BIOLOGIA GALLO-HELLENICA

2801978-79, this rose to 113 specics from lOG sites (71 M + 42 C). Followinghis continued studies in 1987-88, the st:ltus incrcased but slightly to 117 speciesfrom 137 sites (73 M + 44 C). This levelling ofT is rcal for those gastrotrichsthat arc restricted [0 the lilloral habitat of sandy beaches, but unfortunalclyis also parlly illusory, bec:luse the sublilloral habitats havc been undersampledin the British Isles, rebtive to those of northern continental Europe and Italy.FIG. 10 NORTHERN EUROPE FIG. Ie ITALY1>0'''''(f1 Vl'=:'100~IOOUUWWll. _-0 ll.(f14'-·:-' :",,-=_-:;: •• _~ (f1ciZ""••• !:,~,"'! --.'a:':"·""..-4o I '0 .0 160 1 ,~ 260 2~No. SITES150oZ'0o I ,0 ..0 1()O,II!>ONo. SITESFIG. lb ORITISH ISLES FIG. ld GREECEVIV1~100~IOOUww0. e - -=a.VI (f1o ~Oci !>OZZU?-~p' - ~'~'~'~'4"".t.,6''''',200oE ,i:.0 ,00 1~ :i&J 2~ 0 ~'o 100 ,~o 200 2~NO. SITE:S No. SITES""fig. I. Curvilinear rdationships bctm.:en the lllnnher of sites sampled and the numberof spccics round: a) lor continental northem Europ