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Record #173130:

Effects of maternal characteristics and climatic variation on birth masses of Alaskan caribou / Layne G. Adams.

Title: Effects of maternal characteristics and climatic variation on birth masses of Alaskan caribou / Layne G. Adams.
Author(s): Adams, Layne G.
Date: 2005.
In: Journal of Mammalogy. (2005.), Vol. 86(3) (2005)
Abstract: Examines factors influencing birth mass of caribou (Rangifer tarandus) in central Alaska to study nutritional trade-offs made by females to optimize reproduction, growth, and survival. Evaluates variation in birth mass relative to maternal characteristics (age, body mass, cohort, and nutritional condition as influenced by winter severity) during 11 years with substantial variation in winter snowfall. Snowfall during gestation was predominant factor explaining variation in birth masses, influencing birth mass inversely and through interactions with maternal age and lactation status. Maternal age effects were noted for females older than 5 years, declining in magnitude with each successive age class. Birth mass as proportion of autumn maternal mass was inversely related to winter snowfall, despite no decrease in masses of adult females in late winter associated with severe winters. Conservative maternal investment before parturition may represent an optimal reproductive strategy given that caribou experience stochastic variation in winter severity during gestation, uncertainty of environmental conditions surrounding the birth season, and intense predation on neonates.
Notes:

Journal of Mammalogy. Vol. 86(3) :506-513 (2005).

Keywords: 599.735.3 -- Cervidae: Rangifer tarandus.
551.586 -- Climatology, biological aspects.
59 -- Zoology.
591.13 -- Animal digestion and inanition.
591.131.1 -- Animal feeding behaviour.
591.16 -- Animal reproduction.
591.568 -- Care and feeding of young animals.
H6 -- Zoology: mammals.
(*3) -- Arctic regions.
(*49) -- Alaska.
SPRI record no.: 173130

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245 10 ‡aEffects of maternal characteristics and climatic variation on birth masses of Alaskan caribou /‡cLayne G. Adams.
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500 ## ‡aJournal of Mammalogy. Vol. 86(3) :506-513 (2005).
520 3# ‡aExamines factors influencing birth mass of caribou (Rangifer tarandus) in central Alaska to study nutritional trade-offs made by females to optimize reproduction, growth, and survival. Evaluates variation in birth mass relative to maternal characteristics (age, body mass, cohort, and nutritional condition as influenced by winter severity) during 11 years with substantial variation in winter snowfall. Snowfall during gestation was predominant factor explaining variation in birth masses, influencing birth mass inversely and through interactions with maternal age and lactation status. Maternal age effects were noted for females older than 5 years, declining in magnitude with each successive age class. Birth mass as proportion of autumn maternal mass was inversely related to winter snowfall, despite no decrease in masses of adult females in late winter associated with severe winters. Conservative maternal investment before parturition may represent an optimal reproductive strategy given that caribou experience stochastic variation in winter severity during gestation, uncertainty of environmental conditions surrounding the birth season, and intense predation on neonates.
530 ## ‡aAlso issued online ‡uurn:doi:10.1644/1545-1542(2005)86[506:EOMCAC]2.0.CO;2‡uhttps://dx.doi.org/10.1644/1545-1542(2005)86[506:EOMCAC]2.0.CO;2
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650 07 ‡a551.586 -- Climatology, biological aspects.‡2udc
650 07 ‡a59 -- Zoology.‡2udc
650 07 ‡a591.13 -- Animal digestion and inanition.‡2udc
650 07 ‡a591.131.1 -- Animal feeding behaviour.‡2udc
650 07 ‡a591.16 -- Animal reproduction.‡2udc
650 07 ‡a591.568 -- Care and feeding of young animals.‡2udc
650 07 ‡aH6 -- Zoology: mammals.‡2local
651 #7 ‡a(*3) -- Arctic regions.‡2udc
651 #7 ‡a(*49) -- Alaska.‡2udc
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