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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Annual and spatial variability in gains of body weight in Macoma balthica (L.): Relationships with food supply and water temperature
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Annual and spatial variability in gains of body weight in Macoma balthica (L.): Relationships with food supply and water temperature

机译：猕猴（Macoma balthica，L。）体重增加的年度和空间变化：与食物供应和水温的关系

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摘要

The present paper reports on the results of a long-term field study on the simultaneous influence of 2 environmental factors (temperature and food supply) on annual growth rates in the tellinid bivalve Macoma balthica. For ＞30 y (1978-2009) we monitored twice-annually the weight changes of soft parts of individuals of known age at several permanent sampling stations located at Balgzand, an extensive (50 km~2) tidal flat area in the western Dutch Wadden Sea. Monthly data were available on mean water temperature and chlorophyll a (chl a) concentration from a nearby site in the main tidal inlet. Mean individual ash-free dry weights at ages of nearly 1 and of nearly 1.5 y were assessed in February/March and in August respectively. Such weights show a consistent annual pattern: they increase between late winter and early summer to decline for the remainder of the year. Annual multi-station means of the spring/summer individual weight gains were higher as chl a concentrations in the water had been higher and water temperatures had been lower for the growing season. These correlations proved to be stronger at sampling sites that were situated low in the intertidal zone close to the main tidal stream than at those high in the intertidal near the coast (where M. balthica obtain their food primarily by deposit feeding on benthic material). At the low off-shore sites, suspended algae are available for longer daily periods and their concentrations in flood water may be less depleted by grazers. The negative correlation between weight gain and water temperature may have been primarily based on the shortening of the M. balthica growing seasons in warm summers. We conclude that the present simultaneous trends of global warming and declining stocks of pelagic algae may affect M. balthica in the Wadden Sea in a similar, negative, way.
机译：本文报道了一项长期的野外研究结果，该研究涉及两个环境因素（温度和食物供应）对碲化双壳类​​Macoma balthica的年增长率的同时影响。在＞ 30 y（1978-2009）期间，我们每年两次在位于荷兰西部瓦登（Badzand）广阔的（50 km〜2）潮汐平坦区Balgzand的几个永久性采样站，监测已知年龄个体的软部分的重量变化海。每月数据可得自主要潮汐进口附近站点的平均水温和叶绿素a（chla）浓度。分别在2月/ 3月和8月评估了年龄分别为1岁和1.5岁的平均无灰干重。这样的权重显示出一致的年度模式：在冬末和初夏之间增加，在剩余的时间内减少。春季/夏季个体增重的年度多站平均值较高，因为生长季节水中的chl a浓度较高，而水温较低。这些相关性在靠近主要潮汐流的潮间带低处的采样点被证明比在海岸附近潮间带高的采样点更强（在这里，M。balthica主要通过底栖材料上的沉积物来获取食物）。在近海低地站点，悬浮藻类每天可提供更长的时间，而它们在洪水中的浓度可能会因放牧者而减少。体重增加与水温之间的负相关关系可能主要是由于温暖的夏季，巴氏芽孢杆菌的生长季节缩短了。我们得出的结论是，目前全球变暖和浮游藻类种群减少的同时趋势可能以类似的负面方式影响瓦登海的巴氏衣藻。

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