DOI: 10.5061/dryad.qg78q
title: Data from: Impacts of deforestation-induced warming on the metabolism, growth, and trophic interactions of an afrotropical stream fish

description: 1. In ectotherms, anthropogenic warming often increases energy
 requirements for metabolism, which can either impair growth (when
 resources are limiting) or lead to higher predator feeding rates and
 possibly stronger top-down trophic interactions. However, the relative
 importance of these effects in nature remains unclear because: 1) thermal
 adaptation or acclimation could lower metabolic costs; 2) greater prey
 production at warmer temperatures could compensate for higher predator
 feeding rates; and/or 3) temperature effects on trophic interactions via
 altered biological rates could be small relative to other,
 temperature-unrelated human impacts on food webs. 2. Here, we examined
 effects of deforestation-associated warming on the minnow Enteromius
 neumayeri, occurring in both forested (cool) and deforested (warm) streams
 located inside or nearby an afrotropical rainforest. Combining approaches
 from physiological and community ecology, we quantified impacts of
 anthropogenic warming on the metabolism, growth, and trophic interactions
 of this tropical ectotherm. We then compared these effects with impacts of
 land use unrelated to temperature. 3. In a long-term laboratory
 acclimation experiment quantifying the temperature-dependence of growth
 and metabolism in E. neumayeri, warming increased metabolic rates and
 decreased growth (at a limited ration). We found no evidence of local
 (thermal) adaptation, with warming affecting farm and forest populations
 similarly. 4. Then, using mark-recapture methods to quantify impacts of
 warming on performance in situ, we found similar growth rates in fish from
 deforested and forested streams despite their distinct thermal
 environments. This suggests higher prey consumption at deforested sites to
 compensate for greater metabolic costs, which could strengthen
 fish-invertebrate interactions. 5. Finally, we developed a bioenergetics
 model to estimate fish-invertebrate interaction strength and quantify
 temperature-related and unrelated impacts of land use on this interaction.
 We found that although warming increased fish consumption, it apparently
 increased invertebrate production even more and thus had a net weakening
 effect on estimated interaction strength. Most importantly, variation in
 both fish and invertebrate density not directly related to temperature had
 a much stronger influence on estimated interaction strength than
 temperature effects on predator consumption and prey growth. 6. We
 conclude that ectotherms can sometimes offset the metabolic costs of
 warming with a small increase in consumption that hardly effects food web
 interactions compared to non-metabolic impacts of anthropogenic
 disturbances. Future research should assess whether this is a common
 feature of heavily-impacted ecosystems facing multiple stressors.
description: Fugere et al 2018 Funct
 Ecol dataFile includes all data
 used in linked publication, namely data on: stream water temperature (diel
 trends and time series), growth and metabolic rates in the lab temperature
 acclimation experiment, body size measurements for the field
 mark-recapture study, and invertebrate abundance and biomass data used in
 the bioenergetics model. The last sheet also includes results of said
 energetics model.