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Chapitre 4 : Impact of vegetation structure dynamics and usage on the nursery function<br />

of West European tidal salt-marshes.<br />

O<br />

Y<br />

J<br />

R<br />

Atherina presbyter<br />

Liza ramada<br />

Engraulis encrasicolus<br />

Sardina pilchardus<br />

Solea solea<br />

P<strong>la</strong>tichthys f<strong>les</strong>us<br />

Dicentrarchus <strong>la</strong>brax<br />

Liza aurata<br />

Sprattus sprattus<br />

Pomatoschistus microps<br />

Pomatoschistus minutus<br />

Cluster analysis<br />

0 2 4 6 8 10<br />

Dissimi<strong>la</strong>rity<br />

Figure 24 : Cluster analysis (Ward’s method, Euclidian distances) on fish popu<strong>la</strong>tion structures in<br />

Aiguillon bay (c<strong>la</strong>ssification by percentage of each year c<strong>la</strong>ss: young-of-the-year, juvenile, adult). Data<br />

have been log (x+1) transformed (Field, et al., 1982).<br />

Figure 24 : C<strong>la</strong>ssification Ascendante Hiérarchique (Métho<strong>de</strong> <strong>de</strong> Ward, distance euclidienne) <strong>de</strong>s<br />

structures <strong>de</strong> popu<strong>la</strong>tions <strong>de</strong> poissons <strong>de</strong> <strong>la</strong> baie <strong>de</strong> l’Aiguillon (<strong>les</strong> individus <strong>de</strong> chaque espèces sont<br />

c<strong>la</strong>ssés en pourcentage <strong>de</strong> chaque groupe : jeune <strong>de</strong> l’année, Juvénile, Adulte). Les données sont<br />

transformées en log (x+1) (Field, et al., 1982).<br />

128

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