Effects of Insolation on Juvenile Herring Gull Energetics and Behavior

Lustick, Sheldon; Battersby, Brian; Kelty, Michael

doi:10.2307/1936603

Cited by 23 publications

(35 citation statements)

References 14 publications

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“…(2) m ean tem perature in April and M ay, when conditions were generally m ore severe; (3) the total num ber of hours during the breeding season in w hich the windchill (M ather, 1974) exceeded som e threshold (W C); (4) the total num ber of hours in which that threshold was exceeded and opaque cloud cover w as greater than 70% (reduction of solar radiation m ay compound the physiological stress from low tem peratures and high winds (Lustick et al, 1979); (5) cumulative windchill in April.…”

Section: W Eather Data and Analysismentioning

confidence: 99%

Mark-resighting analysis of a California gull population

Pugesek¹,

Nations²,

Diem³

et al. 1995

Journal of Applied Statistics

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SU MMA RY C alifornia gulls (Larus californicus) of known age and sex were censused on their breeding colony in 1979, 1980 and 1984 through 1993. Ages of 235 males and 196 females ranged from 4 to 27 years. Age classes used in the analysis were limited to 17, 4 through 19, and 20 or more as a ® nal age category because data on gulls over 20 were sparse. Survival declined with age in a way that was parsimon iously modelled with a quadratic function. Other factors, sex and time, did not explain any variation in survival. Resighting depended on age, sex and time. Younger adu lts skipped breeding more frequently than did older adults, and females skipped breeding more frequently than did males. There was also good evidence for time dependence in resighting probability, but its inclusion in the model occurred at the expense of interpretability and precision. In a data set such as this, resighting probability may assume more importance than a merè nuisance parameter' . In this study, resighting history measured attendance at the breeding ground . In turn, attendance rates may be a manifestation of reproductive strategy, which can also have consequences for survival. In this situation, there may be heterogeneity in both survival and resighting probability that is unexplained by the model. W hile such complexity may well be a nuisance to deal with, it can also point to important biological questions.

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Section: W Eather Data and Analysismentioning

confidence: 99%

Mark-resighting analysis of a California gull population

Pugesek¹,

Nations²,

Diem³

et al. 1995

Journal of Applied Statistics

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show abstract

“…Absorption of solar energy by dark plumage has been associated with increased heat gain (Lustick et al 1978(Lustick et al , 1979Finch et al 1980) and reduced metabolic rates (Enger 1957;Hamilton and Heppner 1967;Lustick 1969;Heppner 1970;Marder 1973;MacMillen et al 1977;Wunder 1979;Ellis 1980). However, Kovarik (1964) and Walsberg et al (1978) calculated that dark feathers could reduce the amount of energy that penetrates to and is absorbed by the skin.…”

Section: Conclusion Regarding Durabilitymentioning

confidence: 99%

An Analysis of Physical, Physiological, and Optical Aspects of Avian Coloration with Emphasis on Wood-Warblers

Burtt¹

1986

Ornithological Monographs

117

150

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“…gull populations is largely anecdotal (Vermeer 1963, Howell et al 1974, Gillett et al 1975). Furthermore, although reports of individual variation in thermoregulatory traits are common (Bartholomew and Dawson 1979, Lustick et al 1979), the consequences of this variation for survivorship or reproductive success have not been explored. Thus it is difficult to evaluate the significance of thermal stress as an ongoing source of natural selection on breeding ecology in gull populations.…”

Section: For Many Species Of Open-nesting Seabirds Heat Is a Formidabmentioning

confidence: 99%

The Selective Importance of Heat Stress in Gull Nest Location

Salzman¹

1982

Ecology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Ecological Society of America is collaborating with JSTOR to digitize, preserve and extend access to Ecology. Abstract. A brief but intense heat wave on 9 June 1979 caused catastrophic chick mortality in a population of Western Gulls on Santa Barbara Island, California, USA. Mortality ranged from 0 to 90%o in different areas of the colony. Mortality was not a function of the amount of vegetation cover available to chicks, nor did chick age or size affect the probability of mortality during the heat wave. In the absence of a heat wave, chick mortality due to heat stress is rare in this population.Microclimate analysis in 1980 showed that the area of high chick heat stress mortality in 1979 was characterized by higher ground and air temperatures and lower wind velocities than the area of low mortality. Taxidermic thin metal chick models had a higher integrated thermal load, or operative environmental temperature, in the area of previous high mortality.The persistent nesting by gulls in areas of high potential chick mortality cannot be explained by habitat shortage or by the competitive inferiority of those birds. Enhanced access to food resources may explain the persistence of one area, but not of several others. Analysis of long-term weather records for the southern Channel Islands region showed that heat waves during the breeding season are rare: of nine possible heat waves in 62 yr of data, five have occurred since 1973. The present nesting distribution of gulls on the island has probably not evolved in a regime of frequent heat waves, but rather in response to a long period of highly equable climatic conditions.

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Effects of Insolation on Juvenile Herring Gull Energetics and Behavior

Cited by 23 publications

References 14 publications

Mark-resighting analysis of a California gull population

Mark-resighting analysis of a California gull population

An Analysis of Physical, Physiological, and Optical Aspects of Avian Coloration with Emphasis on Wood-Warblers

The Selective Importance of Heat Stress in Gull Nest Location

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