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Ecol Evol. 2018 Mar 2;8(7):3609-3616. doi: 10.1002/ece3.3835. eCollection 2018 Apr.

Testing ontogenetic patterns of sexual size dimorphism against expectations of the expensive tissue hypothesis, an intraspecific example using oyster toadfish (Opsanus tau).

Author information

1
North Carolina Museum of Natural Sciences Raleigh NC USA.
2
Senckenberg Institute for Biodiversity and Climate Frankfurt am Main Germany.
3
Physics and Biology Unit Okinawa Institute of Science and Technology Graduate University Okinawa Japan.
4
Department of Applied Ecology North Carolina State University Raleigh NC USA.
5
Delaware Division of Fish and Wildlife Dover DE USA.

Abstract

Trade-offs associated with sexual size dimorphism (SSD) are well documented across the Tree of Life. However, studies of SSD often do not consider potential investment trade-offs between metabolically expensive structures under sexual selection and other morphological modules. Based on the expectations of the expensive tissue hypothesis, investment in one metabolically expensive structure should come at the direct cost of investment in another. Here, we examine allometric trends in the ontogeny of oyster toadfish (Opsanus tau) to test whether investment in structures known to have been influenced by strong sexual selection conform to these expectations. Despite recovering clear changes in the ontogeny of a sexually selected trait between males and females, we find no evidence for predicted ontogenetic trade-offs with metabolically expensive organs. Our results are part of a growing body of work demonstrating that increased investment in one structure does not necessarily drive a wholesale loss of mass in one or more organs.

KEYWORDS:

evolutionary ecology; fishes; life history trade‐offs; phenotypic evolution; reproductive physiology; swim bladder

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