Angheluta Vadineanu - Academia.edu (original) (raw)
Papers by Angheluta Vadineanu
Ekologia, 2014
Vihervaara P.: Ecosystem services: a rapid assessment method tested at 35 sites of the LTER-Europ... more Vihervaara P.: Ecosystem services: a rapid assessment method tested at 35 sites of the LTER-Europe network. Ekológia (Bratislava), Vol. 33, No. 3, p. 217-231, 2014.
In order to support the emerging network of long-term ecological research (LTER) sites across Eur... more In order to support the emerging network of long-term ecological research (LTER) sites across Europe, the European Union has launched ALTER-Net, a network aiming at lasting integration of long-term socio-economic, ecological and biodiversity research. Due to its high population density and long history of human habitation, however, Europe’s ecosystems are generally intensively used. Social and natural drivers are so inextricably intertwined that the notion of ‘socio-ecological’ systems is appropriate. Traditional natural science-based approaches are insufficient to understand these integrated systems, as they cannot adequately capture their relevant socio-economic dimensions. This is particularly relevant because the EU launched ALTER-Net has an explicit aim to support sustainability, a goal that requires integration of socio-economic and ecological dimensions. As such, LTER is challenged to significantly expand its focus from ecological to socio-ecological systems, thus transforming itself from LTER to long-term socio-ecological research or LTSER. In order to support this transformation, this chapter explores several approaches for conceptualising socio-economic dimensions of LTSER. It discusses how the socio-economic metabolism approach can be combined with theories of complex adaptive systems to generate heuristic models of society–nature interaction which can then be used to integrate concepts from the social sciences. In particular, the chapter discusses possible contributions from the fields of ecological anthropology and ecological economics and shows how participatory approaches can be integrated with innovative agent-based modelling concepts to arrive at an integrated representation of socio-ecological systems that can help to support local communities to move towards sustainability.
The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (... more The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (DIN) was studied in the lower Danube river and in selected lakes situated in the wetland area of the Danube Delta. The differences Danube Delta in nutrient concentration in the river waters entering the delta and the delta in different sites (especially lakes) of the wetland area are considered to reflect retention in the system. The highest retention was found in periods of moderate and low water level when the surfaceto-volume ratio of the lakes was high. In these periods the in-lake concentration of TRP and DIN could be as low as 11 and 23% of the values found in the inflowing river.
Hydrobiologia, 2003
Transition towards hypertrophy has affected biodiversity and productivity of most aquatic and wet... more Transition towards hypertrophy has affected biodiversity and productivity of most aquatic and wetland systems in the Lower Danube Wetland System (LDWS) over the last two decades. The aquatic macrophytes have been deeply involved in ecosystem reorganization in these circumstances. Representative shallow lakes and channels located in the river floodplain and delta were studied in this period in terms of space
NATO Science for Peace and Security Series, 2008
Water is a limited resource in increasingly short supply. The ability of water-sheds to provide s... more Water is a limited resource in increasingly short supply. The ability of water-sheds to provide sufficient water quantity and quality is threatened in the face increasing population growth and human activities in the watershed. In the context of these threats, many governments and ...
International Journal of Salt Lake Research, 1997
The aim of this paper is to identify the general trend of changes and the basic requirements of t... more The aim of this paper is to identify the general trend of changes and the basic requirements of the most important lagoon system of the Black Sea, on the basis of critical analysis of existing data. A more coherent set of data sampled after 1988 on the basis of some intensive and extensive study and research programmes, including the main trophic parameters and the most representative structural and functional features of this complex of ecotonal lakes, is comparatively analysed together with more fragmentary data previously existing. The structural and functional changes within this complex of lakes were analysed based on 31 most representative variables belonging to the main abiotic and biological compartments of the two main lakes, Razim and Sinoe: dissolved organic carbon, dissolved oxygen, trophic state index TSI, nutrient content and ratio, salinity, chlorophyll, phytoplankton, zooplankton, submerged macrophytes, zoobenthos, fish and birds. Two stages were distinguished in the main structural changes, including morphometric connections with the Danube River and the Black Sea and hydrochemistry and its effects on communities. These transitions were associated with two main driving forces, water desalinisation and rapid eutrophication, and with other two kinds of man-induced changes, local hydrotechnical buildings and long-distance variables operating over the entire Danube River watershed. The information support system for sustainable management of the Razim-Sinoe Lagoon Complex as a part of the Danube Delta Biosphere Reserve, integrating existing data from research programmes and an integrated monitoring system for new data is a final conclusion on further needs.
NATO Science for Peace and Security Series, 2008
... Figure 3. Location of Romania within the international Danube River Basin. 119 ... by differe... more ... Figure 3. Location of Romania within the international Danube River Basin. 119 ... by different types of ecosystems is already managed as protected areas (eg National Parks-18 ... for testing the monitoring and classification procedures of water bodies quality and ecological integrity. ...
Long-Term Ecological Research, 2010
In order to support the emerging network of long-term ecological research (LTER) sites across Eur... more In order to support the emerging network of long-term ecological research (LTER) sites across Europe, the European Union has launched ALTER-Net, a network aiming at lasting integration of long-term socio-economic, ecological and biodiversity research. Due to its high population density and long history of human habitation, however, Europe's ecosystems are generally intensively used. Social and natural drivers are so inextricably intertwined that the notion of "socio-ecological" systems is appropriate. Traditional natural science-based approaches are insufficient to understand these integrated systems, as they cannot adequately capture their relevant socio-economic dimensions. This is particularly relevant because the EU launched ALTER-Net has an explicit aim to support sustainability, a goal that requires integration of socio-economic and ecological dimensions. As such, LTER is challenged to significantly expand its focus from ecological to socio-ecological systems, thus transforming itself from LTER to long-term socio-ecological research or LTSER. In order to support this transformation, this paper explores several approaches for conceptualizing socio-economic dimensions of LTSER. It discusses how the socio-economic metabolism approach can be combined with theories of complex adaptive systems to generate heuristic models of societynature interaction which can then be used to integrate concepts from the social sciences. In particular, the paper discusses possible contributions from the fields of ecological anthropology and ecological economics and shows how participatory approaches can be integrated with innovative agent-based modelling concepts to arrive at an integrated representation of socio-ecological systems that can help to support local communities to move towards sustainability.
Hydrobiologia, 2002
The Danube Delta is one of the widest wetland systems in Europe and Lake Isacova is one of the bi... more The Danube Delta is one of the widest wetland systems in Europe and Lake Isacova is one of the biggest lakes in the Delta. The oligochaete community in the Lake comprised 52% of the total benthic fauna and Potamothrix hammoniensis (Michaelsen, 1901) (Tubificidae, Oligochaeta) represented more than 90% of the oligochaetes sampled. During September 1991 – August 1994, the proportion
Hydrobiologia, 2000
Transition towards hypertrophy has affected biodiversity and productivity of most aquatic and wet... more Transition towards hypertrophy has affected biodiversity and productivity of most aquatic and wetland systems in the Lower Danube Wetland System (LDWS) over the last two decades. The aquatic macrophytes have been deeply involved in ecosystem reorganization in these circumstances. Representative shallow lakes and channels located in the river floodplain and delta were studied in this period in terms of space distribution, diversity, species composition, primary production and main hydrogeomorphic features (morphometrical and physico-chemical parameters). Changes in submerged vegetation dynamics along two successive decades after 1980 included diminishing areas of about 50% in the Danube Delta, restructuring primary producers by suppressing aquatic weed in some lakes or parts of lakes and decreasing species richness to few populations with upright and floating growth strategy. Biomass production showed different trends, from severe reduction in some lakes and periods to marked increase in other ones, provided by a changed and simplified species structure, generally dominated by Ceratophyllum demersum L. and Potamogeton species. It was concluded that the eutrophication effects are maintaining, modulated by diverse response mechanisms developed by submerged macrophytes. Finally, the main lessons to be learned for the management of aquatic macrophyte-dominated systems in the framework of redesigning the LDWS structures are emphasized on the basis of a large scale and long-term prospect of the Danube River and Black Sea Basins.
Hydrobiologia, 2000
Within the Danube River delta's lakes the Oligochaeta communities comprise between 7.9% and 36.2%... more Within the Danube River delta's lakes the Oligochaeta communities comprise between 7.9% and 36.2% of the total biomass of benthic fauna. Their importance in energy flow at the ecosystem level changed in relation to fast trophic transition of all shallow lakes to the hypertrophic state. The parameters of the energy budget of the dominant populations and the potential production of benthivorous fish species assessed during 1976-1994 interval support this conclusion. P/B ratio, K 1 and K 2 coefficients assessed for both the 1976-1980 and 1991-1994 intervals revealed different functional patterns of response of Potamothrix hammoniensis (Michaelsen, 1901) and Limnodrilus hoffmeisteri (Claparede, 1862) to varying trophic conditions. Changes in communities structure, size of the constituent populations and their age distribution, as well as the quantity and quality of food supply and level of hypoxia at the sediment/water interface were the main factors that affected the role of these populations as energy carrier from the huge energy pool represented by sedimented organic carbon to benthivorous fish species.
Hydrobiologia, 2006
Nitrogen and phosphorous exchange at the water-sediment interface is controlled both by complex p... more Nitrogen and phosphorous exchange at the water-sediment interface is controlled both by complex physico-chemical factors and biological processes. Zoobenthos excretion is one of the most important processes in the mineralization of sedimented organic mater. In polluted freshwaters, tubificid worms are among the dominant components of the benthic community. Rates of ammonium and inorganic phosphate excretion by tubificids were experimentally assessed. They were related to the tubificid abundance in a stream ecosystem polluted with municipal and industrial wastewater. The relationship between these rates and temperature were investigated within the range of 4-23°C. Relatively constant excretion rates were obtained for both nutrients in the first 8 h of excretion, ranging between 0.076 and 0.226 lg N mg d.w. )1 h )1 and 0.0065-0.01 lg P mg d.w. )1 h )1 , respectively. Q 10 values of 2.52 for ammonium and 1.31 for phosphate were calculated. If we presume that all excreta eventually enters the water column, then we can calculate that these invertebrates potentially add 39.17 mg N m )2 day )1 and 0.49 mg P m )2 day )1 . These values accounts for 17.16 and 7.56% of the nutrient load in the river water, respectively.
Hydrobiologia, 1994
... Sergiu Cristofor, Angheluta Vadineanu, Gheorghe Ignat & Constantin Ci... more ... Sergiu Cristofor, Angheluta Vadineanu, Gheorghe Ignat & Constantin Ciubuc Bucharest University, Ecological Research Center, Braila Hydrobiological Station, Ana Aslan ... values are in agreement with the wind intensity 3 on the Beaufort scale, mentioned by Weisser (1978) for ...
Hydrobiologia, 1993
The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (... more The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (DIN) was studied in the lower Danube river and in selected lakes situated in the wetland area of the Danube Delta. The differences Danube Delta in nutrient concentration in the river waters entering the delta and the delta in different sites (especially lakes) of the wetland area are considered to reflect retention in the system. The highest retention was found in periods of moderate and low water level when the surfaceto-volume ratio of the lakes was high. In these periods the in-lake concentration of TRP and DIN could be as low as 11 and 23% of the values found in the inflowing river.
Hydrobiologia, 1992
The dynamics are presented of the main primary producers in seven representative Danube Delta lak... more The dynamics are presented of the main primary producers in seven representative Danube Delta lakes. Generally, the primary productivity developed from the macrophyte-epiphyte complex towards the phytoplankton. Species changes occurred in the two main compartments with increasing relative abundance of colonial blue-green algae in the phytoplankton and in submerged macrophytes of species with a vertical growth strategy. These changes are
Hydrobiologia, 2004
Importance of tubificid populations on nitrogen cycle in two categories of shallow eutrophic lake... more Importance of tubificid populations on nitrogen cycle in two categories of shallow eutrophic lakes in the Danube Delta was quantitatively assessed for the 1992-1993 period. The structure of the primary producers in the studied lakes was used to discriminate between the two categories:(i) lakes dominated by macrophytes (A1) and (ii) lakes dominated by phytoplankton (A2). In both categories tubificid worms
Ecological Economics, 2009
Effective policies to slow the rate of anthropogenic biodiversity loss should reduce socioeconomi... more Effective policies to slow the rate of anthropogenic biodiversity loss should reduce socioeconomic pressures on biodiversity, either directly or by modifying their underlying socioeconomic driving forces. The design of such policies is currently hampered by the limited understanding of socioeconomic drivers of and pressures on biodiversity as well as by lacking data, indicators and models. In order to improve understanding of these issues we here propose a conceptual model of socioeconomic biodiversity drivers and pressures. The model is based on the drivers-pressures-impacts-states-responses (DPSIR) scheme and on the socioeconomic metabolism approach. The aim of the model is to guide research aimed at improving our understanding of socioeconomic biodiversity pressures and drivers and to serve as a basis for the development of formal, quantitative models in that field. Based on three European long-term socio-ecological research (LTSER) platforms, we analyze the model's applicability and suitability as well as data availability and research needs. These platforms are the Danube Delta Wetland System in Romania, the Doñana in Spain and the Eisenwurzen in
Ekologia, 2014
Vihervaara P.: Ecosystem services: a rapid assessment method tested at 35 sites of the LTER-Europ... more Vihervaara P.: Ecosystem services: a rapid assessment method tested at 35 sites of the LTER-Europe network. Ekológia (Bratislava), Vol. 33, No. 3, p. 217-231, 2014.
In order to support the emerging network of long-term ecological research (LTER) sites across Eur... more In order to support the emerging network of long-term ecological research (LTER) sites across Europe, the European Union has launched ALTER-Net, a network aiming at lasting integration of long-term socio-economic, ecological and biodiversity research. Due to its high population density and long history of human habitation, however, Europe’s ecosystems are generally intensively used. Social and natural drivers are so inextricably intertwined that the notion of ‘socio-ecological’ systems is appropriate. Traditional natural science-based approaches are insufficient to understand these integrated systems, as they cannot adequately capture their relevant socio-economic dimensions. This is particularly relevant because the EU launched ALTER-Net has an explicit aim to support sustainability, a goal that requires integration of socio-economic and ecological dimensions. As such, LTER is challenged to significantly expand its focus from ecological to socio-ecological systems, thus transforming itself from LTER to long-term socio-ecological research or LTSER. In order to support this transformation, this chapter explores several approaches for conceptualising socio-economic dimensions of LTSER. It discusses how the socio-economic metabolism approach can be combined with theories of complex adaptive systems to generate heuristic models of society–nature interaction which can then be used to integrate concepts from the social sciences. In particular, the chapter discusses possible contributions from the fields of ecological anthropology and ecological economics and shows how participatory approaches can be integrated with innovative agent-based modelling concepts to arrive at an integrated representation of socio-ecological systems that can help to support local communities to move towards sustainability.
The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (... more The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (DIN) was studied in the lower Danube river and in selected lakes situated in the wetland area of the Danube Delta. The differences Danube Delta in nutrient concentration in the river waters entering the delta and the delta in different sites (especially lakes) of the wetland area are considered to reflect retention in the system. The highest retention was found in periods of moderate and low water level when the surfaceto-volume ratio of the lakes was high. In these periods the in-lake concentration of TRP and DIN could be as low as 11 and 23% of the values found in the inflowing river.
Hydrobiologia, 2003
Transition towards hypertrophy has affected biodiversity and productivity of most aquatic and wet... more Transition towards hypertrophy has affected biodiversity and productivity of most aquatic and wetland systems in the Lower Danube Wetland System (LDWS) over the last two decades. The aquatic macrophytes have been deeply involved in ecosystem reorganization in these circumstances. Representative shallow lakes and channels located in the river floodplain and delta were studied in this period in terms of space
NATO Science for Peace and Security Series, 2008
Water is a limited resource in increasingly short supply. The ability of water-sheds to provide s... more Water is a limited resource in increasingly short supply. The ability of water-sheds to provide sufficient water quantity and quality is threatened in the face increasing population growth and human activities in the watershed. In the context of these threats, many governments and ...
International Journal of Salt Lake Research, 1997
The aim of this paper is to identify the general trend of changes and the basic requirements of t... more The aim of this paper is to identify the general trend of changes and the basic requirements of the most important lagoon system of the Black Sea, on the basis of critical analysis of existing data. A more coherent set of data sampled after 1988 on the basis of some intensive and extensive study and research programmes, including the main trophic parameters and the most representative structural and functional features of this complex of ecotonal lakes, is comparatively analysed together with more fragmentary data previously existing. The structural and functional changes within this complex of lakes were analysed based on 31 most representative variables belonging to the main abiotic and biological compartments of the two main lakes, Razim and Sinoe: dissolved organic carbon, dissolved oxygen, trophic state index TSI, nutrient content and ratio, salinity, chlorophyll, phytoplankton, zooplankton, submerged macrophytes, zoobenthos, fish and birds. Two stages were distinguished in the main structural changes, including morphometric connections with the Danube River and the Black Sea and hydrochemistry and its effects on communities. These transitions were associated with two main driving forces, water desalinisation and rapid eutrophication, and with other two kinds of man-induced changes, local hydrotechnical buildings and long-distance variables operating over the entire Danube River watershed. The information support system for sustainable management of the Razim-Sinoe Lagoon Complex as a part of the Danube Delta Biosphere Reserve, integrating existing data from research programmes and an integrated monitoring system for new data is a final conclusion on further needs.
NATO Science for Peace and Security Series, 2008
... Figure 3. Location of Romania within the international Danube River Basin. 119 ... by differe... more ... Figure 3. Location of Romania within the international Danube River Basin. 119 ... by different types of ecosystems is already managed as protected areas (eg National Parks-18 ... for testing the monitoring and classification procedures of water bodies quality and ecological integrity. ...
Long-Term Ecological Research, 2010
In order to support the emerging network of long-term ecological research (LTER) sites across Eur... more In order to support the emerging network of long-term ecological research (LTER) sites across Europe, the European Union has launched ALTER-Net, a network aiming at lasting integration of long-term socio-economic, ecological and biodiversity research. Due to its high population density and long history of human habitation, however, Europe's ecosystems are generally intensively used. Social and natural drivers are so inextricably intertwined that the notion of "socio-ecological" systems is appropriate. Traditional natural science-based approaches are insufficient to understand these integrated systems, as they cannot adequately capture their relevant socio-economic dimensions. This is particularly relevant because the EU launched ALTER-Net has an explicit aim to support sustainability, a goal that requires integration of socio-economic and ecological dimensions. As such, LTER is challenged to significantly expand its focus from ecological to socio-ecological systems, thus transforming itself from LTER to long-term socio-ecological research or LTSER. In order to support this transformation, this paper explores several approaches for conceptualizing socio-economic dimensions of LTSER. It discusses how the socio-economic metabolism approach can be combined with theories of complex adaptive systems to generate heuristic models of societynature interaction which can then be used to integrate concepts from the social sciences. In particular, the paper discusses possible contributions from the fields of ecological anthropology and ecological economics and shows how participatory approaches can be integrated with innovative agent-based modelling concepts to arrive at an integrated representation of socio-ecological systems that can help to support local communities to move towards sustainability.
Hydrobiologia, 2002
The Danube Delta is one of the widest wetland systems in Europe and Lake Isacova is one of the bi... more The Danube Delta is one of the widest wetland systems in Europe and Lake Isacova is one of the biggest lakes in the Delta. The oligochaete community in the Lake comprised 52% of the total benthic fauna and Potamothrix hammoniensis (Michaelsen, 1901) (Tubificidae, Oligochaeta) represented more than 90% of the oligochaetes sampled. During September 1991 – August 1994, the proportion
Hydrobiologia, 2000
Transition towards hypertrophy has affected biodiversity and productivity of most aquatic and wet... more Transition towards hypertrophy has affected biodiversity and productivity of most aquatic and wetland systems in the Lower Danube Wetland System (LDWS) over the last two decades. The aquatic macrophytes have been deeply involved in ecosystem reorganization in these circumstances. Representative shallow lakes and channels located in the river floodplain and delta were studied in this period in terms of space distribution, diversity, species composition, primary production and main hydrogeomorphic features (morphometrical and physico-chemical parameters). Changes in submerged vegetation dynamics along two successive decades after 1980 included diminishing areas of about 50% in the Danube Delta, restructuring primary producers by suppressing aquatic weed in some lakes or parts of lakes and decreasing species richness to few populations with upright and floating growth strategy. Biomass production showed different trends, from severe reduction in some lakes and periods to marked increase in other ones, provided by a changed and simplified species structure, generally dominated by Ceratophyllum demersum L. and Potamogeton species. It was concluded that the eutrophication effects are maintaining, modulated by diverse response mechanisms developed by submerged macrophytes. Finally, the main lessons to be learned for the management of aquatic macrophyte-dominated systems in the framework of redesigning the LDWS structures are emphasized on the basis of a large scale and long-term prospect of the Danube River and Black Sea Basins.
Hydrobiologia, 2000
Within the Danube River delta's lakes the Oligochaeta communities comprise between 7.9% and 36.2%... more Within the Danube River delta's lakes the Oligochaeta communities comprise between 7.9% and 36.2% of the total biomass of benthic fauna. Their importance in energy flow at the ecosystem level changed in relation to fast trophic transition of all shallow lakes to the hypertrophic state. The parameters of the energy budget of the dominant populations and the potential production of benthivorous fish species assessed during 1976-1994 interval support this conclusion. P/B ratio, K 1 and K 2 coefficients assessed for both the 1976-1980 and 1991-1994 intervals revealed different functional patterns of response of Potamothrix hammoniensis (Michaelsen, 1901) and Limnodrilus hoffmeisteri (Claparede, 1862) to varying trophic conditions. Changes in communities structure, size of the constituent populations and their age distribution, as well as the quantity and quality of food supply and level of hypoxia at the sediment/water interface were the main factors that affected the role of these populations as energy carrier from the huge energy pool represented by sedimented organic carbon to benthivorous fish species.
Hydrobiologia, 2006
Nitrogen and phosphorous exchange at the water-sediment interface is controlled both by complex p... more Nitrogen and phosphorous exchange at the water-sediment interface is controlled both by complex physico-chemical factors and biological processes. Zoobenthos excretion is one of the most important processes in the mineralization of sedimented organic mater. In polluted freshwaters, tubificid worms are among the dominant components of the benthic community. Rates of ammonium and inorganic phosphate excretion by tubificids were experimentally assessed. They were related to the tubificid abundance in a stream ecosystem polluted with municipal and industrial wastewater. The relationship between these rates and temperature were investigated within the range of 4-23°C. Relatively constant excretion rates were obtained for both nutrients in the first 8 h of excretion, ranging between 0.076 and 0.226 lg N mg d.w. )1 h )1 and 0.0065-0.01 lg P mg d.w. )1 h )1 , respectively. Q 10 values of 2.52 for ammonium and 1.31 for phosphate were calculated. If we presume that all excreta eventually enters the water column, then we can calculate that these invertebrates potentially add 39.17 mg N m )2 day )1 and 0.49 mg P m )2 day )1 . These values accounts for 17.16 and 7.56% of the nutrient load in the river water, respectively.
Hydrobiologia, 1994
... Sergiu Cristofor, Angheluta Vadineanu, Gheorghe Ignat & Constantin Ci... more ... Sergiu Cristofor, Angheluta Vadineanu, Gheorghe Ignat & Constantin Ciubuc Bucharest University, Ecological Research Center, Braila Hydrobiological Station, Ana Aslan ... values are in agreement with the wind intensity 3 on the Beaufort scale, mentioned by Weisser (1978) for ...
Hydrobiologia, 1993
The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (... more The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (DIN) was studied in the lower Danube river and in selected lakes situated in the wetland area of the Danube Delta. The differences Danube Delta in nutrient concentration in the river waters entering the delta and the delta in different sites (especially lakes) of the wetland area are considered to reflect retention in the system. The highest retention was found in periods of moderate and low water level when the surfaceto-volume ratio of the lakes was high. In these periods the in-lake concentration of TRP and DIN could be as low as 11 and 23% of the values found in the inflowing river.
Hydrobiologia, 1992
The dynamics are presented of the main primary producers in seven representative Danube Delta lak... more The dynamics are presented of the main primary producers in seven representative Danube Delta lakes. Generally, the primary productivity developed from the macrophyte-epiphyte complex towards the phytoplankton. Species changes occurred in the two main compartments with increasing relative abundance of colonial blue-green algae in the phytoplankton and in submerged macrophytes of species with a vertical growth strategy. These changes are
Hydrobiologia, 2004
Importance of tubificid populations on nitrogen cycle in two categories of shallow eutrophic lake... more Importance of tubificid populations on nitrogen cycle in two categories of shallow eutrophic lakes in the Danube Delta was quantitatively assessed for the 1992-1993 period. The structure of the primary producers in the studied lakes was used to discriminate between the two categories:(i) lakes dominated by macrophytes (A1) and (ii) lakes dominated by phytoplankton (A2). In both categories tubificid worms
Ecological Economics, 2009
Effective policies to slow the rate of anthropogenic biodiversity loss should reduce socioeconomi... more Effective policies to slow the rate of anthropogenic biodiversity loss should reduce socioeconomic pressures on biodiversity, either directly or by modifying their underlying socioeconomic driving forces. The design of such policies is currently hampered by the limited understanding of socioeconomic drivers of and pressures on biodiversity as well as by lacking data, indicators and models. In order to improve understanding of these issues we here propose a conceptual model of socioeconomic biodiversity drivers and pressures. The model is based on the drivers-pressures-impacts-states-responses (DPSIR) scheme and on the socioeconomic metabolism approach. The aim of the model is to guide research aimed at improving our understanding of socioeconomic biodiversity pressures and drivers and to serve as a basis for the development of formal, quantitative models in that field. Based on three European long-term socio-ecological research (LTSER) platforms, we analyze the model's applicability and suitability as well as data availability and research needs. These platforms are the Danube Delta Wetland System in Romania, the Doñana in Spain and the Eisenwurzen in