e-journal

Is it really you, Orthotrichum acuminatum?Ascertaining a new case of intercontinental disjunction in mosses

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Intercontinental disjunct distributions are a main issue in current biogeography. Bryophytes usually have broad
distribution ranges and therefore constitute an interesting subject of study in this context. During recent fieldwork in western North America and eastern Africa, we found new populations of a moss morphologically similar to
Orthotrichum acuminatum. So far this species has been considered to be one of the most typical epiphytic mosses of
the Mediterranean Basin. The new findings raise some puzzling questions. Do these new populations belong to cryptic
species or do they belong to O. acuminatum, a species which then has a multiple-continent disjunct range? In the
latter case, how could such an intercontinental disjunction be explained? To answer these questions, an integrative
study involving morphological and molecular approaches was conducted. Morphological results reveal that
Californian and Ethiopian samples fall within the variability of those from the Mediterranean Basin. Similarly,
phylogenetic analyses confirm the monophyly of these populations, showing that O. acuminatum is one of the few
moss species with a distribution comprising the western Nearctic, the western Palaearctic and Palaeotropical eastern
Africa. Pending a further genetic and phylogeographical study to support or reject the hypothesis, a process of
long-distance dispersal (LDD) is hypothesized to explain this distribution and the origin of the species is suggested to be the Mediterranean Basin, from where diaspores of the species may have migrated to California and Ethiopia.
The spore release process in O. acuminatum is revisited to support the LDD hypothesis.

ADDITIONAL KEYWORDS: biogeography – bryophytes – California – eastern Africa – Ethiopia – hygrocastique
spore release – long-distance dispersal – Mediterranean – Orthotrichaceae – taxonomy.

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Ketersediaan

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Informasi Detail

Judul Seri

Botanical Journal of the Linnean Society,

No. Panggil

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Penerbit

: The Linnean Society of London., 2016

Deskripsi Fisik

Botanical Journal of the Linnean Society, 2016, 180, 30–49.

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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