東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Effects of insecticides on freshwate...

Hunt, Elizabeth Shirin.

Linked to FindBook

Google Book

Amazon

博客來

Effects of insecticides on freshwater invertebrate communities of small streams in soy-production regions of South America.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of insecticides on freshwater invertebrate communities of small streams in soy-production regions of South America./
Author:	Hunt, Elizabeth Shirin.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	134 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.
Contained By:	Dissertation Abstracts International78-03B(E).
Subject:	Environmental science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10150883
ISBN:	9781369056488

Effects of insecticides on freshwater invertebrate communities of small streams in soy-production regions of South America.
Hunt, Elizabeth Shirin.

Effects of insecticides on freshwater invertebrate communities of small streams in soy-production regions of South America. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 134 p.

Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.

Thesis (Ph.D.)--University of California, Berkeley, 2016.

In this dissertation, I examined the occurrence of insecticides in streams in intensive soy production regions of South America, and their effects on invertebrate communities. Recently soy has become a major export crop in South America, and the insecticides used are highly toxic to aquatic invertebrates. I adapted the Species at Risk pesticide index (SPEARpesticides), which was developed in Europe to assess effects of pesticide contamination in agricultural streams. I then explored the relative importance of insecticides in comparison to other agricultural stressors, and the potential for riparian buffers to mitigate pesticide transport and impacts. My study sites were on small streams adjacent to agricultural fields in four soy production regions: two regions in the Argentine Pampas (La Plata-Magdalena and Arrecifes), and one region each in the Atlantic forest habitat of Brazil and Paraguay.

ISBN: 9781369056488Subjects--Topical Terms:

677245
Environmental science.

Effects of insecticides on freshwater invertebrate communities of small streams in soy-production regions of South America.
LDR:03578nmm a2200361 4500 001 2120953
005 20170724102931.5
008 180830s2016 ||||||||||||||||| ||eng d
020 $a 9781369056488
035 $a (MiAaPQ)AAI10150883
035 $a AAI10150883
040 $a MiAaPQ $c MiAaPQ
100 1 $a Hunt, Elizabeth Shirin. $3 3282928
245 1 0 $a Effects of insecticides on freshwater invertebrate communities of small streams in soy-production regions of South America.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 134 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.
500 $a Adviser: Vincent H. Resh.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2016.
520 $a In this dissertation, I examined the occurrence of insecticides in streams in intensive soy production regions of South America, and their effects on invertebrate communities. Recently soy has become a major export crop in South America, and the insecticides used are highly toxic to aquatic invertebrates. I adapted the Species at Risk pesticide index (SPEARpesticides), which was developed in Europe to assess effects of pesticide contamination in agricultural streams. I then explored the relative importance of insecticides in comparison to other agricultural stressors, and the potential for riparian buffers to mitigate pesticide transport and impacts. My study sites were on small streams adjacent to agricultural fields in four soy production regions: two regions in the Argentine Pampas (La Plata-Magdalena and Arrecifes), and one region each in the Atlantic forest habitat of Brazil and Paraguay.
520 $a Commonly used insecticides were detected at high frequencies in all three countries, and pyrethroids insecticides were the most likely to occur at acutely toxic concentrations. Samples with highest toxicity were collected from streams with riparian buffer width less than 20 m, and buffer width was the most important predictor variable in explaining insecticide levels. I evaluated the toxicity of the four most commonly detected insecticides to Hyalella curvispina, a freshwater amphipod that is widespread in South America. The lowest LC50 values were found for the pyrethroid insecticides lambda-cyhalothrin and cypermethrin, followed by chlorpyrifos and alpha-endosulfan.
520 $a After adapting the SPEARpesticides index for local invertebrate communities in the Argentina streams, I found that SPEARpesticides was the only response metric that was significantly correlated with insecticide levels. Multiple regression showed that insecticide toxicity was the most important stressorin explaining variability in the SPEARpesticide index.
520 $a I then evaluated the relative importance of insecticides and other agricultural stressors on invertebrate communities in Atlantic Forest streams. Although buffer widths in Brazil streams were negatively correlated with insecticide concentrations, and had a moderate importance in mitigating effects on some sensitive taxa, insecticides had little importance in explaining variability in invertebrate communities. The forested riparian buffer zones are likely to have mitigated the effects of pesticides on stream invertebrate communities in these regions.
590 $a School code: 0028.
650 4 $a Environmental science. $3 677245
650 4 $a Ecology. $3 516476
650 4 $a Toxicology. $3 556884
650 4 $a Agriculture. $3 518588
650 4 $a Aquatic sciences. $3 3174300
690 $a 0768
690 $a 0329
690 $a 0383
690 $a 0473
690 $a 0792
710 2 $a University of California, Berkeley. $b Environmental Science, Policy, & Management. $3 1678657
773 0 $t Dissertation Abstracts International $g 78-03B(E).
790 $a 0028
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10150883