Effects of temperature and salinity on the life history of the sailfin molly (Pisces: Poeciliidae): lipid storage and reproductive allocation |
| |
Authors: | M G McManus J Travis |
| |
Institution: | (1) Department of Biological Science, Florida State University, Tallahassee, FL 33206-2043, USA, US |
| |
Abstract: | While the life history traits of animals usually exhibit substantial phenotypic plasticity, such plasticity might reflect
either a simple alteration in the level of energy accrual and use or a genuine shift in energy allocation tactics between
environmental conditions. The latter would represent genuine plasticity in the life history itself, and thus it is important
to distinguish which of these two processes underlies the observed plasticity of life history traits. We investigated this
issue by examining the effects of temperature and salinity variation during ontogeny on the allocation of biomass and lipid
storage in male sailfin mollies, Poecilia latipinna. We raised males from four natural populations from birth to maturity in controlled laboratory conditions. Neither distinct
temperatures (23 or 29°C) nor different salinity regimes (2, 12, or 20 parts per thousand) affected body mass, although males
from different populations differed substantially in body mass. However, males raised at the higher temperature had a greater
allocation of biomass to testis and a lower allocation to viscera mass. The amount of stored lipid was altered by temperature
variation but the direction and magnitude of the effect varied substantially among males from the different populations. Salinity
variation affected neither biomass allocation nor the level of lipid storage. These results indicate that male mollies possess
a flexible developmental program with respect to temperature that canalizes body size and alters the allocation of biomass
among competing demands for reproductive readiness and capacity for energy storage.
Received: 25 November 1996 / Accepted: 1 December 1997 |
| |
Keywords: | Energy allocation Life history traits Phenotypic plasticity Temperature Triacylglycerol |
本文献已被 SpringerLink 等数据库收录! |
|