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Large wood aids Chinook salmon (Onco...

University of California, Davis.

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Large wood aids Chinook salmon (Oncorhynchus tshawytscha ) spawning in marginal habitat on a regulated river in California.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Large wood aids Chinook salmon (Oncorhynchus tshawytscha ) spawning in marginal habitat on a regulated river in California./
作者:	Senter, Anne Elizabeth.
面頁冊數:	82 p.
附註:	Adviser: Gregory B. Pasternack.
Contained By:	Masters Abstracts International47-05.
標題:	Agriculture, Fisheries and Aquaculture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=1463451
ISBN:	9781109082791

Large wood aids Chinook salmon (Oncorhynchus tshawytscha ) spawning in marginal habitat on a regulated river in California.
Senter, Anne Elizabeth.

Large wood aids Chinook salmon (Oncorhynchus tshawytscha ) spawning in marginal habitat on a regulated river in California. - 82 p.

Adviser: Gregory B. Pasternack.

Thesis (M.S.)--University of California, Davis, 2008.

Key Words: large wood, gravel rivers, Chinook salmon, ecohydraulics, fluvial geomorphology, river rehabilitation

ISBN: 9781109082791Subjects--Topical Terms:

1020913
Agriculture, Fisheries and Aquaculture.

Large wood aids Chinook salmon (Oncorhynchus tshawytscha ) spawning in marginal habitat on a regulated river in California.
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245 1 0 $a Large wood aids Chinook salmon (Oncorhynchus tshawytscha ) spawning in marginal habitat on a regulated river in California.
300 $a 82 p.
500 $a Adviser: Gregory B. Pasternack.
500 $a Source: Masters Abstracts International, Volume: 47-05, page: .
502 $a Thesis (M.S.)--University of California, Davis, 2008.
520 $a Key Words: large wood, gravel rivers, Chinook salmon, ecohydraulics, fluvial geomorphology, river rehabilitation
520 $a To determine whether large wood (LW, ≥1 m length, ≥10 cm diameter) plays a role in Chinook salmon redd (i.e. egg nests) placements in a regulated, medium-sized, Mediterranean-climate river, characteristics of 542 large wood pieces, locations of 650 redds, and habitat unit delineations (riffle, run, glide, pool) were collected during a spawning season along a 7.7 km reach directly below Camanche Dam on the Mokelumne River (average width 31 m). Large wood was regularly distributed across the study reach with an average of 70 LW pieces km-1. Some LW clustering was evident at islands. Chinook spawners built 75% of observed redds at spawning habitat rehabilitation sites, and 85% of redds were within one average channel width of large wood. At the hydraulic scale of &sim;101 channel widths, redds were within a 10-m radius of large wood 36% of the time. These results suggest that spawners had the opportunity to utilize large wood as cover and refugia. In the lower 4.7 km where marginal habitat was prevalent, redds were within a 5-m radius of large wood 21% of the time and within a 2.5 m radius 10% of the time, indicating use of the hydraulic properties of instream large wood structures. Results from randomized tests indicate that large wood-redd interactions systematically occurred at a greater rate than by random chance alone in the lower 4.7 km, but not in the upper 3 km, which implies that large wood aids spawning in marginal habitats.
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