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Titolo:
MEDITERRANEAN CAULERPA-TAXIFOLIA AND CAULERPA-MEXICANA (CHLOROPHYTA) ARE NOT CONSPECIFIC
Autore:
OLSEN JL; VALERO M; MEUSNIER I; BOELEBOS S; STAM WT;
Indirizzi:
UNIV GRONINGEN,CTR BIOL,CTR ECOL & EVOLUTIONARY STUDIES,DEPT MARINE BIOL,POSTBUS 14 NL-9750 AA HAREN NETHERLANDS UNIV LILLE 1,LAB GENET & EVOLUT POPULAT VEGETALE,CNRS,URA 1185 F-59655 VILLENEUVE DASCQ FRANCE
Titolo Testata:
Journal of phycology
fascicolo: 5, volume: 34, anno: 1998,
pagine: 850 - 856
SICI:
0022-3646(1998)34:5<850:MCAC(A>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR RDNA; SEQUENCES; CLADOPHOROPSIS; EVOLUTION; SEA;
Keywords:
CAULERPA MEXICANA; CAULERPA TAXIFOLIA; INTRODUCED SPECIES; ITS; MEDITERRANEAN INVASIONS; RDNA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
J.L. Olsen et al., "MEDITERRANEAN CAULERPA-TAXIFOLIA AND CAULERPA-MEXICANA (CHLOROPHYTA) ARE NOT CONSPECIFIC", Journal of phycology, 34(5), 1998, pp. 850-856

Abstract

In 1984, Caulerpa taxifolia (Vahl) C. Agardh was reported along the coast of Monaco, Over the past decade it has spread along 60 km of the Mediterranean coastline and presently represents a potential risk. to biodiversity, Several explanations have been advanced regarding the presence of C. taxifolia in the Mediterranean. One hypothesis maintains that the alga was introduced accidentally into the sea at Monaco, where it has been used as a decorative alga in aquaria. Caulerpa taxifoliahas not been reported in earlier marine floras of the Mediterranean and ifs sudden appearance has suggested that it may be a recent introduction. Another hypothesis proposes that C. taxifolia and Caulerpa mexicana Sonder ex Kutzing are morphological variants of one another and hence conspecific taxa. Caulerpa mexicana has been found in the eastern. Mediterranean since at least 1941. In order to establish the taxonomic identities of these taxa, individuals from five populations of C. taxifolia and four populations of C. mexicana were collected from within and outside of the Mediterranean. Comparative DNA sequence analysis of the nuclear ribosomal cistron, including the 3'-end of the 18S, ITS1, 5.8S, and ITS2 regions, show clear phylogenetic separation of the two taxa using parsimony and maximum likelihood analyses. Separation ismaintained whether the analyses are based on just the more conserved 18S data or just the fast-evolving spacers. The two species are thus not conspecific. For specimens of uncertain identity (i.e. taxifolia-mexicana intermediates), a PCR diagnostic amplification can easily be performed because the ITS1 in C. taxifolia is 36 nucleotides shorter than the ITS1 in C. mexicana. Whether or not C. taxifolia has been present for a longer period of time in the marine flora, either as a crypticendemic species or as the result of one or more introductions, represents an additional hypothesis that will require identification of biogeographic populations from throughout the world, as well as a population-level study of the Mediterranean region.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 13:21:52