Ring-billed Gull (Larus delawarensis) Science Article 4 abstract Bald Eagles (Haliaeetus leucocephalus) are opportunistic hunters that employ a numberof techniques to capture a wide variety of prey (Bent 1937, Brown and Amadon 1968,Sherrod et al. 1976, McEwan and Hirth 1980). These eagles are known to occasionallypursue prey, including flying birds, in pairs or larger groups […]
Category: Charadriiformes
Breeding success relative to nest location and density in Ring-billed Gull colonies.
Ring-billed Gull (Larus delawarensis) Science Article 6 abstract The role of nest location and density in determining breeding success in Ring-billed Gulls (Lams delawarensis), to our knowledge, has not been studied previously. In breeding colonies some nests will be located centrally while others are peripheral. WILLIAM E. SOUTHERN, THE WILSON BULLETIN Vol. 86, No. 3 […]
Seasonal Enumeration of Fecal Coliform Bacteria from theFeces of Ring-Billed Gulls (Larus delawarensis)and Canada Geese (Branta canadensis)
Ring-billed Gull (Larus delawarensis) Science Article 7 abstract Water suppliers have often implicated roosting birds for fecal contamination of their surface waters. Geeseand gulls have been the primary targets of this blame although literature documenting the fecal coliformcontent of these birds is quite limited. K. A. ALDERISIO AND N. DELUCA, APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 0099-2240/99/$04.0010 […]
OVERHEAD WIRES REDUCE ROOF-NESTING BY RING-BILLED GULLS ANDHERRING GULLS
Ring-billed Gull (Larus delawarensis) Science Article 8 abstract The authors evaluated the effectiveness of overhead wires in reducing roof-nesting by ring-billed gulls(Larus delawarensis) and herring gulls (L. argentatus) at a 7.2 ha food warehouse in Bedford Heights, Ohio during1994-1995. In 1994, stainless steel wires (0.8 mm diameter) were attached generally in spoke-like configurationsbetween 2.4 m […]
Ring-billed gull adoption: what arms race?
Ring-billed Gull (Larus delawarensis) Science Article 5 abstract In his study of adoption of young by ring-billed gulls, Larus delawarensis, Brown (1998) concludes that adoption results from failure of parents to discriminate their own offspring from vagrant chicks. ANTHONY J. F. HOLLEY, ANIMAL BEHAVIOUR, 2000, 60, F15-F16 Download article download full text (pdf)
Astaxanthin is responsible for the pink plumage flushin Franklin’s and Ring-billed gulls
Ring-billed Gull (Larus delawarensis) Science Article 3 abstract Carotenoid pigments produce the red, orange, and yellow plumage of many birds. Carotenoidcontainingfeathers are typically rich in color and displayed by all adult members of the species. In many gulls andterns, however, an unusual light pink coloring (or flush) to the normally white plumage can be found […]
Interactive effects of time and vegetation on reproductionof redshanks ( Tringa totanus) breeding in Wadden Sea salt marshes
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 […]
Digestive bottleneck affects foraging decisions in red knots Calidris canutus. II. Patch choice and length of working day
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 […]
Southward migration and fuel deposition of Red Knots Calidris canutus.
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 […]
Body transformations, condition, and survival in Red Knots Calidris canutus travelling to breed at Alert, Ellesmere Island, Canada.
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 […]