Yellow-legged Gull (Larus cachinnans) Science Article 1 abstract Several species of large white-headed gulls, genus Larus, often hybridize freely where they occur sympatrically (Ingolfsson 1987, Pierotti 1987, Spear 1987, Pierotti & Annett 1993). In the Ebro Delta (Ebro Delta National Park, 40
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Predation by a Marsh Harrier Circusaeruginosus on Yellow-legged GullLarus michahellis nests
Yellow-legged Gull (Larus cachinnans) Science Article 3 abstract This note reports a case of predation by an adult female Marsh Harrier Circus aeruginosus onthree nests of Yellow-legged Gulls Larus michahellis at the Ebro Delta. The predation wasobserved on 4 April 2002 on one of the dykes that separate the saltpan-heaters of La Trinitat(Punta de la […]
Deconstructing myths on large gulls and their impact onthreatened sympatric waterbirds
Yellow-legged Gull (Larus cachinnans) Science Article 2 abstract Owing to increasing population trends and facultative predatory habits, large gullshave been identified as significant agents of change in the alteration of manyecological communities. Often, they are perceived as negatively impacting thepopulation trends of most sympatric waterbirds. Consequently, culling programshave been implemented to remove adults, chicks and […]
PURSUIT AND CAPTURE OF A RING-BILLED GULL BY BALD EAGLES
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 […]
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 […]
Impact of the Ring-Billed Gull (Larus delawarensis) on the Microbiological Quality of Recreational Water
Ring-billed Gull (Larus delawarensis) Science Article 1 abstract We evaluated the impact of the ring-billed gull (Larus delawarensis) on the microbiological quality of water. We measured fecal coliforms, Salmonella spp., and aeromonas spp. in the gull droppings and the number of fecal coliforms in the water prior to and after attracting these birds to the […]