Antarctica as an evolutionary arena during the Cenozoic global cooling

Condamine, Fabien L.; Kergoat, Gaël J.

doi:10.1073/pnas.2108886118

Cited by 6 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Increased upwelling generated by seamount-bottom nutrient-rich current interactions, would have increased the supply of nutrients to the top of seamounts, thereby enhancing primary productivity in the vicinity of seamounts 48,49 . Similar enhancements in circulation occurred at 72-71 Ma, 25-23 Ma, 11-10 Ma and 8-7 Ma, due to changes in the extent of ice sheets [50][51][52][53][54] . Furthermore, during such cooling events, enhanced physical weathering and transport of Central Asian dust commonly increased the supply of micro-nutrients to the Pacific, thereby elevating surface ocean productivity 55,56 .…”

Section: Drivers Of Phosphatization Eventsmentioning

confidence: 53%

WITHDRAWN: Episodic intensification of marine phosphorus burial over the last 80 million years

Li,

Peng,

Poulton

et al. 2023

Preprint

View full text Add to dashboard Cite

Marine phosphatization events cause episodic carbonate fluorapatite (CFA) precipitation on seamounts, and are commonly linked to growth hiatuses in ferromanganese (Fe-Mn) crusts. However, the full record of these events and their paleoenvironmental implications remain poorly understood, in large part due to poor age constraints. Here, we apply U-Pb dating to CFA in Fe-Mn crusts from the Western Pacific seamounts, representing the Earth’s oldest oceanic crust. These data reveal six distinct phosphatization events, which are aligned with Sr isotope records in CFA and phosphorite from both the Western Pacific and the Atlantic. This newly established CFA chronology tightens the timespan of phosphatization events and refines the age framework of Fe-Mn crusts. We subsequently utilize a multiproxy approach to demonstrate that the phosphatization events occurred coeval with the expansion of oceanic oxygen minimum zones. The Western Pacific Fe-Mn crusts thus document major perturbations in global oceanic phosphorus cycling, which appear to have been driven by climate-induced increases in primary productivity.

show abstract

Section: Drivers Of Phosphatization Eventsmentioning

confidence: 53%

WITHDRAWN: Episodic intensification of marine phosphorus burial over the last 80 million years

Li,

Peng,

Poulton

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…With more than 62,000 known species, weevils (Coleoptera: Curculionoidea) are the most diversified phytophagous insect superfamily (Oberprieler et al, 2007). Thanks to their worldwide distribution and very diverse morphology and biology, weevils are often used as models to investigate diversification patterns in relation to biotic and abiotic drivers (e.g., Baird et al, 2021;Condamine & Kergoat, 2021;Haran et al, 2021;Letsch et al, 2018;Toussaint et al, 2014). South Africa, and the CFR in particular, presents a high level of endemicity for weevil lineages, both at the generic and tribal level (Alonso-Zarazaga & Lyal, 1999;Meregalli et al, 2021;Oberprieler, 2014).…”

Section: Introductionmentioning

confidence: 99%

Late Cenozoic environmental changes drove the diversification of a weevil genus endemic to the Cape Floristic Region

et al. 2022

Self Cite

View full text Add to dashboard Cite

The Cape Floristic Region in the Republic of South Africa is a well-recognized hotspot of biodiversity. Although this region is mostly known for its high level of plant diversity and endemicity, it also hosts an understudied and likely diverse arthropod fauna. Here we investigate the evolutionary history and timing of diversification of the apterous weevil genus Phlyctinus (Curculionidae: Entiminae), which is endemic to the coastal area and adjacent mountain ranges of the Cape floristic region and generally associated with sunflower plants (Asteraceae). We use a diverse array of molecular analyses (phylogenetic inference, molecular species delimitation and dating analyses) to analyse a novel molecular dataset of 202 weevil specimens (including 170 Phlyctinus sampled in 60 sites), and sequenced for two mitochondrial and four nuclear gene fragments. Phylogenetic and dating analyses indicate that the genus started diversifying in the late Miocene, with contrasting diversification dynamics for the three inferred clades, which present disjunct distributions. Host plant records and the lack of relatedness of species living in sympatry indicate that the diversification of Phlyctinus was predominantly driven by allopatric (geographic) speciation. We hypothesize that the interplay between topography and recurring cycles of coastline-habitat fragmentation resulting from sea level oscillations spurred the diversification of the most speciose clade, whereas in the two remaining clades populations likely remained connected thus hampering allopatric speciation. Interestingly, this pattern echoes with the role of sea level oscillations as an important driver of the radiation of several lineages in the coastline ecosystems of the Cape Floristic Region.

show abstract

“…It is indisputable that Antarctica was present between other austral landmasses and that it was biologically suitable for the survival of the elmids until the middle Miocene (e.g. Condamine & Kergoat, 2021; Denton & Sugden, 2005). We argue that instead of testing whether Antarctica played a role in Gondwanan biogeographic history, constrained models may be useful to explore how Antarctica was involved.…”

Section: Discussionmentioning

confidence: 99%

Reconstructing ancient dispersal through Antarctica: A case study of stream‐inhabiting beetles

Sýkora,

Herrera‐Alsina,

Maier

et al. 2023

Journal of Biogeography

View full text Add to dashboard Cite

AimAlthough Antarctica hosted a diverse fauna and flora in the past, its modern climate is too extreme for many lineages: their recent extinction makes it difficult to include the continent in historical biogeographical analyses. We use southern temperate stream‐inhabiting beetles as a model to explore whether Antarctica may be included in historical biogeographic reconstructions in a group absent from Antarctica today, and to test its role in shaping the current distribution of stream‐inhabiting insects.TaxonColeoptera, Elmidae.LocationSouthern Hemisphere temperate regions and Antarctica.MethodsWe included Antarctica in historical biogeographic analyses indirectly, as a component of distance matrices specifying the relative positions of continents, or by specifying Antarctica as a stepping‐stone between remaining continents (in LEMAD). We used a newly constructed dated phylogeny of Elmidae to test the performance of these constrained analyses under different parameter settings and geographical scenarios.ResultsAntarctica can be implemented into historical biogeographic analyses via indirect constraints to produce biologically relevant reconstructions when long‐distance dispersal events are highly penalized, the maximum number of areas per species is low, and expected extinction rates are high (in LEMAD). Unconstrained models, including those without Antarctica, result in simpler scenarios with fewer biogeographic events and better fit to data. The origin of austral clades of Elmidae post‐date the separation of Gondwanan landmasses.Main ConclusionsAntarctica can be included in historical biogeographic reconstructions under a priori assumptions that (1) it was part of the ancient biogeography of the clade, (2) the taxon has limited dispersal ability, making long‐distance dispersal highly unlikely and (3) maximum range size is limited. These assumptions may be biologically justified for many animal groups. Over‐water dispersal has been crucial in shaping the modern distribution of austral stream‐inhabiting beetles, likely facilitated by ocean currents and dispersal through Antarctica until the Oligocene.

show abstract

Antarctica as an evolutionary arena during the Cenozoic global cooling

Cited by 6 publications

References 20 publications

WITHDRAWN: Episodic intensification of marine phosphorus burial over the last 80 million years

WITHDRAWN: Episodic intensification of marine phosphorus burial over the last 80 million years

Late Cenozoic environmental changes drove the diversification of a weevil genus endemic to the Cape Floristic Region

Reconstructing ancient dispersal through Antarctica: A case study of stream‐inhabiting beetles

Contact Info

Product

Resources

About