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Book Effects of Time of Breeding and Manipulation of Hatch Date on the Reproductive Success and Behavior of the Herring Gull

Download or read book Effects of Time of Breeding and Manipulation of Hatch Date on the Reproductive Success and Behavior of the Herring Gull written by Sarah Crew Brunson and published by . This book was released on 1997 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Aspects of the Nesting Ecology and the Effect of Vegetation Manipulations on Herring Gulls Larus Argentatus and Great Black backed Gulls L Marinus in Jamaica Bay New York

Download or read book Aspects of the Nesting Ecology and the Effect of Vegetation Manipulations on Herring Gulls Larus Argentatus and Great Black backed Gulls L Marinus in Jamaica Bay New York written by Julia Lisa Tims and published by . This book was released on 1999 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Some Effects of Asynchronous and Synchronous Hatching and Parental Investment on Reproductive Success of the Herring Gull on Kent Island New Brunswick

Download or read book Some Effects of Asynchronous and Synchronous Hatching and Parental Investment on Reproductive Success of the Herring Gull on Kent Island New Brunswick written by Percy Norman Hébert and published by . This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Some Effects of Asynchronous and Synchronous Hatching and Parental Investment on Reproductive Success of the Herring Gull on Kent Island New Brunswick

Download or read book Some Effects of Asynchronous and Synchronous Hatching and Parental Investment on Reproductive Success of the Herring Gull on Kent Island New Brunswick written by Percy Norman Hébert and published by . This book was released on 1985 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Effects of Nest Site Environment and Timing of Breeding on Reproductive Success in Franklin s Gulls Larus Pipixcan

Download or read book Effects of Nest Site Environment and Timing of Breeding on Reproductive Success in Franklin s Gulls Larus Pipixcan written by Emily Anne Berg and published by . This book was released on 2009 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Breeding Ecology and Competition Between Great Black backed and Herring Gulls

Download or read book Breeding Ecology and Competition Between Great Black backed and Herring Gulls written by Patricia Anne McGill and published by . This book was released on 1977 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Distinguishing Between Specialism and Opportunism in the Diet of Herring Gulls

Download or read book Distinguishing Between Specialism and Opportunism in the Diet of Herring Gulls written by Laura Post and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For large gulls, predation of other waterbirds is generally considered a specialist strategy and may have potential benefits for reproductive success. During three years of study, however, nearly all herring gulls (Larus argentatus) breeding around the edges of a large ring-billed gull (L. delawarensis) colony on Gull Island, Ontario, were found to eat the chicks of this smaller species to some extent. I collected diet, behavioral, and productivity data to differentiate the extent to which predatory behavior was a specialist strategy or merely opportunistic, test the hypothesis that feeding on waterbirds is evolutionarily beneficial, and evaluate current management strategies in light of the results. Herring gulls predated ring-billed gull chicks most frequently when these chicks were most readily available: immediately after hatching and then again, around fledging when they formed crches on the beach. Herring gulls holding territories close to ring-billed gull crches exploited ring-billed gull prey to a greater extent. Behavioral watches and over 1,900 hours of remote video footage (both day and night) showed that all attacks were initiated within the herring gulls own breeding territories and predatory attacks did not include any specialized behavioral adaptations. Lastly, ring-billed gull chicks appeared to be a relatively poor food item for herring gull chicks and there was no consistent relationship between herring gull productivity and the proportion of ring-billed gull chicks in the diet. I conclude that at this site waterbird predation by herring gulls is predominantly opportunistic and does not appear to show any immediate benefit in terms of evolutionary fitness. This indicates that current management strategies based on controlling specialist predatory gulls are likely to be ineffectual in mixed-species colonies such as this and could be replaced by effective, non-lethal management, such as physical barriers.

Book Factors Affecting Breeding Success of the Herring Gull Larus Argentatus Pont at an Increasing and a Decreasing Colony

Download or read book Factors Affecting Breeding Success of the Herring Gull Larus Argentatus Pont at an Increasing and a Decreasing Colony written by Roy Armstrong and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Contaminants in Herring Gull Eggs from the Great Lakes

Download or read book Contaminants in Herring Gull Eggs from the Great Lakes written by C. A. Bishop and published by . This book was released on 1997 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 12-page fact sheet which describes changes in the concentration of four selected organochlorine compounds found in herring gull eggs between 1971 and 1995. It also describes some of the biological effects associated with these chemicals which have been observed in both gerring gulls and other fish-eating waterbirds living on the Great Lakes. This fact sheet also explains the reasons for this ongoing monitoring program and how the results reflect the ongoing efforts being made to restore the Great Lakes ecosystem to a healthy state.

Book Selected Aspects of the Breeding Biology of Two Lake Erie Herring Gull Colonies

Download or read book Selected Aspects of the Breeding Biology of Two Lake Erie Herring Gull Colonies written by Gerrard Thomas Haymes and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Aspects of the breeding biology of two Lake Erie Herri ng Gull colonies were studied in 1975 and 1976. In 1976 the incubation attention given 2-egg and 3-egg clutches initiated early and late in the season was measured. Brood size at one colony was artificially increased or decreased by addition of chicks shortly after hatching. Hatching success was not consistently re~ated to clutch size but early nesters were more successful than late nes'ters. Differences in hatching success between 2-egg and 3-egg clutches were a function of the time of clutch initiation with the clutch size having the greater proportion of its nests initiated early in the season being more successful. The incubation attentiveness of parents of 2-egg and 3-ev,g , and early and late clutches was similar. Most nests were incubated greater than 95% of the time although t heir hatching success was similar ' to those incubated less than 75% of the time. Fledging success, chick growth and weight at fledging were similar among broods of one, two and three chicks and artificially increased broods of four and five chicks. Fledging success was highest for o.e chick broods reduced from two and three chick broods.

Book Pattern Mechanism and Adaptive Significance of Territoriality in Herring Gulls Larus Argentatus

Download or read book Pattern Mechanism and Adaptive Significance of Territoriality in Herring Gulls Larus Argentatus written by Joanna Burger and published by American Ornithologists Union. This book was released on 1984 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: