Some like it hot: thermal tolerance and oxygen supply capacity in two eurythermal
When stenothermal spring habitats and eurythermal
stream habitats are concurrently accessible in the Devils River, D.
sanguinea is a euryhaline, eurythermal
organism that grows best in areas with low salinity conditions (mesohaline).
A measured upper lethal temperature of 41.3[degrees]C and estimated temperature tolerance polygon of 1270[degrees][C.sup.2] confirm that the green sunfish is among the most eurythermal
native North American fish species.
2001) and fauna (Castro-Aguirre and Torres-Orozco 1993; Felix-Pico and Garcia-Dominguez 1993) therefore occupies this region as either eurythermal
resident species or seasonal transients.
Some of these taxa could be more exactly defined as eurythermal
(and cosmopolitan), i.e.
tolerance of white sharks is probably due, in part, to their ability to thermoregulate (Carey et al., 1982; Goldman, 1997).
However, for eurythermal
species continuously distributed around southern Florida, the roles of historical versus contemporary processes that shape population structure are less clean Of particular interest in these continuously distributed species is how latitudinal ecotones in eastern Florida contribute to the maintenance or dissolution of any Atlantic/Gulf genetic differences.
Regarding mechanisms for temporal stability, Jackson (1994b) suggests that the major climatic changes that drive biotic turnovers might also impose a filter favoring eurythermal
species; these would then persist, because their limits are not exceeded, over subsequent climatic oscillations (see also Stanley 1986).
It is a eurythermal
and euryhaline species, having a high resistance to low oxygen concentrations (Schaeffer-Novelli 1976).
Aerobic scope does not predict the performance of a tropical eurythermal
fish at elevated temperatures.
Wap65 was first identified as an abundant cytosolic protein in eurythermal
fish such as common carp Cyrinus carpio and goldfish Carassius auratus acclimated to 30degC (Kikuchi, 1993; Watabe et al., 1993), and since has been identified in several fish species, including flounder, mud loach, sea bass, sea bream, plunderfish, swordtail fish, channel catfish, black progy, medaka and pufferfish (Cho et al., 2012; Kim et al., 2013; Stred and Messina, 2003; Nakaniwa et al., 2005; Hirayamaet al., 2003; Clark and Burns, 2008; Aliza et al., 2008; Kikuchi et al., 1995).