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Effects of management intensificatio...

Uno, Shinsuke.

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Effects of management intensification on coccids and parasitic hymenopterans in coffee agroecosystems in Mexico.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Effects of management intensification on coccids and parasitic hymenopterans in coffee agroecosystems in Mexico./
作者:	Uno, Shinsuke.
面頁冊數:	246 p.
附註:	Adviser: Ivette Perfecto.
Contained By:	Dissertation Abstracts International68-02B.
標題:	Agriculture, Plant Culture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253423

Effects of management intensification on coccids and parasitic hymenopterans in coffee agroecosystems in Mexico.
Uno, Shinsuke.

Effects of management intensification on coccids and parasitic hymenopterans in coffee agroecosystems in Mexico. - 246 p.

Adviser: Ivette Perfecto.

Thesis (Ph.D.)--University of Michigan, 2007.

Biodiversity maintained in agroecosystems contribute both to conservation and economic goals via various ecosystem services. However, management intensification can negatively affect biodiversity in agroecosystems. Effects of management intensification on biodiversity and its function in agroecosystems need to be explored to develop agricultural practices where conservation and economic goals are successfully integrated. I conducted studies in 4 coffee agroecosystems under low to high management intensities in Chiapas, Mexico to investigate (1) the diversity and abundance of hymenopteran parasitoids, and (2) the function of a natural enemy complex in controlling a potential pest species, the coffee green scale, Coccus viridis.Subjects--Topical Terms:

1018669
Agriculture, Plant Culture.

Effects of management intensification on coccids and parasitic hymenopterans in coffee agroecosystems in Mexico.
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245 1 0 $a Effects of management intensification on coccids and parasitic hymenopterans in coffee agroecosystems in Mexico.
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500 $a Adviser: Ivette Perfecto.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 0730.
502 $a Thesis (Ph.D.)--University of Michigan, 2007.
520 $a Biodiversity maintained in agroecosystems contribute both to conservation and economic goals via various ecosystem services. However, management intensification can negatively affect biodiversity in agroecosystems. Effects of management intensification on biodiversity and its function in agroecosystems need to be explored to develop agricultural practices where conservation and economic goals are successfully integrated. I conducted studies in 4 coffee agroecosystems under low to high management intensities in Chiapas, Mexico to investigate (1) the diversity and abundance of hymenopteran parasitoids, and (2) the function of a natural enemy complex in controlling a potential pest species, the coffee green scale, Coccus viridis.
520 $a Parasitoid collections produced a total of 17,366 individuals and 308 morphospecies representing 29 families. Total estimated species richness exceeded 200 in all sites, however, negative effects of management intensification was indicated by >10% reduction in species richness. The abundance of parasitoids also declined along the intensification gradient. Similarities in species compositions were affected more by the proximity of sites than similarities in management intensity. In addition, the shade layer had greater species richness regardless of management intensity and species compositions of the canopy and coffee layers showed >50% overlap.
520 $a Surveys showed low abundance of C. viridis regardless of management intensity; however, C. viridis infestation caused 40% reduction in coffee fruits weight. Experiments showed that 90% of C. viridis mortality was caused by the coccinelid beetle, Azya orbigera; however, in a more intensively managed site where insect natural enemies were less abundant, 61% of C. viridis mortality was caused by the entomophagous fungus, Verticillium lecanii , and 39% by predation. Surveys showed that parasitism of C. viridis could be >10%; however, experimental results indicated that the presence of coccinelids reduces it to <1%.
520 $a These results suggest the importance of the shade component and spatial arrangement of farms for the conservation of parasitoids in coffee agroecosystems. In addition, relative importance of natural enemies of C. viridis appeared to change under different conditions. Thus maintaining a diverse set of natural enemies can be important in achieving an effective pest control in coffee agroecosystems.
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