. Bulletin. Science. VARIATION IN PARALABRAX MACULATOFASCIATUS -*-» o «-» s 3 +* C -? C8 c S '- u -4 V) $4 © *H 2 -6. San Diego Guerrero Negro Magdalena Bay Los Pulpos Bahia de Los Angeles La Paz -2 0 2 Discriminant function I Fig. 4. Morphometric scatterplot showing Discriminant Function III. Ellipsoids indicate 95% con- fidence limits. geographic position to these sites. The variation from La Paz to Magdalena Bay and then Bahia de Los Angeles is described by smaller pelvic fin and longest dorsal spine and increasing orbit to preopercle and gape width. Larger facial dimensions with DF I
. Bulletin. Science. VARIATION IN PARALABRAX MACULATOFASCIATUS -*-» o «-» s 3 +* C -? C8 c S '- u -4 V) $4 © *H 2 -6. San Diego Guerrero Negro Magdalena Bay Los Pulpos Bahia de Los Angeles La Paz -2 0 2 Discriminant function I Fig. 4. Morphometric scatterplot showing Discriminant Function III. Ellipsoids indicate 95% con- fidence limits. geographic position to these sites. The variation from La Paz to Magdalena Bay and then Bahia de Los Angeles is described by smaller pelvic fin and longest dorsal spine and increasing orbit to preopercle and gape width. Larger facial dimensions with DF III again describe the upper gulf region. Genetic analysis.—Frequencies of RFLP patterns were calculated for seven of the eleven restriction endonucleases that showed variation (Table 5). A phenogram obtained using Roger's (1972) genetic distance and UPGMA (Sneath and Sokal 1973) clusters the six populations (Fig. 5). G-test results indicate that the gulf populations are genetically similar to one another and are significantly different from the three Pacific populations. The three Pacific populations form two sig- nificantly different groups. The northernmost Pacific population of San Diego is significantly different from the two southern-Pacific groups of Guerrero Negro and Magdalena Bay which are the most genetically similar of the six populations. Discussion The morphological and genetic results indicate that populations of P. macula- tofasciatus from the Baja California peninsula form a complex system which cannot simply be divided into disjunct Gulf and Pacific distributions. The morphometric results indicate that significant differentiation has occurred among populations from the range extremes. Morphometric DF I and DF II de- scribe these as discrete groups according to varying body shapes between these regions. The San Diego and Guerrero Negro populations are distinguished by smaller caudal peduncle, standard length, body depth, and fin characters. This indicates
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