Inter-Research > MEPS > v602 > p169-181  
MEPS
Marine Ecology Progress Series

via Mailchimp

MEPS 602:169-181 (2018)  -  DOI: https://doi.org/10.3354/meps12712

Seasonal lipid storage and dietary preferences of native European versus invasive Asian shore crabs

Simon Jungblut1,2,*, Morgan L. McCarthy1,2,3, Karin Boos1,4, Reinhard Saborowski2, Wilhelm Hagen1

1Bremen Marine Ecology (BreMarE), Marine Zoology, University of Bremen, 28359 Bremen, Germany
2Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, 27570 Bremerhaven, Germany
3Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA
4MARUM - Center for Marine Environmental Sciences, University of Bremen, 28359 Bremen, Germany
*Corresponding author:

ABSTRACT: The invasive Asian shore crab Hemigrapsus sanguineus and the native European green crab Carcinus maenas share intertidal habitats along European North Atlantic shores and may compete for food. We evaluated the energy-storing capacities of the 2 species and determined their dietary preferences by means of lipid analysis and fatty acid trophic marker indices. Specimens of both sexes and various sizes were sampled in the rocky intertidal of the island of Helgoland (North Sea) in April, June, August, and October 2015. Total lipids of the midgut glands were significantly higher in H. sanguineus than in C. maenas and followed a distinct seasonal cycle in both sexes (ca. 20-50% of dry mass, DM). The lower lipid contents of C. maenas (ca. 20% of DM) remained at a similar level throughout the seasons. The seasonal differences in the females of H. sanguineus may be due to higher reproductive output and, consequently, lipid turnover, but remain unexplained in males. Trophic indices for Bacillariophyceae, Chlorophyta, and especially Phaeophyceae were higher in H. sanguineus than in C. maenas, suggesting a higher degree of herbivory of the invader. In contrast, the Rhodophyta index was higher in C. maenas. Thus, competition for food between the 2 species will probably be low in habitats rich in macroalgae. The ability of H. sanguineus to utilize mainly energy-poor algae but accumulate high-energy reserves may be an advantage for successfully establishing persistent populations in new habitats.


KEY WORDS: Asian shore crab · Hemigrapsus sanguineus · European green crab · Carcinus maenas · Competition · Trophic markers · Fatty acids · North Sea


Full text in pdf format
Supplement 1
Supplement 2
 
Cite this article as: Jungblut S, McCarthy ML, Boos K, Saborowski R, Hagen W (2018) Seasonal lipid storage and dietary preferences of native European versus invasive Asian shore crabs. Mar Ecol Prog Ser 602:169-181. https://doi.org/10.3354/meps12712

Export citation
Mail this link - Contents Mailing Lists - RSS
Facebook - - linkedIn