Before the ice: Biogeography of Antarctic Paleogene molluscan faunas

Beu, Alan G.

doi:10.1016/j.palaeo.2009.09.025

Cited by 60 publications

(90 citation statements)

References 140 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At the beginning of the period when sub-Antarctic Primnoidae are believed to have radiated in our 'Conservative' analysis (with the recognised limitations of just 3 calibration points; Sauquet et al, 2012) deep ocean temperatures would have been 8-12°C (Haupt and Seidov, 2001), much warmer than the 1-3°C found in the modern Antarctic ocean (Norris et al, 2013). There is evidence for a pre-ACC origin of a number of Antarctic marine invertebrates (Clarke and Crame, 2010): isopods and Ostracoda (Brandt, 1999), amphipods (Watling and Thurston, 1989), and molluscs (Beu, 2009). The relevance of refugia in times of glacial maxima to current population structures is keenly debated (Allcock and Strugnell, 2012;Convey et al, 2009;Thatje et al, 2005Thatje et al, , 2008.…”

Section: Evolutionary History Of Primnoidaementioning

confidence: 81%

Evolutionary dynamics of a common sub-Antarctic octocoral family

Taylor

Rogers

2015

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

Sequence data were obtained for five different loci, both mitochondrial (cox1, mtMutS, 16S) and nuclear (18S, 28S rDNA), from 64 species representing 25 genera of the common deep-sea octocoral family Primnoidae. We tested the hypothesis that Primnoidae have an Antarctic origin, as this is where they currently have high species richness, using Maximum likelihood and Bayesian inference methods of phylogenetic analysis. Using a time-calibrated molecular phylogeny we also investigated the time of species radiation in sub-Antarctic Primnoidae. Our relatively wide taxon sampling and phylogenetic analysis supported Primnoidae as a monophyletic family. The base of the well-supported phylogeny was Pacific in origin, indicating Primnoidae sub-Antarctic diversity is a secondary species radiation. There is also evidence for a subsequent range extension of sub-Antarctic lineages into deep-water areas of the Indian and Pacific Oceans. Conservative and speculative fossil-calibration analyses resulted in two differing estimations of sub-Antarctic species divergence times. Conservative analysis suggested a sub-Antarctic species radiation occurred ∼52MYA (95% HPD: 36-73MYA), potentially before the opening of the Drake Passage and Antarctic Circumpolar Current (ACC) formation (41-37MYA). Speculative analysis pushed this radiation back into the late Jurassic, 157MYA (95% HPD: 118-204MYA). Genus-level groupings were broadly supported in this analysis with some notable polyphyletic exceptions: Callogorgia, Fanellia, Primnoella, Plumarella, Thouarella. Molecular and morphological evidence supports the placement of Tauroprimnoa austasensis within Dasystenella and Fannyella kuekenthali within Metafannyella.

show abstract

Section: Evolutionary History Of Primnoidaementioning

confidence: 81%

Evolutionary dynamics of a common sub-Antarctic octocoral family

Taylor

Rogers

2015

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

show abstract

“…genus, but A. loisae does seem to be a species of Ellicea, suggesting the possibility that Ellicea was a Neogene migrant to New Zealand. The Seymour Island Eocene species referred to Aeneator by Stilwell & Zinsmeister (1990) seem more likely to belong in the Antarctic genus Prosipho Thiele, 1912(Beu 2009). Ellicea and Aeneator also possibly had an earlier, unrecorded history in New Zealand.…”

Section: Family Buccinulidaementioning

confidence: 99%

Marine Mollusca of isotope stages of the last 2 million years in New Zealand. Part 4. Gastropoda (Ptenoglossa, Neogastropoda, Heterobranchia)

Beu

2011

Journal of the Royal Society of New Zealand

View full text Add to dashboard Cite

“…This is particularly so in Antarctica, where intensive investigation of the prolific La Meseta Formation of Seymour Island, Antarctic Peninsula (c. 658 S palaeolatitude) has revealed that c. 32% of the Middle Eocene molluscan fauna (147 species) can be assigned to modern Antarctic and sub-Antarctic genera (Beu, 2009;Crame et al, 2014). This is particularly so in Antarctica, where intensive investigation of the prolific La Meseta Formation of Seymour Island, Antarctic Peninsula (c. 658 S palaeolatitude) has revealed that c. 32% of the Middle Eocene molluscan fauna (147 species) can be assigned to modern Antarctic and sub-Antarctic genera (Beu, 2009;Crame et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Differentiation of high‐latitude and polar marine faunas in a greenhouse world

Crame

McGowan

Bell

2018

Global Ecol Biogeogr

View full text Add to dashboard Cite

Aim The aim was to investigate those factors that influenced the differentiation of high‐latitude and polar marine faunas on both ecological and evolutionary time‐scales. Can a focus on a greenhouse world provide some important clues? Location World‐wide, but with particular emphasis on the evolution of Antarctic marine faunas. Time period Early Cenozoic era and present day. Major taxa studied Mollusca, especially Neogastropoda. Methods The Early Cenozoic global radiation of one of the largest extant marine clades, Neogastropoda, was examined, and detailed comparisons were made between two tropical localities and Antarctica. High‐ to low‐latitude faunal differentiation was assessed using Sørensen's dissimilarity index, and component species in each of the three faunas were assigned to 29 families and family groups. Relative diversity distributions were fitted to these three faunas and two modern ones to assess the contrast in evenness between high‐ and low‐latitude assemblages. Results By the Middle Eocene, a distinct high‐latitude neogastropod fauna had evolved in Antarctica. In addition, the distribution of species within families in this fauna is statistically significantly less even than that in the tropics. Indeed, there is no detectable difference in the scale of this separation from that seen today. Exactly as in the modern fauna, Middle Eocene Antarctic neogastropods are dominated by a small number of trophic generalist groups. Main conclusions As the hyperdiverse Neogastropoda clade radiated globally through the Early Cenozoic, it differentiated into distinct high‐ and low‐latitude components. The fact that it did so in a greenhouse world strongly suggests that something else besides temperature was involved in this process. The predominance of generalist feeding types in the Antarctic fossil faunas is linked to the phenomenon of a seasonally pulsed food supply, exactly as it is today. Seasonality in primary productivity may act as a fundamental control on the evolution of large‐scale biodiversity patterns.

show abstract

Before the ice: Biogeography of Antarctic Paleogene molluscan faunas

Cited by 60 publications

References 140 publications

Evolutionary dynamics of a common sub-Antarctic octocoral family

Evolutionary dynamics of a common sub-Antarctic octocoral family

Marine Mollusca of isotope stages of the last 2 million years in New Zealand. Part 4. Gastropoda (Ptenoglossa, Neogastropoda, Heterobranchia)

Differentiation of high‐latitude and polar marine faunas in a greenhouse world

Contact Info

Product

Resources

About