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Tolerance and accumulation of copper in the salt-marsh shrub Halimione portulacoides Full text
2012
Cambrollé, J. | Mancilla-Leytón, J.M. | Muñoz-Vallés, S. | Luque, T. | Figueroa, M.E.
Tolerance and accumulation of copper in the salt-marsh shrub Halimione portulacoides Full text
2012
Cambrollé, J. | Mancilla-Leytón, J.M. | Muñoz-Vallés, S. | Luque, T. | Figueroa, M.E.
The present study evaluated the tolerance and accumulation potential in the salt-marsh shrub Halimione portulacoides under moderate and high external Cu levels. A greenhouse experiment was conducted in order to investigate the effects of a range of external Cu concentrations (0 to 60mmoll⁻¹) on growth and photosynthetic performance by measuring gas exchange, chlorophyll fluorescence parameters and photosynthetic pigments. We also determined total copper, nitrogen, phosphorus and sulfur concentrations in the plant tissues. H. portulacoides survived with external Cu concentrations of up to 35mmolCul⁻¹, although the excess of metal resulted in a biomass reduction of 48%. The effects of Cu on growth were linked to a drastic reduction in net photosynthesis. However, H. portulacoides tolerated Cu levels of up to 15mmolCul⁻¹ without suffering adverse physiological effects. Our results indicate that this species could play an important role in the restoration of Cu-contaminated soils.
Show more [+] Less [-]Tolerance and accumulation of copper in the salt-marsh shrub Halimione portulacoides Full text
2012
Cambrollé Silva, Jesús | Mancilla Leytón, Juan Manuel | Muñoz Vallés, Sara | Luque Palomo, María Teresa | Figueroa Clemente, Manuel Enrique | Universidad de Sevilla. Departamento de Biología Vegetal y Ecología | Universidad de Sevilla. Departamento de Agronomía
The present study evaluated the tolerance and accumulation potential in the salt-marsh shrub Halimione portulacoides under moderate and high external Cu levels. A greenhouse experiment was conducted in order to investigate the effects of a range of external Cu concentrations (0 to 60 mmol l−1) on growth and photosynthetic performance by measuring gas exchange, chlorophyll fluorescence parameters and photosynthetic pigments. We also determined total copper, nitrogen, phosphorus and sulfur concentrations in the plant tissues. H. portulacoides survived with external Cu concentrations of up to 35 mmol Cu l−1, although the excess of metal resulted in a biomass reduction of 48%. The effects of Cu on growth were linked to a drastic reduction in net photosynthesis. However, H. portulacoides tolerated Cu levels of up to 15 mmol Cu l−1 without suffering adverse physiological effects. Our results indicate that this species could play an important role in the restoration of Cu-contaminated soils.
Show more [+] Less [-]Microbiological and physicochemical analysis of the coastal waters of southern Brazil Full text
2012
Moresco, V. | Viancelli, A. | Nascimento, M.A. | Souza, D.S.M. | Ramos, A.P.D. | Garcia, L.A.T. | Simões, C.M.O. | Barardi, C.R.M.
Microbiological and physicochemical analysis of the coastal waters of southern Brazil Full text
2012
Moresco, V. | Viancelli, A. | Nascimento, M.A. | Souza, D.S.M. | Ramos, A.P.D. | Garcia, L.A.T. | Simões, C.M.O. | Barardi, C.R.M.
The aim of this study was to assess the impact of sewage discharge on coastal waters by evaluating the influence of physicochemical parameters on the presence of enteric microorganisms in seawater samples collected from 11 beaches in Florianopolis, Santa Catarina, Brazil, over a one-year period (August 2009 to July 2010). Samples were assessed for the presence of human adenoviruses (HAdV), polyomavirus (JCPyV), hepatitis A virus (HAV), and noroviruses (HuNoV GI and GII). Escherichia coli and physicochemical parameters (salinity, temperature, pH and dissolved oxygen) were also evaluated. From the 132 samples analyzed, 55% were positive for HAdV, 51.5% for HAV, 7.5% for HuNoV GI, 4.5% for HuNoV GII, and 3% for JCPyV. E. coli levels ranged from 8 to 1325CFU/100mL at all sites. The overall results highlight the problem of sewage discharge into coastal waters and confirm that there is no correlation between viral presence and bacterial contamination.
Show more [+] Less [-]Microbiological and physicochemical analysis of the coastal waters of southern Brazil Full text
2011
Moresco, Vanessa | Viancelli, Aline | Nascimento, Mariana de Almeida do | Souza, Doris Sobral Marques | Ramos, Ana Paula Dores | Garcia, Lucas Ariel Totaro | Simões, Claudia Maria de Oliveira | Barardi, Celia Regina Monte | CAPES | CNPq | MAPA | Federal University of Santa Catarina, Brazil | Federal University of Santa Catarina, Brazil | Federal University of Santa Catarina, Brazil | Federal University of Santa Catarina, Brazil | Federal University of Santa Catarina, Brazil | Federal University of Santa Catarina, Brazil | Federal University of Santa Catarina, Brazil | Federal University of Santa Catarina, Brazil | 0000-0002-8699-8179
The aim of this study was to assess the impact of sewage discharge on coastal waters by evaluating the influence of physicochemical parameters on the presence of enteric microorganisms in seawater samples collected from 11 beaches in Florianopolis, Santa Catarina, Brazil, over a one-year period (August 2009 to July 2010). Samples were assessed for the presence of human adenoviruses (HAdV), polyomavirus (JCPyV), hepatitis A virus (HAV), and noroviruses (HuNoV GI and GII). Escherichia coli and physicochemical parameters (salinity, temperature, pH and dissolved oxygen) were also evaluated. From the 132 samples analyzed, 55% were positive for HAdV, 51.5% for HAV, 7.5% for HuNoV GI, 4.5% for HuNoV GII, and 3% for JCPyV. E. coli levels ranged from 8 to 1325 CFU/100 mL at all sites. The overall results highlight the problem of sewage discharge into coastal waters and confirm that there is no correlation between viral presence and bacterial contamination.
Show more [+] Less [-]A comparison of integrated and discrete depth sampling for monitoring toxic species of Dinophysis Full text
2012
Escalera, Laura | Pazos, Yolanda | Dolores Doval, María | Reguera, Beatriz
A comparison of integrated and discrete depth sampling for monitoring toxic species of Dinophysis Full text
2012
Escalera, Laura | Pazos, Yolanda | Dolores Doval, María | Reguera, Beatriz
Dinophysis acuminata and Dinophysis acuta produce lipophilic toxins that cause most shellfish harvesting closures in the Atlantic coastal waters of Europe. Dinophysis often exhibit patchy distributions and sampling with conventional methods may fail to detect them. A 6-month calibration study in 2006, plus an additional sampling in 2010 were carried out in Galicia to compare Dinophysis counts obtained from weekly high vertical resolution bottle samples with depth-integrated hose samples. Counts with these two methods were comparable at some depth-ranges, but hose maxima were over one order of magnitude lower under thin-layer scenarios. Estimates from hose samplers should be used with caution in programmes using a “Dinophysis index”, either to trigger shellfish sampling or to establish precautionary harvesting closures. In general, hose samplers provide reliable information on the occurrence of Dinophysis except under extreme site-specific hydrodynamic conditions. This study adds new information about the heterogeneous, specific vertical distributions of two Dinophysis spp.
Show more [+] Less [-]A comparison of integrated and discrete depth sampling for monitoring Dinophysis. Full text
2012
Escalera-Moura, Laura | Pazos, Yolanda | Doval, M. Dolores | Reguera Ramírez, Beatriz
Dinophysis acuminata and Dinophysis acuta produce lipophilic toxins that cause most shellfish harvesting closures in the Atlantic coastal waters of Europe. Dinophysis often exhibit patchy distributions and sampling with conventional methods may fail to detect them. A 6-month calibration study in 2006, plus an additional sampling in 2010 were carried out in Galicia to compare Dinophysis counts obtained from weekly high vertical resolution bottle samples with depth-integrated hose samples. Counts with these two methods were comparable at some depth-ranges, but hose maxima were over one order of magnitude lower under thin-layer scenarios. Estimates from hose samplers should be used with caution in programmes using a “Dinophysis index”, either to trigger shellfish sampling or to establish precautionary harvesting closures. In general, hose samplers provide reliable information on the occurrence of Dinophysis except under extreme site-specific hydrodynamic conditions. This study adds new information about the heterogeneous, specific vertical distributions of two Dinophysis spp. | Sí
Show more [+] Less [-]Ragworm fatty acid profiles reveals habitat and trophic interactions with halophytes and with mercury Full text
2012
Lillebø, Ana Isabel | Cleary, Daniel Francis Richard | Marques, Bruna | Reis, Alberto | Lopes da Silva, Teresa | Calado, Ricardo
Ragworm fatty acid profiles reveals habitat and trophic interactions with halophytes and with mercury Full text
2012
Lillebø, Ana Isabel | Cleary, Daniel Francis Richard | Marques, Bruna | Reis, Alberto | Lopes da Silva, Teresa | Calado, Ricardo
The present study aimed to assess if ragworm fatty acids (FA) profiles could be used to discriminate their spatial distribution in an historically mercury-contaminated estuarine environment, i.e., if it was possible to differentiate ragworms present in salt marsh sediments surrounding plant roots and rhizomes (rhizosediment) from adjacent unvegetated sediment. Additionally, we also tried to determine if ragworms differed in mercury content and if these values could also be used to identify the habitat they occur in. Results show that, within the same area, ragworms can be distinguished using FA profiles and that in halophyte rhizosediment ragworms display more than twice the levels of alpha-linolenic acid (18:3n-3). The ratio cis-vaccenic/oleic acids (18:1n-7/18:ln-9) in ragworms suggests higher carnivory in unvegetated sediments. Our study indicates that ragworm FA profiles can be used to identify their habitat, their trophic interaction with halophytes and reveal a spatially contrasting feeding behaviour, which also reflects mercury accumulation.
Show more [+] Less [-]Ragworm fatty acid profiles reveals habitat and trophic interactions with halophytes and with mercury Full text
2012
Lillebø, Ana Isabel | Cleary, Daniel Francis Richard | Marques, Bruna | Reis, Alberto | Lopes da Silva, Teresa | Calado, Ricardo
The present study aimed to assess if ragworm fatty acids (FA) profiles could be used to discriminate their spatial distribution in an historically mercury-contaminated estuarine environment, i.e., if it was possible to differentiate ragworms present in salt marsh sediments surrounding plant roots and rhizomes (rhizosediment) from adjacent unvegetated sediment. Additionally, we also tried to determine if ragworms differed in mercury content and if these values could also be used to identify the habitat they occur in. Results show that, within the same area, ragworms can be distinguished using FA profiles and that in halophyte rhizosediment ragworms display more than twice the levels of alpha-linolenic acid (18:3n-3). The ratio cis-vaccenic/oleic acids (18:1n-7/18:ln-9) in ragworms suggests higher carnivory in unvegetated sediments. Our study indicates that ragworm FA profiles can be used to identify their habitat, their trophic interaction with halophytes and reveal a spatially contrasting feeding behaviour, which also reflects mercury accumulation. | published
Show more [+] Less [-]Evaluation of the partial renewal of in situ phytoplankton microcosms and application to the impact assessment of bentazon and dimethenamid Full text
2012
de la Broise, Denis | Stachowski-Haberkorn, Sabine
Evaluation of the partial renewal of in situ phytoplankton microcosms and application to the impact assessment of bentazon and dimethenamid Full text
2012
de la Broise, Denis | Stachowski-Haberkorn, Sabine
Microcosms, each consisting of 2L natural surface seawater maintained in 2.3-L glass bottles, were immersed at a depth of 6m. The renewal of 10% of microcosm volumes was carried out every other day. Phytoplankton-containing seawater was used for renewal (previously filtered through 25-, 50- or 200-μm cut-off). Phytoplankton community pigment analysis (by HPLC) and flow cytometry analysis were performed. After 13days, data exhibited phytoplankton characteristics in microcosms in the same range as that of the natural surrounding sea water over the same period. Furthermore, in these microcosms, a negative correlation was observed between the filtration cut-off used for renewal water, and the total cell count. Herbicides were tested as commercial mixtures at 1, 10 and 100μgL⁻¹ active substance. Both Frontier® (dimethenamid) and Basamais® (bentazon) induced significant modifications of the phytoplankton populations at every concentration tested. Such results suggest a possible disturbance in polluted coastal areas.
Show more [+] Less [-]Evaluation of the partial renewal of in situ phytoplankton microcosms and application to the impact assessment of bentazon and dimethenamid Full text
2012
De La Broise, Denis | Stachowski-haberkorn, Sabine
Microcosms, each consisting of 2 L natural surface seawater maintained in 2.3-L glass bottles, were immersed at a depth of 6 metres. The renewal of ten percent of microcosm volumes was carried out every other day. Phytoplankton-containing seawater was used for renewal (previously filtered through 25-, 50- or 200-μm cut-off). Phytoplankton community pigment analysis (by HPLC) and flow cytometry analysis were performed. After 13 days, data exhibited phytoplankton characteristics in microcosms in the same range as that of the natural surrounding sea water over the same period. Furthermore, in these microcosms, a negative correlation was observed between the filtration cut-off used for renewal water, and the eukaryote cell count. Herbicides were tested as commercial mixtures at 1, 10 and 100 μg.L-1 active principal. Both Frontier® (dimethenamid) and Basamais® (bentazon) induced significant modifications of the phytoplankton populations at every concentration tested. Such results suggest a possible disturbance in polluted coastal areas.
Show more [+] Less [-]Centennial records of lead contamination in northern Atlantic bivalves (Arctica islandica) Full text
2012
Krause-Nehring, Jacqueline | Brey, Thomas | Thorrold, Simon R.
Centennial records of lead contamination in northern Atlantic bivalves (Arctica islandica) Full text
2012
Krause-Nehring, Jacqueline | Brey, Thomas | Thorrold, Simon R.
In the study, we establish centennial records of anthropogenic lead pollution at different locations in the North Atlantic (Iceland, USA, and Europe) by means of lead deposited in shells of the long-lived bivalve Arctica islandica. Due to local oceanographic and geological conditions we conclude that the lead concentrations in the Icelandic shell reflect natural influxes of lead into Icelandic waters. In comparison, the lead profile of the US shell is clearly driven by anthropogenic lead emissions transported from the continent to the ocean by westerly surface winds. Lead concentrations in the European North Sea shell, in contrast, are dominantly driven by local lead sources resulting in a much less conspicuous 1970s gasoline lead peak. In conclusion, the lead profiles of the three shells are driven by different influxes of lead, and yet, all support the applicability of Pb/Ca analyses of A. islandica shells to reconstruct location specific anthropogenic lead pollution.
Show more [+] Less [-](Fig. 5.2) Profile of Lead/Calcium ratios of an Arctica islandica shell collected off the coast of Northeast Iceland Full text
2012
Krause-Nehring, Jacqueline | Brey, Thomas | Thorrold, Simon R
(Fig. 5.3) Profile of Lead/Calcium ratios of an Arctica islandica shell collected off the coast of Virginia, USA Full text
2012
Krause-Nehring, Jacqueline | Brey, Thomas | Thorrold, Simon R
Centennial records of lead contamination in northern Atlantic bivalves (Arctica islandica) Full text
2012
Krause-Nehring, Jacqueline | Brey, Thomas | Thorrold, Simon R.
In the study, we establish centennial records of anthropogenic lead pollution at different locations in the North Atlantic (Iceland, USA, and Europe) by means of lead deposited in shells of the long-lived bivalve Arctica islandica. Due to local oceanographic and geological conditions we conclude that the lead concentrations in the Icelandic shell reflect natural influxes of lead into Icelandic waters. In comparison, the lead profile of the US shell is clearly driven by anthropogenic lead emissions transported from the continent to the ocean by westerly surface winds. Lead concentrations in the European North Sea shell, in contrast, are dominantly driven by local lead sources resulting in a much less conspicuous 1970s gasoline lead peak. In conclusion, the lead profiles of the three shells are driven by different influxes of lead, and yet, all support the applicability of Pb/Ca analyses of A. islandica shells to reconstruct location specific anthropogenic lead pollution.
Show more [+] Less [-]Lead/Calcium profiles in the common time window 1770-2010 of the three Arctica islandica shells Full text
2012
Krause-Nehring, Jacqueline | Brey, Thomas | Thorrold, Simon R
In the study, we establish centennial records of anthropogenic lead pollution at different locations in the North Atlantic (Iceland, USA, and Europe) by means of lead deposited in shells of the long-lived bivalve Arctica islandica. Due to local oceanographic and geological conditions we conclude that the lead concentrations in the Icelandic shell reflect natural influxes of lead into Icelandic waters. In comparison, the lead profile of the US shell is clearly driven by anthropogenic lead emissions transported from the continent to the ocean by westerly surface winds. Lead concentrations in the European North Sea shell, in contrast, are dominantly driven by local lead sources resulting in a much less conspicuous 1970s gasoline lead peak. In conclusion, the lead profiles of the three shells are driven by different influxes of lead, and yet, all support the applicability of Pb/Ca analyses of A. islandica shells to reconstruct location specific anthropogenic lead pollution.
Show more [+] Less [-](Fig. 5.4) Profile of Lead/Calcium ratios of an Arctica islandica shell collected in the North Sea near Helgoland, Germany Full text
2012
Krause-Nehring, Jacqueline | Brey, Thomas | Thorrold, Simon R
Differential biomagnification of PCB, PBDE, Hg and Radiocesium in the food web of the European hake from the NW Mediterranean Full text
2012
Harmelin-Vivien, M. L. (Mireille L.) | Bodiguel, Xavier | Charmasson, Sabine | Loizeau, Véronique | Mellon-Duval, Capucine | Tronczyński, Jacek | Cossa, Daniel
Differential biomagnification of PCB, PBDE, Hg and Radiocesium in the food web of the European hake from the NW Mediterranean Full text
2012
Harmelin-Vivien, M. L. (Mireille L.) | Bodiguel, Xavier | Charmasson, Sabine | Loizeau, Véronique | Mellon-Duval, Capucine | Tronczyński, Jacek | Cossa, Daniel
Consumption of marine organisms represents one of the main exposure sources of contaminants for human populations. To obtain a global view of the contamination in commercial fish in the NW Mediterranean Sea, we analysed four types of priority contaminants (PCBs, PBDEs, Hg and ¹³⁷Cs) in the European hake, Merluccius merluccius, from the Gulf of Lions in relation with organism’s trophic level (δ¹⁵N). All contaminants presented a significant increase in concentration in hake muscle with trophic level. However, obvious differences between contaminants were evidenced. Biomagnification factors (BMF and FWMF) along the hake food web were higher for Hg and CB-153 than for BDE-47 and ¹³⁷Cs, and increase in contaminant concentration with trophic level occurred at different rates depending on contaminants. Such differences of biomagnification patterns can be related to physico-chemical properties of the different contaminants.
Show more [+] Less [-]Differential biomagnification of PCB, PBDE, Hg and Radiocesium in the food web of the European hake from the NW Mediterranean Full text
2012
Harmelin-vivien, Mireille | Bodiguel, Xavier | Charmasson, Sabine | Loizeau, Veronique | Mellon, Capucine | Tronczynski, Jacek | Cossa, Daniel
Consumption of marine organisms represents one of the main exposure sources of contaminants for human populations. To obtain a global view of the contamination in commercial fish in the NW Mediterranean Sea, we analysed four types of priority contaminants (PCBs, PBDEs, Hg and Cs-137) in the European hake, Merluccius merluccius, from the Gulf of Lions in relation with organism's trophic level (delta N-15). All contaminants presented a significant increase in concentration in hake muscle with trophic level. However, obvious differences between contaminants were evidenced. Biomagnification factors (BMF and FWMF) along the hake food web were higher for Hg and CB-153 than for BDE-47 and Cs-137, and increase in contaminant concentration with trophic level occurred at different rates depending on contaminants. Such differences of biomagnification patterns can be related to physico-chemical properties of the different contaminants. (C) 2012 Elsevier Ltd. All rights reserved.
Show more [+] Less [-]Water column characterisation on the Azores platform and at the sea mounts south of the archipelago Full text
2012
Palma, Carla | Lillebø, Ana I. | Borges, Carlos | Souto, Miguel | Pereira, Eduarda | Duarte, Armando C. | Abreu, Manuel Pinto de
Water column characterisation on the Azores platform and at the sea mounts south of the archipelago Full text
2012
Palma, Carla | Lillebø, Ana I. | Borges, Carlos | Souto, Miguel | Pereira, Eduarda | Duarte, Armando C. | Abreu, Manuel Pinto de
This study provides data concerning the hydrography and water chemistry of the Atlantic region between 29–38° N and 27–31° W, and establishes background values for dissolved Cu, Cd, Pb and As. Three water masses were identified: the Eastern North Atlantic Central Water (ENACW), the Mediterranean Water (MW) and the North Atlantic Deep Water (NADW). The ENACW exhibits a clear meridional gradient of temperature and salinity, with comparatively high values at the southern sites and lower values on the Azores platform. The ENACW, which includes the euphotic zone, also had comparatively high concentrations of oxygen and lower concentrations of nutrients and metals. The Cu, Cd and Pb results suggest that new background concentrations for OSPAR Region V (the Wider Atlantic) should be established as follows: 0.15–13nM for Cu, 0.05–1.4nM for Cd and 0.03–5nM for Pb. The background concentrations of As for OSPAR Region V should be 7–28nM.
Show more [+] Less [-]Water column characterisation on the Azores platform and at the sea mounts south of the archipelago Full text
2012
Palma, Carla | Lillebø, Ana I. | Borges, Carlos | Souto, Miguel | Pereira, Eduarda | Duarte, Armando C. | Abreu, Manuel Pinto de
This study provides data concerning the hydrography and water chemistry of the Atlantic region between 29-38° N and 27-31° W, and establishes background values for dissolved Cu, Cd, Pb and As. Three water masses were identified: the Eastern North Atlantic Central Water (ENACW), the Mediterranean Water (MW) and the North Atlantic Deep Water (NADW). The ENACW exhibits a clear meridional gradient of temperature and salinity, with comparatively high values at the southern sites and lower values on the Azores platform. The ENACW, which includes the euphotic zone, also had comparatively high concentrations of oxygen and lower concentrations of nutrients and metals. The Cu, Cd and Pb results suggest that new background concentrations for OSPAR Region V (the Wider Atlantic) should be established as follows: 0.15-13 nM for Cu, 0.05-1.4 nM for Cd and 0.03-5 nM for Pb. The background concentrations of As for OSPAR Region V should be 7-28 nM. | published
Show more [+] Less [-]The impact of coastal urbanization on the structure of phytobenthic communities in southern Brazil Full text
2012
Martins, Cintia D.L. | Arantes, Noele | Faveri, Caroline | Batista, Manuela B. | Oliveira, Eurico C. | Pagliosa, Paulo R. | Fonseca, Alessandra L. | Nunes, José Marcos C. | Chow, Fungyi | Pereira, Sonia B. | Horta, Paulo A.
The impact of coastal urbanization on the structure of phytobenthic communities in southern Brazil Full text
2012
Martins, Cintia D.L. | Arantes, Noele | Faveri, Caroline | Batista, Manuela B. | Oliveira, Eurico C. | Pagliosa, Paulo R. | Fonseca, Alessandra L. | Nunes, José Marcos C. | Chow, Fungyi | Pereira, Sonia B. | Horta, Paulo A.
The anthropogenic pressures on coastal areas represent important factors affecting local, regional, and even global patterns of distribution and abundance of benthic organisms. This report undertakes a comparative analysis of the community structure of rocky shore intertidal phytobenthos in both pristine like environments (PLE) and urbanized environments (UBE) in southern Brazil, characterizing variations on different spatial scales. Multivariate analysis of variance indicated that the PLE is characterized by a larger number of taxa and an increased occurrence of Rhodophyta species in relation to UBE. In contrast, UBE were dominated by opportunistic algae, such as Cladophora and Ulva spp. Significance tests further indicated higher species richness and Shannon–Wiener diversity on the PLE in relation to UBE. Here we provide data showing the magnitude of seaweed biodiversity loss and discuss direct and indirect consequences of unplanned urbanization on these communities.
Show more [+] Less [-]The impact of coastal urbanization on the structure of phytobenthic communities in southern Brazil | Marine Pollution Bulletin Full text
2012
Martins, Cintia D. L. | Arantes, Noele | Faveri, Caroline | Batista, Manuela B. | Oliveira, Eurico C. | Pagliosa, Paulo R. | Fonseca, Alessandra L. | Nunes, José Marcos de Castro | Chow, Fungyi | Pereira, Sônia Maria Barreto | Horta, Paulo A. | Martins, Cintia D. L. | Arantes, Noele | Faveri, Caroline | Batista, Manuela B. | Oliveira, Eurico C. | Pagliosa, Paulo R. | Fonseca, Alessandra L. | Nunes, José Marcos de Castro | Chow, Fungyi | Pereira, Sônia Maria Barreto | Horta, Paulo A.
Texto completo: acesso restrito. p. 772–778 | The anthropogenic pressures on coastal areas represent important factors affecting local, regional, and even global patterns of distribution and abundance of benthic organisms. This report undertakes a comparative analysis of the community structure of rocky shore intertidal phytobenthos in both pristine like environments (PLE) and urbanized environments (UBE) in southern Brazil, characterizing variations on different spatial scales. Multivariate analysis of variance indicated that the PLE is characterized by a larger number of taxa and an increased occurrence of Rhodophyta species in relation to UBE. In contrast, UBE were dominated by opportunistic algae, such as Cladophora and Ulva spp. Significance tests further indicated higher species richness and Shannon–Wiener diversity on the PLE in relation to UBE. Here we provide data showing the magnitude of seaweed biodiversity loss and discuss direct and indirect consequences of unplanned urbanization on these communities.
Show more [+] Less [-]Metazooplankton communities in the Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia): Spatiotemporal variations and trophic relationships Full text
2012
Pagano, Marc | Sagarra, Pascual-Boi | Champalbert, Gisèle | Bouvy, Marc | Dupuy, Christine | Thomas, Yoann | Charpy, Loïc
Metazooplankton communities in the Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia): Spatiotemporal variations and trophic relationships Full text
2012
Pagano, Marc | Sagarra, Pascual-Boi | Champalbert, Gisèle | Bouvy, Marc | Dupuy, Christine | Thomas, Yoann | Charpy, Loïc
Metazooplankton abundance, biomass (<80μm, 200–500μm and >500μm) and community structure in the Ahe atoll were studied together with their relationships with environmental factors (temperature, salinity, wind) and trophic factors (phytoplankton, bacteria, heterotrophic nanoflagellates (HNF) and ciliates) during three periods in 2008–2009. Meroplankton, mainly bivalve and gastropod larvae, was dominant. Holoplankton was dominated by copepods, the main species being Oithona spp., Paracalanus parvus, Clausocalanus spp., Corycaeus spp., Acartia fossae and Undinula vulgaris. The results suggest a clear wind influence on the structure and horizontal distribution of the zooplankton communities. The metazooplankton appeared to be controlled mainly by food resources, suggesting a bottom-up control. The low nanophytoplankton biomass in contrast to the high abundance of picophytoplankton, HNF and nano-particle grazers (mainly Oithona spp., Paracalanus and bivalve larvae) highlighted the importance of the microbial loop in the food web.
Show more [+] Less [-]Metazooplankton communities in the Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia): Spatiotemporal variations and trophic relationships Full text
2012
Pagano, Marc | Sagarra, Pascual-boi | Champalbert, Gisele | Bouvy, Marc | Dupuy, Christine | Thomas, Yoann | Charpy, Loic
Metazooplankton abundance, biomass (<80 mu m, 200-500 mu m and >500 mu m) and community structure in the Ahe atoll were studied together with their relationships with environmental factors (temperature, salinity, wind) and trophic factors (phytoplankton, bacteria, heterotrophic nanoflagellates (HNF) and ciliates) during three periods in 2008-2009. Meroplankton, mainly bivalve and gastropod larvae, was dominant. Holoplankton was dominated by copepods, the main species being Oithona spp., Paracalanus parvus, Clausocalanus spp., Corycaeus spp., Acartia fossae and Undinula vulgaris. The results suggest a clear wind influence on the structure and horizontal distribution of the zooplankton communities. The metazooplankton appeared to be controlled mainly by food resources, suggesting a bottom-up control. The low nanophytoplankton biomass in contrast to the high abundance of picophytoplankton, HNF and nano-particle grazers (mainly Oithona spp., Paracalanus and bivalve larvae) highlighted the importance of the microbial loop in the food web. (C) 2012 Elsevier Ltd. All rights reserved.
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