{"refrec":{"BRefID":240662,"RR":"<b>Barnes, R.S.K.</b> (1998). Is the lagoonal mudsnail <i>Hydrobia neglecta</i> rare because of competitively-induced reproductive depression and, if so, what are the implications for its conservation? <i>Aquat. Conserv. 8(6)</i>: 737–744. <a href=\"http://dx.doi.org/10.1002/(SICI)1099-0755(1998110)8:6<737::AID-AQC312>3.0.CO;2-M\" target=\"_blank\">http://dx.doi.org/10.1002/(SICI)1099-0755(1998110)8:6<737::AID-AQC312>3.0.CO;2-M</a>","BEntID":232359,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":" <i>Aquat. Conserv. 8(6)</i>: 737–744. <a href=\"http://dx.doi.org/10.1002/(SICI)1099-0755(1998110)8:6<737::AID-AQC312>3.0.CO;2-M\" target=\"_blank\">http://dx.doi.org/10.1002/(SICI)1099-0755(1998110)8:6<737::AID-AQC312>3.0.CO;2-M</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Barnes, R.S.K.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Barnes, R.S.K.","Englishabstract":"<p>1. Females of the rare lagoonal mudsnail <em>Hydrobia neglecta</em> respond to increasing population density by a lowered output of eggs. The effect is even more marked when the widespread and abundant congener <em>H</em>. <em>ulvae</em> comprises part of a joint population. Thus, increasing the density by 50% from 18?000 <em>H. neglecta</em> per square metre decreases egg production by 30%, but when <em>H. ulvae</em> comprises 33% of the higher mudsnail density the decrease is 63%.</p></div><div class=\"para\"><p>2. Mortality of both male and female <em>H. neglecta</em> is also greater in the presence of <em>H. ulvae</em> than in its absence, whilst mortality of <em>H. ulvae</em> in mixed populations is minor.</p></div><div class=\"para\"><p>3. Since an allopatric female <em>H</em>. <em>neglecta</em> produces only 11–14 eggs during her expected reproductive lifetime, such a reduction of fecundity in the presence of moderate numbers of <em>H. ulvae</em> could prove disastrous for populations of <em>H. neglecta</em> closed to intraspecific immigration but open to invasion by <em>H. ulvae.</em> Such is the position in several areas, including the semi-isolated, landlocked lagoons that are the habitat of <em>H. neglecta</em> outside the Baltic Sea.</p></div><div class=\"para\"><p>4. This probably partly explains why <em>H. ulvae</em> and <em>H. neglecta</em> are rarely sympatric in such lagoons, and why <em>H. neglecta</em> is only common in Britain where <em>H. ulvae</em> is absent from the adjacent intertidal zone and unable to be washed into lagoons by overtopping. This has important repercussions on attempts to conserve this rare hydrobiid, and probably on other rare and legally-protected lagoonal species.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Is the lagoonal mudsnail <i>Hydrobia neglecta</i> rare because of competitively-induced reproductive depression and, if so, what are the implications for its conservation?","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-18 01:31:38.799064","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Reproductive depression","OtherDescriptors":null,"Notes":null,"AnaPub":1998,"MonPub":null,"DateUpdate":"2014-08-21","DateCreate":"2014-08-21","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000080428100002","VABBcode":null,"OpenAcc":0,"DOI":"10.1002/(SICI)1099-0755(1998110)8:6<737::AID-AQC312>3.0.CO;2-M"},"refs":null,"anarec":{"AnaID":240662,"PubliDate":1998,"Pagination":"737–744","XtraPublOfAnaID":null,"ISBN":null,"Volume":"8","Issue":"6","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42196,"SerRR":"Aquatic Conservation: Marine and Freshwater Ecosystems. 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