Abstract:
:Metabolism shapes the ecosystem role of organisms by dictating their energy demand and nutrient recycling potential. Metabolic theory (MTE) predicts consumer metabolic and recycling rates will rise with warming, especially if body size declines, but it ignores potential for adaptation. We measured metabolic and nutrient excretion rates of individuals from populations of a globally invasive fish that colonized sites spanning a wide temperature range (19-37°C) on two continents within the last 100 yr. Fish body size declined across our temperature gradient and MTE predicted large rises in population energy demand and nutrient recycling. However, we found that the allometry and temperature dependency of metabolism varied in a countergradient pattern with local temperature in a way that offset predictions of MTE. Scaling of nutrient excretion was more variable and did not track temperature. Our results suggest that adaptation can reduce the metabolic cost of warming, increasing the prospects for population persistence under extreme warming scenarios.
journal_name
Ecologyjournal_title
Ecologyauthors
Moffett ER,Fryxell DC,Palkovacs EP,Kinnison MT,Simon KSdoi
10.1002/ecy.2463subject
Has Abstractpub_date
2018-10-01 00:00:00pages
2318-2326issue
10eissn
0012-9658issn
1939-9170journal_volume
99pub_type
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