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Study on the Recovery of the Intertidal communities on Seawall from the Environmental Disturbances caused by Unusual Hot weather

异常炎热天气环境扰动下海堤潮间带群落的恢复研究

基本信息

批准号：
16580276
负责人：
KADO Ryusuke
金额：
$ 1.73万
依托单位：
Kitasato University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

We have studied to aim recovery of the Intertidal communities on seawall from the environmental disturbances caused by unusual hot weather in 1998, especially focusing on intertidal barnacle, Semibalanus carious and its ecological role. Field studies have been conducted at Sakihama seawall in Okkirai Bay, Iwate Prefecture. during 2004-2006. PVC test plates have been set on the wall with different distances from wall to prevent predators such as sea-urchin and snails. We also investigated the effect of surface roughness for recruitment of sessile organisms by using concrete panels with different convexo-concavities. Effect of pedation by S. intermedius was investigated for barnacles and mussels in laboratory conditions.As a result of field experiments, first we found that recovery of the intertidal communities will be possible if predators such as sea-urchin Strongyrocentrotus intermedius and snails could be controlled. Laboratory experiments proved that S. intermedius preys on barnacles and mussels if the preys are small. Second, intertidal barnacle Semibalanus cariosus which is a dominant species in northern Pacific coast is essential to build up intertidal communities on the seawalls as a subsuate for secondary sessile organisms such as mussel Mytilus galloprovincialis brown alga Undaria pinnatifida, and red alga Analypus japonicus. Third, convexo-concavities are effective to facilitate recruitment of sessile organisms, but concavities tends to be filled by small sedentary animals such as bryozoans and serpulids. It seems important to set or put concavities on seawalls at an appropriate season to form long-lasting intertidal communities.For future study, it is important to invent a way to eliminate sea-urchin S. intermedius with easy to manage to form and preserve intertidal communities. This concept will be applicable for subtidal communities and may give a hint to recover from rocky-shore denudation.

本文以1998年异常高温天气对海堤潮间带生物群落的影响为研究对象，重点研究了潮间带藤壶（Semibalanus carious）及其生态学作用。在岩手县Okkirai湾的Sakihama海堤进行了实地研究。在2004-2006年期间。墙壁上设置了PVC测试板，与墙壁的距离不同，以防止海胆和蜗牛等捕食者。我们还调查了表面粗糙度的效果，招聘固着生物通过使用混凝土面板具有不同的convexo-concavities。S.作为野外实验的结果，我们首先发现，如果能控制海胆、中间球海胆和螺类等捕食性动物，潮间带生物群落的恢复是可能的。实验室实验证明S.如果猎物很小的话，intermedius会捕食藤壶和贻贝。其次，潮间带藤壶Semibalanuscariosus是北方太平洋沿岸的优势种，是次级固着生物贻贝Mytilusgalloprovincialisbrown、裙带菜Undariapinnatifida和红贻贝Analypusbrown的替代物，对海堤潮间带生物群落的建立起重要作用。第三，凹凸是有效的，以促进招聘固着生物，但凹往往是填补了小型定居动物，如苔藓虫和serpulids。因此，在适当的季节在海堤上设置或放置凹穴，对形成持久的潮间带群落具有重要意义。易于管理的中间型，形成和保存潮间带群落。这一概念将适用于潮下带群落，并可能给一个提示，从岩石海岸剥蚀恢复。