{"refrec":{"BRefID":121259,"RR":"<b>Sitts, R.M.; Knight, A.W.</b> (1979). Predation by the estuarine shrimps <i>Crangon franciscorum</i> Stimpson and <i>Palaemon macrodactylus</i> Rathbun. <i>Biol. Bull. 156(3)</i>: 356-368. <a href=\"https://dx.doi.org/10.2307/1540923\" target=\"_blank\">https://dx.doi.org/10.2307/1540923</a>","BEntID":115356,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Biol. Bull. 156(3)</i>: 356-368. <a href=\"https://dx.doi.org/10.2307/1540923\" target=\"_blank\">https://dx.doi.org/10.2307/1540923</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Sitts, R.M.; Knight, A.W.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Sitts, R.M.; Knight, A.W.","Englishabstract":"1. Feeding studies were conducted on the caridean shrimps <i>Crangon franciscorum</i> and <i>Palaemon macrodactylus</i> of the Sacramento-San Joaquin Estuary, California. Foregut contents from 352 specimens of <i>C. Franciscorum</i> and 198 specimens of <i>P. Macrodactylus</i> collected over six diel cycles in 1976 were itemized.2. <i>C. Franciscorum</i> and <i>P. Macrodactylus</i> are mainly carnivorous. Animal material always exceeded plant fragments in frequency of occurrence in foreguts, being respectively 46 to 86% and 7 to 61% in <i>C. Franciscorum</i> and 74 to 92% and 0 to 59% in <i>P. Macrodactylus</i>. The most frequent prey item identifiable in both predators was the mysid shrimp <i>Neomysis mercedis</i>. Both predators selected for <i>N. Mercedis</i> of intermediate lengths (5 to 9 mm), and selected against those 2 mm or > 10 mm long.3. Day and night differences in the number of individuals of <i>N. Mercedis</i> per foregut were significant only for <i>C. Franciscorum</i>, and then only in late September and late November, with greater means at night in each case.4. The percentages of <i>N. Mercedis</i> standing crops consumed daily by <i>C. Franciscorum</i> and <i>P. Macrodactylus</i> respectively, ranged from 0.1 to 6.2% and 0.0 to 4.8% in terms of individuals, and from 0.1 to 5.1% and 0.0 to 3.7% for biomass. The percent of their respective population biomasses that specimens of <i>C. Franciscorum</i> and <i>P. Macrodactylus</i> respectively consumed daily as <i>N. Mercedis</i> ranged from 1 to 3% and 1 to 4%. Similarities between these predators suggest the possibility of competition.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Predation by the estuarine shrimps <i>Crangon franciscorum</i> Stimpson and <i>Palaemon macrodactylus</i> Rathbun","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-03 01:31:04.128144","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1979,"MonPub":null,"DateUpdate":"2008-04-03","DateCreate":"2008-04-03","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1979HC88300008","VABBcode":null,"OpenAcc":1,"DOI":"10.2307/1540923"},"refs":null,"anarec":{"AnaID":121259,"PubliDate":1979,"Pagination":"356-368","XtraPublOfAnaID":null,"ISBN":null,"Volume":"156","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42437,"SerRR":"The Biological Bulletin. Marine Biological Laboratory: Lancaster.  ISSN 0006-3185; e-ISSN 1939-8697","StandardTitleSer":"The Biological Bulletin","ISSN":"0006-3185","AbbrevSer":"Biol. 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