Download or read book Effects of Predation by Semipalmated Sandpipers Calidris Pusilla on Vertical Distribution of the Amphipod Corophium Volutator written by Elisabeth H. Wallace and published by . This book was released on 2008 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Foraging Semipalmated Sandpipers Calidris Pusilla L and Their Major Prey Corophium Volutator Pallas on the Starrs Point Mudflat Minas Basin written by John Sherman Boates and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Semipalmated Sandpipers, Calidris pusilla (L.) and their predominant prey, the amphipod Corophium volutator (Pallas) were studied on a macrotidal mudflat ( 6 km2 ) at Starrs Point (45o08'N, 64o22'W), Minas Basin during summer in 1978, 1979 and 1980. The sandpipers stop in this area and store energy prior to a presumed non-stop flight to wintering areas as distant as South America. Bird densities attained over 300/ha and numbers of C. volutator exceeded SO,OOO/m2 locally. Aspects of the amphipod's biology examined include size, energy content, abundance, distribution and behaviour. Collected birds provided information on origins, sex ratio, flight range, fat content and diet. Their distribution, abundance, feeding behaviour and the effects of predation upon C. volutator were also studied. The effects of ingestion rate, prey size and time available for daylight feeding were considered in relation to energy intake, expenditure, fat deposition, and length of stay. Sandpipers fed where their amphipod prey were most abundant. Semi-diurnal tides appeared responsible for behavioural changes of both predation and prey and this factor and the differences in feeding conditions (e.g. daylength and prey availability) contributed greatly to the large cyclic variation in the amount of energy ingested. Fat seemed to be deposited most rapidly over spring tides. Evidence suggesting that the timing of migration is influenced by the same factors was also obtained.

Download or read book Diurnal Versus Nocturnal Activities of Semipalmated Sandpipers Calidris Pusilla and Corophium Volutator on Bay of Fundy Mudflats written by Elizabeth Macdonald and published by . This book was released on 2009 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aspects of the Foraging Ecology of the Semipalmated Sandpiper Calidris Pusilla L in Relation to Its Major Prey Corophium Volutator Palius on the Grande Anse Mudflat Upper Bay of Fundy written by Ian Hamilton and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparing for Long distance Migration written by Dominique Maillet and published by . This book was released on 2006 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fine scale Effects of Prey Density and Interference on Semipalmated Sandpipers Calidris Pusilla in the Upper Bay of Fundy written by Nicholas D.P. Robar and published by . This book was released on 2006 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Foraging Ecology and Body Condition of Migrant Semipalmated Sandpipers Calidris Pusilla on Three Mudflats in the Bay of Fundy Hemispheric Shorebird Reserve Nova Scotia written by Kimberley Mawhinney Gilliland and published by . This book was released on 1992 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Journal of Zoology written by and published by . This book was released on 2000 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Do Wintering Conditions Drive Population Trends in Semipalmated Sandpipers Calidris Pusilla written by Megan L. Boldenow and published by . This book was released on 2018 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some of the most extreme long-distance migrants, Arctic-breeding shorebirds are disproportionately represented in tallies of declining species worldwide. For many shorebirds, including the semipalmated sandpiper (Calidris pusilla), the specific causes and mechanisms behind population declines have not been identified. Stressful conditions affecting birds during wintering are often implicated. Interactions between events and processes occurring in the disparate locations used throughout the annual cycle also may be critical in shaping both individual life histories and population demographics. The main objectives of my graduate research were: a) to examine whether semipalmated sandpipers wintering in specific locations incur differential levels of stress; and b) to test whether stressful conditions may carry over between different stages of an individual’s life cycle. Using measurements of corticosterone (the primary avian stress hormone) deposited in winter-grown feathers, I examined the contribution of breeding season and fall migration to winter-incurred stress, and looked for evidence of carryover effects from wintering conditions to spring migration and subsequent reproductive performance. In Chapter 1, I compared the levels of stress exposure of 40 semipalmated sandpipers that bred at five Arctic sites and spent the austral summer in distinct regions (identified via light-sensing geolocators) across their tropical ‘wintering’ range. I found stress exposure varied by wintering region, and birds using locations along the Atlantic coast of northeastern South America and the Pacific coast of Central America had the highest feather corticosterone levels. I did not find evidence that carryover effects from the breeding season and/or fall migration influenced birds’ physiology during winter. In Chapter 2, I investigated whether greater stress exposure during winter might subsequently affect birds during spring migration and/or breeding. I found that geolocator-tracked birds with increased stress levels delayed spring migration and initiated nests later. However, results for a larger dataset (including 254 birds breeding at seven sites across the North American Arctic) suggested low-stress birds nested later. It is possible the larger dataset included replacement clutches that could have confounded relationships with feather corticosterone, as only birds in better condition are likely to re-nest after clutch failure. In addition, I found evidence that stressful wintering conditions carryover to affect reproductive performance: females that accrued high levels of stress during wintering subsequently laid fewer eggs. In confirmed first nests, we found evidence for a clutch size–egg volume tradeoff, with high-stress females producing fewer offspring but potentially investing more in individual offspring. This research represents the first instance of the feather corticosterone technique being used to compare conditions across the wintering range of a calidrid shorebird and reveals specific wintering locations with high levels of stress exposure. This is also the first research that provides a mechanistic perspective on carryover effects between the wintering and breeding stages in a shorebird, through measurements of feather corticosterone. Finally, by showing that poor environmental conditions at wintering sites far from Arctic breeding areas may be detrimental to the reproductive performance of a species with declining populations, this research emphasizes the importance of considering full annual cycles in conservation and research efforts for migratory species.

Download or read book A Dynamic Model of Semipalmated Sandpiper Migration Implications for Conservation written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: I developed a stochastic dynamic programming model of adult female Semipalmated Sandpiper (Calidris pusilla) spring migration for the purpose of adaptive management of wetlands along their migratory route. Semipalmated Sandpipers are small abundant shorebirds that migrate through Merritt Island National Wildlife Refuge, FL, Yawkey Reserve, SC, Pea Island National Wildlife Refuge, NC, and Delaware Bay on their way from the Caribbean and South America to arctic North American breeding grounds. The first three stopover sites mentioned include managed wetlands. To manage these wetlands for Semipalmated Sandpiper and other migratory shorebirds' fitness by changing water levels to alter food availability, it is important to understand how the birds are using these stopover sites. A stochastic dynamic programming model is a model of organism behavior which assumes that the organism is attempting to optimize its fitness. In this model, the fitness of the birds depends on surviving migration as well as arriving on the breeding grounds close to an optimal date and with sufficient energy reserves. The birds can decide each day whether to stay at the current stopover site and feed, or to fly to the next site. Model parameters include flight constants, ground speed probabilities, energy gain, and predation rates. The values of several parameters were tuned so that average peaks of migration at the stopover sites and average percent fat of the birds on different days and stopover sites correlated well with data taken from published and unpublished studies. The model outcomes include average fitness, seasonal mortality rate, reproductive output, average length of stay at each stopover site, and percentage skimming (not staying to feed) at each stopover site. The peaks of migration matched the targets set. The birds stayed longest at the first and last stopover sites; many birds did not stop to feed at the middle two stopover sites. The average mortality of the spring migration sea.

Download or read book Morphometrics and Distribution of Semipalmated Sandpipers Calidris Pusilla in the Upper Bay of Fundy written by Sydney E. Bliss and published by . This book was released on 2015 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Affecting Movement and Habitat Selection of Semipalmated Sandpipers Calidris Pusilla Linnaeus Migrating Through the Upper Bay of Fundy Canada written by Ashley Jill Sprague and published by . This book was released on 2006 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Movement Patterns of Semipalmated Sandpipers calidris Pusilla and Semipalmated Plovers charadrius Semipalmatus Within Eastern New Brunswick written by Erica Geldart and published by . This book was released on 2018 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Movement Habitat Use and Metabolic Condition of Semipalmated Sandpiper calidris Pusilla During Migratory Stopover and Non breeding Periods written by Rebeca C. Linhart and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Affecting the Breeding Demography of Western Sandpipers Calidris Mauri and Semipalmated Sandpipers C Pusilla at Nome Alaska written by Brett Kevin Sandercock and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1997 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the breeding demography of western sandpipers (Calidris mauri) and semipalmated sandpipers (C. pusilla) at Nome, Alaska, in order to determine sandpiper fecundity and survival rates.

Download or read book Ecology Abstracts written by and published by . This book was released on 2000 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coverage: 1982- current; updated: monthly. This database covers current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Major ares of subject coverage include: Algae/lichens, Animals, Annelids, Aquatic ecosystems, Arachnids, Arid zones, Birds, Brackish water, Bryophytes/pteridophytes, Coastal ecosystems, Conifers, Conservation, Control, Crustaceans, Ecosyst em studies, Fungi, Grasses, Grasslands, High altitude environments, Human ecology, Insects, Legumes, Mammals, Management, Microorganisms, Molluscs, Nematodes, Paleo-ecology, Plants, Pollution studies, Reptiles, River basins, Soil, TAiga/tundra, Terrestrial ecosystems, Vertebrates, Wetlands, Woodlands.

Download or read book Diurnal and Nocturnal Foraging Activities of Semipalmated Sandpipers Calidris Pusilla in the Upper Bay of Fundy written by Melissa Annik Hebert and published by . This book was released on 2011 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: