{"refrec":{"BRefID":221076,"RR":"<b>Skov, M.; Vannini, M.; Shunula, J.; Hartnoll, R.G.; Cannicci, S.</b> (2002). Quantifying the density of mangrove crabs: Ocypodidae and Grapsidae. <i>Mar. Biol. (Berl.) 141(4)</i>: 725-732. <a href=\"http://dx.doi.org/10.1007/s00227-002-0867-9\" target=\"_blank\">dx.doi.org/10.1007/s00227-002-0867-9</a>","BEntID":212806,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Mar. Biol. (Berl.) 141(4)</i>: 725-732. <a href=\"https://dx.doi.org/10.1007/s00227-002-0867-9\" target=\"_blank\">https://dx.doi.org/10.1007/s00227-002-0867-9</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Skov, M.; Vannini, M.; Shunula, J.; Hartnoll, R.G.; Cannicci, S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Skov, M. <i>et al.</i>","Englishabstract":"Numerous studies have highlighted the importance of crabs within mangrove ecosystems, but tested methods of enumeration are virtually non-existent. The aim of the present study was to assess the accuracy of quick, non-invasive methods for estimating the population density of three species of mangrove crabs in East Africa: <i>Uca annulipes, Sesarma guttatum</i> and <i>Neosarmatium meinerti</i>. Methods employed depended on the behaviour and habitat of each species. Counts of <i>U. annulipes</i> and <i>N. meinerti</i> individuals that were active on the surface (visual counts) and burrow counts (of <i>U.annulipes</i>) were compared to actual densities. Actual densities were determined by excavation of <i>U.annulipes</i>, and by multiplying counts of <i>N. meinerti</i> burrows by the mean number of crabs per burrow. Visual counts of marked individuals of <i>S. guttatum</i> were compared to known densities of marked crabs. For <i>N. meinerti</i> two visual counting methods were tested: (1) instant counts – crabs were counted every 5 min during 0.5 h and the highest count taken; and (2) continuous counts – all burrows were tagged, and those from which a crab emerged during 0.5 h were totalled. For <i>U.annulipes</i> on Inhaca Island (Mozambique) visual counts underestimated excavated numbers by 27%, whereas burrow counts overestimated numbers by 46%. These values were similar for both sexes, and on both spring and neap tides. Burrow counts and visual counts estimated absolute numbers of <i>U. annulipes</i> with equal consistency. At Mida Creek (Kenya) visual counts underestimated <i>U.annulipes</i> numbers by 37%, again with no differences between spring and neap tides. In Zanzibar 81% of <i>N. meinerti</i> burrows contained a crab. The instant visual count underestimated <i>N. meinerti</i> numbers by 41%, the continuous count, by 12%. Visual counts of <i>S. guttatum</i> in Zanzibar (Tanzania) underestimated crab numbers by 49%.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Quantifying the density of mangrove crabs: Ocypodidae and Grapsidae","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-21 01:31:59.077186","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2002,"MonPub":null,"DateUpdate":"2013-08-08","DateCreate":"2012-12-12","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000179260900012","VABBcode":null,"OpenAcc":0,"DOI":"10.1007/s00227-002-0867-9"},"refs":null,"anarec":{"AnaID":221076,"PubliDate":2002,"Pagination":"725-732","XtraPublOfAnaID":null,"ISBN":null,"Volume":"141","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43352,"SerRR":"Marine Biology: International Journal on Life in Oceans and Coastal Waters. 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