. The Canadian field-naturalist. 1992 Reimchen: Extended Longevity in Large-Bodied Gasterosteus 123. Figure 1. Thin-sections of pelvic spines obtained from two sticklebacks marked as adults in spring 1985 and recaptured in June 1988. Each shows six distinct annuli (arrows) and one possible outer annuli. Assuming adults were marked at minimum age (32 months), individuals should have six annuli and be at least 68 months of age. Sticklebacks do not succumb to mass mortality after their first breeding season. Adult sticklebacks, marked during the breeding season in spring 1985 were recaptured duri
. The Canadian field-naturalist. 1992 Reimchen: Extended Longevity in Large-Bodied Gasterosteus 123. Figure 1. Thin-sections of pelvic spines obtained from two sticklebacks marked as adults in spring 1985 and recaptured in June 1988. Each shows six distinct annuli (arrows) and one possible outer annuli. Assuming adults were marked at minimum age (32 months), individuals should have six annuli and be at least 68 months of age. Sticklebacks do not succumb to mass mortality after their first breeding season. Adult sticklebacks, marked during the breeding season in spring 1985 were recaptured during four successive years (Table 1) indicating a potential life span of 7 y assuming a minimum age of 32 months at the time of marking. High recapture frequencies in spring and summer 1986 demonstrate that the longevity is common. Gradual reduction in recaptures from 1986 to 1990 presumably indicates a loss of the oldest cohorts and continued recruitment of younger fish into the breed- ing population. Cross-sections of pelvic spines taken from recap- tured fish in 1988 show exceptionally clear annuli (Figure 1). Ages of the recaptures are 5 y (N = 5), 6 y (N = 11), 7 y (N = 5) and 8 y (N = 2) demonstrat-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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