Spatio-temporal distribution of benthic foraminifera in relation to estuarine dynamics (Vie estuary, Vendée, W France)

Debenay, Jean-Pierre; Bicchi, Erica; Goubert, Évelyne; Châtelet, Éric

doi:10.1016/j.ecss.2005.11.014

Cited by 108 publications

(58 citation statements)

References 29 publications

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“…In contrast to spring 2006, benthic foraminifera are homogenously distributed up to 7-8 cm of the sediment. The spatial distribution of the two species used in this study is typical of East Atlantic temperate estuaries of the French and Spanish coast (e.g., Redois and Debenay, 1996;Debenay et al, 2000Debenay et al, , 2006Duchemin et al, 2005;Leorri and Cearreta, 2009). Ammonia tepida characterizes the upper and middle/upper parts of the estuary (Fig.…”

Section: Living Benthic Foraminiferal Faunasmentioning

confidence: 99%

Interpretation of benthic foraminiferal stable isotopes in subtidal estuarine environments

et al. 2009

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Abstract.Here we present a novel approach for the interpretation of stable isotope signatures recorded in benthic foraminifera from subtidal estuarine environments. The stable isotopic composition (δ 18 O and δ 13 C) of living Ammonia tepida and Haynesina germanica is examined at four stations in the Auray River estuary (Gulf of Morbihan, France) sampled in two contrasting seasons, spring 2006 and winter 2007. Comparing benthic foraminiferal δ 18 O measurements with theoretical oxygen isotopic equilibrium values, calculated on the basis of water temperature and salinity measurements in the upper and lower estuary, i.e., T-S-δ 18 O eq. diagrams, strongly suggests that foraminiferal faunas sampled at the four stations calcified during different periods of the year. This interpretation can be refined by using the benthic foraminiferal δ 13 C, which is mainly determined by the mixing of sea and river water. In the upper estuary foraminifera mainly calcified in early spring and winter, whereas in the lower estuary calcification mainly took place in spring, summer and autumn. This new method provides insight into the complexity of estuarine benthic foraminiferal stable isotope records. In addition, it can also be used to obtain new information on preferred calcification periods of benthic foraminiferal taxa in different parts of the estuary.

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Section: Living Benthic Foraminiferal Faunasmentioning

confidence: 99%

Interpretation of benthic foraminiferal stable isotopes in subtidal estuarine environments

et al. 2009

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“…In photic shallow-water habitats (e.g., estuaries, bays, lagoons and other intertidal or shallow-water subtidal areas), kleptoplastic benthic foraminiferal species, such as Haynesina germanica, Elphidium williamsoni, the "excavatum" species complex (e.g., E. oceanense, E. selseyense, see Darling et al (2016)), or Ammonia spp., are often the dominant mudflat foraminiferal taxa (Debenay et al, 2000;Debenay et al, 2006;Morvan et al, 2006;Bouchet et al, 2009;Pascal et al, 2009;Thibault de Chanvalon et al, 2015;Cesbron et al, 2016). Their vertical distribution is characterized by a clear maximum density in the upper oxygenated millimeters of the sediment (Alve and Murray, 2001;Bouchet et al, 2009;Thibault de Chanvalon et al, 2015;Cesbron et al, 2016), where light can also penetrate (Kuhl et al, 1994;Cartaxana et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructure and distribution of kleptoplasts in benthic foraminifera from shallow-water (photic) habitats

Jauffrais

Lekieffre

Koho

et al. 2018

Marine Micropaleontology

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Assimilation, sequestration and maintenance of foreign chloroplasts inside an organism is termed "chloroplast sequestration" or "kleptoplasty". This phenomenon is known in certain benthic foraminifera, in which such kleptoplasts can be found both intact and functional, but with different retention times depending on foraminiferal species. In the present study, seven species of benthic foraminifera (Haynesina germanica, Elphidium williamsoni, E. selseyense, E. oceanense, E. aff. E. crispum, Planoglabratella opercularis and Ammonia sp.) were collected from shallow-water benthic habitats and examined with transmission electron microscope (TEM) for cellular ultrastructure to ascertain attributes of kleptoplasts. Results indicate that all these foraminiferal taxa actively obtain kleptoplasts but organized them differently within their endoplasm. In some species, the kleptoplasts were evenly distributed throughout the endoplasm (e.g., H. germanica, E. oceanense, Ammonia sp.), whereas other species consistently had plastids distributed close to the external cell membrane (e.g., Elphidium williamsoni, E. selseyense, P. opercularis).Chloroplast degradation also seemed to differ between species, as many degraded plastids were found in Ammonia sp. and E. oceanense compared to other investigated species. Digestion ability, along with different feeding and sequestration strategies may explain the differences in retention time between taxa. Additionally, the organization of the sequestered plastids within the endoplasm may also suggest behavioral strategies to expose and/or protect the sequestered plastids to/from light and/or to favor gas and/or nutrient exchange with their surrounding habitats.

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“…Diversity values are typical of estuarine environments (as was described by, for instance, Debenay et al, 2006;Murray, 1991). One or two species comprise most of the living assemblages in most of the studied sites.…”

Section: Discussionmentioning

confidence: 99%

The response of benthic foraminifera to pollution and environmental stress in Ria de Aveiro (N Portugal)

Martins

Yamashita

Sousa

et al. 2011

Journal of Iberian Geology

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This work evaluates the quality of the sediment in Ria de Aveiro, a coastal lagoon located at N of Portugal that is under strong anthropic influence, and the effects of the contamination on benthic foraminifera. The initial approach for measuring pollution was done through the load pollution index (LPI), based on As, Cd, Cr, Cu, Ni, Pb and Zn concentrations, and determined by total digestion of the sediments (TDS). This information was complemented by conducting a metal fractionation technique (sequential chemical extraction -SCE) in some of the most contaminated samples in order to define the relevance of different metal bearingphases (exchangeable cations adsorbed by clay and co-precipitated with carbonates, absorbed by organic matter and retained in the mineralogical phase) and to evaluate the toxic heavy metal availability. Multivariable statistical analyses were carried out taking into consideration the geochemical results, as well as the biotic (percentage of species/groups of species; foraminifer abundance and diversity) and abiotic variables, such as sediment content in mud, total organic carbon (TOC) and Eh.SCE results show that most of the element concentration in the sediments is retained in the resistant mineralogical phase. However, the higher bioavailability of some toxic elements, such as As, Cd, Cu, Hg, Ni, Pb and Zn, found in Laranjo Bay, Aveiro City, Aveiro Harbours and Espinheiro Channel, have a generic negative impact on benthic foraminifera of the Aveiro lagoon. Differential sensitivity of benthic foraminifera to high concentrations of heavy metals may exist. Quinqueloculina seminulum, for instance, seems to be more tolerant to higher bioavailable concentrations of Pb and Cu than Ammonia tepida or Haynesina germanica. Both

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Spatio-temporal distribution of benthic foraminifera in relation to estuarine dynamics (Vie estuary, Vendée, W France)

Cited by 108 publications

References 29 publications

Interpretation of benthic foraminiferal stable isotopes in subtidal estuarine environments

Interpretation of benthic foraminiferal stable isotopes in subtidal estuarine environments

Ultrastructure and distribution of kleptoplasts in benthic foraminifera from shallow-water (photic) habitats

The response of benthic foraminifera to pollution and environmental stress in Ria de Aveiro (N Portugal)

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