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首页> 外文期刊>Marine ecology >Seasonal Variation in Host Utilization of Epiphytic Lacuna Species in Mixed Algal and Surfgrass Stands in Japan
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Seasonal Variation in Host Utilization of Epiphytic Lacuna Species in Mixed Algal and Surfgrass Stands in Japan

机译：日本藻类和草丛混交林中附生腔c物种寄主利用的季节性变化

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摘要

On the subtidal rocky shore of Akkeshi Bay, Hokkaido, Japan, the congeneric phytal gastropods, Lacuna uchidai and L. decorata, inhabit the multispecific vegetation consisting of the surfgrass, Phyllospadix iwatensis and the brown alga, Cystoseira hakodatensis. We studied the phenologies of Phyllospadix and Cystoseira, host utilization patterns and life histories of Lacuna spp. to examine how these gastropods accommodate the seasonal fluctuations of the habitat. The preferences for macrophyte by Lacuna spp. were examined by laboratory experiments. The phenologies of macrophytes, the seasonal and between-substrata variations of Lacuna spp. were examined by monthly sampling from Phyllospadix and Cystoseira beds between May 1999 and May 2000. Lacuna uchidai showed significant preference for Phyllospadix, whereas L. decorata had no preference for a particular substratum. Most L. uchidai were collected from the Phyllospadix bed, however L. decorata appeared in both Phyllospadix and Cystoseira beds. The peak of new recruit of L. uchidai coincided with that of Phyllospadix biomass. The synchronization of life cycle with the phenology of the host may be adaptive for using the limited habitat. Seasonal variation in density of L. decorata coincided with neither patterns for Phyllospadix nor Cystoseira. Seasonal variation in density and size frequency distribution suggested L. decorata migrated among adjacent macrophytes. Although it was a little vague, this hypothesis was probably the best explanation of our results. Our study shows that two co-occurring Lacuna species utilize the macrophytes as habitats by the different life histories and utilization patterns and, may be alternatively accommodated to the seasonal fluctuations of their habitats.
机译：在日本北海道Akkeshi湾的潮下多岩石海岸上，同类植物腹足纲动物Lacuna uchidai和L. decorata栖息在由草丛，Phyllospadix iwatensis和褐藻Cystoseira hakodatensis组成的多类植被中。我们研究了Phyllospadix和Cystoseira的物候，宿主利用模式和Lacuna spp的生活史。检查这些腹足动物如何适应栖息地的季节性波动。 Lacuna spp对大型植物的偏爱。通过实验室实验进行了检查。大型植物的物候，漆c属的季节性和亚基间变化。在1999年5月至2000年5月之间，通过每月从Phyllospadix和Cystoseira病床进行抽样检查，检查了Lacuna uchidai对Phyllospadix的偏爱，而L. decorata对特定的基质没有偏爱。多数内田乳杆菌都从Phyllospadix床中收集到，但是L. decorata出现在Phyllospadix和Cystoseira床中。内田乳杆菌的新募集高峰与Phyllospadix生物量的高峰一致。生命周期与宿主物候的同步可能适合使用有限的栖息地。紫花苜蓿密度的季节性变化与Phyllospadix和Cystoseira的模式均不相符。密度和大小频率分布的季节性变化表明，装饰花在相邻大型植物之间迁移。尽管有点模糊，但是这个假设可能是我们结果的最佳解释。我们的研究表明，两种同时出现的拉科纳（Lacuna）物种通过不同的生活史和利用方式将大型水生植物用作栖息地，并且可能会适应于其栖息地的季节性波动。

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