NDLI: The impact of yellow shore crabs,Hemigrapsus oregonensis, on Early Benthic Phase dungeness crabs,Cancer magister, in intertidal oyster shell mitigation habitat

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The impact of yellow shore crabs,Hemigrapsus oregonensis, on Early Benthic Phase dungeness crabs,Cancer magister, in intertidal oyster shell mitigation habitat

Phytoplankton community composition and size distribution in the Langat River estuary, Malaysia

Assessing the use of saltmarsh flats by fish in a temperate Australian embayment

Nekton habitat quality at shallow water sites in two Rhode Island coastal systems

Estuaries : Volume 27, Issue 3, June 2004

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Estuaries : Volume 27, Issue 1, February 2004

Estuaries : Volume 26

Estuaries : Volume 25

Estuaries : Volume 24

Estuaries : Volume 23

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The impact of yellow shore crabs,Hemigrapsus oregonensis, on Early Benthic Phase dungeness crabs,Cancer magister, in intertidal oyster shell mitigation habitat

Content Provider	Springer Nature Link
Author	Visser, Eileen P. McDonald, P. Sean Armstrong, David A.
Copyright Year	2004
Abstract	Dungeness crab (Cancer magister) megalopae recruit to northeastern Pacific coastal estuaries, and settle into intertidal and subtidal habitats where they molt into Early Benthic Phase (EBP) crabs, and are dependent on epibenthic structure for shelter from predation. Given the importance of shell refuge to their post-settlement ontogeny, the U.S. Army Corps of Engineers began constructing intertidal plots of oyster shell in the Grays Harbor estuary, Washington, to enhance recruitment and mitigate losses of subtidalC. magister entrained and killed during extensive dredging efforts. When shell habitat was newly constructed, settlement and survival ofC. magister were high, and expectations for the mitigation project were met. During the first several years (1992-1997), plots greater than 1 yr postconstruction were colonized by yellow shore crabs,Hemigrapsus oregonensis (often≥75 crabs m$^{−2}$, and abundance of EBPC. magister was reduced to nearly zero. While some predation of settling megalopae byH. oregonensis does occur, the relationship between these species is characterized by density-dependent competitive interactions. Laboratory observations of competition for shell habitat indicate thatH. oregonensis are dominant over EBPC. magister and can evictC. magister from refuge spaces. Field experiments show that high densities of the former cause, the latter to emigrate from shell, and suggest detection and avoidance of areas with high densities ofH. oregonensis by settlingC. magister megalopae. More recently (1998-2001), abundance ofH. oregonensis has declined dramatically within plots of oyster shell, apparently due to recruitment failure, and patterns ofC. magister abundance and production have returned to levels consistent with original expectations of the mitigation project. Both intraspecific and interspecific competition for space are significant factors effecting population, regulation ofC. magister when they are strongly dependent on refuge from predation. Efficacy of constructed oyster shell plots as a mitigation tool may hinge on the population dynamics of a species previously considered of little consequence to the target species.
Starting Page	699
Ending Page	715
Page Count	17
File Format	PDF
ISSN	01608347
Journal	Estuaries
Volume Number	27
Issue Number	4
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Environment Ecology Geosciences Freshwater & Marine Ecology Environmental Management Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Aquatic Science Environmental Science

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The impact of yellow shore crabs,Hemigrapsus oregonensis, on Early Benthic Phase dungeness crabs,Cancer magister, in intertidal oyster shell mitigation habitat

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