Eastern equatorial Pacific benthic foraminiferal distribution and deep water temperature changes during the early to middle Miocene

Kochhann, Karlos Guilherme Diemer; Holbourn, Ann; Kuhnt, Wolfgang; Xu, Jian

doi:10.1016/j.marmicro.2017.05.002

Cited by 12 publications

(15 citation statements)

References 58 publications

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“…The swift radiation of Bristly Kiwaidae coincides with another large global shift in oceanographic conditions during the middle Miocene ~12–16 Ma, known as the middle Miocene Climate Transition (MMCT) [ 94 ]. This episode was characterised by a substantial cooling and increased ventilation of the world’s deep-water masses and a rearrangement of global ocean currents [ 95 ] following a 2 My warm episode that had resulted in a ~600 m shoaling of the carbonate compensation depth in the tropical East Pacific [ 83 , 96 ]. If the tree topology presented here is taken at face value, the most probable location for the primary split within the group is near the Equator in the East Pacific (Figs 2 and 7 ), with a subsequent southward migration for the K .…”

Section: Discussionmentioning

confidence: 99%

A new yeti crab phylogeny: Vent origins with indications of regional extinction in the East Pacific

et al. 2018

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The recent discovery of two new species of kiwaid squat lobsters on hydrothermal vents in the Pacific Ocean and in the Pacific sector of the Southern Ocean has prompted a re-analysis of Kiwaid biogeographical history. Using a larger alignment with more fossil calibrated nodes than previously, we consider the precise relationship between Kiwaidae, Chirostylidae and Eumunididae within Chirostyloidea (Decapoda: Anomura) to be still unresolved at present. Additionally, the placement of both new species within a new “Bristly” clade along with the seep-associated Kiwa puravida is most parsimoniously interpreted as supporting a vent origin for the family, rather than a seep-to-vent progression. Fossil-calibrated divergence analysis indicates an origin for the clade around the Eocene-Oligocene boundary in the eastern Pacific ~33–38 Ma, coincident with a lowering of bottom temperatures and increased ventilation in the Pacific deep sea. Likewise, the mid-Miocene (~10–16 Ma) rapid radiation of the new Bristly clade also coincides with a similar cooling event in the tropical East Pacific. The distribution, diversity, tree topology and divergence timing of Kiwaidae in the East Pacific is most consistent with a pattern of extinctions, recolonisations and radiations along fast-spreading ridges in this region and may have been punctuated by large-scale fluctuations in deep-water ventilation and temperature during the Cenozoic; further affecting the viability of Kiwaidae populations along portions of mid-ocean ridge.

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Section: Discussionmentioning

confidence: 99%

A new yeti crab phylogeny: Vent origins with indications of regional extinction in the East Pacific

et al. 2018

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“…In the tropical Indian Ocean, high-productivity taxa peak between 10 and 8 Ma (Smart et al, 2007). The deep equatorial Pacific features similar increases in abundance of benthic foraminifera characteristic of high-organic carbon delivery beginning at 13.8 Ma and coincident with increased accumulation rates of benthic foraminifera and opal (Kochhann et al, 2017). In more oligotrophic regions of the Pacific Ocean (ODP Sites 1146 and 1237) and the eastern Indian Ocean (ODP Site 761), suspension feeders (Cibicidoides spp.)…”

Section: Deep-sea Foraminiferamentioning

confidence: 96%

“…Ma and coincident with increased accumulation rates of benthic foraminifera and opal (Kochhann et al, 2017). In more oligotrophic regions of the Pacific Ocean (ODP Sites 1146 and 1237) and the eastern Indian Ocean (ODP Site 761), suspension feeders (Cibicidoides spp.)…”

Section: Accepted Articlementioning

confidence: 97%

“…Significant changes in deep sea foraminifera occurred in the middle Miocene around the time of the MMCT and in the late Miocene (Flower & Kennett, 1994;Holbourn et al, 2004;2013a;Kochhann et al, 2017;Miller & Katz, 1987;Smart et al, 2007) (Fig. 1).…”

Section: Deep Sea Foraminiferamentioning

confidence: 99%

“…Significant changes in deep sea foraminifera occurred in the middle Miocene around the time of the MMCT and in the late Miocene (Flower & Kennett, 1994; Holbourn et al., 2004, 2013a; Kochhann et al., 2017; Miller & Katz, 1987; Smart et al., 2007; Figure 1). Across a wide depth transect (1,200–3,500 m paleodepth) in the tropical Indian Ocean, the MMCT was characterized by an increase in epifaunal taxa at deeper sites and by increased high‐productivity taxa at shallower sites (Smart et al., 2007).…”

Section: Marine Biota and Ecosystemsmentioning

confidence: 99%

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The Miocene: The Future of the Past

Steinthorsdottir

Coxall

Boer

et al. 2021

Paleoceanog and Paleoclimatol

236

179

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The Miocene epoch (23.03-5.33 Ma) was a time interval of global warmth, relative to today.Continental configurations and mountain topography transitioned toward modern conditions, and many flora and fauna evolved into the same taxa that exist today. Miocene climate was dynamic: long periods of early and late glaciation bracketed a ∼2 Myr greenhouse interval-the Miocene Climatic Optimum (MCO). Floras, faunas, ice sheets, precipitation, pCO 2 , and ocean and atmospheric circulation mostly (but not ubiquitously) covaried with these large changes in climate. With higher temperatures and moderately higher pCO 2 (∼400-600 ppm), the MCO has been suggested as a particularly appropriate analog for future climate scenarios, and for assessing the predictive accuracy of numerical climate models-the same models that are used to simulate future climate. Yet, Miocene conditions have proved difficult to reconcile with models. This implies either missing positive feedbacks in the models, a lack of knowledge of past climate forcings, or the need for re-interpretation of proxies, which might mitigate the model-data discrepancy. Our understanding of Miocene climatic, biogeochemical, and oceanic changes on broad spatial and temporal scales is still developing. New records documenting the physical, chemical, and biotic aspects of the Earth system are emerging, and together provide a more comprehensive understanding of this important time interval. Here, we review the state-of-the-art in Miocene climate, ocean circulation, biogeochemical cycling, ice sheet dynamics, and biotic adaptation research as inferred through proxy observations and modeling studies. Plain Language Summary During the Miocene time period (∼23-5 million years ago),Planet Earth looked similar to today, with some important differences: the climate was generally warmer and highly variable, while atmospheric CO 2 was not much higher. Continental-sized ice sheets were only present on Antarctica, but not in the northern hemisphere. The continents drifted to near their modernday positions, and plants and animals evolved into the many (near) modern species. Scientists study the Miocene because present-day and projected future CO 2 levels are in the same range as those reconstructed for the Miocene. Therefore, if we can understand climate changes and their biotic responses from the Miocene past, we are able to better predict current and future global changes. By comparing Miocene climate reconstructions from fossil and chemical data to climate simulations produced by computer models, scientists are able to test their understanding of the Earth system under higher CO 2 and warmer conditions than those of today. This helps in constraining future warming scenarios for the coming STEINTHORSDOTTIR ET AL.

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A dynamic ocean driven by changes in CO2 and Antarctic ice-sheet in the middle Miocene

Frigola

Prange

Schulz

2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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Eastern equatorial Pacific benthic foraminiferal distribution and deep water temperature changes during the early to middle Miocene

Cited by 12 publications

References 58 publications

A new yeti crab phylogeny: Vent origins with indications of regional extinction in the East Pacific

A new yeti crab phylogeny: Vent origins with indications of regional extinction in the East Pacific

The Miocene: The Future of the Past

A dynamic ocean driven by changes in CO2 and Antarctic ice-sheet in the middle Miocene

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