Influence of seasonal variation in temperature, salinity and food availability on module size and colony growth of the estuarine bryozoan Conopeum seurati
Influence of seasonal variation in temperature, salinity and food availability on module size and colony growth of the estuarine bryozoan Conopeum seurati
复制标题
温度、盐度和食物供应的季节变化对河口苔藓虫Conopeum seurati模块大小和群体生长的影响
DOI：
10.1007/s002270050659
复制
发表时间：
1999
期刊：
影响因子：
2.4
通讯作者：
B. Okamura
中科院分区：
文献类型：
--
作者：
A. O’Dea;B. Okamura
摘要在英国埃文郡的埃文茅斯码头，对河口苔藓动物Conopeum seurati(CANU)(目：口苔藓亚目：软骨甲亚目)的带状动物大小和群体生长进行了15个月的观察。结合温度、盐度和食物可获得性的同步测量对数据进行了分析。类动物的长度、宽度和面积强烈地依赖于温度，而食物可获得性和群体生长速度对类动物的长度、宽度和面积没有显著影响。盐度以及温度和盐度的相互作用显著影响了小兽的长度和面积，这表明小兽大小的变化可能是由于温暖水域的氧气限制造成的。讨论了其他一些机制的有效性，这些机制被用来解释与温度有关的动物园大小的变化。只要数据集很大，并考虑到其他因素对动物大小的影响，结果就支持使用动物大小作为近期和化石组合中温度的长期趋势和季节变化的指标。群体生长率受到群体可获得的食物数量以及温度和食物可获得性的综合影响，这表明生长速度随着食物的增加而增加，但当代谢率较低时，前者在低温下可能受到限制。
Abstract Zooid size and colony growth of the estuarine bryozoan Conopeum seurati (Canu) (order: Cheilostomatida; suborder: Malacostegina) were examined over 15 mo at Avonmouth Dock, Avon, England. Data were analysed in conjunction with synchronous measurements of temperature, salinity and food availability. Zooid length, width and area were strongly temperature-dependent, while both food availability and colony growth rate had no significant effect on zooid length, width or area. Salinity and the interaction of temperature and salinity significantly influenced zooid length and area, suggesting that changes in zooid size may result from oxygen limitation in warm waters. The validity of a number of other mechanisms proposed to account for temperature-related changes in zooid size is discussed. The results support the use of zooid size as an indicator of both long-term trends and seasonal variations in temperature in Recent and fossil assemblages as long as data sets are large and the effects of other factors on zooid size are considered. Colony growth rate was found to be significantly influenced by both the amount of food available to the colonies and the combined effect of temperature and food availability, suggesting that growth rate increases as food increases, but that the former may be limited at low temperatures when metabolic rates are low.