{"refrec":{"BRefID":75971,"RR":"<b>Williams, R.; Lindley, J.A.</b> (1982). Variability in abundance, vertical distribution and ontogenetic migrations of <i>Thysanoessa longicaudata</i> (Crustacea: Euphausiacea) in the North-Eastern Atlantic Ocean. <i>Mar. Biol. (Berl.) 69(3)</i>: 321-330","BEntID":71621,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Mar. Biol. (Berl.) 69(3)</i>: 321-330","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Williams, R.; Lindley, J.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Williams, R.; Lindley, J.A.","Englishabstract":"The vertical distribution, seasonal and ontogenetic migrations and seasonal variability in abundance of <i>T. Longicaudata</i> (Kroeyer) were investigated using the Longhurst-Hardy Plankton Recorder for a 4 yr period (March, 1971 to May, 1975) at Ocean Weather Station \"I\" (59 degree 00'N; 19 degree 00'W) in the north-eastern Atlantic Ocean. Of 8 species of euphausiids identified at this position, the vast majority were <i>T. Longicaudata</i> From March to October the majority of calyptopes, furciliae and adults of <i>T. Longicaudata</i> were found in the upper 100m. The major spawning occurred in spring at a water temperature of 9 degree to 10 degree C and calyptopes and furciliae appeared in late April, reaching their maximum abundance in May. There was no evidence of large-scale diurnal migrations, although an extensive ontogenetic migration of young developmental stages was observed. The eggs were found from 100m down to 300m, the maximum depth of sampling, and the vertical distribution of the three naupliar stages showed a \"developmental ascent\" as they matured.   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