Tag: all of Calidris

Cost-benefit analysis of mollusc eating in a shorebird I. Foraging and processing costs estimated by the doubly labelled water method

Red Knot (Calidris canutus) Science Article 4 abstract Although the energy costs of foraging and food processing in vertebrates may be considerable, they have rarely been quantified separately. Here we present estimates for both cost factors based on a series of trials with a shorebird, the red knot Calidris canutus, fed natural and artificial prey […]

Endogenous circannual rhythmicity in a non-passerine migrant, the Knot Calidris canutus.

Red Knot (Calidris canutus) Science Article 8 abstract We present experimental evidence for endogenous control of circannual rhythms in a long-distance migratory wader, the Knot Calidris canutus. Six individuals of the subspecies canutus were caught during northward migration whilst staging in France, and were held together under constant temperature and photoperiodic conditions (15 degree C, […]

Where waders may parallel penguins: Spontaneous increase in locomotor activity triggered by fat depletion in a voluntarily fasting Knot.

Red Knot (Calidris canutus) Science Article 6 abstract A Knot Calidris canutus, kept with four conspecifics on an enclosed artificial outdoor tidal flat in The Netherlands, refused to feed on the available bivalve prey for a period of 18 days and thereby decreased in mass from 209 g to 107 g, at which point the […]

Length of stopover, fuel storage and a sex-bias in the occurrence of two subspecies of Red Knots Calidris c. canutus an d C.c. islandica in the Dutch Wadden Sea during southward migration.

Red Knot (Calidris canutus) Science Article 1 abstract During southward migration the Wadden Sea is the meeting place of Red Knots Calidris canutus of two subspecies that breed in either western Siberia (C. c. canutus) or north Greenland and north-east Can ada (C. c . islandica), but the details of their co-occurrence have not been […]

Population structure and origins of Purple Sandpipers Calidris maritima in north Norway during winter

Purple Sandpiper (Calidris maritima) Science Article 2 abstract Wintering Purple Sandpipers Calidris maritima were captured at Varangerfjorden, Finnmark, in March 1992, and compared with samples from Troms county in November 1988 to describe the population structure in north Norway in terms of age and sex classes, and to determine the origins of these wintering birds. […]

How do Purple Sandpipers Calidris maritima survive the winter north of the Arctic circle?

Purple Sandpiper (Calidris maritima) Science Article 1 abstract Winter north of the Arctic circle in northern Norway is colder, windier and there is less solar radiation than in eastern Scotland, at a latitude 13degree further south. We predicted from equations derived from heated taxidermic mounts that the maintenance metabolism (Basal Metabolic Rate plus extra costs […]

Effectiveness of predator exclosures for pectoral sandpiper nests in Alaska

Pectoral Sandpiper (Calidris melanotos) Science Article 1 abstract During the summer of 1992 we placed wire-mesh exclosures around 13 of 52 Pectoral Sandpiper (Calidris melanotos) nests near Oliktok Point on the North Slope of Alaska. Exclosures were 66-69 cm in diameter, 31-cm tall, and were made of 5 X 10-cm mesh weld-wire with 3-cm mesh […]

Effectiveness of predator exclosures for pectoral sandpiper nests in Alaska

Pectoral Sandpiper (Calidris melanotos) Science Article 1 abstract During the summer of 1992 we placed wire-mesh exclosures around 13 of 52 Pectoral Sandpiper (Calidris melanotos) nests near Oliktok Point on the North Slope of Alaska. Exclosures were 66-69 cm in diameter, 31-cm tall, and were made of 5 X 10-cm mesh weld-wire with 3-cm mesh […]

The energetic costs of egg heating constrainincubation attendance but do not determinedaily energy expenditure in thepectoral sandpiper

Pectoral Sandpiper (Calidris melanotos) Science Article 2 abstract Heating eggs during incubation may be relatively energetically costly, affecting the outcome or number of breeding attempts. We Will Cresswell, S. Holt,a J. M. Reid, D. P. Whitfield, R. J. Mellanby, D. Norton and S. Waldron, Behavioral Ecology Vol. 15 No. 3: 498-507 Download article download full […]

The energetic costs of egg heating constrainincubation attendance but do not determinedaily energy expenditure in thepectoral sandpiper

Pectoral Sandpiper (Calidris melanotos) Science Article 2 abstract Heating eggs during incubation may be relatively energetically costly, affecting the outcome or number of breeding attempts. We Will Cresswell, S. Holt,a J. M. Reid, D. P. Whitfield, R. J. Mellanby, D. Norton and S. Waldron, Behavioral Ecology Vol. 15 No. 3: 498-507 Download article download full […]