Spatial patterns of native freshwater mussels in the Upper Mississippi River

Autor: Steven J. Zigler, Nathan R. De Jager, Teresa J. Newton, Patricia R. Ries
Rok vydání: 2016
Předmět:
Zdroj: Freshwater Science. 35:934-947
ISSN: 2161-9565
2161-9549
Popis: Multiple physical and biological factors structure freshwater mussel communities in large rivers, and their distributions have been described as clumped or patchy. However, few surveys of mussel populations have been conducted over areas large enough and at resolutions fine enough to quantify spatial patterns in their distribution. We used global and local indicators of spatial autocorrelation (i.e., Moran’s I) to quantify spatial patterns of adult and juvenile (≤5 y of age) freshwater mussels across multiple scales based on survey data from 4 reaches (navigation pools 3, 5, 6, and 18) of the Upper Mississippi River, USA. Native mussel densities were sampled at a resolution of ∼300 m and across distances ranging from 21 to 37 km, making these some of the most spatially extensive surveys conducted in a large river. Patch density and the degree and scale of patchiness varied by river reach, age group, and the scale of analysis. In all 4 pools, some patches of adults overlapped patches of juveniles, ...
Databáze: OpenAIRE
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