{"refrec":{"BRefID":260526,"RR":"<b>Mokievsky, V.; Azovsky, A.</b> (2002). Re-evaluation of species diversity patterns of free-living marine nematodes. <i>Mar. Ecol. Prog. Ser. 238</i>: 101-108. <a href=\"http://dx.doi.org/10.3354/meps238101\" target=\"_blank\">http://dx.doi.org/10.3354/meps238101</a>","BEntID":252544,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 238</i>: 101-108. <a href=\"http://dx.doi.org/10.3354/meps238101\" target=\"_blank\">http://dx.doi.org/10.3354/meps238101</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Mokievsky, V.; Azovsky, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Mokievsky, V.; Azovsky, A.","Englishabstract":"Nematode species diversity was analysed for 55 data points ranging from local studies to large-scale faunal surveys. Multiple regression analysis uses latitude, investigated area, sampling effort and depth as independent variables. Species diversity in a biotope (or a-diversity) is about twice as high in the deep sea, while the main source of diversity in shallow waters is heterogeneity of biotopes (ß-diversity). For sites deeper than 100 m, regional species richness shows a unimodal (hump-shaped) latitudinal pattern, with the highest diversity at 30° to 60°N. Species diversity in shallow waters does not show any prominent gradients throughout the world ocean. These patterns possibly reflect the diversity-productivity relationships. Different approaches to estimation of species diversity are discussed. 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