Distribution and Habitat Use of the Invasive Carcinus maenas L. (European Green Crab) and the Native Cancer irroratus (Say) (Rock Crab) in Intertidal Zones in the Upper Bay of Fundy, Canada

2018 ◽  
Vol 25 (1) ◽  
pp. 161-180 ◽  
Author(s):  
Amelia J. MacDonald ◽  
Hannah M. Kienzle ◽  
David Drolet ◽  
Diana J. Hamilton
Keyword(s):  
Habitat Use ◽  
Carcinus Maenas ◽  
Green Crab ◽  
Bay Of Fundy ◽  
Intertidal Zones ◽  
Cancer Irroratus ◽  
European Green Crab ◽  
Rock Crab

scholarly journals A field-based investigation of behavioural interactions between invasive green crab (Carcinus maenas), rock crab (Cancer irroratus), and American lobster (Homarus americanus) in southern Newfoundland

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8444
Author(s):  
Nicola Zargarpour ◽  
Cynthia H. McKenzie ◽  
Brett Favaro
Keyword(s):  
Carcinus Maenas ◽  
Positive Association ◽  
Homarus Americanus ◽  
Green Crab ◽  
American Lobster ◽  
Catch Per Unit Effort ◽  
Cancer Irroratus ◽  
Species Invasions ◽  
Rock Crab ◽  
Catch Rates

Marine species invasions pose a global threat to native biodiversity and commercial fisheries. The European green crab (Carcinus maenas) is one of the most successful marine invaders worldwide and has, in the last decade, invaded the southern and western coastal waters of the island of Newfoundland, Newfoundland and Labrador (NL), Canada. Impacts of green crab on the American lobster (Homarus americanus), which are native to Newfoundland, are not well understood, particularly for interactions around deployed fishing gear. Declines in lobster catch rates in invaded systems (i.e., Placentia Bay, NL), have prompted concerns among lobster fishers that green crab are interfering with lobster catch. Here, we conducted a field experiment in a recently-invaded bay (2013) in which we deployed lobster traps pre-stocked with green crab, native rock crab (Cancer irroratus) (a procedural control), or empty (control). We compared catch per unit effort across each category, and used underwater cameras to directly observe trap performance in situ. In addition, we used SCUBA surveys to determine the correlation between ambient density of lobster and green crab in the ecosystem and the catch processes of lobster in traps. We found: (1) Regardless of the species of crab stocked, crab presence reduced the total number of lobster that attempted to enter the trap, and also reduced entry success rate, (2) lobster consumed green crab, rock crab and other lobster inside traps and (3) there was a positive association between lobster catch and ambient lobster density. Our results suggest that while there was a relationship between in-trap crab density and trap catch rates, it was not linked to the non-native/native status of the crab species.

Population dynamics of three brachyuran crab species (Decapoda) in Icelandic waters: impact of recent colonization of the Atlantic rock crab (Cancer irroratus)

2020 ◽  
Author(s):  
Sindri Gíslason ◽  
Snæbjörn Pálsson ◽  
Jónas P Jónasson ◽  
Hermann Dreki Guls ◽  
Jörundur Svavarsson ◽  
...  
Keyword(s):  
Native Species ◽  
Carcinus Maenas ◽  
Green Crab ◽  
Spider Crab ◽  
Crab Species ◽  
Brachyuran Crab ◽  
Cancer Irroratus ◽  
Rock Crab ◽  
Average Size ◽  
Icelandic Waters

Abstract The Atlantic rock crab (Cancer irroratus) was first found in Icelandic waters in 2006. Since then, the species has dispersed rapidly and is currently found clockwise from the southwest coast of Iceland to the east, corresponding to >70% of the coastline. Here, we present a monitoring study on this non-indigenous crab species in Iceland from 2007 to 2019. The study shows that the rock crab is now the most abundant brachyuran crab species on soft substrate bottoms in Southwest Iceland, both as adults and planktonic larvae, indicating that it is outcompeting its rival native species, the European green crab (Carcinus maenas) and the spider crab (Hyas araneus). The average size of the rock crab was similar over time (2007–2019), although it fluctuated between years in a pattern similar to that for the green crab, while significant reduction in size was observed for male spider crabs. The rock crab population is still in a growth phase in Icelandic waters, as seen in increasing distributional range, and can be found in densities comparable to the highest reported for the species in its native range in North America.

Linking eelgrass decline and impacts on associated fish communities to European green crab Carcinus maenas invasion

2016 ◽  
Vol 548 ◽  
pp. 31-45 ◽  
Author(s):  
K Matheson ◽  
CH McKenzie ◽  
RS Gregory ◽  
DA Robichaud ◽  
IR Bradbury ◽  
...  
Keyword(s):  
Carcinus Maenas ◽  
Fish Communities ◽  
Green Crab ◽  
European Green Crab
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