Food supply, grazing activity and growth rate in the limpet Patella vulgata L.:: a comparison between exposed and sheltered shores
Food supply, grazing activity and growth rate in the limpet Patella vulgata L.:: a comparison between exposed and sheltered shores
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DOI：
10.1016/s0022-0981(01)00211-8
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发表时间：
2001-03-30
影响因子：
2
通讯作者：
Hartnoll, RG
中科院分区：
文献类型：
--
作者：
Jenkins, SR;Hartnoll, RG
帽贝Patella vulgata L.是一种重要的食微动物食草动物的潮间带岩石海岸的西北欧，发生在整个波曝光梯度。在不列颠群岛的马恩岛的两个暴露海岸和两个受保护的岩藻占主导地位的海岸的中间标题水平上选择P. vulgata组，并将其操纵到相等的密度和种群结构。放牧活动和增长率的水平，确定了1年的时间。与此同时，以叶绿素α浓度测量的石生微藻丰度被确定为食物供应的估计值。微藻丰度在暴露和遮蔽条件下均表现出季节性模式，冬季水平高于夏季。在两个季节中，所研究的遮蔽海岸的微藻资源都比较丰富。在裸露的海岸，而不是在庇护海岸放牧活动的水平，在草原草原表现出季节性的模式。全年平均来看，裸露海岸的放牧活动是庇护海岸的两倍多。因此，在庇护条件下，食物供应皮毛跛行高，放牧活动低，在暴露的条件下，食物供应低，放牧活动高。以壳长增加来衡量的普通对虾的生长率在暴露和庇护海岸之间没有显着差异，还测定了自然密度下普通对虾的生长率。虽然整体密度下降，减少暴露波作用，单位面积的可放牧物质的密度较高的住房。在这些人群中，平均增长率是两倍以上的高暴露相比，庇护海岸。(C)2001 Elsevier Science B.V.保留所有权利。
The limpet Patella vulgata L. is an important microphagous grazer on intertidal rocky shores of north-west Europe, occurring across the wave exposure gradient. Groups of P. vulgata were selected at mid-title level of two exposed shores and two sheltered, fucoid dominated shores on the Isle of Man, British Isles, and manipulated to equivalent densities and population structure. The level of grazing activity and growth rate were determined over a 1-year period. At the same time, the abundance of epilithic microalgae, measured as the concentration of chlorophyll alpha, was determined as an estimate of food supply. Microagal abundance showed a seasonal pattern in both exposed and sheltered conditions, with higher levels in winter compared to summer. In both seasons, the microalgal resource was more abundant on the sheltered shore studied. The level of grazing activity in P. vulgata showed a seasonal pattern on the exposed but not the sheltered shores. Averaged over the year, grazing activity on the exposed shores was over double that on sheltered shores. Thus, in sheltered conditions, food supply fur limpers was high and grazing activity low; in exposed conditions, food supply was low and grazing activity high. The growth rate of P. vulgata, measured as increase in shell length, showed no significant difference between exposed and sheltered shores, Growth rate was also determined in P. vulgata at natural densities. Although the overall density declined with decreasing exposure to wave action, the density per unit area of grazeable substance was higher in shelter. In these populations, the mean growth rate was over twice as high on exposed compared to sheltered shores. (C) 2001 Elsevier Science B.V. All rights reserved.