The Effect of Human Exclusion on the Population Structure of Key-Hole Limpets Fissurella crassa and F. limbata on the Coast of Central Chile     

Doris  Oliva Juan Carlos  Castilla 《Marine Ecology》1986,7(3):201-217

Abstract. We describe the basic ecology of two key-hole limpets, Fissurella crassa and Fissurella limbata , which are heavily harvested by coastal shellfishermen (mariscadores) at the rocky intertidal of central Chile. The ecological role of human predation on these species was assessed. Anthropic exclusion from a stretch of the rocky intertidal at Las Cruces (non-harvested area) for about two and a half years resulted in changes of the densities and size distributions of these fissurelid species as compared to populations in control zones (harvested area). Differential human predation generates, on key-hole limpets, responses of different intensities related to the accessibility of man to the mesohabitats (sheltered platforms, exposed platforms and vertical walls) and fringes of the intertidal (mid-low intertidal and Lessonia nigrescens fringe). Thus, size distributions and mean densities of both fissurelids differ widely between the harvested and non-harvested areas on both platform habitats but not on vertical walls. In the mid-low intertidal fringe, differences are greater than in the less accessible L. nigrescens intertidal fringe. Moreover, we discuss the way in which other species, directly harvested by mariscadores (i. e., the mollusc Concholepas concholepas) can affect the keyhole limpet populations of central Chile rocky shores. Finally, we highlight the ecological role of these limpets on the dynamics of intertidal ecosystems and how they can modify community landscape.  相似文献   

Coastal geomorphic evolution at the Denglou Cape, the Leizhou Peninsula     

Wang Lirong  Zhao Huanting  Song Chaojing  Yuan Jiayi  Yu Hongbing 《海洋学报(英文版)》2002,21(4):597-611

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅＤｅｎｇｌｏｕＣａｐｅ ,ｉｎｔｈｅｓｏｕｔｈｗｅｓｔｏｆｔｈｅＬｅｉｚｈｏｕＰｅｎｉｎｓｕｌａ ,ｉｓａｔｔｈｅｎｏｒｔｈｍａｒｇｉｎｏｆｔｒｏｐｉｃａｌｚｏｎｅ .ＳｅｖｅｒａｌｒｅｓｅａｒｃｈｅｓａｎｄｃａｒｔｏｇｒａｐｈｉｅｓｏｆｔｈｅｒｅｇｉｏｎａｌｇｅｏｍｏｒｐｈｏｌｏｇｙａｎｄＱｕａｔｅｒ ｎａｒｙｇｅｏｌｏｇｙ ,ｗｈｉｃｈｗｅｒｅｃａｒｒｉｅｄｏｕｔｉｎｔｈｅｐａｓｔ,ａｌｌｉｎｃｌｕｄｅｔｈｉｓａｒｅａ (ＭＧＬ ,ＳＣＳＩＯ ,ＣＡＳ ,1 978;ＧＰＣＳＧＲＣＺＴ…  相似文献   

Centurial and decadal oceanographic influences on changes in northern gannet populations and diets in the north-west Atlantic: implications for climate change   总被引：1，自引：1，他引：1  

Montevecchi  W. A.; Myers  R. A. 《ICES Journal of Marine Science》1997,54(4):608-614

  相似文献   

厦门地区软相潮间带多毛类的生态   总被引：1，自引：0，他引：1  

鲁琳 《台湾海峡》1996,15(3):286-292

根据厦门地区１９９０年２月至１９９２年１月调查软相潮间带所获资料，研究了该区多毛类的种类组成，数量与分布，结果表明，该区多毛类种类丰富，共鉴定出１１８种，隶属于３７科８３属。其中，高潮区４０种，中潮区９０种，低潮区８３种。多毛类平均栖息密度８７个／ｍ＾３，平均生物量３．３３ｇ／ｍ＾２。  相似文献   

福建红树林上钻孔动物的生态   总被引：1，自引：0，他引：1  

黄戚民  周时强 《台湾海峡》1996,15(3):305-309

福建红树林上的钻孔动物共发现了５种，其中软体动物的龙骨节铠船蛆Ｂａｎｋｉａ ｃａｒｉｎａｔａ、裂铠船蛆Ｔｅｒｅｄｏ ｍａｎｎｉ和甲壳动物的光背团水虱Ｓｐｈａｅｒｏｍａ ｒｅｔｒｏｌａｅｖｉｓ是破坏红树林的主要的钻孔动物。钻孔动物钻凿红树茎的基部和裸露的根部，垂直分布受潮汐水位制约，在红树林区的纵深分布与水流畅通程度有关。  相似文献   

秦山核电站邻近水域生态特点     

何德华 《海洋学研究》1991,9(2):119-123

本文综述了1989年4月至1990年1月秦山核电站邻近水域生态调查结果,认为,该水域具暖温带强潮河口区生态特征。水体虽含丰富营养盐和充足溶解氧,由于同时存在着各种不利于生物繁殖生长的环境因子,表现为生物资源贫瘠、种类组成简单,测区所代表的强潮河口湾顶区属低生产力水域。  相似文献   

厦门港岩相潮间带多毛类的生态   总被引：2，自引：0，他引：2  

郑凤武  吴启泉 《台湾海峡》1997,16(1):85-89

本文根据１９８７年２、５、８、１１月调查资料，研究了厦门港岩相潮间带多毛类的种类组成、种类与数量的垂直分布、季节变化，并与大亚湾多毛类生态进行比较。结果表明，调查区域有多毛类４７种。平均栖息密度６０个／ｍ＾２，平均生物量１．７８ｇ／ｍ＾２，潮汐作用影响多毛类的种数、密度、生物量的垂直分布。多毛类数量的季节变化不甚明显，但冬季的栖息密度和春季的生物量较高。  相似文献   

Biokarst on Limestone Coasts, Morphogenesis and Sediment Production   总被引：3，自引：0，他引：3  

Jürgen  Schneider Horst  Torunski 《Marine Ecology》1983,4(1):45-63

Abstract. Biokarst-forms on limestone coasts are developed and arranged according to the bionomic zonation. The development of biokarst is the result of bioerosion, a synergistic effect of biological corrosion by endoliths and biological abrasion by grazers.
The cumulative effect of biogenic carbonate destruction leads to coastal destruction with a resulting highly profiled morphology on the limestone surfaces along the coastal profile. Under the influence of environmental factors a zonation of organisms develops which brings in turn a zonation of erosion rates (0.1-1.1 mm a^-1) resulting in biokarst-forms such as rock holes, rock pools and notches.
Products of bioerosion on limestone coasts are dissolved carbonate (by biological corrosion, 10–30% of the decomposed limestone) and particulate carbonate (by biological abrasion, 70–90% of the decomposed limestone) both of which contribute directly or indirectly to nearshore sedimentation. Size and shape of the bioerosional grains are determined by the boring pattern of the endoliths. The fine-grained sediments (maximum within the fraction 20–63 μm) contribute 3–25 % to the nearshore sediments.
Drastic changes in the biological zonation (like the mass invasion of the sea urchin Paracentrotus lividus in the Northern Adriatic since 1972 which eliminated nearly the entire macrophyte zone) due to unknown factors or pollution can have a profound effect on the bioerosion rates, altering them by as much as a factor of ten.  相似文献   

厦门港岩石岸潮间带软体动物的生态   总被引：2，自引：1，他引：2  

李复雪  蔡立哲 《台湾海峡》1994,13(1):43-51

本文根据１９８２年２月至１９８３年２月在厦门港岩石岩潮间带采集的软体动物，论述了其种类组成，数量分布，生活型及影响软件动物分布的主要环境因子，厦门港岩石岸潮间带共发现软动物５４种。其中，多板类６种，腹足类３３种，双壳类１５种，优势种有僧帽牡蛎，黑荞麦蛤，复瓦小蛇螺，粗糙滨螺等。与６０年代初调查结果比较得出，厦门港岩石岸潮间带的软体动物群落是相对稳定的，潮汐是决定河口结果比较得出，厦门港岩石岩潮间带  相似文献   

我国西部特殊景观区化探方法研究进展   总被引：5，自引：2，他引：3  

张必敏 《物探与化探》2008,32(5):473-476

西部特殊景观区的化探方法研究一直是中国化探界的一个研究热点和难点.在岩石出露、水系发育地区可以沿用传统的水系沉积物化探方法,但在覆盖景观区,常规化探方法效果并不理想.目前,谢学锦和王学求所提出的深穿透地球化学方法,经过一系列的实验研究,证明其能在覆盖区达到快速有效地圈定战略靶区的作用,具有广泛的应用前景.要做好西部特殊景观区的化探工作,化探科研人员必需采取新方法、新思路,继续系统地开展化探方法技术研究,通过不懈的努力最终找到一套适合中国西部特殊景观区特别是覆盖区的行之有效的化探方法.  相似文献