Download or read book The oystercatcher haematopus ostralegus as a predator of the bi written by Jan Bote Hulscher and published by . This book was released on 1982 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Oystercatcher Haematopus Ostralegus as a Predator of the Bivale Macoma Balthica in the Dutch Wadden Sea written by J. B. Hulscher and published by . This book was released on 1981 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Oystercatcher Haematopus Ostralegus as a Predator of the Bivalve Macoma Balthica in the Dutch Wadden Sea written by Jan Bote Hulscher and published by . This book was released on 1981 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oystercatchers and Shellfish written by John Goss-Custard and published by . This book was released on 1977-01-01 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Predation by the oystercatcher Haematopus ostralegus L in relation to the cockle Cerastoderma edule L fishery in the Burry Inlet South Wales written by J W. Horwood and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Causes of variation in prey profitability and its consequences for the intake rate of the oystercatcher Haematopus ostralegus written by L. Zwarts and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Foraging behaviour of oystercatchers Haematopus ostralegus specialising on different species of prey written by J S. Boates and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Adult oystercatchers Haematopus ostralegus specializing on four prey species, the mussel Mytilus edulis, the winkle Littorina littorea, the ragworm Nereis diversicolor, and the clam Scrobicularia plana, were compared. Some clear trends from mussels to winkles to clams to worms were identified. First, mean biomass (size) of prey decreased but more prey were attacked per unit time and, since fewer attacks were aborted, more prey were actually captured per unit time. Second, handling time decreased, and birds raised their heads less often while handling a prey item and carried prey less frequently. Third, foraging density, attack rate, and avoidance rate all decreased. However, average rates of food intake did not follow the same order and were inconsistent with the expected preference for prey. The greatest intake rate was achieved by birds specializing on clams, the least preferred prey. The rate of intake of mussels, the most preferred prey, was significantly lower. Alternatives to the energy rate maximization model to explain prey preference are discussed and dismissed. The results of this study contrast with those from several studies on prey-size selection within a single prey species, which show that oystercatchers prefer prey that maximize their intake rates. We suggest that the basis for selecting a prey species and for selecting different size classes within one prey species may be quite different.

Download or read book Prey Choice and Habitat Use by Foraging Black Oystercatchers written by Gary Anthony Falxa and published by . This book was released on 1992 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Predator Control and Habitat Type on American Oystercatcher Haematopus Palliatus Reproductive Success written by Jessica J. Stocking and published by . This book was released on 2012 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vigilance during food handling by Oystercatchers Haematopus ostralegus reduces the chances of losing prey to kleptoparasites written by J. Goss-Custard and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Oystercatchers Haematopus ostralegus periodically pause while handling mussels Mytilus edulis to make visual scans. This paper presents evidence that scanning is associated with the high incidence of intra-specific food stealing among mussel-eating Oystercatchers. Scanning increased in frequency as bird density - and the risk of being attacked for mussels - increased and the duration of attacks decreased. Additionally, among a sample of individually marked adults, the aggressive dominant birds spent half as much time scanning as the less aggressive subdominants and were also less likely to be attacked. Whereas detecting an attack made no difference to the success with which the dominants defended their mussels, subdominants increased their chances of retaining the mussel if they detected and carried the mussel away from the approaching attacker. The extra time which the less aggressive birds spent in vigilance seems best understood as a tactic for reducing food loss to kleptoparasites.

Download or read book Egg Predation in Oystercatchers Haematopus Ostralegus Imperfect Nestdefence Or Human Disturbance written by Nanette Verboven. and published by . This book was released on 1990 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Feeding Behaviour of the Oystercatcher Haematopus Ostralegus written by M. Norton-Griffiths and published by . This book was released on 1968 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Foraging and Social Behavior of the Oystercatcher Haematopus Ostralegus in Relation to Diet Specialization written by John Sherman Boates and published by . This book was released on 1988 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The effect of oystercatchers Haematopus ostralegus on shellfish populations written by J. Goss-Custard and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper discusses the contrasting effect of Oystercatchers, in combination with other predators, on the dynamics of a mussel Mytilus edulis and a cockle Cerastoderma edule population On the Exe estuary, a plentiful supply of young (spat) Mussels seem only able to settle successfully, and survive their first winter, amongst the byssus threads of already established adults (> 1-year olds), where they are probably protected against predation by crabs Carcinus maenas. So more spat reach adulthood where adults are already numerous. By removing up to 30% of the large Mussels in winter, Oystercatchers may reduce the protected space available to young Mussels, unless the growth rates of the remaining Mussels are thereby sufficiently enhanced to compensate for the loss. In direct contrast, a study by Hancock (1971, 1973) of Cockles in the Burry Inlet showed that settlement of a plentiful supply of spat was reduced at high densities of adults. Although this association may have arisen, in part, because crib predation is lower in years of low adult density, the effect of Oystercatchers on spat settlement in this shellfish was directly opposite to that which they had on Mussels in the Exe estuary, enabling more spat Cockles to settle and survive. In other populations of both species, where spat shellfish settle in different places to adults, Oystercatchers will have little influence on recruitment. On the other hand, Oystercatchers are likely to affect in most populations the abundance of the large shellfish, upon which both they and commercial shellfisheries mainly depend.

Download or read book Foraging and Social Behaviour of the Oystercatcher Haematopus Ostralegus in Relationship to Diet Specialization written by J. S. Boates and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Foraging and Social Behaviour of the Oystercatcher Haematopus Ostralegus in Relation to Diet Specialization written by J. Sherman Boates and published by . This book was released on 1988 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution to the Knowledge of the Behaviour of the Oyster catcher Haematopus Ostralegus L written by G. F. Makkink and published by . This book was released on 1942 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: