Show simple item record

dc.creatorHerbert, Matthew Earlen_US
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to, referencing the URI of the item.en_US
dc.descriptionIncludes bibliographical references (leaves 53-59).en_US
dc.descriptionIssued also on microfiche from Lange Micrographics.en_US
dc.description.abstractBecause most major river drainages are altered by impoundments, it is necessary to understand how such alterations influence structure and function of fish assemblages. Upstream influences of impoundments have only recently been discussed as potentially altering non-anadromous fish Assemblages. Fishes were collected seasonally for one year in tributaries of the impounded West Fork (12 sites) and unimpounded East Fork (9 sites) of the San Jacinto River, Texas. I evaluated spatial and temporal variation in (1) fish assemblage structure, including species richness, biomass, and trophic groups, (2) environmental factors correlated with fish assemblage structure, and (3) differences in Assemblage structure and correlated environmental factors between the East and West Fork tributaries. Factors related to hydrologic variability, especially minimum discharge, separated East and West Fork sites. Although species richness and biomass were similar in the two forks, macrohabitat generalists here more specious in the West Fork, and fluvial specialists, which require flowing conditions for all life stages, were more specious in the East Fork. Differences in trophic structure between East and West Fork Assemblages included more surface and water-column investitures in West Fork streams, whereas benthic investitures, piscivores, omnivores and herbivores were more abundant in East Fork streams. Differences between East and West Forks were concordant with predicted elects of impoundment and are analogous to faunal changes that have occurred across fragmented terrestrial systems. Because impoundment now is ubiquitous in river systems, these embeds likely go unrecognized and may mask or exacerbate effects of other more recent environmental effects.en_US
dc.publisherTexas A&M Universityen_US
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en_US
dc.subjectwildlife and fisheries sciences.en_US
dc.subjectMajor wildlife and fisheries sciences.en_US
dc.titleFish assemblage structure along environmental gradients in a coastal plain drainage: influences from a reservoiren_US
dc.typeThesisen_US and fisheries sciencesen_US
dc.format.digitalOriginreformatted digitalen_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.

Request Open Access