The ichthyofaunistic colonization and complex biogeographic history of the southern portion of the Southwest Atlantic Ocean

Daniel E. Figueroa; Santiago A. Barbini; Mauro BelleggiaDavid E. SabadinJorge M. RománAgustín M. De Wysiecki

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The ichthyofaunistic colonization and complex biogeographic history of the southern portion of the Southwest Atlantic Ocean

机译：The ichthyofaunistic colonization and complex biogeographic history of the southern portion of the Southwest Atlantic Ocean

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Here, we highlight the geological processes that resulted in the current conformationof the southern Southwest Atlantic Ocean, and explore the heterogeneous compositionof the marine ichthyofauna found between 33° and 56° from a paleobiologicalperspective. During the early Cretaceous (140 Mya), the South Atlantic was still notformed, and Gondwana was probably a set of united plates with shallow continentalwaters. In the middle Cretaceous (112 Mya), the major Gondwanan plates starteddiverging from each other, allowing shallow marine intrusions and the diversificationof an endemic fish fauna. By the end of the Mesozoic (66 Mya), the proto-SouthAtlantic connected with the North Atlantic, which was still part of the Tethys Sea,allowing its ichthyofauna to colonize the south and reach the Antarctic region. Theopening of the Drake Passage in the Oligocene (33 Mya) enabled the cold waters ofthe Pacific Ocean to reach the South Atlantic, causing drastic effects on the thermophilicfauna and favoring the dispersion of cold-waterspecies. Successive glaciationsduring the Quaternary (2 Myr to 10,000 years ago) resulted in the prevalence ofAntarctic climatic conditions in the southern Southwest Atlantic. The long history ofchanging scenarios in the constitution of the southern Southwest Atlantic is reflectedin the heterogeneous composition of the marine ichthyofauna between 33° and 56°S,which is characterized by a mixture of cosmopolitan, Tethyan, Pacific, Gondwanan,Antarctic, and endemic origins.

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《Marine ecology》 |2023年第2期|e12742.1-e12742.8|共8页
作者
Daniel E. Figueroa; Santiago A. Barbini; Mauro BelleggiaDavid E. SabadinJorge M. RománAgustín M. De Wysiecki;
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作者单位

Laboratorio de Biología de Peces,Instituto de Investigaciones Marinas yCosteras (IIMyC), Universidad Nacionalde Mar del Plata (UNMdP), Mar del Plata,Argentina;

Laboratorio de Biología de Peces,Instituto de Investigaciones Marinas yCosteras (IIMyC), Universidad Nacionalde Mar del Plata (UNMdP), Mar del Plata,Argentina,Consejo Nacional de InvestigacionesCientíficas y Técnicas (CONICET), BuenosAires, Argentina;

Consejo Nacional de InvestigacionesCientíficas y Técnicas (CONICET), BuenosAires, Argentina;

Instituto Nacional de Investigación yDesarrollo Pesquero (INIDEP), Mar delPlata, ArgentinaLaboratorio de Biología de Peces,Instituto de Investigaciones Marinas yCosteras (IIMyC), Universidad Nacionalde Mar del Plata (UNMdP), Mar del Plata,Argentina;

Comisión de Investigaciones Científicasde la Provincia de Buenos Aires (CIC), LaPlata, ArgentinaConsejo Nacional de InvestigacionesCientíficas y Técnicas (CONICET), BuenosAires, Argentina;

Laboratorio de Ecología de Peces, Centropara el Estudio de Sistemas Marinos(CESIMAR), Puerto Madryn, Argentina;

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正文语种英语
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Drake Passage; endemism; evolutionary history; ichthyofauna; phylogeography; WeddellianProvince;

The ichthyofaunistic colonization and complex biogeographic history of the southern portion of the Southwest Atlantic Ocean

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