Cenozoic climate change and diversification on the continental shelf and slope: evolution of gastropod diversity in the family Solariellidae (Trochoidea)
|Author(s)||Williams S. T.1, Smith L. M.1, Herbert D.G.2, 3, Marshall B. A.4, Waren A.5, Kiel S.6, Dyal P.1, Linse K.7, Vilvens C.8, Kano Y.9|
|Affiliation(s)||1 : Nat Hist Museum, Dept Life Sci, London SW7 5BD, England.
2 : KwaZulu Natal Museum, ZA-3200 Pietermaritzburg, South Africa.
3 : Univ KwaZulu Natal, Sch Life Sci, ZA-3206 Pietermaritzburg, South Africa.
4 : Museum New Zealand Te Papa Tongarewa, Wellington, New Zealand.
5 : Swedish Museum Nat Hist, SE-10405 Stockholm, Sweden.
6 : Univ Gottingen, Abt Geobiol, Geowissensch Zentrum, D-37077 Gottingen, Germany.
7 : British Antarctic Survey, Cambridge CB3 0ET, England.
8 : Museum Natl Hist Nat, F-75231 Paris 05, France.
9 : Univ Tokyo, Atmosphere & Ocean Res Inst, Dept Marine Ecosyst Dynam, Kashiwa, Chiba 2778564, Japan.
|Source||Ecology And Evolution (2045-7758) (Wiley-blackwell), 2013-04 , Vol. 3 , N. 4 , P. 887-917|
|WOS© Times Cited||25|
|Keyword(s)||Biogeography, deep sea, EoceneOligocene transition, phylogeny|
|Abstract||Recent expeditions have revealed high levels of biodiversity in the tropical deep-sea, yet little is known about the age or origin of this biodiversity, and large-scale molecular studies are still few in number. In this study, we had access to the largest number of solariellid gastropods ever collected for molecular studies, including many rare and unusual taxa. We used a Bayesian chronogram of these deep-sea gastropods (1) to test the hypothesis that deep-water communities arose onshore, (2) to determine whether Antarctica acted as a source of diversity for deep-water communities elsewhere and (3) to determine how factors like global climate change have affected evolution on the continental slope. We show that although fossil data suggest that solariellid gastropods likely arose in a shallow, tropical environment, interpretation of the molecular data is equivocal with respect to the origin of the group. On the other hand, the molecular data clearly show that Antarctic species sampled represent a recent invasion, rather than a relictual ancestral lineage. We also show that an abrupt period of global warming during the Palaeocene Eocene Thermal Maximum (PETM) leaves no molecular record of change in diversification rate in solariellids and that the group radiated before the PETM. Conversely, there is a substantial, although not significant increase in the rate of diversification of a major clade approximately 33.7 Mya, coinciding with a period of global cooling at the Eocene–Oligocene transition. Increased nutrients made available by contemporaneous changes to erosion, ocean circulation, tectonic events and upwelling may explain increased diversification, suggesting that food availability may have been a factor limiting exploitation of deep-sea habitats. Tectonic events that shaped diversification in reef-associated taxa and deep-water squat lobsters in central Indo-West Pacific were also probably important in the evolution of solariellids during the Oligo-Miocene.|