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Impacts of road crossings and flow o...

Slutzker, Juliet M.

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Impacts of road crossings and flow on crayfish population structures.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Impacts of road crossings and flow on crayfish population structures./
作者:	Slutzker, Juliet M.
面頁冊數:	46 p.
附註:	Source: Masters Abstracts International, Volume: 54-06.
Contained By:	Masters Abstracts International54-06(E).
標題:	Aquatic sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1592227
ISBN:	9781321862577

Impacts of road crossings and flow on crayfish population structures.
Slutzker, Juliet M.

Impacts of road crossings and flow on crayfish population structures. - 46 p.

Source: Masters Abstracts International, Volume: 54-06.

Thesis (M.S.)--Bowling Green State University, 2015.

Habitat fragmentation has rapidly intensified with the increasing prevalence of roads. Within aquatic ecosystems, one potential mechanism for fragmentation is the installation of crossing structures at road-stream intersections. These structures have the potential to impact ecosystem function by increasing flow velocity and altering habitat downstream of the crossing. Crayfish are organisms that rely on flow and substrate as guidelines in habitat selection, and thus act as model organisms that can be directly affected by the installation of road crossings. To investigate potential differences in substrate and crayfish population demographics upstream and downstream of bridges and culverts, road-stream crossing surveys were conducted in Northern Michigan. Proportions of 8 substrate types were visually estimated upstream and downstream at each site. Flow velocities (m/s) were measured in upstream natural riffles and compared to velocities measured within crossing structures to determine the impact of road crossings on flow velocity. To determine effects of road crossings on population structures, the sex, size, and abundance of crayfish at these sites were analyzed. Results indicate that culverts significantly increase stream flow while bridges do not. Furthermore, our results demonstrate that road crossings are associated with altered sex ratios and differential sizes of upstream and downstream crayfish. These findings coupled with correlations between flow and crayfish size and abundance demonstrate that road crossings that increase flow velocities are impacting crayfish populations. These results show that increased flow velocities in road crossings have the potential to fragment stream habitats and inhibit gene flow between populations of stream fauna.

ISBN: 9781321862577Subjects--Topical Terms:

3174300
Aquatic sciences.

Impacts of road crossings and flow on crayfish population structures.
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