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Reproductive maturation in the slug,Limax maximus, and the effects of artificial photoperiod

Summary

Maturation of the reproductive tract ofLimax maximus was studied in a natural population using a reproductive organ-to-body weight index. Male-phase maturation, denoted by enlargement of the hermaphrodite gland (gonad), took place mainly in June and July. Female-phase maturation, signaled by growth of the albumen gland, occurred primarily in September. When slugs were subjected to artificial photoperiods consisting of long (LD 16∶8) or short (LD 8∶16) days, female-phase maturation was not found to be significantly affected by photoperiod (Fig. 4). In contrast, male-phase maturation appeared to be induced by a short-day to long-day transition (Fig. 7). Implications of this finding for normal seasonal maturation are discussed and a maturation sequence involving both photoperiodic and endocrine control mechanisms is suggested.

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This work was supported in part by grants from NSF (BNS 76-10783) and NIH (MH 27948) to P.G.S.

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Sokolove, P.G., McCrone, E.J. Reproductive maturation in the slug,Limax maximus, and the effects of artificial photoperiod. J. Comp. Physiol. 125, 317–325 (1978). https://doi.org/10.1007/BF00656866

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