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Invasion ecology of Mytilus gallopro...

Shinen, Jennifer Lynn.

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Invasion ecology of Mytilus galloprovincialis: Competitor and predator effects regulating its establishment and its potential impact as an exotic foundation species.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Invasion ecology of Mytilus galloprovincialis: Competitor and predator effects regulating its establishment and its potential impact as an exotic foundation species./
Author:	Shinen, Jennifer Lynn.
Description:	111 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 5700.
Contained By:	Dissertation Abstracts International68-09B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3283037
ISBN:	9780549254409

Invasion ecology of Mytilus galloprovincialis: Competitor and predator effects regulating its establishment and its potential impact as an exotic foundation species.
Shinen, Jennifer Lynn.

Invasion ecology of Mytilus galloprovincialis: Competitor and predator effects regulating its establishment and its potential impact as an exotic foundation species. - 111 p.

Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 5700.

Thesis (Ph.D.)--University of California, Davis, 2007.

The rocky intertidal communities of central and northern California mark the invasion front the Mediterranean bay mussel, Mytilus galloprovincialis. This work examined whether native predators or native mussel competitors (Mytilus trossulus and Mytilus californianus) generate biotic resistance to the invader. In field and laboratory Mytilus spp. monocultures and polycultures, M. galloprovincialis growth rates always exceeded the two native mussels, indicating that competition does not limit the growth or spread of the invader. Furthermore, M. galloprovincialis consistently led to reduced growth and survival of M. trossulus by restricting movement, smothering and interfering with filter feeding of mussels. Although interference and exploitation competition among Mytilus spp. gave M. galloprovincialis a competitive advantage, M. galloprovincialis was more vulnerable to predators than the native species. In laboratory prey preference feeding trials among common intertidal predators (the seastar, Pisaster ochraceus, the crab, Cancer antennarius, and the dogwhelk Nucella ostrina), predators all tended to consume M. trossulus and M. galloprovincialis over M. californianus, but only N. ostrina showed a clear preference for M. trossulus. After 1 year in the field, predators did not completely eliminate outplants of M. galloprovincialis, suggesting that predation alone might not limit further invasion. The equivalence of biogenic habitat created by native and invasive Mytilus spp. was also examined via the development of epibiont communities associated with artificial mussel beds (shells only) and live mussels. Among artificial mussel beds, M. galloprovincialis and M. trossulus shells supported comparable species richness and diversity, indicating functional redundancy. Among living monocultures and polycultures of M. galloprovincialis and M. californianus, species richness and diversity was lowest on the shells of M. galloprovincialis. Species richness and diversity were always highest among artificial and living M. californianus beds. The displacement of M. trossulus by M. galloprovincialis may have minimal impact on associated community structure. However, continued spread of the invader at the expense of M. californianus (in addition or apart from M. trossulus) could cause reduced epibiotic species richness and diversity. These findings demonstrate the importance of multiple mechanisms conferring biotic resistance to an invader and highlight the danger of overlooking invasions of cryptic species.

ISBN: 9780549254409Subjects--Topical Terms:

1017726
Biology, Ecology.

Invasion ecology of Mytilus galloprovincialis: Competitor and predator effects regulating its establishment and its potential impact as an exotic foundation species.
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245 1 0 $a Invasion ecology of Mytilus galloprovincialis: Competitor and predator effects regulating its establishment and its potential impact as an exotic foundation species.
300 $a 111 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 5700.
502 $a Thesis (Ph.D.)--University of California, Davis, 2007.
520 $a The rocky intertidal communities of central and northern California mark the invasion front the Mediterranean bay mussel, Mytilus galloprovincialis. This work examined whether native predators or native mussel competitors (Mytilus trossulus and Mytilus californianus) generate biotic resistance to the invader. In field and laboratory Mytilus spp. monocultures and polycultures, M. galloprovincialis growth rates always exceeded the two native mussels, indicating that competition does not limit the growth or spread of the invader. Furthermore, M. galloprovincialis consistently led to reduced growth and survival of M. trossulus by restricting movement, smothering and interfering with filter feeding of mussels. Although interference and exploitation competition among Mytilus spp. gave M. galloprovincialis a competitive advantage, M. galloprovincialis was more vulnerable to predators than the native species. In laboratory prey preference feeding trials among common intertidal predators (the seastar, Pisaster ochraceus, the crab, Cancer antennarius, and the dogwhelk Nucella ostrina), predators all tended to consume M. trossulus and M. galloprovincialis over M. californianus, but only N. ostrina showed a clear preference for M. trossulus. After 1 year in the field, predators did not completely eliminate outplants of M. galloprovincialis, suggesting that predation alone might not limit further invasion. The equivalence of biogenic habitat created by native and invasive Mytilus spp. was also examined via the development of epibiont communities associated with artificial mussel beds (shells only) and live mussels. Among artificial mussel beds, M. galloprovincialis and M. trossulus shells supported comparable species richness and diversity, indicating functional redundancy. Among living monocultures and polycultures of M. galloprovincialis and M. californianus, species richness and diversity was lowest on the shells of M. galloprovincialis. Species richness and diversity were always highest among artificial and living M. californianus beds. The displacement of M. trossulus by M. galloprovincialis may have minimal impact on associated community structure. However, continued spread of the invader at the expense of M. californianus (in addition or apart from M. trossulus) could cause reduced epibiotic species richness and diversity. These findings demonstrate the importance of multiple mechanisms conferring biotic resistance to an invader and highlight the danger of overlooking invasions of cryptic species.
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