SGER: Development of Radioisotope Methods to Detect Costs ofInducible Defenses and Associated Translocation Shifts

固着群体无脊椎动物的生物相互作用通常是 由局部部署在细胞表面的诱导结构介导。 殖民地在任何其他动物群中，都不可能有这样的一种动物。 生态互动功能之间的紧密关系 和潜在的生理限制。殖民地 海洋苔藓虫，膜孔虫，特别改变 形态与生物环境的变化：刺是 由捕食者诱导，匍匐茎由一些同种。先前 工作表明，棘精确的健身成本，这 该项目将测试这一假设，即潜在的机制， 代价是破坏整个菌落的易位和代谢， 模式. 虽然诱导型防御在海洋生物中很常见， 陆地和淡水生物，成本一直是 经常被证明，没有研究阐明机制 辩护的基本成本。 目前的假设是， 项目是基于一个简单的源汇模型的概念 控制苔藓虫群体中易位的基本过程 将生理功能与生态性能相结合。 该项目将尝试开发放射性同位素方法， 14碳和35硫来检验假设。

Biotic interactions of sessile colonial invertebrates are often mediated by inducible structures that are locally deployed on the colony. In no other group of animals is there likely to be such a tight relationship between the function of ecological interaction and underlying physiological constraints. Colonies of the marine bryozoan, Membranipora membranacea, specifically change morphology with changes in the biotic environment: spines are induced by predators, and stolons by some conspecifics. Previous work has shown that the spines exact a fitness cost and this project will test the hypothesis that the mechanism underlying the cost is disruption of colony-wide translocation and metabolic patterns. Although inducible defenses are common in marine, terrestrial, and freshwater organisms, and costs have been frequently demonstrated, no studies have elucidated mechanisms underlying costs of defense. The current hypothesis of this project is based on the concept of a simple source-sink model controlling the basic process of translocation in bryozoan colonies and linking physiological function with ecological performance. This project will attempt to develop radioisotope methods using 14Carbon and 35Sulfur to test the hypothesis.