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Systematics, biogeography, and evolu...

Lovejoy, Nathan Richard.

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Systematics, biogeography, and evolution of needlefishes (Teleostei: Belonidae).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Systematics, biogeography, and evolution of needlefishes (Teleostei: Belonidae)./
Author:	Lovejoy, Nathan Richard.
Description:	126 p.
Notes:	Source: Dissertation Abstracts International, Volume: 59-12, Section: B, page: 6224.
Contained By:	Dissertation Abstracts International59-12B.
Subject:	Biology, Zoology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9914623
ISBN:	0599132574

Systematics, biogeography, and evolution of needlefishes (Teleostei: Belonidae).
Lovejoy, Nathan Richard.

Systematics, biogeography, and evolution of needlefishes (Teleostei: Belonidae). - 126 p.

Source: Dissertation Abstracts International, Volume: 59-12, Section: B, page: 6224.

Thesis (Ph.D.)--Cornell University, 1999.

The relationships within needlefishes and between needlefishes and their close relatives were investigated using DNA sequences and morphological data. The results are used to interpret biogeographical and developmental evolution. The study was executed at three hierarchical levels. At the highest taxonomic level, the phylogenetic systematics of Beloniformes (needlefishes, sauries, halfbeaks and flyingfishes) were assessed using two mitochondrial genes (cytochrome b and 16SrRNA), an anonymous nuclear gene (Tmo-4C4), and several morphological characters. A new hypothesis was produced that differs significantly from current beloniform taxonomy. Neither halfbeaks nor needlefishes are monophyletic: flyingfishes are nested within halfbeaks, and sauries are nested within needlefishes. The Indo-West Pacific halfbeaks are the sister group of needlefishes and sauries. Importantly, the adult “halfbeak” morphology is plesiomorphic within beloniforms, resolving the longstanding quandary of whether halfbeaks are paedomorphic (developmentally arrested) needlefishes: they are not.

ISBN: 0599132574Subjects--Topical Terms:

1018632
Biology, Zoology.

Systematics, biogeography, and evolution of needlefishes (Teleostei: Belonidae).
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100 1 $a Lovejoy, Nathan Richard. $3 1943511
245 1 0 $a Systematics, biogeography, and evolution of needlefishes (Teleostei: Belonidae).
300 $a 126 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-12, Section: B, page: 6224.
500 $a Adviser: A. R. McCune.
502 $a Thesis (Ph.D.)--Cornell University, 1999.
520 $a The relationships within needlefishes and between needlefishes and their close relatives were investigated using DNA sequences and morphological data. The results are used to interpret biogeographical and developmental evolution. The study was executed at three hierarchical levels. At the highest taxonomic level, the phylogenetic systematics of Beloniformes (needlefishes, sauries, halfbeaks and flyingfishes) were assessed using two mitochondrial genes (cytochrome b and 16SrRNA), an anonymous nuclear gene (Tmo-4C4), and several morphological characters. A new hypothesis was produced that differs significantly from current beloniform taxonomy. Neither halfbeaks nor needlefishes are monophyletic: flyingfishes are nested within halfbeaks, and sauries are nested within needlefishes. The Indo-West Pacific halfbeaks are the sister group of needlefishes and sauries. Importantly, the adult “halfbeak” morphology is plesiomorphic within beloniforms, resolving the longstanding quandary of whether halfbeaks are paedomorphic (developmentally arrested) needlefishes: they are not.
520 $a Based on this analysis, a subgroup of needlefishes was selected for a detailed investigation of the evolutionary transition between marine and freshwater habitats. The “American” clade includes several Neotropical freshwater species and marine species distributed in the Atlantic and eastern Pacific. Relationships between these species was resolved by combining the previous dataset with sequence from an additional nuclear gene (RAG2). The resultant phylogeny suggests that four independent entries into freshwater habitats have taken place in the Neotropics. Two separate lineages moved into the large Atlantic drainages of South America (Amazon, Orinoco, Paraná, Guianas); the biogeography of these taxa is consistent with an origin resulting from Miocene marine incursions from the Caribbean.
520 $a At the finest taxonomic level, intraspecific relationships were investigated within the South American genus <italic>Potamorrhaphis</italic>. A mitochondrial DNA haplotype phylogeny was constructed from individuals sampled from several widespread localities. Significant geographic structure was observed, suggesting limited gene flow between the sampled localities. Relationships between haplotypes do not reflect current drainage patterns, thereby suggesting historical changes in river connections.
590 $a School code: 0058.
650 4 $a Biology, Zoology. $3 1018632
650 4 $a Biology, Ecology. $3 1017726
690 $a 0472
690 $a 0329
710 2 0 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 59-12B.
790 1 0 $a McCune, A. R., $e advisor
790 $a 0058
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9914623