Using species-specific paleotemperature equations with foraminifera: a case study in the Southern California Bight

Bemis, Bryan E.; Spero, Howard J.; Thunell, Robert C.

doi:10.1016/s0377-8398(02)00083-x

Cited by 64 publications

(68 citation statements)

References 57 publications

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“…However, proxy signals preserved in foraminiferal shells have been shown to vary significantly between species (Erez, 1978;Hemleben et al, 1989;Spero, 1998;Spero et al, 2003), with species identifications being strongly reliant on morphological concepts (Tendal, 1990). As a result of these interspecies differences, which are generally attributed to vital effects or ecological factors such as depth habitat and/or seasonal preferences, species-specific proxy calibrations are necessary in order to produce the most reliable estimates of past ocean conditions (Hemleben et al, 1989;Spero et al, 1997;Bijma et al, 1998;Bemis et al, 2002). Despite attempts to differentiate between morphologically defined species, the paleoceanographic community has long recognized the existence of morphotypes within species of planktonic foraminifera, often finding a large range in morphologies within a single population (Kennett, 1976;Deuser et al, 1981;Bé et al, 1983;Deuser, 1987;Deuser and Ross, 1989).…”

Section: Overviewmentioning

confidence: 99%

Morphometric and stable isotopic differentiation of Orbulina universa morphotypes from the Cariaco Basin, Venezuela

Marshall

Thunell

Spero

et al. 2015

Marine Micropaleontology

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Biometric characteristics of Orbulina universa (d'Orbigny) were used to differentiate two morphotypes present in sediment trap samples collected from the Cariaco Basin, Venezuela. Specifically, wall thickness and weight-area relationships were used to separate shells into thin (M thin ) and thick (M thick ) morphotypes. M thick (mean thickness = 19-41 μm) comprises 75% of the total O. universa in these samples and has morphometric characteristics similar to that of the previously described Type I Caribbean genotype, whereas M thin (mean thickness = 6-22 μm) is comparable to the Type III Mediterranean genotype. The flux of M thick increases during periods of upwelling, whereas M thin flux shows no systematic relationship with changing hydrographic regimes in the basin. The δ 18O and δ 13 C of M thick are on average 0.34‰ higher and 0.38‰ lower, respectively, than those of M thin , suggesting that they calcify their final spherical chamber at different depths in the water column and/or differ in their vital effects on shell geochemistry. Additionally, the absolute offset in the stable isotopic compositions of the two morphotypes varies as a function of surface ocean stratification. During periods of upwelling, the δ

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Section: Overviewmentioning

confidence: 99%

Morphometric and stable isotopic differentiation of Orbulina universa morphotypes from the Cariaco Basin, Venezuela

Marshall

Thunell

Spero

et al. 2015

Marine Micropaleontology

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“…Based on the studies in the northern Indian Ocean and other world oceans, it has been reported that the stable isotopic composition of G. bulloides reflects the physico-chemical conditions (such as temperature, salinity, eutrophication, depth setting, seasonality, etc.) of the seawater in which it calcifies its test (Naidu & Niitsuma, 2004;Gao et al, 1985;Bemis et al, 2002). Here, we have considered the effect of temperature on δ 18 O of G.…”

Section: Resultsmentioning

confidence: 99%

“…After the pioneering work of Emiliani (1955), continuous efforts have been made to refine the paleotemperature equations (Bemis et al, 1998(Bemis et al, , 2002. It is based on the calibration from plankton/core top foraminiferal oxygen isotopic ratio and seawater temperature, gathered from different parts of the world oceans including the Indian Ocean (Duplessy et al, 1981;Mulitza et al, 2003) Graham et al (1981) studied the relationship between stable isotopic composition of benthic foraminifera and seawater temperature using core top sediments from deep sea throughout the world oceans including southwestern Indian Ocean.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen isotope records of Globigerina bulloides across a north-south transect in the south-western Indian Ocean

2009

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Oxygen isotopic analysis of planktic foraminifera (Globigerina bulloides) from a total of 23 surface sediment samples collected along a north-south transect (9.69°N to 55.01°S) in the southwestern Indian Ocean during the Indian Pilot Expedition to Southern Ocean (PESO), was carried out to assess the relationship between oxygen isotopic composition and ambient seawater temperature and salinity. An increasing trend in the δ 18 O value is noticed towards higher latitude.Apparently such an increase in δ 18 O values is inversely related to the seawater temperature changes along the transect. However, slight mismatch is observed at a few stations, which is attributed to significant seawater salinity changes. The preliminary results of the present study, if extended to the subsurface sediments coupled with other parameters, may contribute to the reconstruction of the paleohydrography of the region, especially the position of various seawater fronts during the geologic past, albeit with areal limitation.

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“…Thus, like some of the fish, waterfowl, and possibly pond turtles, mussels must have been collected in these environments and hauled back to CA-SOL-364. 18 O of biogenic carbonates, such as calcite and aragonite, deposited by shellfish organisms depends strongly on water temperature and which varies directly with salinity (Bemis et al 2002;Kim and O'Neil 1997). Along the open Pacific Coast of California, salinity is relatively constant and it is water temperature that mainly affects changes in d…”

Section: Ca-sol-364mentioning

confidence: 99%

Staple, Feasting, or Fallback Food? Mussel Harvesting Among Hunter-Gatherers in Interior Central California

Eerkens

Schwitalla²,

Spero

et al. 2016

Journal of Ethnobiology

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Shells are a visible component of archaeological middens in Central California. While coastal and bay shore sites are often dominated by shells, these food items were sometimes hauled many kilometers from their collection points and are found in appreciable numbers in inland sites as well. Using oxygen and carbon stable isotope data from 44 Mytilus sp. (mussel) shells, we reconstruct shellfish seasonality harvesting at one inland site dating to the Middle Period (ca. 2500-1000 cal yrs BP), CA-SOL-364. Data show that shells were collected from nearby Suisun Marsh and were harvested almost exclusively during winter, a pattern that contrasts with coastal and bay shore sites. Such a harvesting signature is unlike that expected for a food staple or a feasting resource. We suggest mussels were harvested as a fallback food, as a source of protein or micronutrient to complement carbohydrate-rich foods that were stored and consumed during winter, or perhaps were only exploited as opportunity costs relaxed during winter, making sessile mussels an attractive subsistence pursuit.

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Using species-specific paleotemperature equations with foraminifera: a case study in the Southern California Bight

Cited by 64 publications

References 57 publications

Morphometric and stable isotopic differentiation of Orbulina universa morphotypes from the Cariaco Basin, Venezuela

Morphometric and stable isotopic differentiation of Orbulina universa morphotypes from the Cariaco Basin, Venezuela

Oxygen isotope records of Globigerina bulloides across a north-south transect in the south-western Indian Ocean

Staple, Feasting, or Fallback Food? Mussel Harvesting Among Hunter-Gatherers in Interior Central California

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