خيارات البحث
النتائج 3101 - 3110 من 62,508
Contribution to the knowledge of bioindicator properties of red algae (Rhodophyta) in the rivers of Serbia [Yugoslavia]
1998
Simic, S. | Rankovic, B. (Prirodno-matematicki fakultet, Kragujevac (Yugoslavia). Institut za biologiju)
Various physical, chemical and biological methods are used in complex investigations which are aimed at determining the quality of water. One of the oldest but also most widely accepted biological mathods is determination of saprobity on the basis of bioindicators. In application of these methods the existing lists of the indicators are most frequently used (Sladacek 1973, SEV 1977). In these lists only nine types of red algae (Rhodophyta) are specified as indicators of water quality. One of the main trends in development of algaeology in Serbia (Yugoslavia) is investigation of autoecological properties of algae and making a list of water quality indicator algae suited to the specific ecological conditions in water ecosystems of Serbia (Yugoslavia). The objective of this paper is to present information about apperance of red algae in the rivers of Serbia (Yugoslavia) and influence of physico-chemical factors upon their development, which represents a contribution to making of the above mentioned list of the water quality indicator algae.
اظهر المزيد [+] اقل [-]Spatial and temporal dynamics of cellulolytic microorganisms in Vlasina [water] reservoir [Serbia, Yugoslavia]
1998
Comic, Lj. | Curcic, S. | Rankovic, B. (Prirodno-matematicki fakultet, Kragujevac (Yugoslavia). Institut za biologiju)
Processes of transformation of organic matter are slowed down so that cellulose which originates from cell walls of Sphagnum is retained long in unchanged form. The highest valises of cellulolytic bacteria (0.33-126.67 bact/ml) were recorded in October. In most cases slightly active species were found, Cellvibrio fulvus was dominant. The participation of fungi in cellulolytic community was significant 23-31.5.
اظهر المزيد [+] اقل [-]The successions of plankton communities in Grosanica [water] reservoirs [Serbia, Yugoslavia]
1998
Comic, Lj. (Prirodno-matematicki fakultet, Novi Sad (Yugoslavia). Institut za biologiju) | Ostojic, A. | Milosevic, S. | Rankovic, B. | Simic, V. | Timotijevic, V. | Brdar, A.
Within the comprehensive hydrobiological investigation of Grosnica water reservoir (Serbia, Yugoslavia) composition and dynamics of bacterioplankton, phytoplankton and zooplankton, as well as their seasonal successions were studied. The composition of plankton communities varies during the vegetation period in the function of the physicochemical features. Grosnica water reservoir with its microbial features belongs to the 1st-2nd class of bonity according to Kohl. The highest values pf bacterio- and zooplankton were recorded in August, while bruto primary production in September.
اظهر المزيد [+] اقل [-]A contribution to the improvement of a model for computation of thermic capacity of a water course
1998
Canic, K. (Savezni hidrometeoroloski zavod, Beograd (Yugoslavia))
The paper presents one of the methods for calculation of temperature of a water course, downstream of the relase of a thermo-electric power-plant, taking into consideration the well-known temperatures and discharge values of the tributaries under different meteorological conditions. In view of the importance of temperature regime for the water eco-system, understanding the influence of the power plants on thermic capacity of the water course, is essential in design and use of the power plant. The author's intention is to help towards improving computer models for the computation of a water course thermic capacity. To this end a model developed at the Institute for Meteorology and Water Management in Poland and applied in many coutries has been presented.
اظهر المزيد [+] اقل [-]Impact of cage carp culture on zooplankton and benthos
1998
Miljanovic, B. (Prirodno-matematicki fakultet, Novi Sad (Yugoslavia). Institut za biologiju) | Pujin, V. | Stojkovic, S. | Maletin, S. | Ivanc, A.
During the 1996-1997 period, dynamics and structure of zooplankton and benthos in sugar mill canal in Crvenka (Serbia, Yugoslavia) were studied. Two representative sampling sites were chosen, while the third one served as a control site, providing it has no impact on cage culture. The canal section where the cages were established, had previously been drainage and dredged. Immediately after the refilling, the zooplankton qualitative structure was scarce, with dominating Rotatoria. Two months later, the situation improved and Cladocera and Copepoda emerged. Those two groups of organisms have the major role in enhancing the commercial feed consumption Soon after the refilling, the benthos was reestablished. Sample analysis shows the presence of Oligochaeta and Chironomidae. Qualitative and quantitative analysis of benthos points out no significant difference between the canal sections upstream and downstream the cage culture.
اظهر المزيد [+] اقل [-]Water quality modeling and controlled successions of ichthyofauna
1998
Djordjevic, B. | Milanovic, T. (Univerzitet u Beogradu, Beograd (Yugoslavia). Gradjevinski fakultet)
Mathematical modles and adequate investigation works enables successful water quality modeling. These models includes all relevant abiotic components (concentration of dissolved oxygen, temperature regimes and temperature stratification, concentration of organic and inorganic components of physical-chemical water conditions), while the biotic components are present only with phyto- and zooplankton. In new water reservoir, ichthyofauna mostly undergo mancontrolled successions, starting with planned stocking a water reservoir with fish. The paper presents analytical approach for mathematical modeling of ichthyofauna and application of Lotka - Volterr's equations.
اظهر المزيد [+] اقل [-]Eutrophisation, pollution nutritionnelle et restauration des lacs النص الكامل
1980
Barroin, G. | Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) ; Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) | P. Pesson (Editeur)
ISBN 2-04-011156-5 63 ref. | National audience
اظهر المزيد [+] اقل [-]13C assimilation as well as functional gene abundance and expression elucidate the biodegradation of glyphosate in a field experiment النص الكامل
2022
Wirsching, Johannes | Wimmer, Benedikt | Ditterich, Franziska | Schlögl, Johanna | Martin-Laurent, Fabrice | Huhn,, Carolin | Haderlein, Stefan, B. | Kandeler, Ellen | Poll, Christian | University of Stuttgart, Germany | Eberhard Karls University of Tübingen, Department of Prehistory and Quaternary Ecology, Schloss Hohentübingen, 72070 Tübingen, Germany ; Eberhard Karls Universität Tübingen = University of Tübingen | Agroécologie [Dijon] ; Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Dijon ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | This study was financially supported by the German ResearchFoundation (DFG) under the Collaborative Research Center 1253CAMPOS (DFG grant SFB 1253/1 2017).
13C assimilation as well as functional gene abundance and expression elucidate the biodegradation of glyphosate in a field experiment النص الكامل
2022
Wirsching, Johannes | Wimmer, Benedikt | Ditterich, Franziska | Schlögl, Johanna | Martin-Laurent, Fabrice | Huhn,, Carolin | Haderlein, Stefan, B. | Kandeler, Ellen | Poll, Christian | University of Stuttgart, Germany | Eberhard Karls University of Tübingen, Department of Prehistory and Quaternary Ecology, Schloss Hohentübingen, 72070 Tübingen, Germany ; Eberhard Karls Universität Tübingen = University of Tübingen | Agroécologie [Dijon] ; Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Dijon ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | This study was financially supported by the German ResearchFoundation (DFG) under the Collaborative Research Center 1253CAMPOS (DFG grant SFB 1253/1 2017).
International audience | Glyphosate (N-phosphonomethylglycine; GLP) and its main metabolite AMPA (aminomethylphosphonic acid), are frequently detected in relatively high concentrations in European agricultural topsoils. Glyphosate has a high sorption affinity, yet it can be detected occasionally in groundwater. We hypothesized that shrinkage cracks occurring after dry periods could facilitate GLP transport to greater depths where subsoil conditions slow further microbial degradation. To test this hypothesis, we simulated a heavy rainfall event (HRE) on a clay-rich arable soil. We applied 2.1 kg ha−1 of 100% 13C3, 15N-labeled GLP one day before the simulated rainfall event. Microbial degradation of translocated GLP over a 21-day period was assessed by quantifying 13C incorporation into phospholipid fatty acids. Microbial degradation potential and activity were determined by quantifying the abundance and expression of functional genes involved in the two known degradation pathways of GLP; to AMPA (goxA) or sarcosine (sarc). We confirmed that goxA transcripts were elevated in the range of 4.23 x 105 copy numbers g−1 soil only one day after application. The increase in AMPA associated with a rise in goxA transcripts and goxA-harboring microorganisms indicated that the degradation pathway to AMPA dominated. Based on 13C-enrichment 3 h after the HRE, fungi appeared to initiate glyphosate degradation. At later time points, Gram+-bacteria proved to be the main degraders due to their higher 13C-incorporation. Once GLP reached the subsoil, degradation continued but more slowly. By comparing GLP distribution and its microbial degradation in macropores and in the bulk soil, we demonstrated different time- and depth-dependent GLP degradation dynamics in macropores. This indicates the need for field studies in which soil properties relevant to GLP degradation are related to limiting environmental conditions, providing a realistic assessment of GLP fate in soils.
اظهر المزيد [+] اقل [-]13C assimilation as well as functional gene abundance and expression elucidate the biodegradation of glyphosate in a field experiment النص الكامل
2022
Wirsching, Johannes | Wimmer, Benedikt | Ditterich, Franziska | Schlögl, Johanna | Martin-Laurent, Fabrice | Huhn, Carolin | Haderlein, Stefan | Kandeler, Ellen | Poll, Christian
Glyphosate (N-phosphonomethylglycine; GLP) and its main metabolite AMPA (aminomethylphosphonic acid), are frequently detected in relatively high concentrations in European agricultural topsoils. Glyphosate has a high sorption affinity, yet it can be detected occasionally in groundwater. We hypothesized that shrinkage cracks occurring after dry periods could facilitate GLP transport to greater depths where subsoil conditions slow further microbial degradation. To test this hypothesis, we simulated a heavy rainfall event (HRE) on a clay-rich arable soil. We applied 2.1 kg ha⁻¹ of 100% ¹³C₃, ¹⁵N-labeled GLP one day before the simulated rainfall event. Microbial degradation of translocated GLP over a 21-day period was assessed by quantifying ¹³C incorporation into phospholipid fatty acids. Microbial degradation potential and activity were determined by quantifying the abundance and expression of functional genes involved in the two known degradation pathways of GLP; to AMPA (goxA) or sarcosine (sarc). We confirmed that goxA transcripts were elevated in the range of 4.23 x 10⁵ copy numbers g⁻¹ soil only one day after application. The increase in AMPA associated with a rise in goxA transcripts and goxA-harboring microorganisms indicated that the degradation pathway to AMPA dominated. Based on ¹³C-enrichment 3 h after the HRE, fungi appeared to initiate glyphosate degradation. At later time points, Gram⁺-bacteria proved to be the main degraders due to their higher ¹³C-incorporation. Once GLP reached the subsoil, degradation continued but more slowly. By comparing GLP distribution and its microbial degradation in macropores and in the bulk soil, we demonstrated different time- and depth-dependent GLP degradation dynamics in macropores. This indicates the need for field studies in which soil properties relevant to GLP degradation are related to limiting environmental conditions, providing a realistic assessment of GLP fate in soils.
اظهر المزيد [+] اقل [-]Drivers of litter ingestion by sea turtles: three decades of empirical data collected in Atlantic Europe and the Mediterranean النص الكامل
2022
Darmon, Gaëlle | Schulz, Marcus | Matiddi, Marco | Loza, Ana Liria | Tomás, Jesús | Camedda, Andrea | Chaieb, Olfa | El Hili, Hedia | Bradai, Mohamed | Bray, Laura | Claro, Françoise | Dellinger, Thomas | Dell'Amico, Florence | de Lucia, Giuseppe | Duncan, Emily | Gambaiani, Delphine | Godley, Brendan | Kaberi, Helen | Kaska, Yakup | Martin, Jessica | Moreira, Cláudia | Ostiategui, Patricia | Pham, Christopher | Piermarini, Raffaella | Revuelta, Ohiana | Rodríguez, Yasmina | Silvestri, Cecilia | Snape, Robin | Sozbilen, Dogăn | Tsangaris, Catherine | Vale, Maria | Vandeperre, Frederic | Miaud, Claude | Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) ; Université Paul-Valéry - Montpellier 3 (UPVM)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM) | Patrimoine naturel (PatriNat) ; Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-OFB Direction surveillance, évaluation,données (OFB - DSUED) ; Office français de la biodiversité (OFB)-Office français de la biodiversité (OFB)
International audience | Sea turtles are considered as bio-indicators for monitoring the efficiency of restoration measures to reduce marine litter impacts on health. However, the lack of extended and standardised empirical data has prevented the accurate analysis of the factors influencing litter ingestion and the relationships with individual health. Historic data collected from 1988 and standard data collected from 2016 were harmonised to enable such analyses on necropsied loggerhead turtles (Caretta caretta) in eight Mediterranean and North-East Atlantic countries. Litter was found in 69.24 % of the 1121 individuals, mostly single-use and fishing-related plastics. Spatial location, sex and life history stage explained a minor part of litter ingestion. While no relationships with health could be detected, indicating that all individuals can be integrated as bio-indicators, the mechanistic models published in literature suggest that the high proportion of plastics in the digestive contents (38.77 % per individual) could have long-term repercussions on population dynamics.
اظهر المزيد [+] اقل [-]Habitat selection by marine larvae in changing chemical environments النص الكامل
2017
Lecchini, D. | Dixson, D.L. | Lecellier, G. | Roux, N. | Frédérich, B. | Besson, M. | Tanaka, Y. | Banaigs, B. | Nakamura, Y. | Centre de recherches insulaires et observatoire de l'environnement (CRIOBE) ; Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) | Laboratoire d'Excellence CORAIL (LabEX CORAIL) ; Institut de Recherche pour le Développement (IRD)-Université des Antilles et de la Guyane (UAG)-École des hautes études en sciences sociales (EHESS)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de La Réunion (UR)-Université de la Polynésie Française (UPF)-Université de la Nouvelle-Calédonie (UNC)-Institut d'écologie et environnement-Université des Antilles (UA) | School of Marine Science and Policy ; University of Delaware [Newark] | Biologie intégrative des organismes marins (BIOM) ; Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) ; Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) | Laboratoire de Morphologie Fonctionnelle et Evolutive ; Université de Liège = University of Liège = Universiteit van Luik = Universität Lüttich (ULiège) | Institut de Génomique Fonctionnelle de Lyon (IGFL) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | sesoko station ; University of the Ryukyus [Okinawa] | Graduate School of Kuroshio Science ; Kochi University | ANR-10-LABX-0008,CORAIL,Coral reefs facing global change(2010)
Habitat selection by marine larvae in changing chemical environments النص الكامل
2017
Lecchini, D. | Dixson, D.L. | Lecellier, G. | Roux, N. | Frédérich, B. | Besson, M. | Tanaka, Y. | Banaigs, B. | Nakamura, Y. | Centre de recherches insulaires et observatoire de l'environnement (CRIOBE) ; Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) | Laboratoire d'Excellence CORAIL (LabEX CORAIL) ; Institut de Recherche pour le Développement (IRD)-Université des Antilles et de la Guyane (UAG)-École des hautes études en sciences sociales (EHESS)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de La Réunion (UR)-Université de la Polynésie Française (UPF)-Université de la Nouvelle-Calédonie (UNC)-Institut d'écologie et environnement-Université des Antilles (UA) | School of Marine Science and Policy ; University of Delaware [Newark] | Biologie intégrative des organismes marins (BIOM) ; Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) ; Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) | Laboratoire de Morphologie Fonctionnelle et Evolutive ; Université de Liège = University of Liège = Universiteit van Luik = Universität Lüttich (ULiège) | Institut de Génomique Fonctionnelle de Lyon (IGFL) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | sesoko station ; University of the Ryukyus [Okinawa] | Graduate School of Kuroshio Science ; Kochi University | ANR-10-LABX-0008,CORAIL,Coral reefs facing global change(2010)
International audience | The replenishment and persistence of marine species is contingent on dispersing larvae locating suitable habitat and surviving to a reproductive stage. Pelagic larvae rely on environmental cues to make behavioural decisions with chemical information being important for habitat selection at settlement. We explored the sensory world of crustaceans and fishes focusing on the impact anthropogenic alterations (ocean acidification, red soil, pesticide) have on conspecific chemical signals used by larvae for habitat selection. Crustacean (Stenopus hispidus) and fish (Chromis viridis) larvae recognized their conspecifics via chemical signals under control conditions. In the presence of acidified water, red soil or pesticide, the ability of larvae to chemically recognize conspecific cues was altered. Our study highlights that recruitment potential on coral reefs may decrease due to anthropogenic stressors. If so, populations of fishes and crustaceans will continue their rapid decline; larval recruitment will not replace and sustain the adult populations on degraded reefs.
اظهر المزيد [+] اقل [-]Habitat selection by marine larvae in changing chemical environments النص الكامل
2017
Lecchini, D. | Dixson, D.L. | Lecellier, G. | Roux, N. | Frédérich, B. | Besson, M. | Tanaka, Y. | Banaigs, B. | Nakamura, Y.
The replenishment and persistence of marine species is contingent on dispersing larvae locating suitable habitat and surviving to a reproductive stage. Pelagic larvae rely on environmental cues to make behavioural decisions with chemical information being important for habitat selection at settlement. We explored the sensory world of crustaceans and fishes focusing on the impact anthropogenic alterations (ocean acidification, red soil, pesticide) have on conspecific chemical signals used by larvae for habitat selection. Crustacean (Stenopus hispidus) and fish (Chromis viridis) larvae recognized their conspecifics via chemical signals under control conditions. In the presence of acidified water, red soil or pesticide, the ability of larvae to chemically recognize conspecific cues was altered. Our study highlights that recruitment potential on coral reefs may decrease due to anthropogenic stressors. If so, populations of fishes and crustaceans will continue their rapid decline; larval recruitment will not replace and sustain the adult populations on degraded reefs.
اظهر المزيد [+] اقل [-]Habitat selection by marine larvae in changing chemical environments النص الكامل
2017
Lecchini, David | Dixson, Danielle L. | Lecellier, Gael | Roux, Natacha | Frederich, Bruno | Besson, Marc | Tanaka, Y. | Banaigs, Bernard | Nakamura, Yohei | AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
peer reviewed | The replenishment and persistence of marine species is contingent on dispersing larvae locating suitable habitat and surviving to a reproductive stage. Pelagic larvae rely on environmental cues to make behavioural decisions with chemical information being important for habitat selection at settlement. We explored the sensory world of crustaceans and fishes focusing on the impact anthropogenic alterations (ocean acidification, red soil, pesticide) have on conspecific chemical signals used by larvae for habitat selection. Crustacean (Stenopus hispidus) and fish (Chromis viridis) larvae recognized their conspecifics via chemical signals under control conditions. In the presence of acidified water, red soil or pesticide, the ability of larvae to chemically recognize conspecific cues was altered. Our study highlights that recruitment potential on coral reefs may decrease due to anthropogenic stressors. If so, populations of fishes and crustaceans will continue their rapid decline; larval recruitment will not replace and sustain the adult populations on degraded reefs.
اظهر المزيد [+] اقل [-]