NDLI: Invasion of a Reef-builder Polychaete: Direct and Indirect Impacts on the Native Benthic Community Structure

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Invertebrate Invasions on Pacific Islands and the Replacement of Unique Native Faunas: A Synthesis of the Land and Freshwater Snails*Contribution no. 2001-001 of Bishop Museum's Pacific Biological Survey.

Invasion of a Reef-builder Polychaete: Direct and Indirect Impacts on the Native Benthic Community Structure

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Invasion of a Reef-builder Polychaete: Direct and Indirect Impacts on the Native Benthic Community Structure

Content Provider	Springer Nature Link
Author	Schwindt, Evangelina Bortolus, Alejandro Iribarne, Oscar Osvaldo
Copyright Year	2001
Abstract	In this work, we evaluate the effect of the introduced reef-building polychaete Ficopomatus enigmaticus on the benthic community and on sediment characteristics of a southwestern Atlantic coastal lagoon. When reefs were experimentally added, density of the native crab Cyrtograpsus angulatus dramatically increased in a short time period. After reefs and crabs were experimentally transplanted as a unit, they decreased the density of the free-living soft-bottom polychaetes Heteromastus similis and Laeonereis acuta. Exclusion/inclusion caging experiments showed that Cyrtograpsus negatively affect the density of soft-bottom polychaetes (H. similis, L. acuta, Nephtys fluviatilis) and ostracodes. Our results showed that this effect is much higher in areas populated by reefs because of the increased density of crabs that find shelter under the reefs. Thus, reefs have a cascading effect on the native benthic community within the areas colonized by them. Analysis of crab stomach contents indicated that crabs feed on a wide variety of prey, including infaunal organisms, small gastropods and also algae. When reefs and crabs were experimentally added, the amount of bivalve shells on superficial sediments increased. Our results suggest that this bivalve shell accumulation and sediment composition are due to the reworking activity of Cyrtograpsus in the sediment where they dig burrows. The invasive habits of Ficopomatus may be favoring crabs to have a major effect on the integrity of the native community in the lagoon. Ficopomatus should be considered a bioengineer organism by creating and regulating refuge for other species, altering the interactions between preexistent species and also by changing the physical factors of the invaded environment.
Starting Page	137
Ending Page	149
Page Count	13
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	3
Issue Number	2
e-ISSN	15731464
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Hydrobiology Forestry Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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