{"refrec":{"BRefID":36456,"RR":"<b>Gaymer, C.F.; Himmelman, J.H.; Johnson, L.E.</b> (2002). Effect of intra- and interspecific interactions on the feeding behavior of two subtidal sea stars. <i>Mar. Ecol. Prog. Ser. 232</i>: 149-162","BEntID":36456,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 232</i>: 149-162","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gaymer, C.F.; Himmelman, J.H.; Johnson, L.E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gaymer, C.F.; Himmelman, J.H.; Johnson, L.E.","Englishabstract":"Competition and its effects are difficult to demonstrate, as they vary depending on the species present and the environmental conditions in each community. We conducted laboratory and field experiments to evaluate the effects of intra- and interspecific interactions on the use of food resources and behavior of the sea stars <i>Leptasterias polaris</i> and <i>Asterias vulgaris</i>, 2 major predators in subtidal communities of the northern Gulf of St. Lawrence. We demonstrate interference (encounter) competition between the two. For both species, the presence of the other (as detected by both contact and chemical signals) decreased feeding activity and provoked behavioral changes (avoidance, decrease in percentage feeding). These effects were reversible and short-lived, and were more pronounced when there was a shortage of food and when sea stars were exposed to simulated attacks by the other species (involving pedicellarial pinching). <i>L. polaris</i> seemed to be the inferior competitor as (1) it switched to less profitable prey size (smaller mussels, <i>Mytilus edulis</i>) when <i>A. vulgaris</i> was present, and (2) it avoided <i>A. vulgaris</i> and reduced its feeding activity when food was scarce. The dominance of <i>A. vulgaris</i> is possibly attenuated at our study site (near its northern distributional limit) by the reduction of its fitness when water temperatures are low (most of the year) and during the winter when it migrates to deeper water. Competition for food resources seems to occur periodically (mainly summer), in localized areas (patches and beds of mussels) or when sea stars form dense aggregations in which they are likely to interact frequently. Interactions, and thus the chance of competition, are less likely at greater depths. Coexistence seems to be permitted by both the attenuation of the dominance of <i>A. vulgaris</i> and by the great variations in how <i>L. polaris</i> and <i>A. vulgaris</i> interact (strongly affected by variations in prey availability, sea star abundance, and in the patterns of prey use by both sea stars).","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Effect of intra- and interspecific interactions on the feeding behavior of two subtidal sea stars","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2002,"MonPub":null,"DateUpdate":"2003-07-17","DateCreate":"2003-07-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000176123900013","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":36456,"PubliDate":2002,"Pagination":"149-162","XtraPublOfAnaID":null,"ISBN":null,"Volume":"232","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43354,"SerRR":"Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe.  ISSN 0171-8630; e-ISSN 1616-1599","StandardTitleSer":"Marine Ecology Progress Series","ISSN":"0171-8630","AbbrevSer":"Mar. Ecol. Prog. Ser.","StandardTitleMon":null,"StartPage":149,"Pages":14,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Gaymer","Firstname":"Carlos","Initials":"C.F.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":36456,"AutID":23835,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Himmelman","Firstname":"John","Initials":"J.H.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":36456,"AutID":3211,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Johnson","Firstname":"Ladd","Initials":"L.E.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":36456,"AutID":2213,"OrderNr":3,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":null,"litstyles":null,"thespers":null,"arch2discl":null,"SERpubls":[{"PublName":"Inter-Research","City":"Oldendorf/Luhe"}],"MONpubls":null,"pictures":[],"thestermsPath":null,"thestermsASFA":null,"taxtermsASFA":null,"geotermsASFA":null,"collections":null,"conf":null,"proj":null,"Physdatasets":null,"spcols":null,"doi":null,"publs":null,"serparttypes":null,"monauthors":null,"MParts":null,"SParts":null,"hLibs":null,"langs":[{"BEntID":36456,"AbstractFlag":0,"LangID":15,"LangCode":"en","Lang":"English","DutchTerm":"Engels","LangCodeExtended":"eng"}],"urls":null,"thesterms":null,"taxterms":null,"geoterms":null,"othterms":null,"asfacodes":null,"asfa2codes":null,"thestermsFRIS":null,"taxtermsFRIS":null,"geotermsFRIS":null,"othtermsFRIS":null,"resmessage":"","complete":1,"sessions":{"newSesName":"Milh, Dominique, D.","newSesDate":{"date":"2003-07-17 10:12:13.857000","timezone_type":3,"timezone":"Europe/Brussels"},"updSesName":"Milh, Dominique, D.","updSesDate":{"date":"2003-07-17 10:12:13.857000","timezone_type":3,"timezone":"Europe/Brussels"}}}