. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 240 S. LAPEGUE ET AL. A ** A* XX 123 IX ft* B • ft Xft 8 X* ft* *ft 10 *V X* A* ** > / - • "v »• 4 - •. • •• • Figure 4. (A) Giemsa-stained karyotype of African G-tmc.^/n/ Kisnr, (B) Giemsa-stained karyotype of putative C rhi;t>pliorae from French Guiana. (C) NOR-stained karyotype of African C. i>asar. (D) NOR-stained karyotype of putative C. rlii;n/>lioriit' from French Guiana. Scale bar = 5 persal by rafting was the most likely explanation for trans- pacific range extension by the flat oyster Ostrea
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 240 S. LAPEGUE ET AL. A ** A* XX 123 IX ft* B • ft Xft 8 X* ft* *ft 10 *V X* A* ** > / - • "v »• 4 - •. • •• • Figure 4. (A) Giemsa-stained karyotype of African G-tmc.^/n/ Kisnr, (B) Giemsa-stained karyotype of putative C rhi;t>pliorae from French Guiana. (C) NOR-stained karyotype of African C. i>asar. (D) NOR-stained karyotype of putative C. rlii;n/>lioriit' from French Guiana. Scale bar = 5 persal by rafting was the most likely explanation for trans- pacific range extension by the flat oyster Ostrea chilensis from New Zealand to Chile (O'Foighil el ai, 1999). The predominant surface circulation patterns in this part of the Atlantic Ocean (Fig. 1) favor the hypothesis that C. gasar was transported from Africa to America, as also hypothe- sized by Lessios el al. (1999) to explain the close genetic similarity of specimens of Eucidaris tribuloicles from the Caribbean Sea and Brazil to those from the Gulf of Guinea. Focusing on the Paraguana Bay (Brazil) where two spe- cies were found, PAR1 exhibited the C. gasur haplotype, but PAR2 and PAR3, both located in the same bay about 30 km away, exhibited the C. rhizophontc haplotype. One can ask whether these species are completely or incompletely reproductively isolated, and whether they have different habitats. A more intensive survey could provide an answer by revealing whether individuals from these species inhabit the same site, and whether hybrids occur in the wild. Based on the rRNA large subunit DNA sequences, and those known between other species in the genus (see Table 2), the genetic distance between C. gasar and C. rliizophorae is sufficiently large ( similarity) that they are unlikely to produce viable hybrids. Indeed, the genetic distance be- tween C. giitiM and C. virginicti. two species for which viable hybrids could not be obtained (Allen et til., 1993), is of similar value ( similarity). A
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
