Data comparing the physiological response to hyperosmotic stress in individual copepods (Tigriopus californicus) from natural populations and laboratory hybrids are presented. While individuals from two genetically differentiated natural populations and F₁ interpopulation hybrids showed only minor differences in patterns of free amino acid (FAA) accumulation during hyperosmotic stress, patterns of FAA synthesis were highly variable among the F₂ hybrids. Isofemale lines initiated from later hybrid generations (F₇-F₁₀) exhibited substantial inter-line variance in FAA accumulation. This increased variance in physiological response appears unrelated to allozyme polymorphisms at two loci encoding FAA-metabolizing enzymes and appears to result from other, unidentified polymorphisms in the proline synthetic pathway.

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Volume44, Issue7

November 1990

Pages 1806-1813

HYBRID BREAKDOWN IN PHYSIOLOGICAL RESPONSE: A MECHANISTIC APPROACH

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HYBRID BREAKDOWN IN PHYSIOLOGICAL RESPONSE: A MECHANISTIC APPROACH

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