Frans Jorissen

Frans Jorissen
University of Angers | UA · Laboratoire d’études des Bio-Indicateurs Actuels et Fossiles (LPGN-BIAF)

Prof.

About

247
Publications
49,542
Reads
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15,935
Citations
Additional affiliations
September 2001 - present
University of Angers
Position
  • Professor (Full)
September 1992 - August 2001
Université Bordeaux 1
Position
  • Professor (Associate)
September 1982 - August 1991
Utrecht University
Position
  • PostDoc Position

Publications

Publications (247)
Preprint
Assuming that foraminiferal clumped isotope (Δ47) values are independent of seawater salinity and pH, the combination of Mg/Ca, δ18O and Δ47 values, may in theory allow us to disentangle the temperature, salinity/δ18Osw and pH signals. Here, we present a new Mg/Ca-Δ47 dataset for modern planktonic foraminifera, from various oceanographic basins and...
Article
Full-text available
In this paper, we propose a marine influence index (MII), which is thought to give an integrated quantitative description of the complex of the environmental parameters controlling the foraminiferal fauna in estuarine intertidal mudflats. The MII contains three components, as follows: (1) the relative distance along the salinity gradient, (2) the e...
Article
Full-text available
This study focuses on the foraminiferal distribution on intertidal mudflats of two contrasted estuaries (Auray and Vie) along the French Atlantic coast. In both estuaries, the foraminiferal communities are dominated by Haynesina germanica and the Ammonia tepida group. Stations located near the outlets show a high diversity and abundance of species...
Article
The 4GFOR model presented in this paper combines the OMEXDIA model of Soetaert et al. (1996) with four theoretical species of benthic foraminifera. The geochemical part of the model simulates the succession of early diagenetic redox reactions in the superficial sediment layers. The four theoretical foraminiferal species, which each represent a grou...
Article
Full-text available
Coastal environments are exposed to numerous pressures that potentially affect marine soft bottom faunas. Among these pressures, organic matter enrichment is very frequent. Several indices based on living (Rose Bengal-stained) foraminiferal communities have recently been developed to assess the induced impact and determine the environmental quality...
Article
Full-text available
Ammonia is one of the most widespread foraminiferal genera worldwide. Three phylotypes (Ammonia sp. T1, T2 and T6), commonly encountered in the northeast Atlantic, are usually associated with the morphospecies Ammonia tepida. The biogeographic distribution of these three types was previously investigated in coastal environments around Great Britain...
Article
Full-text available
Coastal environments are affected by multiple pressures resulting from anthropogenic activities, among which organic enrichment (C org) is particularly important. Foraminiferal communities react to organic enrichment by changes in community structure (density, diversity, species composition) and behaviour (metabolism, feeding strategy, reproduction...
Article
The Lesser Antilles are a densely populated region where local populations and industrial facilities are concentrated at the coastlines, and are therefore exposed to many rapid-onset hazards such as hurricanes and tsunamis. However, the historical catalog of these events is too short to allow risk assessment and return period estimations, and it ne...
Article
Full-text available
Over the last decades, hypoxia in marine coastal environments has become more and more widespread, prolonged and intense. Hypoxic events have large consequences for the functioning of benthic ecosystems. In severe cases, they may lead to complete anoxia and the presence of toxic sulfides in the sediment and bottom-water, thereby strongly affecting...
Preprint
Full-text available
Over the last decades, hypoxia in marine coastal environments have become more and more widespread, prolonged and intense. These hypoxic events have large consequences for the functioning of benthic ecosystems. They profoundly modify early diagenetic processes involved in organic matter recycling, and in severe cases, they may lead to complete anox...
Article
Paleostudies often rely on foraminiferal calcite chemistry, which reflect past sea water condition through so-called proxy relationships. One way to evaluate robustness of these proxy relationships is to test them in well-studied and during well-constrained climate transitions. The southeastern (SE) Mediterranean is a perfect natural laboratory wit...
Article
Full-text available
Due to climate warming and increased anthropogenic impact, a decrease of ocean water oxygenation is expected in the near future, with major consequences for marine life. In this context, it is essential to develop reliable tools to assess past oxygen concentrations in the ocean, to better forecast these future changes. Recently, foraminiferal pore...
Article
We have studied benthic foraminiferal assemblages in a marine sediment section (Pefka E section) from the Lindos Bay Formation deposited during the early Pleistocene to provide new insights into the paleo-ecologic and neotectonic evolution of the SE part of the island of Rhodes (NE Mediterranean Sea). Relatively high amounts of eutrophic/low oxygen...
Article
Climate variability has major implications for marine geochemical cycles and biogenic carbonate production. Therefore, past climate-driven changes in marine environments are often inferred from geochemical data of the marine carbonate archive. Proxy calibration studies are essential for the reconstruction of such past environmental changes. Here, w...
Article
The high morphological variability observed in the genus Ammonia, together with its global distribution, led to the description of a plethora of species, subspecies, and varieties. Until now, many researchers used a limited number of (morpho-)species, and considered the numerous varieties as ecophenotypes. Recently, molecular studies show that thes...
Article
Full-text available
The high morphological variability observed in the genus Ammonia, together with its global distribution, led to the description of a plethora of species, subspecies, and varieties. Until now, many researchers used a limited number of (morpho-)species, and considered the numerous varieties as ecophenotypes. Recently, molecular studies show that thes...
Data
This data set contains census counts of Early Pleistocene benthic foraminifera on species level (fraction >125 µm) from a Lindos Bay Clay deposit in SE Rhodes. Census counts on genus level of the >125 and >150 µm fractions from the same samples can be found under https://doi.org/10.1594/PANGAEA.884573.
Article
Full-text available
Manganese geochemistry in deep-sea sediments is known to vary greatly over the first few centimeters, which overlaps the in-sediment depth habitats of several benthic foraminiferal species. Here we investigated manganese incorporation in benthic foraminiferal shell carbonate across a six-station depth transect in the Gulf of Lions, NW Mediterranean...
Article
Accurate reconstruction of past ocean temperatures is of critical importance to paleoclimatology. Carbonate clumped isotope thermometry (“Δ47”) is a relatively recent technique based on the strong relationship between calcification temperature and the statistical excess of ¹³C–¹⁸O bonds in carbonates. Its application to foraminifera holds great sci...
Article
In recent years, living (Rose Bengal-stained) benthic foraminifera are increasingly used in biomonitoring studies, with the international expert group FOBIMO proposing the development of standardised methods. Until now, it has been considered inadvisable to concentrate foraminifera by density separation, because this may bias the composition of the...
Article
In the context of recent climate change and increased anthropogenic activities in coastal areas, which both may have a negative impact on dissolved oxygen concentration, there is an increased interest to better understand the mechanisms and evolution leading to hypoxia in marine environments. The development of well calibrated proxies is crucial to...
Article
Most environmental bio-monitoring methods using the species composition of marine faunas define the Ecological Quality Status of soft bottom ecosystems based on the relative proportions of species assigned to a limited number of ecological categories. In this study we analyse the distribution patterns of benthic foraminifera in the Mediterranean as...
Article
Full-text available
Manganese geochemistry in deep-sea sediments is known to vary greatly over the first few centimeters, which overlaps with the in-sediment depth habitats of several benthic foraminiferal species. Here we investigated manganese incorporation in benthic foraminiferal shell carbonate across a 6-station depth transect in the Gulf of Lions, NW Mediterran...
Article
Full-text available
The adaptation of some benthic foraminiferal species to low-oxygen conditions provides the prospect of using the chemical composition of their tests as proxies for bottom water oxygenation. Manganese may be particularly suitable as such a geochemical proxy because this redox element is soluble in reduced form (Mn²⁺) and hence can be incorporated in...
Article
Full-text available
We present paleo-water depth reconstructions for the Pefka E section deposited on the island of Rhodes (Greece) during the early Pleistocene. For these reconstructions, a transfer function (TF) using modern benthic foraminifera surface samples from the Adriatic and Western Mediterranean Seas has been developed. The TF model gives an overall predict...
Data
Taxonomic list of species used in this study. (XLSX)
Data
Additional figures and tables. Evaluation of the reaction norm test, ordination analyses, abundances of species in the samples, ecological preferences of the species, transfer function evaluation. (DOCX)
Article
Full-text available
Costate species of Bulimina are cosmopolitan, infaunal benthic foraminifers which are common in the fossil record since the Paleogene. In the present study, we evaluate the temperature dependency of Mg/Ca ratios in Bulimina inflata, B. mexicana and B. costata from an extensive set of core-top samples from the Atlantic, Pacific and Indian Oceans. Th...
Conference Paper
Full-text available
The Mn/Ca ratios of benthic foraminifera represent an emerging proxy to trace past ocean hypoxia (O2 < 63 µmol/L). The redox element manganese is soluble in its reduced form (Mn2+), therefore Mn can be incorporated into the tests of benthic foraminifera under low oxygen conditions. We studied, in laboratory experiments and by in situ recent observa...
Article
The temperature of the deep ocean plays a vital role in the Earth’s climate system. Paleo-reconstructions of deep-sea temperatures have traditionally been based on the oxygen isotope composition of deep-sea benthic foraminiferal calcite shells, although this parameter depends upon polar ice volume as well as temperature. More recent reconstructions...
Article
Full-text available
The adaptation of some benthic foraminiferal species to low oxygen conditions provides the prospect of using the chemical composition of their tests as proxies for bottom water oxygenation. Manganese may be particularly suitable as such a geochemical proxy, because this redox element is soluble in reduced form (Mn²⁺), and hence can be incorporated...
Poster
Full-text available
In shelf and intertidal environments, benthic foraminiferal assemblages have been used in the past to successfully reconstruct Holocene relative sea-level changes. However, their applicability to reconstruct sea-levels in deeper habitats and over longer time-scales still needs to be investigated. Here, we present results from the application of a t...
Article
Haynesina germanica is a coastal benthic foraminifer known to sequester chloroplasts from benthic pennate diatoms. This study investigates its cellular organization, as well as the oxygen consumption and production rates under dark and light conditions. The implications of the sequestered chloroplasts are subsequently discussed at an individual and...
Poster
Full-text available
Sediments are key archives for evidencing storm or tsunami-related past marine floods and estimation of their return periods. Sediment records of marine flood usually consist of a grain size anomaly, related to the onshore transport of coarse sediments from the eroded barrier to the back barrier area. Given a large number of coasts are not bounded...
Article
Full-text available
We have determined stable carbon isotope ratios of epifaunal and shallow infaunal benthic foraminifera in the Mediterranean Sea to relate the inferred gradient of pore water δ¹³CDIC to varying trophic conditions. This is a prerequisite for developing this difference into a potential transfer function for organic matter flux rates. The data set is b...
Article
Benthic foraminiferal pores are considered to play an important role in facilitating the gas exchange between the organism and the environment, with pore size and density supposed to be related to gas exchange intensity. Recent studies have therefore attempted to establish relationships between pore patterns and redox conditions, such as bottom wat...
Article
We have determined stable carbon isotope ratios of epifaunal and shallow infaunal benthic foraminifera to relate the inferred gradient of pore water δ13CDIC to varying trophic conditions, and to test the potential of developing a transfer function for organic matter flux rates. The data set is based on samples retrieved from a well-defined bathymet...
Article
Full-text available
Some benthic foraminifera have the ability to incorporate functional chloroplasts from diatoms (kleptoplasty). Our objective was to investigate chloroplast functionality of two benthic foraminifera (Haynesina germanica and Ammonia tepida) exposed to different irradiance levels (0, 25, 70 µmol photon m−2 s−1) using spectral reflectance, epifluoresce...
Preprint
Full-text available
Some benthic foraminifera have the ability to incorporate functional chloroplasts from diatoms (kleptoplasty). Our objective was to investigate chloroplast functionality of two benthic foraminifera (Haynesina germanica and Ammonia tepida) exposed to different irradiance levels (0, 25, 70 μmol photon m-2 s-1) using spectral reflectance, epifluoresce...
Article
Full-text available
We present a new rapid and accurate protocol to simultaneously sample benthic living foraminifera in two dimensions in a centimetre-scale vertical grid and dissolved iron and phosphorus in two dimensions at high resolution (200 μm). Such an approach appears crucial for the study of foraminiferal ecology in highly dynamic and heterogeneous sedimenta...
Article
Full-text available
Rose-Bengal-stained foraminiferal assemblages (> 150 μm) were analysed along a five-station bathymetric transect across the core and the lower part of the oxygen minimum zone (OMZ) on the Indian margin of the Arabian Sea. Sediment cores were collected using the manned submersible Shinkai 6500 during the RV Yokosuka cruise YK08-11 in the post-monsoo...
Article
Full-text available
We present a new rapid and accurate protocol to simultaneously sample benthic living foraminifera in two dimensions in a centimeter scale vertical grid and dissolved iron in high resolution (200 μm). Such an approach appears crucial to study foraminiferal ecology in heterogeneous environments. The foraminiferal faunas of the main intertidal mudflat...