Comparative study of putative conspecific sponge populations from both sides of the Isthmus of Panama

被引:36
作者
Boury-Esnault, N
Klautau, M
Bézac, C
Wulff, J
Solé-Cava, AM
机构
[1] Univ Mediterranee, Ctr Oceanol Marseille, Marine Endoume Stn, CNRS,UMR 6540,DIMAR, F-13007 Marseille, France
[2] Univ Fed Rio de Janeiro, Inst Biol, Dept Genet, BR-21941 Rio De Janeiro, Brazil
[3] Middlebury Coll, Dept Biol, Middlebury, VT 05753 USA
[4] Univ Liverpool, Port Erin Marine Lab, Dept Environm & Evolutionary Biol, Port Erin, Man, England
关键词
D O I
10.1017/S0025315498000046
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
A morphological, cytological and genetic comparison of putative conspecific populations of Spirastrella SD Cf. mollis (Porifera: Demospongiae) from both sides of the Isthmus of Panama revealed a very high level of genetic differentiation together with morphological and cytological differences. The main differences were the distribution of the spirasters within the choanosome, the size and shape of spirasters 1, and the size and shape of inclusions within type I cells. Consequently these two populations clearly belong to different biological species. The Atlantic one, S. hartmani sp, nov corresponds to what previous authors have called S. cunctatrix in the Caribbean. The finding of this new species raises to three the number of Spirastrella spp. known from the Caribbean Sea. The Pacific species is named here S. sabogae sp. nov. The levels of gene divergence found between S. hartmani and S sabogae (Nei's genetic distance D = 2.30) were as high as those found between different genera in other groups of invertebrates. Similarly exceptionally high values of gene divergence have been found between other congeneric sponge species and may be indicative either of a higher rate of molecular evolution or a very slow rate of morphological evolution in the Porifera compared to other metazoans.
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页码:39 / 50
页数:12
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