Intracolony Variability during Periods of Poor Reproductive Performance at a Glaucous-Winged Gull Colony

Murphy, Edward C.; Hoover-Miller, Anne; Day, Robert H.; Oakley, Karen L.

doi:10.2307/1369245

Cited by 17 publications

(18 citation statements)

References 19 publications

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“…This closely matched the extent of variation reported in the same species over a 50-year period at several breeding colonies in the Salish Sea (Blight 2011), and closely matched the between-year difference in clutch size at a single colony in Alaska (Murphy et al 1984). But contrary to prediction, there was no systematic effect of SST on the mean clutch size.…”

Section: Discussionsupporting

confidence: 85%

“…Dietary differences from one year to the next could also be a factor: in experiments, female gulls fed proteinenhanced diets exhibited greater egg-production capacity than females fed lipid-enhanced diets, and females fed chicken eggs fared better than those fed fish (Bolton et al 1992). A naturally-occurring difference in diet quality between two years likewise affected clutch size in Glaucous-winged Gulls, but Murphy et al (1984) did not report on whether egg size was affected. In any case, none of these explanations easily accounts for the fact that SST influenced egg size in clutches of one and three eggs, but not two eggs.…”

Section: Discussionmentioning

confidence: 97%

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Effects of Sea-surface Temperature on Egg Size and Clutch Size in the Glaucous-winged Gull

Hipfner¹

2012

Waterbirds

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 97%

Effects of Sea-surface Temperature on Egg Size and Clutch Size in the Glaucous-winged Gull

Hipfner¹

2012

Waterbirds

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“…The reproductive performance of glaucous gulls Larus glaucescens was lower when adults ate more mussels and fewer fish (Murphy et al 1984). Goose barnacles or other marine invertebrates would therefore appear not to be preferred food items, presumably because of their low nutritive value (Massias & Becker 1990).…”

Section: Discussionmentioning

confidence: 99%

Inter-colony variation in diet and reproductive performance of great skuas Catharacta skua

Phillips¹,

Catry²,

Thompson³

et al. 1997

Mar. Ecol. Prog. Ser.

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Sustained population growth of great skuas Catharacta skua during the current century has been attributed largely to a high abundance of sandeels, principally Ammodytes marinus, and a plentiful supply of discards from whitefish trawlers in the vicinity of breeding colonies A new colony of great skuas was establ~shed at St Kilda, Outer Hebrides, in 1963 and has since grown rapidly despite an apparent lack of sandeels in the waters surrounding the archipelago and the presence of only a small whitefish fishery. This paper presents an analysis of diet and breeding ecology of great skuas at Hirta, St Kilda, over 3 seasons, 1994 to 1996, with comparative data from Foula, Shetland, the largest and one of the oldest of the British colonies. At St Kilda, breeding adults, nonbreeders and chicks all fed extensively upon other seabirds (44 to 65'\L of pellets over the 3 yr), and to a lesser extent on goose barnacles Lepassp. (18 to 30":, of pellets) and fish (16 to 30'X of pellets), with sandeel virtually absent from the diet (0.2 to 0.3% of pellets). In contrast, at Foula only 4 to 1 2 % of pellets were of other seabirds, with sandeels and d~scarded fish together const~tuting the vast majority ( 4 to 3 6 "~ and 55 to 88% of pellets, respectively). Despite the low availability of sandeels and discards at St k l d a , egg volumes, chick body condition and annual productivity were at least as high as at Foula, and territorial attendance of breeding adults was much higher, indicating considerably lower foraging effort during chick-rearing. Great skuas at St Kilda are therefore able to make effective use of other seabirds as a food resource during the breeding season, in sharp contrast to Foula where adult mortality increased and chick growth rates and breeding success plummeted during the marked decline in sandeel abundance in the late 1980s.

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“…Recent nesting data from the Alaskan Beaufort Sea barrier islands indicated that the mean annual number of glaucous gull nests had not increased from 1970 -74 to 1987 -2001. The low proportion of active nests and small mean clutch sizes on the barrier islands during 1998 -2001 (i.e., compared to the Y-K Delta) were also not typical of a growing gull population (Murphy et al, 1984;Hiom et al, 1991;Pons and Migot, 1995;Pierotti and Bellrose, 1986;Kilpi et al, 1996;Oro et al, 1996). In contrast, nest productivity data for the Y-K Delta indicated that the nesting glaucous gull population there may be increasing (Bowman et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Clutch size may reflect population growth and health in gulls (Pierotti and Bellrose, 1986). Most Larid gulls lay two or three eggs per nest, and resource abundance may be indicated by clutch size, egg size, and in particular the size of the third egg in the clutch (Kadlec and Drury, 1968;Murphy et al, 1984;Pierotti and Bellrose, 1986;Hiom et al, 1991;Pons and Migot, 1995;Kilpi et al, 1996;Oro et al, 1996).…”

Section: Nesting Trendsmentioning

confidence: 99%

Oilfield Development and Glaucous Gull (Larus hyperboreus) Distribution and Abundance in Central Alaskan Beaufort Sea Lagoons, 1970–2001

Noel¹,

Johnson²,

Gazey³

2009

ARCTIC

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ABSTRACT. We evaluated aerial survey data for glaucous gulls (Larus hyperboreus) in central Alaskan Beaufort Sea lagoons near the Prudhoe Bay oilfields during June to September 1978September -2001 for trends in numbers of glaucous gulls, associations with human activity, and confounding relationships with environmental variables. Most glaucous gulls were in barrier island and mainland shoreline habitats, and the total number of gulls per survey ranged from 50 to 1600. Seasonal variation in abundance was apparent, with the largest numbers of gulls consistently recorded during September surveys. Ice cover and wave height had a significant negative correlation with the linear density of glaucous gulls (gulls/km). There was no clear trend in abundance of gulls in the lagoons at Prudhoe Bay or obvious interaction with human activity (such as air traffic, boat traffic, or humans on land or water) in the survey area during the period of oilfield development (1978 -2001). We compiled glaucous gull nest counts from 1970 to 2001 across barrier islands to evaluate trends in the number of nests and associations with other colonial nesting species. The mean number of active glaucous gull nests increased from 1970 -74 (77.6 nests per year) to 1975 -85 (154.4 nests per year), but there was no evidence of a difference from 1970 -74 to 1987 -2001 (153.0 nests per year). However, the change in 1976 from aerial to ground-based nest surveys confounds comparison of the survey periods before this date (1970 -74) with those after it (1975 -85 and 1987 -2001). A strong positive relationship between the number of glaucous gull nests and both common eider and snow goose nests suggests that common environmental variables may be regulating nesting for these species.

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Intracolony Variability during Periods of Poor Reproductive Performance at a Glaucous-Winged Gull Colony

Cited by 17 publications

References 19 publications

Effects of Sea-surface Temperature on Egg Size and Clutch Size in the Glaucous-winged Gull

Effects of Sea-surface Temperature on Egg Size and Clutch Size in the Glaucous-winged Gull

Inter-colony variation in diet and reproductive performance of great skuas Catharacta skua

Oilfield Development and Glaucous Gull (Larus hyperboreus) Distribution and Abundance in Central Alaskan Beaufort Sea Lagoons, 1970–2001

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