Critical and chronic thermal maxima of northern and florida largemouth bass and their reciprocal F1 and F2 hybrids

Robert Fields, Shirley S. Lowe, Christine Kaminski, Gregory S. Whitt, David P. Philipp

Research output: Contribution to journalArticle

Abstract

Thermal responses varied among four genetic stocks of juvenile largemouth bass: Northern largemouth bass Micropterus salmoides salmoides (NLMB), Florida largemouth bass M. s. floridanus (FLMB), and both reciprocal F1 hybrids, NLMB ♀ × FLMB ♂ (N × F) and FLMB ♀ × NLMB ♂ (F × N). Thermal responses for each stock were measured as the critical thermal maximum, the temperature at which death occurred during a temperature increase of 0.2°C/min, for fish at various acclimation temperatures (8, 16, 24, 32°C); and chronic thermal maximum, the temperature at which death occurred during a temperature increase of l°C/d, for fish acclimated to 32°C. The rank order of values for both response measurements was identical for the four stocks: F × N > FLMB > N × F > NLMB. Increased acclimation temperature resulted in significant, proportional increases in the critical thermal maxima for all stocks. In addition, second-generation hybrid stocks (N × F F2 and F × N F2) that were acclimated at 24°C produced similar critical thermal maximum values (38.4°C and 37.8°C, respectively) that were intermediate between those of the NLMB (37.3°C) and FLMB (39.2°C). Subsequent genetic analysis revealed no correlation between critical thermal maximum and genotype at the three enzyme loci studied (Mdh-B, Idh-B, and Aat-B). Thus, the subspecific origin of the alleles at these three loci had no detectable influence on the thermal responses of hybrid offspring.

Original languageEnglish (US)
Pages (from-to)856-863
Number of pages8
JournalTransactions of the American Fisheries Society
Volume116
Issue number6
DOIs
StatePublished - Nov 1987

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

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