Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda)
Tropical Amphi-Pacific and trans-Pacific disjunctions are among the most controversial distribution patterns in biogeography. A disjunct distribution pattern between SE Asia (in fact, Indochina-Assam) and the Neotropics is rarely investigated in freshwater invertebrates. In the following, we give th...
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| Format: | Article |
| Language: | English |
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PAGEPress Publications
2013-12-01
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| Series: | Journal of Limnology |
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| Online Access: | http://www.jlimnol.it/index.php/jlimnol/article/view/766 |
| _version_ | 1818278813889462272 |
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| author | Kay Van Damme Artem Y. Sinev |
| author_facet | Kay Van Damme Artem Y. Sinev |
| author_sort | Kay Van Damme |
| collection | DOAJ |
| description | Tropical Amphi-Pacific and trans-Pacific disjunctions are among the most controversial distribution patterns in biogeography. A disjunct distribution pattern between SE Asia (in fact, Indochina-Assam) and the Neotropics is rarely investigated in freshwater invertebrates. In the following, we give the first review on potential tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda), a group of freshwater microcrustaceans. As a case study, we examine the littoral-benthic freshwater genus <em>Leydigiopsis</em> Sars, 1901 (Cladocera: Anomopoda: Chydoridae). The lineage has four known species in the Neotropics and we examine the status of <em>Leydigiopsis</em> records from Indochina and Assam (India). Our morphological study shows that the Oriental <em>Leydigiopsis</em> is not a humanmediated introduced species from South America. The populations belong to a distinct species, which we describe as new from Thailand and Vietnam. We discuss the biogeography of <em>Leydigiopsis</em> and examine possible hypotheses underlying the observed distribution pattern <em>(e.g.</em> transoceanic long-distance dispersal, boreotropical migration scenario, African extinction scenario). Our case study shows that a boreotropical origin seems the most plausible scenario for the current distribution of this tropical chydorid lineage. In the absence of a good fossil record, we propose that a comparison with biogeographical hypotheses of plants, may provide useful analogies when studying anomopod biogeography, because ephippia, the propagules for dispersal, functionally act as minute aquatic plant seeds. We list other examples of potential tropical Amphi-or trans-Pacific disjunctions in the Cladocera, based on phenotypes and we provide an updated key to the <em>Leydigiopsis</em> species of the world. Undersampling, taxonomical bias, the absence of molecular data and a poor fossil record, remain the most important obstacles for studying biogeography in non-planktonic tropical freshwater zooplankton. |
| first_indexed | 2024-12-12T23:23:24Z |
| format | Article |
| id | doaj.art-df23d87af8834818b842a3f458895c79 |
| institution | Directory Open Access Journal |
| issn | 1129-5767 1723-8633 |
| language | English |
| last_indexed | 2024-12-12T23:23:24Z |
| publishDate | 2013-12-01 |
| publisher | PAGEPress Publications |
| record_format | Article |
| series | Journal of Limnology |
| spelling | doaj.art-df23d87af8834818b842a3f458895c792022-12-22T00:08:13ZengPAGEPress PublicationsJournal of Limnology1129-57671723-86332013-12-0172s2e11e1110.4081/jlimnol.2013.s2.e11589Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda)Kay Van Damme0Artem Y. Sinev1University of BirminghamM.V. Lomonosov Moscow State UniversityTropical Amphi-Pacific and trans-Pacific disjunctions are among the most controversial distribution patterns in biogeography. A disjunct distribution pattern between SE Asia (in fact, Indochina-Assam) and the Neotropics is rarely investigated in freshwater invertebrates. In the following, we give the first review on potential tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda), a group of freshwater microcrustaceans. As a case study, we examine the littoral-benthic freshwater genus <em>Leydigiopsis</em> Sars, 1901 (Cladocera: Anomopoda: Chydoridae). The lineage has four known species in the Neotropics and we examine the status of <em>Leydigiopsis</em> records from Indochina and Assam (India). Our morphological study shows that the Oriental <em>Leydigiopsis</em> is not a humanmediated introduced species from South America. The populations belong to a distinct species, which we describe as new from Thailand and Vietnam. We discuss the biogeography of <em>Leydigiopsis</em> and examine possible hypotheses underlying the observed distribution pattern <em>(e.g.</em> transoceanic long-distance dispersal, boreotropical migration scenario, African extinction scenario). Our case study shows that a boreotropical origin seems the most plausible scenario for the current distribution of this tropical chydorid lineage. In the absence of a good fossil record, we propose that a comparison with biogeographical hypotheses of plants, may provide useful analogies when studying anomopod biogeography, because ephippia, the propagules for dispersal, functionally act as minute aquatic plant seeds. We list other examples of potential tropical Amphi-or trans-Pacific disjunctions in the Cladocera, based on phenotypes and we provide an updated key to the <em>Leydigiopsis</em> species of the world. Undersampling, taxonomical bias, the absence of molecular data and a poor fossil record, remain the most important obstacles for studying biogeography in non-planktonic tropical freshwater zooplankton.http://www.jlimnol.it/index.php/jlimnol/article/view/766Cladocera systematics, biogeography, Leydigiopsis pulchra n. sp., tropical Amphi-Pacific disjunctions, boreotropics, SE Asia. |
| spellingShingle | Kay Van Damme Artem Y. Sinev Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda) Journal of Limnology Cladocera systematics, biogeography, Leydigiopsis pulchra n. sp., tropical Amphi-Pacific disjunctions, boreotropics, SE Asia. |
| title | Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda) |
| title_full | Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda) |
| title_fullStr | Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda) |
| title_full_unstemmed | Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda) |
| title_short | Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda) |
| title_sort | tropical amphi pacific disjunctions in the cladocera crustacea branchiopoda |
| topic | Cladocera systematics, biogeography, Leydigiopsis pulchra n. sp., tropical Amphi-Pacific disjunctions, boreotropics, SE Asia. |
| url | http://www.jlimnol.it/index.php/jlimnol/article/view/766 |
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