Search results for "Metabolic rate"
showing 4 items of 84 documents
Spatial variation in the evolutionary potential and constraints of basal metabolic rate and body mass in a wild bird
2023
An organism's energy budget is strongly related to resource consumption, performance, and fitness. Hence, understanding the evolution of key energetic traits, such as basal metabolic rate (BMR), in natural populations is central for understanding life-history evolution and ecological processes. Here we used quantitative genetic analyses to study evolutionary potential of BMR in two insular populations of the house sparrow (Passer domesticus). We obtained measurements of BMR and body mass (Mb) from 911 house sparrows on the islands of Leka and Vega along the coast of Norway. These two populations were the source populations for translocations to create an additional third, admixed ‘common ga…
Population divergence in maternal investment and embryo energy use and allocation suggests adaptive responses to cool climates
2023
1. The thermal sensitivity of early life stages can play a fundamental role in constraining species distributions. For egg-laying ectotherms, cool temperatures often extend development time and exacerbate developmental energy cost. Despite these costs, egg laying is still observed at high latitudes and altitudes. How embryos overcome the developmental constraints posed by cool climates is crucial knowledge for explaining the persistence of oviparous species in such environments and for understanding thermal adaptation more broadly. 2. Here, we studied maternal investment and embryo energy use and allocation in wall lizards spanning altitudinal regions, as potential mechanisms that enable su…
First measurements of field metabolic rate in wild juvenile fishes show strong thermal sensitivity but variations between sympatric ecotypes
2021
The relationship between physiology and temperature has a large influence on population-level responses to climate change. In natural settings, direct thermal effects on metabolism may be exaggerated or offset by behavioural responses influencing individual energy balance. Drawing on a newly developed proxy, we provide the first estimates of the thermal performance curve of field metabolism in a wild fish. We investigate the thermal sensitivity of field metabolic rate in two sympatric, genetically distinct ecotypes of Atlantic cod from the Skagerrak coast of southern Norway. The combined ecotype median of field metabolic rate increased with increasing temperature until around 16°C, coincide…
Uztura paradumu, fiziskās aktivitātes un miera vielmaiņas intensitātes izvērtējums jaunu cilvēku grupā
2016
Liekais svars un aptaukošanās pazemina dzīves kvalitāti un ir par iemeslu daudzām saslimšanām: diabētam, koronārajām sirds slimībām, onkoloģiskajām saslimšanām, metabolajam sindromam. Pētījuma mērķis ir izvērtēt uztura, fiziskās aktivitātes (FA) un miera vielmaiņas intensitātes (RMR) korelāciju ar ķermeņa tauku masu jaunu, pieaugušu, klīniski veselu cilvēku grupā. Pētījuma gaitā tika analizēta izmeklējamo personu 3 dienu uztura dienasgrāmata, fiziskā aktivitāte noteikta ar anketēšanas metodi, veikti antropometriskie mērījumi un reģistrēta miera vielmaiņas intensitāte ar netiešās kalorimetrijas metodi. Pētījuma rezultātā tika secināts, ka respondentu uzturā ir samazināts relatīvais ogļhidrāt…