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2017 ; 7
(1
): 5177
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Costly neighbours: Heterospecific competitive interactions increase metabolic
rates in dominant species
#MMPMID28701786
Jan?a M
; Gvo?dík L
Sci Rep
2017[Jul]; 7
(1
): 5177
PMID28701786
show ga
The energy costs of self-maintenance (standard metabolic rate, SMR) vary
substantially among individuals within a population. Despite the importance of
SMR for understanding life history strategies, ecological sources of SMR
variation remain only partially understood. Stress-mediated increases in SMR are
common in subordinate individuals within a population, while the direction and
magnitude of the SMR shift induced by interspecific competitive interactions is
largely unknown. Using laboratory experiments, we examined the influence of con-
and heterospecific pairing on SMR, spontaneous activity, and somatic growth rates
in the sympatrically living juvenile newts Ichthyosaura alpestris and Lissotriton
vulgaris. The experimental pairing had little influence on SMR and growth rates
in the smaller species, L. vulgaris. Individuals exposed to con- and
heterospecific interactions were more active than individually reared newts. In
the larger species, I. alpestris, heterospecific interactions induced SMR to
increase beyond values of individually reared counterparts. Individuals from
heterospecific pairs and larger conspecifics grew faster than did newts in other
groups. The plastic shift in SMR was independent of the variation in growth rate
and activity level. These results reveal a new source of individual SMR variation
and potential costs of co-occurrence in ecologically similar taxa.