Steps in the intensification of Benguela upwelling over the Walvis Ridge during Miocene and Pliocene

Hoetzel, Sebastian; Dupont, Lydie M; Marret, Fabienne; Jung, Gerlinde; Wefer, Gerold

doi:10.1007/s00531-016-1309-0

Cited by 10 publications

(6 citation statements)

References 83 publications

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“…Furthermore, during the Late Miocene a cold and nutrient‐rich current between the Indian and Atlantic Oceans, the Benguela upwelling system, was formed (Heinrich et al, 2011; Rommerskirchen et al, 2011). This played a major role in regulating climate during this period (Etourneau et al, 2012), including a cooling intensification (Hoetzel et al, 2017) culminating in drops in the sea surface temperature (Hoetzel et al, 2013) that may have created a barrier to S. zygaena . Besides the amount of oceanographic and geological data, marine biological data also support a Late Miocene break in gene flow following the closure of the Central American Seaway (Bacon et al, 2015; Lessios, 2015).…”

Section: Discussionmentioning

confidence: 99%

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Global phylogeography of the smooth hammerhead shark: Glacial refugia and historical migration patterns

Ferrette

Coelho

Peddemors

et al. 2021

Aquatic Conservation

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1. Extreme climate changes during the Cenozoic Era strengthened different biogeographical barriers that decreased the connectivity among populations, triggering lineage diversification of different species worldwide. 2. The mitochondrial DNA control region was employed to explore the phylogeography of Sphyrna zygaena, a globally distributed species threatened by unsustainable, illegal, unreported and unregulated fisheries triggered by the international shark fin trade. It is listed as 'Vulnerable' by the IUCN Red List and its trade is regulated by CITES Appendix II. 3. Only 13 haplotypes were found with low genetic diversity levels (hd = 0.686 ± 0.014; π = 0.00206 ± 0.00004) compared with other species of the Sphyrnidae family. The species has a very strong phylogeographic population structure among the Atlantic, Indian and Pacific Oceans (Φ ST = 0.79132).Worldwide, there are six distinct populations with some haplotype sharing.4. These populations are probably connected by a stepping-stone dispersal of a small number of migrants per generation from the Indo-Pacific towards the Atlantic. Modelling suggests that S. zygaena diverged into two lineages around 6.96 million years ago which have been isolated in glacial refuges in the Atlantic and Indo-Pacific oceans; and after deglaciation, a population expansion probably permitted secondary contact. 5. Conservation plans to establish differentiated management units should be adopted in each of the identified populations. Among these, the Eastern Central Atlantic and West Indo-Pacific are the most important areas for the species considering the historical migration routes that act as a bridge connecting the Atlantic and Indo-Pacific Oceans while the Gulf of Guinea connects the Atlantic populations. Still, further studies are required to know if these populations are also linked with nursery areas for the species.6. The results herein can help to delimit the main evolutionarily significant units to implement effective policies to establish differentiated management units as starting points to genetic monitoring programmes for Sphyrna zygaena.

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Section: Discussionmentioning

confidence: 99%

“…This played a major role in regulating climate during this period (Etourneau et al, 2012), including a cooling intensification (Hoetzel et al, 2017) culminating in drops in the sea surface temperature (Hoetzel et al, 2013) that may have created a barrier to S. zygaena.…”

Section: Phylogeographymentioning

confidence: 99%

Global phylogeography of the smooth hammerhead shark: Glacial refugia and historical migration patterns

Ferrette

Coelho

Peddemors

et al. 2021

Aquatic Conservation

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“…Sediments on the shelf, varying from quartz sands to organic-rich diatomaceous mud, contain patchy phosphorite deposits ranging from Miocene to Recent in age (Baturin, 2000;Compton and Bergh, 2016). The first appearance of sedimentary apatite enrichments on the Namibian Shelf coincides with the initiation of the BUS, following the Late Miocene global cooling phase (Hoetzel et al, 2017). Apatite containing sediments on the shelf can be broadly divided into two distinct groups: reworked phosphorites and phosphatic sediments on the middle and outer shelf and in-situ phosphatic sediments on the inner shelf (Baturin, 2000;Compton and Bergh, 2016).…”

Section: Geological Settingmentioning

confidence: 99%

“…A distinct feature of upwelling zones, especially in the case of the margins of organic-rich muds, is spatially heterogeneous redox conditions or "poikiloxia" (Algeo and Rowe, 2012). Redox conditions at the SWI on the shelf are variable both on long (>100 yr; Algeo and Li, 2020;Hoetzel et al, 2017) and short timescales (monthly/daily; Bailey and Chapman, 1991;Brüchert et al, 2003Brüchert et al, , 2006. These short fluctuations in redox conditions at the SWI can facilitate bacterial P-pumping (sensu Brock and Schulz-Vogt, 2011).…”

Section: Implications For Phosphogenesismentioning

confidence: 99%

Constraining the conditions of phosphogenesis: Stable isotope and trace element systematics of Recent Namibian phosphatic sediments

Lumiste

Mänd

Bailey

et al. 2021

Geochimica et Cosmochimica Acta

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“…The palaeoclimatic history of the late Neogene-Pleistocene in Africa needs to be studied in more detail. This period has been linked to savanna establishment in Africa, commencement of glaciation in high-latitude areas (Northern Hemisphere Glaciation) and, more importantly, the evolution of the genus Homo (DeMenocal 1995, Sowunmi 1986, Leroy & Dupont 1997, Valle et al 2014, Hoetzel et al 2017, Herbert et al 2016. Leroy and Dupont (1997) have given a good account of the stages involved in palaeoclimatic changes from 3.7 to 1.7 Ma from 658 ODP site sediments from offshore northwestern Africa.…”

mentioning

confidence: 99%

Palaeoclimatology and biostratigraphic significance of late Neogene/Quaternary vegetational changes recorded in the offshore western Niger Delta

Adeonipekun

Sowunmi

2019

Acta Palaeobotanica

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Attempts at reconstructing palaeoclimatic changes over time using palynomorphs of three oil wells drilled in the shallow offshore Niger Delta led to cluster analysis-aided recognition of seven pollen zones. These pollen zones are equivalent to ten palaeoclimatic zones with alternating dry and wet conditions. The palynomorphs were classified into phytoecological groups and changes in their relative abundances were employed to interpret the palaeoclimatic conditions of their source areas. Contrasting fluctuations in the proportions of the Spore (Pteridophytes) phytoecological group and those of the Poaceae were the main basis for palaeoclimatic inferences. Trends of the occurrence of other phytoecological groups were used to substantiate our palaeoclimatic inferences. In the latest Miocene (5.8–5.5 Ma), climatic conditions were mainly wet until between 5.5 and 5.0 Ma, when extreme dry conditions prevailed. The early Pliocene part (5.0–>3.4 Ma) was generally wet, while the late Pliocene part (<3.0–2.7 Ma) was extremely dry, with wet conditions re-occurring at the latest Pliocene/earliest Pleistocene boundary at a lower magnitude than those of the early Pliocene. This is inferred from the bloom of open vegetation Acanthaceae undif., Polygala sp. and Asystacia gangetica, along with montane Podocarpus milanjianus from 2.4 Ma through 2.0 Ma and younger. The Acanthaceae bloom recorded the evolution of A. gangetica in the latest Pliocene/earliest Pleistocene at around 2.0 Ma in the Niger Delta. The upper Early Pliocene regional wet event is associated with distinct peaks of riverine forest, freshwater swamp and mangrove pollen. Our results further support earlier findings from other parts of West Africa with respect to palaeoclimatic changes in the late Neogene/earliest Quaternary. Equivalent qualitative palynostratigraphic events were recognized within the pollen zones which are useful for age determination, and the significance of biostratigraphic correlation of the zones is stressed.

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Steps in the intensification of Benguela upwelling over the Walvis Ridge during Miocene and Pliocene

Cited by 10 publications

References 83 publications

Global phylogeography of the smooth hammerhead shark: Glacial refugia and historical migration patterns

Global phylogeography of the smooth hammerhead shark: Glacial refugia and historical migration patterns

Constraining the conditions of phosphogenesis: Stable isotope and trace element systematics of Recent Namibian phosphatic sediments

Palaeoclimatology and biostratigraphic significance of late Neogene/Quaternary vegetational changes recorded in the offshore western Niger Delta

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