Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 41 for “"Gulls"”.
-
Effects of Herring Gulls and Great Black-backed Gulls on Breeding Piping Plovers, South Monomoy Island, Massachusetts
The large population of breeding Herring Gulls and Great Black-backed Gulls on South Monomoy Island, Cape Cod, Massachusetts has been thought to negatively affect the breeding success of the threatened Piping Plover. Following the Piping Plover Recovery Plan s call for gull colonies to be removed …
-
Eggs, incubation and hatching asynchrony in gulls
… early incubation affects hatching patterns in gulls using measurements of mean nest attendance and daily change of nest attendance. Hatching patterns were influenced by incubation behaviour during egg-laying and early incubation behaviour. As parents spent more time in their nests, a brood …
-
Foraging habits, population changes, and gull-human interactions in an urban population of Herring Gulls (Larus argentatus) and Lesser Black-backed Gulls (Larus fuscus)
… areas. The main urban colonists are Herring gulls (HG; Larus argentatus) and Lesser Black-backed gulls (LB; Larus fuscus). In some urban areas, they are considered a nuisance, although overall gull numbers are declining, and all breeding gulls in Britain are protected by law. Objectives: To …
-
Phylogeography And Habitat Associations Of Franklin's Gulls In Their United States Breeding Range
… structure and habitat use of Franklin's gulls. I found Franklin's gulls in the breeding range of the United States are a panmictic population. It was found habitat use of Franklin's gull colonies at breeding sites depends on multiple variables suggesting landscape management to include …
-
Seasonal Dynamics of Avian Influenza Viruses in Ring-billed Gulls (Larus delawarensis) in Minnesota
… within the orders Charadriiformes (shorebirds; gulls) and Anseriformes (waterfowl) are reservoir hosts for low pathogenicity avian influenza viruses (LPAIVs), but their role in the transmission dynamics of highly pathogenic avian influenza viruses (HPAIVs) is unclear. The novel reassortant HPAIV …
-
Factors Affecting Behavioral Variation of Individual Glaucous-Winged Gulls (Larus Glaucescens) While on Territory
… of behavior of individual Glaucous-winged Gulls <em>(Larus glaucescens)</em> on Protection Island, Jefferson County, Washington were examined. Males were found to be present on territory often than females. Proportions of behavior varied by time of season. Gulls tended to be more alert …
-
Habitat, Diurnal, and Tidal Effects on the Behavior of glaucous- Winged Gulls (LARUS GLAUCESCENS)
… day and tide on the behavior of Glaucous-winged gulls nesting on Protection Island, Jefferson County, Washington. During the period of March - June, 1991, more gulls were present in the colony and their rates of behavior were greater during the morning and evening hours than during midday.</p> …
-
Broad reduction and adoption in ring-billed gulls (Larus Delaworensis): the potential for inergenerational conflict
Patterns of intra-clutch egg size variation and intra-clutch hatch intervals in the Ring-billed gull (Larus delawarensis) were documented during the peak nesting period of two consecutive breeding seasons, at a colony near Port Colborne, Ontario. Egg size decreased with laying order; third laid …
-
Prevalence and Genetic Characterization of Avian Influenza Virus in Ring-billed and Franklin's Gulls in Minnesota
… (AIV) are wild waterbirds such as ducks and gulls. In Minnesota, gulls are abundant and known to visit poultry farms, yet are underrepresented in AIV wild bird surveillance efforts. The purpose of this research was to fill part of this surveillance gap by studying AIV in Ring-billed …
-
An empirical and theoretical investigation of kleptoparasitic foraging behaviour in mixed-species aggregations of gulls (Laridae)
… in mixed-species foraging aggregations of gulls (Laridae). Kleptoparasitism, or food stealing, is a strategy used frequently by gulls. Gull populations are increasing in urban areas despite declining overall. Understanding the role of kleptoparasitism in aiding gulls to invade urban …
-
Helminth communities of ring billed gulls (Larus delawarensis) collected along the St. Lawrence River and Estuary
… of helminths were found in 145 ring billed gulls collected in southern Quebec. No significant differences were observed in the helminth communities of gulls collected in May from four nesting sites (Montreal, Sorel, Quebec City, Les Pilliers), suggesting that infective pools are widespread …
-
The Effects of Diet and Predation on Nesting Herring Gulls (Larus argentatus) in Pukaskwa National Park
Herring gulls (Larus argentatus) are used as ecological indicators of the coastal Lake Superior ecosystem in Pukaskwa National Park. Their populations have declined by 70% over the last 40 years, suggesting changes in the park ecosystem. I assessed herring gull diets and investigated how diet may …
-
Distribution, diet and kleptoparasitic behaviour of gulls (Aves: Laridae) in the southwestern Cape Province, South Africa
… proportion of marine prey in the diet of Kelp Gulls at a refuse dump, a sandy beach and at archaeological sites was estimated using stable carbon isotope analysis of bone collagen. Both gulls are generalist foragers feeding on a wide and diverse range of prey species. The Kelp Gull is able to …
-
The influence of investigator disturbance on aggressive behaviour and breeding success of ring-billed gulls (Larus delawarensis) /
… success of individual pairs of ring-billed gulls nesting at two colonies near Port Colborne, Ontario. The insular colony was on an artificial breakwall, associated with the Welland Ship Canal, approximately 1 km off the north shore of Lake Erie. The mainland colony was adjacent to the canal …
-
The influence of a changing environment on the breeding biology and diet of Kelp Gulls (Larus dominicanus vetula) in Plettenberg Bay, South Africa
… (17%) have increasing populations, including 17 gulls (Larinae). The Kelp Gull Larus dominicanus is a cosmopolitan species with an increasing population worldwide. Kelp Gulls in southern Africa L. d. vetula are one of 15 seabird species that breed in the region, and one of only five breeding …
-
The foraging ecology and conservation of the Great Black-backed Gull Larus marinus
… over 36 years. I demonstrate Great Black-backed Gulls have experienced severe declines at a global scale, meeting the requirements for a “Vulnerable” listing on the IUCN Red List. I then use long-term seabird demographic data from the Isle of May, Scotland, to quantify the impacts of Great …
-
Don't call it a seagull!
… behaviors, and lifestyles (and some of those gulls aren't affiliated with the sea at all). The pattern of similarities and differences between species poses an interesting taxonomic challenge: Can we interpret that pattern to reconstruct evolutionary history and determine where each species …
-
STOMACH CONTENT ANALYSIS OF BOTULISM-AFFECTED BIRDS IN LAKE MICHIGAN
… to 120.60 ± 11.83 mm in ring-billed gulls. There were significant intraspecies differences in the stomach content of ring-billed gulls that were compared across collection period (June – July versus August – October) and of BoNT/E-free double-crested cormorants that were compared …
Page 1 of 3