社区生态流鱼:概念、方法和技术

纵向结构在温带流鱼社区:评估概念模型与时态数据

詹姆斯·h·罗伯茨和纳撒尼尔·p·希特

doi:https://doi.org/10.47886/9781934874141.ch13

文摘鱼。五概念模型的纵向考察流上的社区组织:(1)利基多样性模型(NDM),(2)流连续介质模型(SCM),(3)移民可访问性模型(我),(4)环境稳定模型(ESM),和(5)不定流模型(ASM)。我们使用差异模型在预测时间物种周转率,连同五时空鱼社区数据集,对模型的适用性进行评估。模型相似预测积极物种richness-stream nestedness大小关系和纵向物种,但在预测不同类似颞物种周转率整个流连续介质(NDM, (SCM),更高的营业额上游(我,ESM),或更高的营业额下游(ASM)。我们计算空间和时间变化的措施从时空的鱼在五wadeable数据流在长达34 - 68年的北美中部和东部(法国溪[纽约],Piasa溪(伊利诺斯州),云杉(弗吉尼亚州)运行,小石头河(弗吉尼亚州)和沉溪(弗吉尼亚州))。所有流大量物种周转率(即展出。,at least 27% turnover in stream-scale species pools), in contrast to the predictions of the SCM. Furthermore, community change was greater in downstream than upstream reaches in four of five streams. This result is most consistent with the ASM and suggests that downstream communities are strongly influenced by migrants to and from species pools outside the focal stream. In Sinking Creek, which is isolated from external species pools, temporal species turnover (via increased richness) was higher upstream than downstream, which is a pattern most consistent with the IAM or ESM. These results corroborate the hypothesis that temperate stream habitats and fish communities are temporally dynamic and that fish migration and environmental disturbances play fundamental roles in stream fish community organization.