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Colonization and speciation on volcanic islands: phylogeography of the flightless grasshopper genus Arminda (Orthoptera, Acrididae) on the Canary Islands

Identifieur interne : 001982 ( Istex/Corpus ); précédent : 001981; suivant : 001983

Colonization and speciation on volcanic islands: phylogeography of the flightless grasshopper genus Arminda (Orthoptera, Acrididae) on the Canary Islands

Auteurs : Axel Hochkirch ; Yvonne Görzig

Source :

RBID : ISTEX:E471BA463D44E538B7C167342BBA8373D4982B89

Abstract

Abstract Volcanic archipelagos represent excellent areas to study colonization and speciation processes. The grasshopper genus Arminda is one of many endemic taxa of the Canary Islands. It consists of seven wingless species, most of which are single‐island endemics. We sequenced two mitochondrial (12s rRNA, ND5) and two nuclear gene fragments (28s rRNA, ITS2) to reconstruct the colonization pattern of the genus. Our results are in accordance with a stepping‐stone colonization model from east to west, corresponding to the prevailing ocean currents, but alternative hypotheses cannot be fully rejected. The populations of A. brunneri from Tenerife belong to two different lineages (east and west) consistent with the geological history of the island. It remains to be tested whether these lineages represent different species and whether further lineages exist on this island. The five clades of the four western islands (A. brunneri group) have approximately similar branch lengths. The short internodes between these lineages resulted in a poorer phylogenetic resolution. Specimens from La Palma were genetically distinct and are subsequently described as a new species, Arminda palmae sp.n. Our results suggest in situ speciation on Gran Canaria, which was accompanied by a stronger degree of morphological diversification than the inter‐island speciation processes. The aberrant species A. canariensis has formerly been assigned to a monotypic subgenus Chopardminda, which is now synonymized with Arminda syn.n. based on its phylogenetic position. Gran Canaria seems to be the only island where Arminda species occur sympatrically, although allopatric speciation seems likely due to the long history of volcanism and erosion on the island.

Url:
DOI: 10.1111/j.1365-3113.2008.00449.x

Links to Exploration step

ISTEX:E471BA463D44E538B7C167342BBA8373D4982B89

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<div type="abstract">Abstract Volcanic archipelagos represent excellent areas to study colonization and speciation processes. The grasshopper genus Arminda is one of many endemic taxa of the Canary Islands. It consists of seven wingless species, most of which are single‐island endemics. We sequenced two mitochondrial (12s rRNA, ND5) and two nuclear gene fragments (28s rRNA, ITS2) to reconstruct the colonization pattern of the genus. Our results are in accordance with a stepping‐stone colonization model from east to west, corresponding to the prevailing ocean currents, but alternative hypotheses cannot be fully rejected. The populations of A. brunneri from Tenerife belong to two different lineages (east and west) consistent with the geological history of the island. It remains to be tested whether these lineages represent different species and whether further lineages exist on this island. The five clades of the four western islands (A. brunneri group) have approximately similar branch lengths. The short internodes between these lineages resulted in a poorer phylogenetic resolution. Specimens from La Palma were genetically distinct and are subsequently described as a new species, Arminda palmae sp.n. Our results suggest in situ speciation on Gran Canaria, which was accompanied by a stronger degree of morphological diversification than the inter‐island speciation processes. The aberrant species A. canariensis has formerly been assigned to a monotypic subgenus Chopardminda, which is now synonymized with Arminda syn.n. based on its phylogenetic position. Gran Canaria seems to be the only island where Arminda species occur sympatrically, although allopatric speciation seems likely due to the long history of volcanism and erosion on the island.</div>
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<p>Abstract Volcanic archipelagos represent excellent areas to study colonization and speciation processes. The grasshopper genus Arminda is one of many endemic taxa of the Canary Islands. It consists of seven wingless species, most of which are single‐island endemics. We sequenced two mitochondrial (12s rRNA, ND5) and two nuclear gene fragments (28s rRNA, ITS2) to reconstruct the colonization pattern of the genus. Our results are in accordance with a stepping‐stone colonization model from east to west, corresponding to the prevailing ocean currents, but alternative hypotheses cannot be fully rejected. The populations of A. brunneri from Tenerife belong to two different lineages (east and west) consistent with the geological history of the island. It remains to be tested whether these lineages represent different species and whether further lineages exist on this island. The five clades of the four western islands (A. brunneri group) have approximately similar branch lengths. The short internodes between these lineages resulted in a poorer phylogenetic resolution. Specimens from La Palma were genetically distinct and are subsequently described as a new species, Arminda palmae sp.n. Our results suggest in situ speciation on Gran Canaria, which was accompanied by a stronger degree of morphological diversification than the inter‐island speciation processes. The aberrant species A. canariensis has formerly been assigned to a monotypic subgenus Chopardminda, which is now synonymized with Arminda syn.n. based on its phylogenetic position. Gran Canaria seems to be the only island where Arminda species occur sympatrically, although allopatric speciation seems likely due to the long history of volcanism and erosion on the island.</p>
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<title type="main">Colonization and speciation on volcanic islands: phylogeography of the flightless grasshopper genus
<i>Arminda </i>
(Orthoptera, Acrididae) on the Canary Islands</title>
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Volcanic archipelagos represent excellent areas to study colonization and speciation processes. The grasshopper genus
<i>Arminda </i>
is one of many endemic taxa of the Canary Islands. It consists of seven wingless species, most of which are single‐island endemics. We sequenced two mitochondrial (12s rRNA, ND5) and two nuclear gene fragments (28s rRNA, ITS2) to reconstruct the colonization pattern of the genus. Our results are in accordance with a stepping‐stone colonization model from east to west, corresponding to the prevailing ocean currents, but alternative hypotheses cannot be fully rejected. The populations of
<i>A. brunneri </i>
from Tenerife belong to two different lineages (east and west) consistent with the geological history of the island. It remains to be tested whether these lineages represent different species and whether further lineages exist on this island. The five clades of the four western islands (
<i>A. brunneri </i>
group) have approximately similar branch lengths. The short internodes between these lineages resulted in a poorer phylogenetic resolution. Specimens from La Palma were genetically distinct and are subsequently described as a new species,
<i>Arminda palmae </i>
<b>sp.n. </b>
Our results suggest in situ speciation on Gran Canaria, which was accompanied by a stronger degree of morphological diversification than the inter‐island speciation processes. The aberrant species
<i>A. canariensis </i>
has formerly been assigned to a monotypic subgenus
<i>Chopardminda</i>
, which is now synonymized with
<i>Arminda </i>
<b>syn.n. </b>
based on its phylogenetic position. Gran Canaria seems to be the only island where
<i>Arminda </i>
species occur sympatrically, although allopatric speciation seems likely due to the long history of volcanism and erosion on the island.</p>
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<abstract>Abstract Volcanic archipelagos represent excellent areas to study colonization and speciation processes. The grasshopper genus Arminda is one of many endemic taxa of the Canary Islands. It consists of seven wingless species, most of which are single‐island endemics. We sequenced two mitochondrial (12s rRNA, ND5) and two nuclear gene fragments (28s rRNA, ITS2) to reconstruct the colonization pattern of the genus. Our results are in accordance with a stepping‐stone colonization model from east to west, corresponding to the prevailing ocean currents, but alternative hypotheses cannot be fully rejected. The populations of A. brunneri from Tenerife belong to two different lineages (east and west) consistent with the geological history of the island. It remains to be tested whether these lineages represent different species and whether further lineages exist on this island. The five clades of the four western islands (A. brunneri group) have approximately similar branch lengths. The short internodes between these lineages resulted in a poorer phylogenetic resolution. Specimens from La Palma were genetically distinct and are subsequently described as a new species, Arminda palmae sp.n. Our results suggest in situ speciation on Gran Canaria, which was accompanied by a stronger degree of morphological diversification than the inter‐island speciation processes. The aberrant species A. canariensis has formerly been assigned to a monotypic subgenus Chopardminda, which is now synonymized with Arminda syn.n. based on its phylogenetic position. Gran Canaria seems to be the only island where Arminda species occur sympatrically, although allopatric speciation seems likely due to the long history of volcanism and erosion on the island.</abstract>
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<title>Systematic Entomology</title>
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<identifier type="ISSN">0307-6970</identifier>
<identifier type="eISSN">1365-3113</identifier>
<identifier type="DOI">10.1111/(ISSN)1365-3113</identifier>
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<date>2009</date>
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<caption>vol.</caption>
<number>34</number>
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