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Showing 1 to 20 of 69 for “"hatching success"”.
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Gopher tortoise nest-site selection at burrows and the influence of nest environment on hatching success
… nest sites, and how those nest sites impact hatching success, may be important for successful species conservation. In this research, my objective was to 1) understand how the environment around potential nest sites (canopy, understory, and soil) influences gopher tortoise nest-site selection …
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The effect of beach renourishment on sea turtle nesting and hatching success at Sebastian Inlet State Recreation Area, East-Central Florida
… to investigate nesting behavior, reproductive success and physical characteristics of the nesting habitat on the renourished beach at Sebastian Inlet and on a control beach (Wabasso Beach). Daily nesting surveys were conducted to record all sea turtle nests and non-nesting emergences in each …
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Etude des facteurs écologiques et écotoxicologiques impliqués dans la réussite d’incubation chez la tortue luth, Dermochelys coriacea, de Guyane Française
… Dermochelys coriacea, have relatively low hatching success in comparison to other marine turtle species. This low hatching rate is largely a result of high embryonic mortality rather than infertility, but the specific causes remain unknown. Leatherbacks are vulnerable to excessive adult …
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Reproductive Ecology and Hatchling Behavior of Olive Ridley Sea Turtles in Honduras
… The second study compared thermal profiles, hatching success, and hatchling characteristics of nests left in situ on the beach with nests from a local hatchery. I also assessed the effects of retaining hatchlings for 24 hours after emergence. Incubation temperatures were higher, and hatching …
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Hatching synchrony and survival in early life in the painted turtle, Chrysemys picta
… avoidance strategy. In turtles, synchronous hatching promotes synchronous emergence from the nest and may limit predation by swamping and confusing predators or simply dilute the per capita risk of predation. However, synchronization of hatching in natural nests is complicated by the …
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Seasonal variation in the reproductive biology of the ring -billed gull (Larus delawarensis)
… as a result of reductions in mean clutch size, hatching success and fledging success with date of clutch initiation. Seasonal changes in mean clutch size, hatching success and fledging success also resulted in early clutches, initiated at the peak of clutch starts, producing more chicks per nest …
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The effects of intensive agriculture on the breeding of the lapwing (Vanellus vanellus L.).
… and did not differ significantly between years. Hatching success was highest in RSA (88%), lowest in spring farmed fields (48.4%) and intermediate in winter farmed fields (57.2%). Hatching success was significantly higher in spring farmed fields than in other habitats but did not differ …
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Fungal Control Methods, Diets and Water Temperatures Used to Culture Paddlefish, Polydon spathula
… young, and the effects that fungicides have on hatching success and fry survival. The W-7 cool water diet was fed hourly and three times daily while the Liv commercial diet was fed hourly to paddlefish young for 40 days after swim-up. Average survival rate and total length of paddlefish fed W-7 …
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Conservation Genetics of Threatened Gopher Tortoises, <i>Gopherus polyphemus</i>: An Assessment of Genetic Variation and Parentage in Two Populations in South Mississippi
… Mississippi experience low recruitment and lower hatching success than populations in the eastern portion of the range, and the causes of this are unknown. Previous work has shown that Mississippi populations of the DNF have lower levels of genetic diversity than eastern populations, which …
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Maternal Effects and Offspring Behavior: Potential Contributors to the Lack of Recruitment in Mississippi Gopher Tortoises (<i>Gopherus polyphemus</i>)
… recruitment and are generally in decline. Hatching success is significantly lower in Mississippi than in any other part of the species’ range , and most hatchlings die within the first year. There are few refuges where survival and hatching success is high. Here I compare two populations …
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The effects of ultraviolet-B radiation on antioxidant status and survival in the zebrafish.
… zebrafish (Brachydanio rerio) and on their hatching success and survival in early life stages was measured. Exposure of mature fish to sub-ambient doses of UV-B radiation both in the presence (1.28 W/m$\sp2$) and absence (1.72 W/m$\sp2$) of a cellulose acetate filter (blocks all wavelengths …
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Female Dispersal and Inbreeding in the Red-cockaded Woodpecker
… (kinship coefficient greater than 0.1) had lower hatching success as well as lower survival and recruitment of fledglings than unrelated pairs. Moderately related pairs (kinship coefficient between 0 and 0.1) and moderately inbred individuals had increased hatching success, but did not produce …
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Nesting Ecology of the Ring-necked Pheasant in Eastern South Dakota
… Brookings County. Nest initiation and hatching peaks over the 2-year period occurred from 1-15 may and 16-30 June, respectively. Average density of nests was 0.3 per hectare in 1973 and 0.2 in 1974. Average clutch size for combined years was 8.6 for all nests and 10.8 for nests where …
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Effects of pumped storage project operations on the spawning success of centrarchid fishes in Leesville Lake, Virginia
… Mountain Pumped Storage Project on the spawning success of centrarchid fishes in the lower impoundment, Leesville Lake. Hydroelectric power generation operations at the Smith Mountain Dam power plant create high water velocities with daily flow reversals, and water level and temperature …
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Factors impacting the breeding success of African penguins Spheniscus demersus on Robben Island
… that have the potential to affect breeding success of African penguins; body mass at the onset of breeding and the suitability of various nest types to mitigate changing climatic conditions. Body mass was measured by recording weights using an automated weighing scale set up in front of a …
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Mercury Bioaccumulation and Adverse Reproductive Effects in Snapping Turtles Inhabiting a Historically Contaminated River
… decrease survival, and reduce reproductive success. Unfortunately, most ecotoxicology studies euthanize animals to quantify the concentrations of Hg bioaccumulation and in doing so eliminate the ability to relate Hg accumulation to observed effects. The development of non-destructive …
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Multiple Paternity of Caretta Caretta within the Northwestern Atlantic Ocean Population on Wassaw Island, Ga
… size (straight carapace length), as well as hatching success and to determine how many males are actually contributing to this nesting population. Mothers and offspring (up to 20) were initially sampled from more than 90 nests over three nesting seasons on Wassaw Island, GA (2008-2010). We …
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Resurrection ecology of invertebrates in temporary wetlands in the Cape Floristic region: effects of urbanisation and fire
… the functioning and health of these systems. The hatching success of invertebrate propagules in dried soil sediments, collected from temporary wetlands in Cape Sand Fynbos regions of Cape Town, were investigated in 2016. Soil samples were collected from conserved and urban sites (during May and …
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Invertebrate Egg and Plant Seed Banks in Natural, Restored, and Drained Wetlands in the Prairie Pothole Region (USA) and Potential Effects of Sedimentation On Recolonization of Hydrophytes and Aquatic Invertebrates
… Pothole Region (PPR). Sediment may impact the success of wetland restorations because burial of invertebrate and plant propagules may impact hatching and germination success, and hence, may hamper successional changes throughout interannual climate cycles. Sedimentation also reduces the pool …
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Distribution and Productivity of Least Terns and Piping Plovers Along the Missouri and Cheyenne Rivers in South Dakota
… to determine the distribution and reproductive success of least terns and piping plovers on the Missouri and Cheyenne rivers in South Dakota. All suitable habitat was surveyed, with research concentrated on two important areas: 1) the Missouri River from Fort Randall Dam to Springfield, SD, and …
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