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Lars B. Pettersson Christer Bro nmark Energetic consequences of an inducible morphological defence

Summary: Lars B. Pettersson á Christer BroÈ nmark
Energetic consequences of an inducible morphological defence
in crucian carp
Received: 22 March 1999 / Accepted: 14 June 1999
Abstract Crucian carp (Carassius carassius) increases in
body depth in response to chemical cues from piscivores
and the deeper body constitutes a morphological defence
against gape-limited piscivores. In the ®eld, deep-bodied
individuals suer a density-dependent cost when com-
peting with shallow-bodied conspeci®cs. Here, we use
hydrodynamic theory and swimming respirometry to
investigate the proposed mechanism underlying this ef-
fect, high drag caused by the deep-bodied morphology.
Our study con®rms that drag is higher for deep-bodied
crucian carp, both in terms of estimated theoretical drag
and power curve steepness. However, deep-bodied ®sh
swimming at the velocity associated with minimum cost
of transport, Umc, did not experience higher costs of
transport than shallow-bodied ®sh. Deep-bodied crucian
carp had signi®cantly lower standard metabolic rates,


Source: Agrell, Jep - Department of Ecology, Lunds Universitet


Collections: Environmental Sciences and Ecology