First molecular scombrid timetree (Percomorpha: Scombridae) shows recent radiation of tunas following invasion of pelagic habitat

作者：Santini F; Carnevale G^*; Sorenson L

来源：Italian Journal of Zoology, 2013, 80(2): 210-221.

DOI：10.1080/11250003.2013.775366

• Phylogeny
• molecular clock
• fossils
• Scombridae
• radiation

Scombrid fishes represent one of the major radiations of marine vertebrates in the pelagic realm, and have historically been a commercially important group. Their rich fossil record dates to the Late Paleocene, and it has recently been suggested that the current scombrid diversity is due to a post-Cretaceous radiation that saw the survivors of the KPg extinction replace a number of non-acanthomorph fish lineages that did not survive the Mesozoic Era. In this paper we present the result of the first quantitative macroevolutionary study of scombrid evolution. We assembled a supermatrix consisting of seven nuclear and mitochondrial loci, including 47 of the 52 extant scombrid species. We then used seven fossils to time-calibrate this new molecular phylogeny, the first ever assembled for scombrids that included more than 50% of the diversity of this family, and investigated macroevolutionary patterns within this clade. Our results support a Late Cretaceous origin of the scombrids, and show that many lineages originated in the Eocene and Oligocene. Our findings, however, fail to support the hypothesis of a rapid scombrid radiation in the post-KPg ecosystems. We show how the most significant radiation within scombrids has taken place since the Late Miocene in tunas, possibly triggered by a transition from pelagic-neritic to pelagic-oceanic habitats, and matched by a dramatic increase in body size.

• 出版日期2013-6-1