Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
Medientyp:
E-Artikel
Titel:
Diversity and Diversification of the Macaronesian
Lauroid Spurges
Beteiligte:
Carine, Mark A.;
Reyes Betancort, Jorge Alfredo
Erschienen:
Organismo Autonomo de Museos y Centros del Cabildo de Tenerife, 2013
Erschienen in:
Vieraea Folia scientiarum biologicarum canariensium, 41 (2013) Vieraea 41, Seite 253-267
Sprache:
Spanisch
DOI:
10.31939/vieraea.2013.41.18
ISSN:
0210-945X
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>Samples of the Canarian-Madeiran E. mellifera from across its
range were sequenced for the nuclear ribosomal Internal Transcribed Spacer
region (ITS) to document the variation, investigate congruence between molecular data and infraspecific taxonomy, contrast the patterns with those documented in its sister species E. stygiana and consider the implications of the
results for our understanding of the evolution of the lauroid spurges in Macaronesia. Three ribotypes were recovered in E. mellifera. One was unique to
Madeira, a second was shared by Madeira and La Gomera and the third was
found in plants sampled from La Gomera, La Palma and Tenerife. The distribution of haplotypes is consistent with the pubescence of the synflorescence that is used to delimit two varieties. Comparing ITS patterns in E. mellifera with those documented in E. stygiana, a higher diversity and higher incidence of single island endemic ribotypes are evident in the latter, at odds
with the more general diversity patterns wherein the Canarian and Madeiran
floras both appear to harbour many more endemic species and a much higher
proportion of single island endemics than the Azores. Furthermore, phylogenetic analysis supports the monophyly of E. mellifera relative to E. stygiana.
Haplotypes of the latter form an unresolved polytomy in the strict consensus
tree but are resolved as paraphyletic with respect to E. mellifera in the semistrict consensus tree. In light of these results, we hypothesise that, in contrast
to other seed plants examined to date, the more southerly archipelagos of
Madeira and the Canaries may have been colonised from the Azores. Further
testing of this hypothesis with data from additional gene regions is necessary</jats:p>