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Papers by christophe mori
ABSTRACT Knowledge of the Branchiopoda of Corsica is limited. Their distribution is updated, on t... more ABSTRACT Knowledge of the Branchiopoda of Corsica is limited. Their distribution is updated, on the basis of eight years of investigations on 20 ponds. To date, three species of Anostraca and one species of Notostraca have been reported (Tanymastix stagnalis, Chirocephalus salinus, Branchipus schaefferi and Triops cancriformis cancriformis). B. schaefferi (recorded for the first time in Corsica) occurs in a single locality, C. salinus and T. cancriformis cancriformis are limited to restricted distributions, while T. stagnalis is common in temporary ponds of Corsica. Their status is assessed according to IUCN Red List criteria. Temporary habitats are endangered by human activities and require a proper conservation management.
Marine Environmental Research, Mar 1, 2021
Coastal marine vegetation has been recently highlighted for its highly efficient carbon storage c... more Coastal marine vegetation has been recently highlighted for its highly efficient carbon storage capacity. Among the sixty-four species of seagrass, Posidonia oceanica, a Mediterranean endemic species, appears to be the most effective in carbon fixation and storage. Based on new data from the study of one of the largest P. oceanica meadows in the Mediterranean Sea (100 km of coastline, 20 425 ha), and a synthesis of available data from the whole of the Mediterranean basin, the aim of this work is to evaluate the amount of carbon fixed each year by P. oceanica and sequestered in the matte, in relation with the mitigation of the impact of climate change (carbon sink). The mean total carbon fixation (blades, sheaths and rhizomes) per year varies between 33.5 and 426.6 g C.m-2 and the mean carbon sequestration (long-term sink in the matte), corresponding to the sheath and rhizome tissues, varies between 7.7 and 84.4 g C.m-2 , with a clear decreasing trend according to depth because of the meadow density decrease. The synthesis of a hundred measurements made throughout the Mediterranean Sea and at depths between 0.5 and 32.0 m provides a basis for estimating the average annual carbon fixation and sequestration rate throughout the Mediterranean basin. The fixation of the blades is estimated at 1 024 t C.ha-1 .yr-1 , that of the sheaths at 220 t C ha-1 .yr-1 and that of the rhizomes at 58 t C ha-1 .yr-1 ; i.e. a total fixation rate of 1 302 t C ha-1 .yr-1 and sequestration rate (dead sheaths and rhizomes) of 278 t C ha-1 .yr-1. This annual carbon fixation represents only 0.61% on average of CO2 emissions/releases for all Mediterranean countries but in the large Mediterranean islands this fixation is on average 3.1% and can reach almost 14.4% for Corsica. Moreover, the major advantage of the P. oceanica meadow lies in its capacity to store carbon from annual carbon sequestration for centuries to millennia and can be compared to several terrestrial ecosystems considered to be efficient in carbon storage (peatlands).
Environmental Earth Sciences, Mar 25, 2021
This article is a study of headwater catchments and streams that aims at a first morphological ty... more This article is a study of headwater catchments and streams that aims at a first morphological typology of such catchments for Corsica island. Such typology offers a base for various studies or assessments regarding, for instance, water management, geological hazards assessments or faunal and/or floral species conservation. Corsica island comprises 120 peaks over 2000 m above sea-level. Herein, the characteristics and developments of 83 Corsican headwater catchments found above 1200 m above sea-level are evaluated using a digital elevation model, a principal component analysis and a hierarchical cluster analysis based on 14 morphometric parameters. It appears that 65.31% of the data’s total variance is clarified by the first three principal components. On the first principal component maximum elevation, mean elevation, mean slope and Melton ratio are found opposed to area and perimeter. Moreover, a latitudinal gradient on the first principal component is confirmed by the supplementary variable latitude’s coordinate. On the second principal component the form factor is opposed to the Lemniscate ratio. The most representative catchment points are best highlighted in terms of the catchments of the seven main streams. The cluster analysis allows to divide the catchments into four groups or types, unequivocally reflecting the first principal component and emphasising the comparable results for the two analyses. These four types of catchments are numerically characterised by four main parameters, which are area, Melton ratio, mean elevation and mean slope. A first morphological typology for Corsican headwater catchments is proposed in accordance to both principal components and cluster analyses.
Toxicological & Environmental Chemistry, Dec 1, 1995
A minor river in eastern Corsica is highly contaminated by an abandoned realgar mine. Its As and ... more A minor river in eastern Corsica is highly contaminated by an abandoned realgar mine. Its As and Sb net supply to the Tyrrhenian Sea is assessed, with emphasize on their behaviour in the mixing zone, where their concentrations strongly increase, probably in relation with the organic matter content.
Aquatic Toxicology, Oct 1, 2009
The distribution of arsenic and antimony discharges related to a past mining activity in the Brav... more The distribution of arsenic and antimony discharges related to a past mining activity in the Bravona River and its tributary, the Presa River, was investigated. We determined levels of arsenic and antimony in the water and the biota (bryophytes, benthic macroinvertebrates and fish), along a pollution gradient. Concentrations of metalloids downstream mining wastes were significantly higher than those in reference station sites. The pattern of accumulation of arsenic in the food chain decreased as follows: macroinvertebrates > bryophytes > water > fish tissues. For antimony, the lowest concentrations were found in water. The accumulation of metals in invertebrate taxa depends on their place in the food chain, their feeding behavior, and their specific habit (lenitophilic/rheophilic species). Concentrations of both metalloids decreased with increasing trophic level.
Environmental Earth Sciences, 2021
This article is a study of headwater catchments and streams that aims at a first morphological ty... more This article is a study of headwater catchments and streams that aims at a first morphological typology of such catchments for Corsica island. Such typology offers a base for various studies or assessments regarding, for instance, water management, geological hazards assessments or faunal and/or floral species conservation. Corsica island comprises 120 peaks over 2000 m above sea-level. Herein, the characteristics and developments of 83 Corsican headwater catchments found above 1200 m above sea-level are evaluated using a digital elevation model, a principal component analysis and a hierarchical cluster analysis based on 14 morphometric parameters. It appears that 65.31% of the data’s total variance is clarified by the first three principal components. On the first principal component maximum elevation, mean elevation, mean slope and Melton ratio are found opposed to area and perimeter. Moreover, a latitudinal gradient on the first principal component is confirmed by the supplementa...
Knowledge oftheBranchiopoda ofCorsica islimited. Theirdistribution isupdated, onthebasis ofeight ... more Knowledge oftheBranchiopoda ofCorsica islimited. Theirdistribution isupdated, onthebasis ofeight yearsof investigations on20ponds. Todate, three species ofAnostraca and one species of Notostraca have been reported (Tanymastix stagnalis, Chirocephalus salinus, Branchipus schaefferi andTriops cancriformis cancriformis). B.schaefferi (recorded forthefirst timeinCorsica) occursina single locality, C.salinus andT.cancriformis cancriformis arelimited torestricted distributions, whileT.stagnalis iscommonin temporary pondsofCorsica. Their status isassessed according toIUCNRedList criteria. Temporary habitats areendangered by human activities and require a properconservation management.
![Research paper thumbnail of “Contribution of Posidonia oceanica meadows in the context of climate change mitigation in the Mediterranean Sea” [Mar. Environ. Res. 165 (2021)]](https://attachments.academia-assets.com/108029897/thumbnails/1.jpg)
](Marine Environmental Research, 2021
Coastal marine vegetation has been recently highlighted for its highly efficient carbon storage c... more Coastal marine vegetation has been recently highlighted for its highly efficient carbon storage capacity. Among the sixty-four species of seagrass, Posidonia oceanica, a Mediterranean endemic species, appears to be the most effective in carbon fixation and storage. Based on new data from the study of one of the largest P. oceanica meadows in the Mediterranean Sea (100 km of coastline, 20 425 ha), and a synthesis of available data from the whole of the Mediterranean basin, the aim of this work is to evaluate the amount of carbon fixed each year by P. oceanica and sequestered in the matte, in relation with the mitigation of the impact of climate change (carbon sink). The mean total carbon fixation (blades, sheaths and rhizomes) per year varies between 33.5 and 426.6 g C.m-2 and the mean carbon sequestration (long-term sink in the matte), corresponding to the sheath and rhizome tissues, varies between 7.7 and 84.4 g C.m-2 , with a clear decreasing trend according to depth because of the meadow density decrease. The synthesis of a hundred measurements made throughout the Mediterranean Sea and at depths between 0.5 and 32.0 m provides a basis for estimating the average annual carbon fixation and sequestration rate throughout the Mediterranean basin. The fixation of the blades is estimated at 1 024 t C.ha-1 .yr-1 , that of the sheaths at 220 t C ha-1 .yr-1 and that of the rhizomes at 58 t C ha-1 .yr-1 ; i.e. a total fixation rate of 1 302 t C ha-1 .yr-1 and sequestration rate (dead sheaths and rhizomes) of 278 t C ha-1 .yr-1. This annual carbon fixation represents only 0.61% on average of CO2 emissions/releases for all Mediterranean countries but in the large Mediterranean islands this fixation is on average 3.1% and can reach almost 14.4% for Corsica. Moreover, the major advantage of the P. oceanica meadow lies in its capacity to store carbon from annual carbon sequestration for centuries to millennia and can be compared to several terrestrial ecosystems considered to be efficient in carbon storage (peatlands).
Http Www Theses Fr, 1997
La repartition des peuplements et des especes d'invertebres benthiques a ete etudiee, dans le... more La repartition des peuplements et des especes d'invertebres benthiques a ete etudiee, dans les cours d'eau de corse, a deux echelles: le reseau hydrographique (repartition longitudinale) et la station (repartition horizontale). L'etude des microhabitats et de leurs peuplements, par l'analyse factorielle des correspondances, permet de preciser l'influence de l'hydrodynamisme et du substrat sur les caracteristiques mesologiques et faunistiques de ces cours d'eau. L'analyse de la repartition horizontale des invertebres a mis en evidence le role du substrat et du courant. Ces facteurs abiotiques de repartition, conditionnent l'habitat de chaque espece. L'analyse des peuplements des microhabitats a ete realisee sous l'angle trophique. Le mode de nutrition est une des composantes biotiques determinant la repartition. Les variations spatiales et temporelles des communautes infeodees aux differents microhabitats ont ete etudiees a l'echelle du reseau hydrographique. La dynamique temporelle de la faune benthique a ete analysee par les changements saisonniers des communautes des microhabitats. Les modifications des caracteristiques mesologiques et faunistiques induites par les perturbations naturelle (crue) et anthropique (amenagement hydroelectrique) ont fait l'objet d'une etude particuliere
2006 First International Symposium on Environment Identities and Mediterranean Area, 2006
ABSTRACT Knowledge of the Branchiopoda of Corsica is limited. Their distribution is updated, on t... more ABSTRACT Knowledge of the Branchiopoda of Corsica is limited. Their distribution is updated, on the basis of eight years of investigations on 20 ponds. To date, three species of Anostraca and one species of Notostraca have been reported (Tanymastix stagnalis, Chirocephalus salinus, Branchipus schaefferi and Triops cancriformis cancriformis). B. schaefferi (recorded for the first time in Corsica) occurs in a single locality, C. salinus and T. cancriformis cancriformis are limited to restricted distributions, while T. stagnalis is common in temporary ponds of Corsica. Their status is assessed according to IUCN Red List criteria. Temporary habitats are endangered by human activities and require a proper conservation management.
Hydrobiologia, 1999
An ancient realgar mine is responsible for the contamination of a riverine system in central Cors... more An ancient realgar mine is responsible for the contamination of a riverine system in central Corsica. Nearby the mine, high As and Sb concentrations are found (up to 2–3 mg l-1 and 2–3 µg l-1 respectively). A significant increase of the As and Sb concentrations in water is found in the water of the mixing zone of river and sea
Zoomorphology, 2006
Spermiogenesis in Mesostoma viaregginum begins with the formation of a zone of differentiation co... more Spermiogenesis in Mesostoma viaregginum begins with the formation of a zone of differentiation containing striated rootlets, two centrioles, and an intercentriolar body in-between. These centrioles generate two parallel free-flagella with the 9+''1'' pattern of the Trepaxonemata growing out in opposite directions. Spermatid differentiation is characterised by a 90°latero-ventral rotation of flagella and a subsequent distoproximal centriolar rotation, with a distal cytoplasmic projection. The former rotation involves the compression of a row of cortical microtubules and allows recognising a flagellar side and an aflagellar side in the late spermatid and in the mature spermatozoon. At the end of the differentiation, centrioles and microtubules lie parallel to the spermatid axis. The disto-proximal centriolar rotation is proposed as a synapomorphy for the Rhabdocoela. The modifications of the intercentriolar body during spermiogenesis and the migration of the nucleus and the centrioles towards the cytoplasmic distal projection are also described. The mature spermatozoon of M. viaregginum is filiform and tapered at both ends and presents many features found in the Rhabdocoela gametes. The nucleus disappears before the flagellar insertion and a density gradient of mitochondria is observed along the sperm axis. The anterior end of the spermatozoon of M. viaregginum is characterised by a tapering capped by a membrane expansion. This study has enabled us to describe precisely the orientation of spermatozoa in the Rhabdocoela in general: the centriolar extremity is proposed as the anterior one for the Rhabdocoela.
Toxicological & Environmental Chemistry, 1995
A minor river in eastern Corsica is highly contaminated by an abandoned realgar mine. Its As and ... more A minor river in eastern Corsica is highly contaminated by an abandoned realgar mine. Its As and Sb net supply to the Tyrrhenian Sea is assessed, with emphasize on their behaviour in the mixing zone, where their concentrations strongly increase, probably in relation with the organic matter content.
Ecotoxicology and Environmental Safety, 2009
The impact of arsenic (As) discharge related to a past mining activity in the Bravona River and i... more The impact of arsenic (As) discharge related to a past mining activity in the Bravona River and its tributary, the Presa River, was investigated in an edible fish, the brown trout (Salmo trutta). Fish was sampled in four stations along a contamination gradient. Arsenic was measured in five organs type (operculum, gills, liver, muscle, and axial skeleton). Almost 70 years after the suspension of the mining activity, As levels in water remain high. The results indicated a strong As contamination in fish collected downstream from the mine. The operculum, liver, and gills showed the highest As concentrations whereas levels in muscle were lower. A strong positive correlation between As concentrations in water and in tissues was observed. Bioaccumulation occurred preferentially in the gills, operculum, and liver. Since As levels in tissues of S. trutta followed the pollution gradient, this species appears useful as biomonitor for metalloid accumulation.
Aquatic Toxicology, 2009
The distribution of arsenic and antimony discharges related to a past mining activity in the Brav... more The distribution of arsenic and antimony discharges related to a past mining activity in the Bravona River and its tributary, the Presa River, was investigated. We determined levels of arsenic and antimony in the water and the biota (bryophytes, benthic macroinvertebrates and fish), along a pollution gradient. Concentrations of metalloids downstream mining wastes were significantly higher than those in reference station sites. The pattern of accumulation of arsenic in the food chain decreased as follows: macroinvertebrates > bryophytes > water > fish tissues. For antimony, the lowest concentrations were found in water. The accumulation of metals in invertebrate taxa depends on their place in the food chain, their feeding behavior, and their specific habit (lenitophilic/rheophilic species). Concentrations of both metalloids decreased with increasing trophic level.
Acta Zoologica, 1994
Spermiogenesis in M. herpestisbegins with the formation of a differentiation zone which contains ... more Spermiogenesis in M. herpestisbegins with the formation of a differentiation zone which contains two centrioles associated with an electron–dense, finely granular material. This granular material very quickly becomes striated, a median cytoplasmic extension forms, one of the centrioles becomes laterally oriented in a cytoplasmic bud and the other gives rise to a flagellum. After the migration of the nucleus, a helicoidal crested–like body forms, then the old spermatid separates from the residual cytoplasm. The mature M. herpestisspermatozoon exhibits an apical cone of electron–dense material, a crested–like body and cortical microtubules which are electron–dense centred and spiralized except at their posterior extremity where they are parallel to the spermatozoon axis. The axoneme is of the 9 + ‘1’ pattern. It reaches the posterior extremity of the gamete where the cytoplasm is very electron–dense. The presence of centrioles flanked by ‘striated roots’ has never, to our knowledge, b...
Hydrobiologia, 1999
The chemical and biological characteristics of a Corsican river that drains contaminated waters a... more The chemical and biological characteristics of a Corsican river that drains contaminated waters and sediment from an abandoned realgar mine were studied. The concentrations of pollutants such as As and Sb were found to be notably high. For example, in the Presa River, downstream the realgar mine, the mean As concentrations in the water and in the sediment were 3010
ABSTRACT Knowledge of the Branchiopoda of Corsica is limited. Their distribution is updated, on t... more ABSTRACT Knowledge of the Branchiopoda of Corsica is limited. Their distribution is updated, on the basis of eight years of investigations on 20 ponds. To date, three species of Anostraca and one species of Notostraca have been reported (Tanymastix stagnalis, Chirocephalus salinus, Branchipus schaefferi and Triops cancriformis cancriformis). B. schaefferi (recorded for the first time in Corsica) occurs in a single locality, C. salinus and T. cancriformis cancriformis are limited to restricted distributions, while T. stagnalis is common in temporary ponds of Corsica. Their status is assessed according to IUCN Red List criteria. Temporary habitats are endangered by human activities and require a proper conservation management.
Marine Environmental Research, Mar 1, 2021
Coastal marine vegetation has been recently highlighted for its highly efficient carbon storage c... more Coastal marine vegetation has been recently highlighted for its highly efficient carbon storage capacity. Among the sixty-four species of seagrass, Posidonia oceanica, a Mediterranean endemic species, appears to be the most effective in carbon fixation and storage. Based on new data from the study of one of the largest P. oceanica meadows in the Mediterranean Sea (100 km of coastline, 20 425 ha), and a synthesis of available data from the whole of the Mediterranean basin, the aim of this work is to evaluate the amount of carbon fixed each year by P. oceanica and sequestered in the matte, in relation with the mitigation of the impact of climate change (carbon sink). The mean total carbon fixation (blades, sheaths and rhizomes) per year varies between 33.5 and 426.6 g C.m-2 and the mean carbon sequestration (long-term sink in the matte), corresponding to the sheath and rhizome tissues, varies between 7.7 and 84.4 g C.m-2 , with a clear decreasing trend according to depth because of the meadow density decrease. The synthesis of a hundred measurements made throughout the Mediterranean Sea and at depths between 0.5 and 32.0 m provides a basis for estimating the average annual carbon fixation and sequestration rate throughout the Mediterranean basin. The fixation of the blades is estimated at 1 024 t C.ha-1 .yr-1 , that of the sheaths at 220 t C ha-1 .yr-1 and that of the rhizomes at 58 t C ha-1 .yr-1 ; i.e. a total fixation rate of 1 302 t C ha-1 .yr-1 and sequestration rate (dead sheaths and rhizomes) of 278 t C ha-1 .yr-1. This annual carbon fixation represents only 0.61% on average of CO2 emissions/releases for all Mediterranean countries but in the large Mediterranean islands this fixation is on average 3.1% and can reach almost 14.4% for Corsica. Moreover, the major advantage of the P. oceanica meadow lies in its capacity to store carbon from annual carbon sequestration for centuries to millennia and can be compared to several terrestrial ecosystems considered to be efficient in carbon storage (peatlands).
Environmental Earth Sciences, Mar 25, 2021
This article is a study of headwater catchments and streams that aims at a first morphological ty... more This article is a study of headwater catchments and streams that aims at a first morphological typology of such catchments for Corsica island. Such typology offers a base for various studies or assessments regarding, for instance, water management, geological hazards assessments or faunal and/or floral species conservation. Corsica island comprises 120 peaks over 2000 m above sea-level. Herein, the characteristics and developments of 83 Corsican headwater catchments found above 1200 m above sea-level are evaluated using a digital elevation model, a principal component analysis and a hierarchical cluster analysis based on 14 morphometric parameters. It appears that 65.31% of the data’s total variance is clarified by the first three principal components. On the first principal component maximum elevation, mean elevation, mean slope and Melton ratio are found opposed to area and perimeter. Moreover, a latitudinal gradient on the first principal component is confirmed by the supplementary variable latitude’s coordinate. On the second principal component the form factor is opposed to the Lemniscate ratio. The most representative catchment points are best highlighted in terms of the catchments of the seven main streams. The cluster analysis allows to divide the catchments into four groups or types, unequivocally reflecting the first principal component and emphasising the comparable results for the two analyses. These four types of catchments are numerically characterised by four main parameters, which are area, Melton ratio, mean elevation and mean slope. A first morphological typology for Corsican headwater catchments is proposed in accordance to both principal components and cluster analyses.
Toxicological & Environmental Chemistry, Dec 1, 1995
A minor river in eastern Corsica is highly contaminated by an abandoned realgar mine. Its As and ... more A minor river in eastern Corsica is highly contaminated by an abandoned realgar mine. Its As and Sb net supply to the Tyrrhenian Sea is assessed, with emphasize on their behaviour in the mixing zone, where their concentrations strongly increase, probably in relation with the organic matter content.
Aquatic Toxicology, Oct 1, 2009
The distribution of arsenic and antimony discharges related to a past mining activity in the Brav... more The distribution of arsenic and antimony discharges related to a past mining activity in the Bravona River and its tributary, the Presa River, was investigated. We determined levels of arsenic and antimony in the water and the biota (bryophytes, benthic macroinvertebrates and fish), along a pollution gradient. Concentrations of metalloids downstream mining wastes were significantly higher than those in reference station sites. The pattern of accumulation of arsenic in the food chain decreased as follows: macroinvertebrates > bryophytes > water > fish tissues. For antimony, the lowest concentrations were found in water. The accumulation of metals in invertebrate taxa depends on their place in the food chain, their feeding behavior, and their specific habit (lenitophilic/rheophilic species). Concentrations of both metalloids decreased with increasing trophic level.
Environmental Earth Sciences, 2021
This article is a study of headwater catchments and streams that aims at a first morphological ty... more This article is a study of headwater catchments and streams that aims at a first morphological typology of such catchments for Corsica island. Such typology offers a base for various studies or assessments regarding, for instance, water management, geological hazards assessments or faunal and/or floral species conservation. Corsica island comprises 120 peaks over 2000 m above sea-level. Herein, the characteristics and developments of 83 Corsican headwater catchments found above 1200 m above sea-level are evaluated using a digital elevation model, a principal component analysis and a hierarchical cluster analysis based on 14 morphometric parameters. It appears that 65.31% of the data’s total variance is clarified by the first three principal components. On the first principal component maximum elevation, mean elevation, mean slope and Melton ratio are found opposed to area and perimeter. Moreover, a latitudinal gradient on the first principal component is confirmed by the supplementa...
Knowledge oftheBranchiopoda ofCorsica islimited. Theirdistribution isupdated, onthebasis ofeight ... more Knowledge oftheBranchiopoda ofCorsica islimited. Theirdistribution isupdated, onthebasis ofeight yearsof investigations on20ponds. Todate, three species ofAnostraca and one species of Notostraca have been reported (Tanymastix stagnalis, Chirocephalus salinus, Branchipus schaefferi andTriops cancriformis cancriformis). B.schaefferi (recorded forthefirst timeinCorsica) occursina single locality, C.salinus andT.cancriformis cancriformis arelimited torestricted distributions, whileT.stagnalis iscommonin temporary pondsofCorsica. Their status isassessed according toIUCNRedList criteria. Temporary habitats areendangered by human activities and require a properconservation management.
Marine Environmental Research, 2021
Coastal marine vegetation has been recently highlighted for its highly efficient carbon storage c... more Coastal marine vegetation has been recently highlighted for its highly efficient carbon storage capacity. Among the sixty-four species of seagrass, Posidonia oceanica, a Mediterranean endemic species, appears to be the most effective in carbon fixation and storage. Based on new data from the study of one of the largest P. oceanica meadows in the Mediterranean Sea (100 km of coastline, 20 425 ha), and a synthesis of available data from the whole of the Mediterranean basin, the aim of this work is to evaluate the amount of carbon fixed each year by P. oceanica and sequestered in the matte, in relation with the mitigation of the impact of climate change (carbon sink). The mean total carbon fixation (blades, sheaths and rhizomes) per year varies between 33.5 and 426.6 g C.m-2 and the mean carbon sequestration (long-term sink in the matte), corresponding to the sheath and rhizome tissues, varies between 7.7 and 84.4 g C.m-2 , with a clear decreasing trend according to depth because of the meadow density decrease. The synthesis of a hundred measurements made throughout the Mediterranean Sea and at depths between 0.5 and 32.0 m provides a basis for estimating the average annual carbon fixation and sequestration rate throughout the Mediterranean basin. The fixation of the blades is estimated at 1 024 t C.ha-1 .yr-1 , that of the sheaths at 220 t C ha-1 .yr-1 and that of the rhizomes at 58 t C ha-1 .yr-1 ; i.e. a total fixation rate of 1 302 t C ha-1 .yr-1 and sequestration rate (dead sheaths and rhizomes) of 278 t C ha-1 .yr-1. This annual carbon fixation represents only 0.61% on average of CO2 emissions/releases for all Mediterranean countries but in the large Mediterranean islands this fixation is on average 3.1% and can reach almost 14.4% for Corsica. Moreover, the major advantage of the P. oceanica meadow lies in its capacity to store carbon from annual carbon sequestration for centuries to millennia and can be compared to several terrestrial ecosystems considered to be efficient in carbon storage (peatlands).
Http Www Theses Fr, 1997
La repartition des peuplements et des especes d'invertebres benthiques a ete etudiee, dans le... more La repartition des peuplements et des especes d'invertebres benthiques a ete etudiee, dans les cours d'eau de corse, a deux echelles: le reseau hydrographique (repartition longitudinale) et la station (repartition horizontale). L'etude des microhabitats et de leurs peuplements, par l'analyse factorielle des correspondances, permet de preciser l'influence de l'hydrodynamisme et du substrat sur les caracteristiques mesologiques et faunistiques de ces cours d'eau. L'analyse de la repartition horizontale des invertebres a mis en evidence le role du substrat et du courant. Ces facteurs abiotiques de repartition, conditionnent l'habitat de chaque espece. L'analyse des peuplements des microhabitats a ete realisee sous l'angle trophique. Le mode de nutrition est une des composantes biotiques determinant la repartition. Les variations spatiales et temporelles des communautes infeodees aux differents microhabitats ont ete etudiees a l'echelle du reseau hydrographique. La dynamique temporelle de la faune benthique a ete analysee par les changements saisonniers des communautes des microhabitats. Les modifications des caracteristiques mesologiques et faunistiques induites par les perturbations naturelle (crue) et anthropique (amenagement hydroelectrique) ont fait l'objet d'une etude particuliere
2006 First International Symposium on Environment Identities and Mediterranean Area, 2006
ABSTRACT Knowledge of the Branchiopoda of Corsica is limited. Their distribution is updated, on t... more ABSTRACT Knowledge of the Branchiopoda of Corsica is limited. Their distribution is updated, on the basis of eight years of investigations on 20 ponds. To date, three species of Anostraca and one species of Notostraca have been reported (Tanymastix stagnalis, Chirocephalus salinus, Branchipus schaefferi and Triops cancriformis cancriformis). B. schaefferi (recorded for the first time in Corsica) occurs in a single locality, C. salinus and T. cancriformis cancriformis are limited to restricted distributions, while T. stagnalis is common in temporary ponds of Corsica. Their status is assessed according to IUCN Red List criteria. Temporary habitats are endangered by human activities and require a proper conservation management.
Hydrobiologia, 1999
An ancient realgar mine is responsible for the contamination of a riverine system in central Cors... more An ancient realgar mine is responsible for the contamination of a riverine system in central Corsica. Nearby the mine, high As and Sb concentrations are found (up to 2–3 mg l-1 and 2–3 µg l-1 respectively). A significant increase of the As and Sb concentrations in water is found in the water of the mixing zone of river and sea
Zoomorphology, 2006
Spermiogenesis in Mesostoma viaregginum begins with the formation of a zone of differentiation co... more Spermiogenesis in Mesostoma viaregginum begins with the formation of a zone of differentiation containing striated rootlets, two centrioles, and an intercentriolar body in-between. These centrioles generate two parallel free-flagella with the 9+''1'' pattern of the Trepaxonemata growing out in opposite directions. Spermatid differentiation is characterised by a 90°latero-ventral rotation of flagella and a subsequent distoproximal centriolar rotation, with a distal cytoplasmic projection. The former rotation involves the compression of a row of cortical microtubules and allows recognising a flagellar side and an aflagellar side in the late spermatid and in the mature spermatozoon. At the end of the differentiation, centrioles and microtubules lie parallel to the spermatid axis. The disto-proximal centriolar rotation is proposed as a synapomorphy for the Rhabdocoela. The modifications of the intercentriolar body during spermiogenesis and the migration of the nucleus and the centrioles towards the cytoplasmic distal projection are also described. The mature spermatozoon of M. viaregginum is filiform and tapered at both ends and presents many features found in the Rhabdocoela gametes. The nucleus disappears before the flagellar insertion and a density gradient of mitochondria is observed along the sperm axis. The anterior end of the spermatozoon of M. viaregginum is characterised by a tapering capped by a membrane expansion. This study has enabled us to describe precisely the orientation of spermatozoa in the Rhabdocoela in general: the centriolar extremity is proposed as the anterior one for the Rhabdocoela.
Toxicological & Environmental Chemistry, 1995
A minor river in eastern Corsica is highly contaminated by an abandoned realgar mine. Its As and ... more A minor river in eastern Corsica is highly contaminated by an abandoned realgar mine. Its As and Sb net supply to the Tyrrhenian Sea is assessed, with emphasize on their behaviour in the mixing zone, where their concentrations strongly increase, probably in relation with the organic matter content.
Ecotoxicology and Environmental Safety, 2009
The impact of arsenic (As) discharge related to a past mining activity in the Bravona River and i... more The impact of arsenic (As) discharge related to a past mining activity in the Bravona River and its tributary, the Presa River, was investigated in an edible fish, the brown trout (Salmo trutta). Fish was sampled in four stations along a contamination gradient. Arsenic was measured in five organs type (operculum, gills, liver, muscle, and axial skeleton). Almost 70 years after the suspension of the mining activity, As levels in water remain high. The results indicated a strong As contamination in fish collected downstream from the mine. The operculum, liver, and gills showed the highest As concentrations whereas levels in muscle were lower. A strong positive correlation between As concentrations in water and in tissues was observed. Bioaccumulation occurred preferentially in the gills, operculum, and liver. Since As levels in tissues of S. trutta followed the pollution gradient, this species appears useful as biomonitor for metalloid accumulation.
Aquatic Toxicology, 2009
The distribution of arsenic and antimony discharges related to a past mining activity in the Brav... more The distribution of arsenic and antimony discharges related to a past mining activity in the Bravona River and its tributary, the Presa River, was investigated. We determined levels of arsenic and antimony in the water and the biota (bryophytes, benthic macroinvertebrates and fish), along a pollution gradient. Concentrations of metalloids downstream mining wastes were significantly higher than those in reference station sites. The pattern of accumulation of arsenic in the food chain decreased as follows: macroinvertebrates > bryophytes > water > fish tissues. For antimony, the lowest concentrations were found in water. The accumulation of metals in invertebrate taxa depends on their place in the food chain, their feeding behavior, and their specific habit (lenitophilic/rheophilic species). Concentrations of both metalloids decreased with increasing trophic level.
Acta Zoologica, 1994
Spermiogenesis in M. herpestisbegins with the formation of a differentiation zone which contains ... more Spermiogenesis in M. herpestisbegins with the formation of a differentiation zone which contains two centrioles associated with an electron–dense, finely granular material. This granular material very quickly becomes striated, a median cytoplasmic extension forms, one of the centrioles becomes laterally oriented in a cytoplasmic bud and the other gives rise to a flagellum. After the migration of the nucleus, a helicoidal crested–like body forms, then the old spermatid separates from the residual cytoplasm. The mature M. herpestisspermatozoon exhibits an apical cone of electron–dense material, a crested–like body and cortical microtubules which are electron–dense centred and spiralized except at their posterior extremity where they are parallel to the spermatozoon axis. The axoneme is of the 9 + ‘1’ pattern. It reaches the posterior extremity of the gamete where the cytoplasm is very electron–dense. The presence of centrioles flanked by ‘striated roots’ has never, to our knowledge, b...
Hydrobiologia, 1999
The chemical and biological characteristics of a Corsican river that drains contaminated waters a... more The chemical and biological characteristics of a Corsican river that drains contaminated waters and sediment from an abandoned realgar mine were studied. The concentrations of pollutants such as As and Sb were found to be notably high. For example, in the Presa River, downstream the realgar mine, the mean As concentrations in the water and in the sediment were 3010