: 99%

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Use of an Artificial Nesting Mound by Wood Turtles (Glyptemys insculpta): A Tool for Turtle Conservation

Buhlmann

Osborn

2011

Northeastern Naturalist

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Turtles and tortoises losing the race: Ecology and conservation of Testudines in Indawgyi Lake, Myanmar

Kyaw,

Ong,

Naing

et al. 2024

Integrative Conservation

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Testudines (turtles and tortoises) rank among the most threatened vertebrates globally, with species in Asia particularly vulnerable due to exploitation, unregulated trade, habitat loss, and degradation. This study aimed to understand the ecology and conservation status of turtles and tortoises in the Indawgyi Lake basin. We conducted surveys along 47 transects, each 1–2 km in length, across four sampling periods (total distance covered = 74.9 km). Additionally, we also deployed four traps at three different locations to capture turtles during two of these sampling periods. In addition, we analyzed 14 soil samples collected from five locations to determine the nesting conditions of soft‐shell turtles. Finally, we identified conservation concerns through semi‐structured interviews with 146 local households, including fishermen and hunters, to gather local ecological knowledge (LEK) on the abundance, habitats, and breeding ecology of turtles and tortoises, as well as local conservation perspectives. Seven turtle and tortoise species were identified within the Indawgyi Lake basin. To our knowledge, two of these species, the Myanmar brown leaf turtle (Cyclemys fusca) and Oldham's leaf turtle (Cyclemys oldhamii), have yet to be officially documented in this area. Furthermore, an Amyda sp. (collected on 10 March 2019), known by the vernacular name “Late Par Tate,” is hitherto undescribed and is likely a newly discovered species. Our results showed disturbance (SW = 1.0) and higher organic matter (SW = 0.52) as the main estimators explaining the difference in nest observation frequency. Animal grazing areas had more nests than other sites affected by greater human disturbances. The local community identified hunting (44%), fishing (28%), and deforestation (13%) as the main activities threatening turtle and tortoise populations. The majority of turtles hunted were either consumed (over 43%) or sold to middlemen, who at times sold them on to foreign traders (less than 51%). Alarmingly, 99% of those interviewed expressed a notable deficiency in protection and conservation efforts by the Nature and Wildlife Conservation Division and NGOs. We advocate for enhanced conservation efforts, mainly through stronger enforcement, increased awareness, and the establishment of protection zones with restricted human access to facilitate the recovery of these populations, especially at nesting sites.

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Nest-Site Selection by Wood Turtles (Glyptemys insculpta) in a Thermally Limited Environment

Cited by 12 publications

References 31 publications

Potential sources of intra-population variation in painted turtle (Chrysemys picta) hatchling overwintering strategy

Potential sources of intra-population variation in painted turtle (Chrysemys picta) hatchling overwintering strategy

Use of an Artificial Nesting Mound by Wood Turtles (Glyptemys insculpta): A Tool for Turtle Conservation

Turtles and tortoises losing the race: Ecology and conservation of Testudines in Indawgyi Lake, Myanmar

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