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Environmental quality and fish commu...

Wang, Ching-ming James.

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Environmental quality and fish community ecology in an agricultural mountain stream system of Taiwan.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Environmental quality and fish community ecology in an agricultural mountain stream system of Taiwan./
作者:	Wang, Ching-ming James.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1989,
面頁冊數:	142 p.
附註:	Source: Dissertation Abstracts International, Volume: 50-06, Section: B, page: 2258.
Contained By:	Dissertation Abstracts International50-06B.
標題:	Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8920195

Environmental quality and fish community ecology in an agricultural mountain stream system of Taiwan.
Wang, Ching-ming James.

Environmental quality and fish community ecology in an agricultural mountain stream system of Taiwan. - Ann Arbor : ProQuest Dissertations & Theses, 1989 - 142 p.

Source: Dissertation Abstracts International, Volume: 50-06, Section: B, page: 2258.

Thesis (Ph.D.)--Iowa State University, 1989.

A 1.5 year environmental and faunal analysis was conducted in headwater streams of the upper Ta-chia River in mountainous central Taiwan. The area had distinct wet and dry seasons owing to monsoonal-typhoonal rainfall patterns. Compared to natural stream areas, agriculturally impacted reaches had greater discharge fluctuation, warmer temperatures, higher turbidity, increased nutrient loads, and reduced bedform diversity.Subjects--Topical Terms:

516476
Ecology.

Environmental quality and fish community ecology in an agricultural mountain stream system of Taiwan.
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100 1 $a Wang, Ching-ming James. $3 3341697
245 1 0 $a Environmental quality and fish community ecology in an agricultural mountain stream system of Taiwan.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1989
300 $a 142 p.
500 $a Source: Dissertation Abstracts International, Volume: 50-06, Section: B, page: 2258.
500 $a Supervisors: Bruce W. Menzel; Dennis L. Scarnecchia.
502 $a Thesis (Ph.D.)--Iowa State University, 1989.
520 $a A 1.5 year environmental and faunal analysis was conducted in headwater streams of the upper Ta-chia River in mountainous central Taiwan. The area had distinct wet and dry seasons owing to monsoonal-typhoonal rainfall patterns. Compared to natural stream areas, agriculturally impacted reaches had greater discharge fluctuation, warmer temperatures, higher turbidity, increased nutrient loads, and reduced bedform diversity.
520 $a Stream biotic communities varied according to local habitat characteristics. Coldwater algae existed mainly within natural stream reaches while eutrophication indicators occurred abundantly at agriculturally impacted sites. Large-bodies shredder-collector and predatory insects inhabited natural stream areas while smaller scraper-collectors were dominant in an agriculturally modified stream.
520 $a Four fish species occur in the system: the endangered Taiwanese landlocked masu salmon (Oncorhynchus masou formosanus), kooye minnow (Varicorhinus barbatulus), Taiwanese tasseled-mouth loach (Crossostoma lacustre) and stream goby (Rhinogobius brunneus). Originally, this stream system was uniquely hospitable to the salmon owing to suitable cold water, a gentle gradient, moderate climate, and rich invertebrate food resources. In the last half-century, the salmon has become restricted because of overexploitation, population fragmentation by dams, and habitat deterioration caused by landslides and agricultural impacts.
520 $a Multivariate analyses indicated that the minnow is a habitat generalist primarily associated with boulder cover while the loach is a specialist associated with boulder plus fast current. Both minnow and loach fed extensively upon attached algae and algal detritus, and small insect larvae; the latter ate significantly more insects than the former. Cyclical fluctuations of these food resources are chiefly determined by discharge events.
520 $a There is no evidence that the salmon is detrimentally affected by any of its three ichthyofaunal associates because of their spatial and trophic segregation; however, its future could be imperiled by landslides, dams, and any expansion of row-crop agriculture. A comprehensive recovery plan for the salmon is proposed.
590 $a School code: 0097.
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650 4 $a Forestry. $3 895157
650 4 $a Environmental science. $3 677245
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710 2 $a Iowa State University. $3 1017855
773 0 $t Dissertation Abstracts International $g 50-06B.
790 $a 0097
791 $a Ph.D.
792 $a 1989
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8920195