Yes a lot on Flas but not so much on F-1s.


From http://forums.pondboss.com/ubbthreads.ph...true#Post114857


http://espn.go.com/outdoors/bassmaster/columns/story?page=b_col_bt_bass_biology_0306 Temp and LMB



Transactions of the American Fisheries Society 120:58-64, 1991
© Copyright by the American Fisheries Society 1991
Survival and Growth of Northern, Florida, and Reciprocal
FI Hybrid Largemouth Bass in Central Illinois
DAVID P. PHILIPP AND GREGORY S. WHirr1
Center for Aquatic Ecology, Illinois Natural History Survey
607 East Peabody Drive, Champaign, Illinois 61820, USA
Abstract.—Stocks of northern largemouth bass Micropterus salmoides salmoides, Florida largemouth
bass M. s. Jloridanus, and both reciprocal F, hybrids were produced in Champaign, Illinois,
with natural spawning techniques. The genetic composition of each of these stocks was confirmed
electrophoretically. Overwinter survival of northern largemouth bass in central Illinois was significantly
greater than that of Florida largemouth bass; the two reciprocal F, hybrids had intermediate
survival. The absolute survival rate of all stocks decreased as the severity of the winter
increased; however, the effects were most dramatic for the Florida subspecies. The northern largemouth
bass also exhibited greater second- and third-year growth than the Florida largemouth bass;
again, the reciprocal F, hybrids were intermediate. Results of this study indicate the potential
negative effects that may arise when Florida largemouth bass or hybrids between it and the northern
subspecies are introduced into waters of the USA and Canada that are within or contiguous to the
native range of the northern subspecies.



North American Journal of Fisheries Management 28:516–522, 2008

Copyright by the American Fisheries Society 2008



Here is a basic overview from the study but there is more not said.

Two subspecies of largemouth bass Micropterus

salmoides, the Florida M. s. floridanus and the northern

M. s. salmoides, were first described by Bailey and

Hubbs (1949). Kassler et al. (2002) proposed divergence

of the two warranted species designation. Philipp

et al. (1983) showed that (1) the native range of the

Florida largemouth bass (FLMB) was restricted to

peninsular Florida; (2) the northern largemouth bass

(NLMB) was native to waters north of Maryland along

the Atlantic coast, and then west to the Mississippi

River; and (3) a hybrid zone existed between the ranges

of the two. The FLMB, NLMB, and their hybrids

interbreed where they coexist (Isely et al. 1987;

Gilliland and Whitaker 1991; Philipp and Whitt 1991).

Physiological and ecological differences among

FLMB, NLMB, and their hybrids have been documented.

For example, they exhibited different critical

and chronic thermal maxima (Fields et al. 1987) and

different mortality rates when held at low temperatures

(Carmichael et al. 1988). In addition, FLMB and

NLMB differ in the timing of spawning, growth rate,

reproductive success, and survival (Isely et al. 1987;

Gilliland and Whitaker 1991; Philipp and Whitt 1991).

Performance differs among endemic units within the

historic range of FLMB and NLMB. For example,

growth and survival differed between progeny of

parents from different drainages in Illinois (Philipp

and Claussen 1995). Similarly, swimming performance

differed between Illinois and Wisconsin populations of

bass (Cooke et al. 2001). Lastly, the survival, growth,

and reproductive success of the local stock were higher

than those of the nonlocal stock when comparing

performance among Wisconsin, Illinois, Texas, and

Florida populations at each locale (Philipp et al. 2002).

Last edited by ewest; 03/29/16 10:42 AM.