Ruddy Turnstone (Arenaria interpres) Science Article 8 abstract In this study we analyse biometrical data of 69 adult and 389 juvenile Turnstones Arenaria interpres caught during autumn migration when passing through the Gulf of Gdansk in the period 1983-1999. Adults had significantly longer wings than juveniles. WLODZIMIERZ MEISSNER and LESZEK KOZIROG, ORNIS SVECICA 11:181-188, 2001 […]

Ruddy Turnstone (Arenaria interpres) Science Article 5 abstract Ruddy Turnstones (Arenaria interpres) may be highly aggressive toward other species of shorebirds, including the Short-billed Dowitcher (Limnodromus griseus) (Burger et al.1979), but agonistic behavior of turnstones toward dowitchers at specific foraging sites isnot well documented. Turnstones are opportunistic foragers and may use many feeding methods. DOUGLAS […]

Redshank (Tringa totanus) Science Article 1 abstract As shown for various species, nesting waders are non-randomly distributed on wetlands and preferentially select riparian nest-sites adjacent to limnic or marine waterbodies. Studying the redshank Tringa totanus, we tested the hypotheses that, in a coastal wader species which conceals its clutch in vegetation, predation and hatching success […]

Red Knot (Calidris canutus) Science Article 15 abstract When prey occur at high densities, energy assimilation rates are generally constrained by rates of digestion rather than by rates of collection (i.e. search and handle). As predators usually select patches containing high prey densities, rates of digestion will play an important role in the foraging ecology […]

Red Knot (Calidris canutus) Science Article 12 abstract Bird migration systems must have changed dramatically during the glacial-interglacial cycles of the Pleistocene and as novel habitats became available since the last glacial maximum. This study combines molecular dating of population divergence times with a review of polar-centred palaeovegetation and intertidal habitats world-wide to present a […]

Red Knot (Calidris canutus) Science Article 13 abstract Reversible phenotypic changes, such as those observed in nutritional organs of long-distance migrants, increasingly receive the attention of ornithologists. In this paper we review the cost-benefit studies that have been performed on the flexible gizzard of Red Knots Calidris canutus. By varying the hardness of the diet […]

Red Knot (Calidris canutus) Science Article 14 abstract Rate-maximizing foragers that only divide their time between searching and handling prey should, according to the classical contingency model (CM), only select those prey whose energy content per unit handling time (i.e. profitability) exceeds or equals long-term average energy intake rate. However, if digestively constrained foragers were […]

Red Knot (Calidris canutus) Science Article 10 abstract We compared the differences between spring and autumn in migration speed, fuelling rates and fuel loads of migrating Red Knots Calidris canutus. As a basis we used ringing data from Ottenby Bird Observatory, southeastern Sweden, collected 1948-2003, with morphometrical data from 1990-2003. Numbers ringed varied between 0 […]

Red Knot (Calidris canutus) Science Article 11 abstract This paper reviews the nutrient storage dynamics and body changes of Red Knots Calidris canutus islandica during migration through their final spring stopover area in Iceland and after arrival on the breeding grounds in the northeastern Canadian High Arctic at Alert. In Iceland, Knots not only accumulate […]

Red Knot (Calidris canutus) Science Article 5 abstract We measured the costs of mounting a humoral immune response using two novel antigens (tetanus and diphtheria) in two shorebird species (Scolopacid ): Red Knot (Calidris canutus, measured in autumn) and Ruff (Philomachus pugnax, measured in spring). Metabolic rate was measured during the preinjection phase, at the […]