{"refrec":{"BRefID":353661,"RR":"<b>Britton, R.H.</b> (1985). Life cycle and production of <i>Hydrobia acuta</i> Drap. (Gastropoda: Prosobranchia) in a hypersaline coastal lagoon. <i>Hydrobiologia 122(3)</i>: 219-230. <a href=\"https://dx.doi.org/10.1007/bf00018282\" target=\"_blank\">https://dx.doi.org/10.1007/bf00018282</a>","BEntID":351371,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Hydrobiologia 122(3)</i>: 219-230. <a href=\"https://dx.doi.org/10.1007/bf00018282\" target=\"_blank\">https://dx.doi.org/10.1007/bf00018282</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Britton, R.H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Britton, R.H.","Englishabstract":"The life cycle and annual production of <i>Hydrobia acuta</i> was studied in a hypersaline lagoon (s = 39‰ in summer), forming a part of solar salt works. Quantitative random samples were taken at regular intervals over a period of 15 months using a corer, and snails collected were counted and measured. Weight and biomass was calculated from a length-weight relationship and from measurements of ash content. <i>H. acuta</i> was a strictly annual species in the study lagoon. Recruitment takes place over a brief period in May and June, after which the breeding population dies. Growth of the new generation was slow during summer, probably due to the unfavourably high salinity. A period of rapid growth took place in autumn coinciding with a drop in salinity caused by rainfall. In winter <i>Hydrobia</i> hibernated by burrowing deeply into the sediment. Growth recommenced in spring when the lagoon was reflooded, but by this time the number of survivors was low.</p><p>The maximum density of snails was 6 000 m<sup>−2</sup> and maximum biomass 500 mg organic dry wt · m<sup>−2</sup>. Annual cohort production was estimated as 786 mg organic dry wt · m<sup>−2</sup> · a<sup>−1</sup>. These figures are low compared to other studies on hydrobiid snails, and for production in inland waters, but the value for annual P/B = 4.5 is typical for a univoltine species. The relevance of the results to foraging by wading birds (the main consumers), is discussed.</p>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Life cycle and production of <i>Hydrobia acuta</i> Drap. 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