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norskBlar i forfatter "Albon, Steve"
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Context-dependent fitness costs of reproduction despite stable body mass costs in an Arctic herbivore
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-20)1.The cost of reproduction on demographic rates is often assumed to operate through changing body condition. Several studies have found that reproduction depresses body mass more if the current conditions are severe, such as high population densities or adverse weather, than under benign environmental conditions. However, few studies have investigated the association between the fitness components ... -
Determinants of heart rate in Svalbard reindeer reveal mechanisms of seasonal energy management
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-28)Seasonal energetic challenges may constrain an animal's ability to respond to changing individual and environmental conditions. Here, we investigated variation in heart rate, a well-established proxy for metabolic rate, in Svalbard reindeer (Rangifer tarandus platyrhynchus), a species with strong seasonal changes in foraging and metabolic activity. In 19 adult females, we recorded heart rate, ... -
Fat storage influences fasting endurance more than body size in an ungulate
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-26)<ol> <li>The fasting endurance hypothesis (FEH) predicts strong selection for large body size in mammals living in environments where food supply is interrupted over prolonged periods of time. The Arctic is a highly seasonal and food restricted environment, but contrary to predictions from the FEH, empirical evidence shows that Arctic mammals are often smaller than their temperate conspecifics. ... -
Gut microbiome biogeography in reindeer supersedes millennia of ecological and evolutionary separation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-29)Ruminants are dependent on their gut microbiomes for nutrient extraction from plant diets. However, knowledge about the composition, diversity, function, and spatial structure of gut microbiomes, especially in wild ruminants, is limited, largely because analysis has been restricted to faeces or the rumen. In two geographically separated reindeer subspecies, 16S rRNA gene amplicon sequencing revealed ... -
Stress responses to repeated captures in a wild ungulate
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-29)While capture-mark-recapture studies provide essential individual-level data in ecology, repeated captures and handling may impact animal welfare and cause scientific bias. Evaluating the consequences of invasive methodologies should be an integral part of any study involving capture of live animals. We investigated short- and long-term stress responses to repeated captures within a winter on the ...
