{"refrec":{"BRefID":297665,"RR":"<b>Lang, A.C.; Buschbaum, C.</b> (2010). Facilitative effects of introduced Pacific oysters on native macroalgae are limited by a secondary invader, the seaweed <i>Sargassum muticum</i>. <i>J. Sea Res. 63(2)</i>: 119-128. <a href=\"https://dx.doi.org/10.1016/j.seares.2009.11.002\" target=\"_blank\">https://dx.doi.org/10.1016/j.seares.2009.11.002</a>","BEntID":289753,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Sea Res. 63(2)</i>: 119-128. <a href=\"https://dx.doi.org/10.1016/j.seares.2009.11.002\" target=\"_blank\">https://dx.doi.org/10.1016/j.seares.2009.11.002</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Lang, A.C.; Buschbaum, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Lang, A.C.; Buschbaum, C.","Englishabstract":"Introduced habitat-providing organisms such as epibenthic bivalves may facilitate the invasion and expansion of further non-native species which may modify the effects of the primary invader on the nativesystem. In the sedimentary intertidal Wadden Sea (south-eastern North Sea) introduced Pacific oysters (<i>Crassostrea gigas</i>) have overgrown native blue mussel beds (<i>Mytilus edulis</i>). These oyster beds are now providing the major attachment substratum for macroalgae. Recently, oysters have expanded their distribution into the shallow subtidal zone of the Wadden Sea, and there support a rich associated species community including the Japanese seaweed <i>Sargassum muticum</i>, which has been presumably introduced together with the oysters. With a block designed field experiment, we explored the effects of <i>S. muticum</i> on the associated community of soft-bottom <i>C. gigas</i> beds in the shallow subtidal. Replicated oyster plots of1 m<sup>2</sup> were arranged with a density of 0, 7, 15 or 45 S. muticum m<sup>−2</sup>, respectively. We found no effects of different <i>S. muticum</i> densities on associated epi- and endobenthic community compositions associated to the oyster plots. However, the overall coverage of sessile organisms settling on the oyster shells was significantly reduced at high <i>S. muticum</i> densities. The occurrence of abundant native macro-algal species such as <i>Polysiphonia nigrescens, Antithamnion plumula</i> and <i>Elachista fucicola</i> decreased with increasing <i>S. muticum</i> densities. Sessile invertebrates, by contrast, were only marginally affected and we found no effects of <i>S. muticum</i> canopy on diversity and abundance of endofauna organisms. We conclude that increasing densities of <i>S. muticum</i> on <i>C. gigas</i> beds in the shallow subtidal zone of the Wadden Sea limit the occurrence of native macroalgae which otherwise would benefit from the additional hard substratum provided by the oysters. Thus, a secondary invader may abolish the effects of the primary invader for native species by occupying the new formed niche.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Facilitative effects of introduced Pacific oysters on native macroalgae are limited by a secondary invader, the seaweed <i>Sargassum muticum</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-06 01:33:49.674678","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2010,"MonPub":null,"DateUpdate":"2018-07-13","DateCreate":"2018-07-05","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000275570500005","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.seares.2009.11.002"},"refs":null,"anarec":{"AnaID":297665,"PubliDate":2010,"Pagination":"119-128","XtraPublOfAnaID":null,"ISBN":null,"Volume":"63","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43261,"SerRR":"Journal of Sea Research. 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