e-journal

Morphological and genetic differentiation of Eremina desertorum (Gastropoda, Pulmonata, Helicidae) in Egypt

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To understand the processes that result in morphological and genetic diversity, we studied
the differentiation of the land snails Eremina d. desertorum and Eremina desertorum irregularis
in the deserts of northern Egypt. These two taxa are differentiated with regard to shell size
and shape and are separated by a narrow hybrid zone west of Alexandria. The lack of differences
in the genitalia and the lack of reciprocal monophyly of the mitochondrial haplotypes
of E. d. desertorum and E. desertorum irregularis support their classification as subspecies
rather than distinct species. Low genetic distances indicate that the differentiation is probably
less than half a million years old. The genetic data indicate a population expansion in
agreement with other evidence that the Nile region in northern Egypt was more humid
well into historical times than today. Shell size and shape are correlated with a climatic gradient
from cooler and more humid conditions along the Mediterranean coast to arid and
hot conditions in the interior. The decrease of body size with decreasing precipitation and
increasing temperature might be explained by limited time for food intake in the more arid
regions. The shape differences between the taxa are partly an indirect consequence of selection
for body size, but are also directly affected by selection for reduction of aperture size.

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Ketersediaan

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Informasi Detail

Judul Seri

Zoologica Scripta

No. Panggil

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Penerbit

Swedia : The Royal Swedish Academy of Sciences., 2016

Deskripsi Fisik

Zoologica Scripta 45, 1, January 2016, pp 48–61

Bahasa

English

ISBN/ISSN

doi:10.1111/zsc.1213

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

45, 1, January 2016

Subjek

ZOOLOGY

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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