Grazing effects of the periwinkle Echinolittorina peruviana at a central Peruvian high rocky intertidal
Grazing effects of the periwinkle Echinolittorina peruviana at a central Peruvian high rocky intertidal
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DOI：
10.1007/s10152-007-0086-3
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发表时间：
2008-03-01
影响因子：
--
通讯作者：
Iribarne, Oscar O.
中科院分区：
文献类型：
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作者：
Hidalgo, Fernando J.;Firstater, Fausto N.;Iribarne, Oscar O.
秘鲁棘足动物是秘鲁高潮间带最常见的腹足类动物，占该地区80%以上的个体。在厄尔尼诺-南方涛动（ENSO）的“正常”条件下，采用实验去除蜗牛来评估它们对(a)附体生物膜丰度、(b)藤壶招募和(c)大型藻类丰度的影响。实验于2005年10月至2007年4月在秘鲁中部一个半保护的岩石海岸的两个潮间带水位进行。结果表明，紫杉树在两个高度都能控制生物膜丰度和藤壶的补充，在较低的区域效果明显。直立大型藻（Ulva spp.和Gelidium spp.）受放牧影响较小；但对大藻结壳有负面影响。季节和生理压力似乎对潮间带大型藻类的丰度起着更重要的作用。我们的结果与其他地方报道的高海岸滨水生物相似，并代表了基线数据，以了解潮间带消费者在这些海岸的ENSO冷（拉尼娜）和暖（厄尔尼诺）阶段下的作用如何变化。
Echinolittorina peruviana is the most common gastropod in the high intertidal zone of Peru, representing more than 80% of the individuals present at that zone. Experimental removal of snails was used to evaluate their effects on (a) abundance of epilithic biofilm, (b) barnacle recruitment, and (c) abundance of macroalgae under "normal" conditions of the El Nino Southern Oscillation (ENSO). Experiments were carried out from October 2005 to April 2007 at two intertidal levels of a semi-protected rocky shore of central Peru. Results demonstrated that E. peruviana is able to control biofilm abundance and barnacle recruitment at both heights investigated, with marked effects in the lower zone. Erect macroalgae (Ulva spp. and Gelidium spp.) were less affected by grazing; but negative effects were observed on macroalgal crusts. Season and physical stress seem to play a more important role in the abundance of macroalgae in the high intertidal. Our results are similar to those reported elsewhere for high shore littorinids and represent baseline data to understand how the role of intertidal consumers will vary under the cold (La Nina) and warm (El Nino) phases of ENSO on these shores.