NDLI: Adaptive Multi-scale Sampling to Determine an Invasive Crab’s Habitat Usage and Range in New Zealand

Content Provider	Springer Nature Link
Author	Gust, Nick Inglis, Graeme J.
Copyright Year	2006
Abstract	Patterns of local abundance and geographical distribution are often prime correlates of invasive species’ impacts on native ecosystems. Here we adaptively increased the spatial scale of delimitation surveys to determine the local abundance, range and habitat associations of the introduced portunid Charybdis japonica (Milne-Edwards, 1861) in New Zealand. The crab was first discovered in Auckland’s Waitemata Harbour in September 2000, and by April 2002 trapping surveys revealed the invader had spread widely throughout the Harbour. Experiments using three deployment times (1, 3 and 24 h) optimized detection rates prior to larger scale geographic surveys that defined the range of the introduced population. We surveyed >300 sites in coastal waters within the predicted range of larval dispersal and then 14 major shipping ports throughout New Zealand. C. japonica was abundant in the Waitemata Harbour and present in two nearby estuaries, but there was no evidence of spread to other shipping ports nationwide. Subtidal habitat associations were explored in the main area of infestation which indicated that the invader occupied a range of substrata from fine, silty muds to coarse, shelly sands. Although its distribution overlaps with the native portunid crab Ovalipes catharus, the invader was more abundant throughout Waitemata Harbour and occurred in muddy sediments where native portunids are rare. It is not yet clear whether the C. japonica population in New Zealand is self-sustaining, however if it persists and continues to spread, it is likely to have significant impacts on native estuarine benthic assemblages.
Starting Page	339
Ending Page	353
Page Count	15
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	8
Issue Number	2
e-ISSN	15731464
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	adaptive sampling crabs delimitation surveys habitat use marine invasion optimising detection rates Ecology Hydrobiology Forestry Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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