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The biogeographic history of the relictual Gondwanan lineage of Australian burrowing crayfish
Hydrobiologia ( IF 2.2 ) Pub Date : 2020-11-03 , DOI: 10.1007/s10750-020-04448-y
Kathryn L. Dawkins , James M. Furse , Jane M. Hughes

Biogeographic investigations of Gondwanan mesic Australian fauna are scarce. The burrowing clade of Australian freshwater crayfish represent an ideal group to provide biogeographic inferences, due to their extensive distribution across the continent and their presumed ancient origin. This study tested the competing hypotheses of a ‘early’ versus ‘late’ origin of this clade, coinciding with the early or late fragmentation of Gondwana, respectively. The biogeographic history of this group was investigated through: (a) examination of the phylogenetic relationships between the seven extant taxon groups; (b) reconstruction of four species trees, each using a different calibration method; and (c) reconstruction of ancestral ranges and correlation of estimated dispersal and vicariance events with historical geological data to propose plausible mechanisms responsible for driving diversification. The phylogenetic relationships between the taxon groups were generally well supported (although some uncertainty exists for the oldest genera), and all calibration methods produced concordant results. The hypothesis that the clade arose during the early fragmentation of Gondwana in southern Australia is supported. Divergence between the extant taxa likely resulted from a combination of both short- and long-distance dispersal events (often followed by later vicariance), coincident with phases of sea level oscillation and changing climate continuing into the Eocene.

中文翻译:

澳大利亚穴居小龙虾遗存冈瓦纳世系的生物地理历史

对冈瓦纳中型澳大利亚动物群的生物地理学调查很少。澳大利亚淡水小龙虾的穴居进化枝代表了提供生物地理推断的理想群体,因为它们在整个大陆广泛分布,并且推测它们的古老起源。这项研究测试了这个进化枝的“早期”和“晚期”起源的竞争假设,分别与冈瓦纳大陆的早期或晚期分裂相吻合。该组的生物地理历史通过以下方式进行调查: (a) 检查现存的七个分类群之间的系统发育关系;(b) 重建四种树种,每种树种使用不同的校准方法;(c) 重建祖先范围并将估计的扩散和变异事件与历史地质数据相关联,以提出负责推动多样化的合理机制。分类群之间的系统发育关系普遍得到很好的支持(尽管最古老的属存在一些不确定性),并且所有校准方法都产生了一致的结果。该进化枝出现于澳大利亚南部冈瓦纳纪早期分裂的假设得到支持。现存分类群之间的差异可能是由短距离和长距离扩散事件(通常随后是后来的替代)的组合造成的,与海平面振荡和持续到始新世的气候变化阶段相吻合。分类群之间的系统发育关系普遍得到很好的支持(尽管最古老的属存在一些不确定性),并且所有校准方法都产生了一致的结果。该进化枝出现于澳大利亚南部冈瓦纳纪早期分裂的假设得到支持。现存分类群之间的差异可能是由短距离和长距离扩散事件(通常随后是后来的替代)的组合造成的,与海平面振荡和持续到始新世的气候变化阶段相吻合。分类群之间的系统发育关系普遍得到很好的支持(尽管最古老的属存在一些不确定性),并且所有校准方法都产生了一致的结果。该进化枝出现于澳大利亚南部冈瓦纳纪早期分裂的假设得到支持。现存分类群之间的差异可能是由短距离和长距离扩散事件(通常随后是后来的替代)的组合造成的,与海平面振荡和持续到始新世的气候变化阶段相吻合。
更新日期:2020-11-03
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