Health of the aquatic ecosystem

Aquatic macrophytes are one of the key components of freshwater ecosystems and contribute to ecosystem functioning and environmental sustainability. They are assumed to be an ideal biomonitoring tool in long-term monitoring programs implemented by the EU Water Framework Directive due to their sensitivity to environmental factors. Therefore, this study focuses on the evaluation of the ecological status in Lake Sapanca using macrophyte composition and abundance in order to make future predictions on the health of aquatic ecosystems and to form effective management.

11p tudichquannguyet 29-11-2021 9 1   Download

Present investigation deals with the fish faunal diversity in different habitat types in Hooghly district. Three types of floodplain water bodies were studied such as river, canal and ponds to determine the distribution of different fish species during different seasons. Results exhibit presence of 87 species in river Hooghly, 57 species in inland water and 47 species in different canals.

7p nguaconbaynhay8 13-10-2020 8 0   Download

Anthropogenic activities such as industrial production, mining, agriculture and transportation are among the main causes for the increase of trace metal concentrations in the environment, especially in water bodies. In this study, we evaluated the chronic impacts of lead (Pb) and arsenic (As) on Daphnia magna, a crucial organism to aquatic ecosystems, at several concentrations (0, 5, 25, 50, 150 and 250 µgl-1 of Pb and 0, 5, 25, 50 µgl-1 of As) for 21 days. The organism’s life history traits, including survivorship, maturation, and reproduction, were recorded daily.

6p chauchaungayxua2 07-01-2020 27 0   Download

In the late 1980’s, a considerable amount of research addressing the effects of acidic deposition was begun, much of it related to the Congressionally mandated National Atmospheric Precipitation Assessment Program (NAPAP). As a result of the 10-year NAPAP program, effects on human health, materials, structures, visibility and terrestrial and aquatic ecosystems were evaluated. As a result of NAPAP funded research, negative effects of acidic deposition were documented on freshwater lakes in the Adirondacks and on the red spruce of the Adirondacks and northern Appalachians....

289p phoebe75 01-02-2013 51 4   Download

Benthic algae have been intensively studied, especially over the past two decades. This intensity has been stimulated by the widespread recognition that benthic algae are ideal indicators of the health of many, if not most, aquatic ecosystems. With this book we hope to synthesize this vital area of research and share its essence with our colleagues and students. We started with an outline of the myriad abiotic and biotic determinants of benthic algal ecology.

781p phoebe75 01-02-2013 45 8   Download

It is a general belief that the fruits and vegetables that our parents ate when they were growing up were more nutritious and enriched with essential mineral nutrients and were less contaminated with toxic trace elements than the ones that are being consumed by us currently. A study of the mineral content of fruits and vegetables grown in Great Britain between 1930 and 1980 has added weight to that belief with findings of such decreases in nutrient density.

790p phoebe75 01-02-2013 54 13   Download

Plant species that invade an alien area and outgrow the native vegetation, establishing and increasing their own territory, often lead to negative economic, environmental, and social impacts. Even native species can behave like invasive species by their exponential spread. Similarly, not all non-native species are invasive. Many alien invasive species, however, do threaten the health and integrity of our terrestrial and aquatic ecosystems.

456p phoebe75 01-02-2013 67 12   Download

Most of the concern about mercury focuses on lakes and other aquatic ecosystems, such as rivers, streams, wetlands and oceans. The levels of mercury found in terrestrial environments are usually not high enough to threaten the health of wildlife and humans. But some aquatic environments favour the transformation of mercury into its more poisonous form — methylmercury — and it is the bioac- cumulation of methylmercury in fish and marine mammals that presents a potential problem when they are consumed by humans.

68p saimatkhauroi 01-02-2013 38 2   Download

Many of the traditionally sound cultural practices recommended for conventional agriculture are also employed in organic production. In fact, organic agriculture has been referred to as “good farming practice without using synthetic chemicals.”2 For example, planned crop rotations, which have multiple benefits in terms of soil building, plant health, pest management, and enhancing biodiversity, are required in annual organic cropping systems.

12p cao_can 02-01-2013 62 2   Download

As shown later, much of the resultant risk to human populations and the ecosystems upon which they depend comes from the pro- jected extremely rapid rate of change in climatic conditions. Indeed, the prospect of such change has stimulated a great deal of new scientific research over the past decade, much of which is elucidating the complex ecological disturbances that can impact on human well-being and health—as in the following example.

27p quygia123 01-11-2012 65 2   Download

The consideration of an ecosystem approach recognizes the important link between fish community structure and its habitat has been further emphasized in the Strategic Vision Great Lakes Fishery Commission first decade of the new millennium (GLFC 2001).

139p lulanphuong 28-03-2012 64 8   Download

The long-term approach to achieving protection is “ecological separation.” A true ecological separation is defined as no inter-basin transfer of aquatic organisms via the Chicago Waterway System at any time – 100% effectiveness. Ecological separation prohibits the movement or interbasin transfer of aquatic organisms between the Mississippi and Great Lakes basins via the CWS. Once established, the impacts of invasive species on ecosystem health are permanent and irreversible.

112p lulanphuong 19-03-2012 119 11   Download