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Showing 1 to 20 of 29 for “"Fledging Success"”.
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Sandhill crane colt survival and fledging success in northeastern Illinois: the role of age and significance of land cover in an urbanized landscape
The breeding and fledging success of Sandhill Cranes (Grus canadensis spp.) in urban landscapes has been largely unexplored by previous research. I evaluated survival and habitat use of young Greater Sandhill Cranes (G. c. tabida) in northeastern Illinois, where the Eastern Population of cranes and …
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Selected aspects of common tern reproductive biology
Several factors influencing reproductive success were investigated at a Common Tern colony at Port Colborne, Ontario in 1976. In general three egg clutches hatched better than two egg clutches and early started clutches hatched eggs and fledged chicks better than late clutches; the fledging success …
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Broad reduction and adoption in ring-billed gulls (Larus Delaworensis): the potential for inergenerational conflict
… lack of evidence of a sibling feeding hierarchy. Fledging success in 1987 was greater than in 1988. A "brood reduction strategy" appears to have enabled parents in 1987, to obtain an extra unit of reproductive fitness, while in 1988 parents were often unable to raise the entire brood and third …
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Seasonal variation in the reproductive biology of the ring -billed gull (Larus delawarensis)
… 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 (2.34 ± …
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Reproductive success of a generalist brood parasite predicts the rate of parasitism in the subsequent year
… may be able to improve their own reproductive success with information pertaining to the fledging success of cowbird or host offspring. This, in turn, could influence the laying decisions and host choices of cowbirds in subsequent years. To determine whether host reproductive success and/or …
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Reproductive Peformance of Great Egrets (Ardea alba) at High Island, Texas
… Hurricane Ike at High Island, Texas. Breeding success, productivity, and mean brood size did not differ between years (U-test, P > 0.05). Fledging success at 21 days showed no significant difference between years, however fledging success at 28, 35, and 42 days decreased significantly between …
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Mechanisms underlying population dynamics of a migratory songbird in a fragmented forest
… to fragment size and isolation (low pairing success, area sensitivity, unstable population sizes). I studied the impact of Brown-headed Cowbird (Molothrus ater) brood parasitism and of nest predation on the reproductive success of Wood Thrush (Hylocichla mustelina) hosts in three large …
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The relationship between temperature, rainfall, and tree swallow fledging times
… precipitation are known to affect reproductive success of many avian species. Weather variables can directly or indirectly influence the fledging success of nestlings. I investigated the effect of minimum temperature, maximum temperature, average temperature, maximum rainfall experienced in one …
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Nest-site selection, nocturnal nest desertion, and productivity in a common tern (<i>sterna hirundo</i>) colony at Detroit River, Michigan
… and nest-site. Terns nested later and less successfully in large river rock (13 to 25-cm diameter) compared to more diverse substrate and limestone (2.5-5.0 cm) when it was free of dead vegetation. Within a habitat, terns chose to nest where substrate was most diverse in rock size, soil, and …
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Breeding success, prey use, and mark-resight estimation of burrowing owls nesting on black-tailed prairie dog towns: plague affects a non-susceptible raptor
… effects on prey use, nest density, and breeding success, and used mark-resight methods for owl population estimation. Prairie dogs experience high mortality from plague, and their colonies are periodically extirpated by outbreaks. Plague does not make owls sick, but they may be affected as …
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IMPACTS OF BLOODBORNE PATHOGEN INFECTIONS ON BREEDING ECOLOGY AND SUCCESS IN WHITE-THROATED SPARROWS (Zonotrichia albicollis)
… infections may have negative impacts on nesting success, such as decreased numbers of offspring, hatching probability, and fledging success. In species with multiple reproductive strategies, pathogen infections may have different impacts based on the role of the infected parent. White-throated …
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Breeding Biology of Wilson's Plovers (Charadrius Wilsonia): Reproductive Success, Habitat Use, and Sex Roles
<p>Understanding reproductive success rates and how a breeding pair achieves nest success is vital information needed for management of declining populations. Wilson’s Plover, a species of concern in most of the southeastern United States, has low hatching success on Cumberland Island National …
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The influence of investigator disturbance on aggressive behaviour and breeding success of ring-billed gulls (Larus delawarensis) /
… disturbance on aggressive behaviour and breeding success of individual pairs of ring-billed gulls nesting at two colonies near Port Colborne, Ontario. The insular colony was on an artificial breakwall, associated with the Welland Ship Canal, approximately 1 km off the north shore of Lake Erie. The …
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Reproductive Ecology of Greater Sandhill Cranes in Nevada
… and estimate daily survival rates, nest success, fledging success, and covariates. Daily survival rates (DSRs) of nests were negatively related to density of crane pairs, and positively related to proximity to roads and vegetation height at nests. Low daily minimum temperatures had a …
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Further studies on the breeding biology of redshank (Tringa totanus L.)
… and more likely to hatch last. Nest hatching success varied annually from 30-741, with tidal flooding the main cause of nest failure. In successful nests, hatch success was less variable. Chick size at hatch was positively correlated with egg size. Pre-fledging mortality is discussed in …
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Breeding parameters of great cormorants (Phalacrocorax carbo carbo) at mixed species colonies on Prince Edward Island, Canada
… May and June. Seasonal variation in the breeding success of P. dOJibo individuals was examined at Durell Point in 1977. Mean clutch-size, hatching success and fledging success exhibited a seasonal decline. Four- and 5-egg clutches represented the majority (75%) of all P. CCUibo clutches at Durell …
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Prevalence and impacts of ants colonizing active bird nests in Illinois
… fly larvae and pupae than nests without ants. Fledging success did not differ between nests with and without T. sessile colonies for any bird species. Polydomy and a high degree of nomadism are characteristics which likely predispose ant species like T. sessile to colonizing active bird nests. …
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Predicting Northern Goshawk Dynamics Using an Individual-based Spatial Model
… probability surfaces predicting nest site, post-fledging area, and territory occurrences, although 10,000 or more simulations would produce more reliable probability surfaces. The modeled population was based on demographic data from studies in the Kaibab National Forest, and depicted a declining …
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Predicting Northern Goshawk Dynamics Using an Individual-based Spatial Model
… probability surfaces predicting nest site, post-fledging area, and territory occurrences, although 10,000 or more simulations would produce more reliable probability surfaces. The modeled population was based on demographic data from studies in the Kaibab National Forest, and depicted a declining …
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Biology and conservation of the endangered Bahama Swallow (Tachycineta cyaneoviridis)
… that swallows nesting in pine snags had higher fledging success (92%) than those nesting in utility poles (50-62%). Using a cavity nest-web approach, I assessed how swallows interact with cavity-nesting birds and resources on Abaco. Hairy Woodpeckers (Dryobates villosus) primarily excavated pine …
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