DOI
https://doi.org/10.25772/SMDW-GZ51
Defense Date
2010
Document Type
Thesis
Degree Name
Master of Science
Department
Biology
First Advisor
Greg Garman
Abstract
There are few published studies of larval fish assemblages from unregulated, tidal freshwater rivers. Patterns in the spatial and temporal distribution of larval fishes in the Mattaponi River were examined. Sampling took place on a weekly basis from February through August, 2006 and 2007. Larval fishes were categorized by taxa, reproductive guild, and residency guild. Group comparisons using multi-response permutation procedures (MRPP) indicated significant spatial and temporal differences in assemblage composition on multiple scales. Differences in assemblage composition were analyzed using non-metric multidimensional scaling (NMS). Interannual differences were attributable to anadromous and semi-migratory species. Seasonal differences were attributable to herrings, perches, and minnows. Both interannual and seasonal differences in assemblage composition may have been a result of changes in discharge. Spatial (i.e. longitudinal) variation of the larval fish assemblage differed by tidal regime. NMS and MRPP identified a distinct tidal freshwater larval fish assemblage. Tidal freshwater habitats may act as ecotones between marine and riverine ecosystems.
Rights
© The Author
Is Part Of
VCU University Archives
Is Part Of
VCU Theses and Dissertations
Date of Submission
May 2010