Differences in stress tolerance and brood size between a non-indigenous and an indigenous gammarid in the northern Baltic Sea.

Sareyka, Jörg, Kraufvelin, Patrik, Lenz, Mark, Lindström, Magnus, Tollrian, Ralph and Wahl, Martin (2011) Differences in stress tolerance and brood size between a non-indigenous and an indigenous gammarid in the northern Baltic Sea. Marine Biology, 158 . pp. 2001-2008. DOI 10.1007/s00227-011-1708-5.

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Abstract

Differences in stress tolerance and reproductive traits may drive the competitive hierarchy between nonindigenous and indigenous species and turn the former ones into successful invaders. In the northern Baltic Sea, the non-indigenous Gammarus tigrinus is a recent invader of littoral ecosystems and now occupies comparable ecological niches as the indigenous G. zaddachi. In laboratory experiments on specimens collected between June and August 2009 around Tva¨rminne in southern Finland (59°500N/23°150E), the tolerances towards heat stress and hypoxia were determined for the two species using lethal time, LT50, as response variable. The brood size of the two species was also studied and some observations were made on maturation of juveniles. Gammarus tigrinus was more resistant to hypoxia and survived at higher temperatures than G. zaddachi. Brood size was also greater in G. tigrinus than in G. zaddachi and G. tigrinus matured at a smaller size and earlier than G. zaddachi. Hence, there are clear competitive advantages for the non-indigenous G. tigrinus compared to the indigenous G. zaddachi, and these may be further strengthened through ongoing environmental changes related to increased eutrophication and a warming climate in the Baltic Sea region.

Document Type: Article
Keywords: Benthic Ecology; Northern Baltic Sea; Gammarus tigrinus; G. zaddachi
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s00227-011-1708-5
ISSN: 0025-3162
Projects: GAME, Future Ocean
Date Deposited: 24 May 2011 12:24
Last Modified: 08 Jun 2018 08:05
URI: http://oceanrep.geomar.de/id/eprint/11875

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