北限付近のトホシテントウにおける季節適応 : II 卵巣の発育と退化に及ぼす日長と温度の影響

概要

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Differing from southern populations in Tokyo, females of the northernmost population of Epilachna admirabilis in Sapporo started ovary development soon after emergence, and entered reproductive diapause under short-day photoperiod<14.5 L in autumn. A part of adults hibernated occasionally, and oviposited again from the next June. Oviposition by post-hibernating females occurred in a range of day lengths ≥14 L and 15-27℃, but their ovarioles developed up to halfway even under a short-day photoperiod, 10 L. Although velocity of the ovary development was slightly affected by day length females exposed, threshold of the development was 7.9℃ and thermal constant was 219℃-days at 16 L condition. Mature ovary of newly emerged females degenerated under day lengths ≤14 L, and repeatedly developed in long-day photoperiod conditions.
日本昆虫学会の論文
2000-06-25