Aquifer and surface-water ostracodes in Quaternary paleowetland deposits of southern Nevada, USA

Forester, Richard M.; Carter, Claire; Quade, Jay; Smith, Alison J.

doi:10.1007/s10750-016-2966-5

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…By contrast with Pigati et al (2014), Springer et al (2015), and Forester et al (2016), who associated hypogean ostracodes with groundwater discharge, we did not find them in sediments deposited in samples from Strata I and III, even though we sieved our sediments using a 63 μm (230 US Standard) sieve to separate the sand fraction from the finer sediments. Based on the faunal association identified in ORBDL, it is likely that seasonal flooding introduced detrital sediments to the area during the rainy season(s).…”

Section: Discussioncontrasting

confidence: 74%

A Paleo-Lake and wetland paleoecology associated with human use of the distal Old River Bed Delta at the Pleistocene-Holocene transition in the Bonneville Basin, Utah, USA

et al. 2021

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Mollusk and ostracode assemblages from the distal Old River Bed delta (ORBD) contribute to our understanding of the Lake Bonneville basin Pleistocene-Holocene transition (PHT) wetland and human presence on the ORBD (ca. 13,000–7500 cal yr BP). Located on U.S. Air Force-managed lands of the Great Salt Lake Desert (GSLD) in western Utah, USA, the area provided 30 samples from 12 localities. The biological assemblages and the potential water sources using 87Sr/86Sr analyses showed wetland expansion and contraction across the PHT, including the Younger-Dryas Chronozone (YDC). The record reflects cold, freshwater conditions, which is uncharacteristic of the Great Salt Lake Desert, after recession of Lake Bonneville. Lymnaea stagnalis jugularis, Cytherissa lacustris, and possibly Candona sp. cf. C. adunca, an endemic and extinct species only reported from Lake Bonneville, suggest cold-water environments. Between 13,000–12,400 cal yr BP, a shallow lake formed, referred to as the Old River Bed delta lake, fed by Lake Gunnison, as shown by 87Sr/86Sr ratios of 0.71024–0.71063 in mollusk fossils collected at the ORBD, characteristic of the Sevier basin. These findings add paleoenvironmental context to the long-term use of the ORBD by humans in constantly changing wetland habitats between 13,000–9500 cal yr BP.

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Section: Discussioncontrasting

confidence: 74%

A Paleo-Lake and wetland paleoecology associated with human use of the distal Old River Bed Delta at the Pleistocene-Holocene transition in the Bonneville Basin, Utah, USA

et al. 2021

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“…Salt-tolerant (euryhaline) ostracods, which characterize some lakes, are uncommon in GWDs, but may be present where spring discharge reaches and evaporates in a terminal basin. One unusual feature of ostracod faunas in GWDs is the local abundance of minute subterranean taxa that live in intergranular spaces and fractures of the saturated zone (Reeves et al, 2007; Forester et al, 2016). Fish are also found in GWDs, as are turtles, and in the Old World, crocodile and hippopotamus.…”

Section: Lakes Megalakes and Wetlandsmentioning

confidence: 99%

Megalakes in the Sahara? A Review

et al. 2018

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The Sahara was wetter and greener during multiple interglacial periods of the Quaternary, when some have suggested it featured very large (mega) lakes, ranging in surface area from 30,000 to 350,000 km2. In this paper, we review the physical and biological evidence for these large lakes, especially during the African Humid Period (AHP) 11–5 ka. Megalake systems from around the world provide a checklist of diagnostic features, such as multiple well-defined shoreline benches, wave-rounded beach gravels where coarse material is present, landscape smoothing by lacustrine sediment, large-scale deltaic deposits, and in places, tufas encrusting shorelines. Our survey reveals no clear evidence of these features in the Sahara, except in the Chad basin. Hydrologic modeling of the proposed megalakes requires mean annual rainfall ≥1.2 m/yr and a northward displacement of tropical rainfall belts by ≥1000 km. Such a profound displacement is not supported by other paleo-climate proxies and comprehensive climate models, challenging the existence of megalakes in the Sahara. Rather than megalakes, isolated wetlands and small lakes are more consistent with the Sahelo-Sudanian paleoenvironment that prevailed in the Sahara during the AHP. A pale-green and discontinuously wet Sahara is the likelier context for human migrations out of Africa during the late Quaternary.

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“…Several other reports on occurrences of C. okeechobei(e.g., taylor & howarD 1993; KauFMann et al 2002;Fleury et al 2014;Forester et al 2017) do not provide illustrations or descriptions of what they call C. okeechobei, so if they based their work on any of the above three papers, then these (and other) identifications are uncertain. Our conclusion at this stage is that several populations have erroneously been identified as C. okeechobei and to go any further into the specific status of these populations is beyond the scope of the present paper.Cypridopsis howei Ferguson, 1964 from Louisiana (USA) has a highly similar Hp morphology, also with the hyperdeveloped thumb-like expansion on the ls.Sadly, FerGuson (1964) did not illustrate or describe the prehensile palps.…”

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confidence: 99%

The common morphospecies Cypridopsis vidua (O.F. MÜLLER, 1776) (Crustacea, Ostracoda) is not an obligate parthenogen

et al. 2023

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The common non-marine ostracod Cypridopsis vidua (O.F. Müller, 1776) is used as a proxy in various biological disciplines, such as (palaeo-)ecology, evolutionary biology, ecotoxicology and parasitology. This morphospecies was considered to be an obligate parthenogen. We report on the discovery of the first population of C. vidua with males from Woods Hole (MA, USA) and determine that it is a population with mixed reproduction. We describe the morphology of the males and of the sexual and asexual females. We illustrate a copula of a male and a sexual female as well insemination in a sexual female, showing that males are functional. Therefore, Cypridopsis vidua is a morphospecies with mixed reproduction, not a full apomictic parthenogen. We use, for the first time, polychromatic polarization microscope technology to illustrate soft parts of ostracods. In addition, we compare the sexual species C. bisexualis, C. okeechobei, C. howei and C. schwartzi and conclude that these species, especially the latter three, are morphologically very close to C. vidua.

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Aquifer and surface-water ostracodes in Quaternary paleowetland deposits of southern Nevada, USA

Cited by 5 publications

References 35 publications

A Paleo-Lake and wetland paleoecology associated with human use of the distal Old River Bed Delta at the Pleistocene-Holocene transition in the Bonneville Basin, Utah, USA

A Paleo-Lake and wetland paleoecology associated with human use of the distal Old River Bed Delta at the Pleistocene-Holocene transition in the Bonneville Basin, Utah, USA

Megalakes in the Sahara? A Review

The common morphospecies Cypridopsis vidua (O.F. MÜLLER, 1776) (Crustacea, Ostracoda) is not an obligate parthenogen

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