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Phenology and taxonomic composition ...

Bouchard, Raymond William, Jr.

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Phenology and taxonomic composition of lotic Chironomidae (Diptera) communities in contrasting thermal regimes.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Phenology and taxonomic composition of lotic Chironomidae (Diptera) communities in contrasting thermal regimes./
Author:	Bouchard, Raymond William, Jr.
Description:	435 p.
Notes:	Adviser: L. C. Ferrington, Jr.
Contained By:	Dissertation Abstracts International68-11B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3289167
ISBN:	9780549327967

Phenology and taxonomic composition of lotic Chironomidae (Diptera) communities in contrasting thermal regimes.
Bouchard, Raymond William, Jr.

Phenology and taxonomic composition of lotic Chironomidae (Diptera) communities in contrasting thermal regimes. - 435 p.

Adviser: L. C. Ferrington, Jr.

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

Temperature is generally assumed to be the most important factor influencing aquatic insects. However, for most aquatic insect species sufficient information is not available to predict how temperature affects their life history and distribution. To improve the understanding of this relationship, the influence of temperature on the phenology, composition, and community dynamics of chironomid communities in Minnesota streams was performed followed by a detailed study on a common winter-emerging species, Diamesa mendotae Muttkowski. The phenology and composition of chironomid communities was measured using biweekly collections of surface floating pupal exuviae from six thermally stable and six thermally variable streams in east-central Minnesota. The results of this assessment indicate that chironomid taxa richness is significantly influenced by thermal variability with thermally variable streams in this region supporting many more taxa. This pattern was driven by the high summer temperatures in thermally variable streams which support a diverse fauna of warm-adapted taxa (i.e., Chironominae and Tanypodinae) that were largely excluded from more thermally stable streams. Differences in thermal preferences among congeneric taxa did not appear to increase temporal partitioning of the habitat to permit a greater number of species to coexist. These patterns indicated that temporal shifts in the community were therefore largely manifest at the subfamily or tribe level. Autecology research on D. mendotae indicated that this species is well adapted to winter activity, with a supercooling point in the adults of -21.5°C and freeze tolerance in the larvae. Life history studies indicate that the growth of this species is largely limited to habitats with temperatures below 10°C. In thermally buffered streams, this species was bivoltine or multivoltine with the bulk of larval development occurring during winter. Both community-level and species-level research provides a better understanding of how temperature regulates chironomid species and communities in small streams of the upper Midwest. This knowledge is important if these aquatic communities are to be used more effectively in biological monitoring and will improve predictions of the impacts of climate change on aquatic species and communities.

ISBN: 9780549327967Subjects--Topical Terms:

1017726
Biology, Ecology.

Phenology and taxonomic composition of lotic Chironomidae (Diptera) communities in contrasting thermal regimes.
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035 $a (UMI)AAI3289167
035 $a AAI3289167
040 $a UMI $c UMI
100 1 $a Bouchard, Raymond William, Jr. $3 1285276
245 1 0 $a Phenology and taxonomic composition of lotic Chironomidae (Diptera) communities in contrasting thermal regimes.
300 $a 435 p.
500 $a Adviser: L. C. Ferrington, Jr.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7084.
502 $a Thesis (Ph.D.)--University of Minnesota, 2007.
520 $a Temperature is generally assumed to be the most important factor influencing aquatic insects. However, for most aquatic insect species sufficient information is not available to predict how temperature affects their life history and distribution. To improve the understanding of this relationship, the influence of temperature on the phenology, composition, and community dynamics of chironomid communities in Minnesota streams was performed followed by a detailed study on a common winter-emerging species, Diamesa mendotae Muttkowski. The phenology and composition of chironomid communities was measured using biweekly collections of surface floating pupal exuviae from six thermally stable and six thermally variable streams in east-central Minnesota. The results of this assessment indicate that chironomid taxa richness is significantly influenced by thermal variability with thermally variable streams in this region supporting many more taxa. This pattern was driven by the high summer temperatures in thermally variable streams which support a diverse fauna of warm-adapted taxa (i.e., Chironominae and Tanypodinae) that were largely excluded from more thermally stable streams. Differences in thermal preferences among congeneric taxa did not appear to increase temporal partitioning of the habitat to permit a greater number of species to coexist. These patterns indicated that temporal shifts in the community were therefore largely manifest at the subfamily or tribe level. Autecology research on D. mendotae indicated that this species is well adapted to winter activity, with a supercooling point in the adults of -21.5°C and freeze tolerance in the larvae. Life history studies indicate that the growth of this species is largely limited to habitats with temperatures below 10°C. In thermally buffered streams, this species was bivoltine or multivoltine with the bulk of larval development occurring during winter. Both community-level and species-level research provides a better understanding of how temperature regulates chironomid species and communities in small streams of the upper Midwest. This knowledge is important if these aquatic communities are to be used more effectively in biological monitoring and will improve predictions of the impacts of climate change on aquatic species and communities.
590 $a School code: 0130.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Entomology. $3 1018619
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773 0 $t Dissertation Abstracts International $g 68-11B.
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790 1 0 $a Ferrington, L. C., Jr., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3289167