The Karnaphuli Estuary Essay - 9291 Words.

Diversity of testacean Protozoa in River Tisza after a cyanide and metall pollution at the beginning of year 2000. Preliminary study.

Nematode infections with clinical manifestations affecting the skin (onchocerciasis, habronemiasis) and the respiratory tract (lungworm infection) are discussed later in this chapter. Chapter 4 discusses nematode infection of neural and somatic tissues (Halicephalobus spp.); Chapter 10 discusses infection of ocular tissues (Thelazia spp.).

FIGURE 5-1 Hypothetical examples show how the impact of an oil spill and subsequent recovery can be assessed when the system under study undergoes natural variations (solid line). In (A), the system varies in time, but the long-term mean remains unchanged. In (B), there is a long-term decline in the state of the system (e.g., population size).

Marine ecosystem, complex of living organisms in the ocean environment. Marine waters cover two-thirds of the surface of the Earth. In some places the ocean is deeper than Mount Everest is high; for example, the Mariana Trench and the Tonga Trench in the western part of the Pacific Ocean reach.

The expansion of fishing activities into deeper waters 1 is unquestionably one of the principal threats to the world's ocean health 2.Most deep-sea fisheries are unsustainable not only for target species but also for non-target fauna and their habitats 3.Unless some radical changes in governance and management are being made 4, damages to deep-sea ecosystems will soon be irreversible.

Despite huge efforts by academia and pharmaceutical industry, cancer remains the second cause of disease-related death in developed countries. Novel sources and principles of anticancer drug discovery are in urgent demand. Marine-derived natural products represent a largely untapped source of future drug candidates. This review focuses on the anticancer drug discovery potential of marine.

Macrobenthos comprises the larger, more visible, benthic organisms that are greater than 1 mm in size. Some examples are polychaete worms, bivalves, echinoderms, sea anemones, corals, sponges, sea squirts, turbellarians and larger crustaceans such as crabs, lobsters and cumaceans.

The distribution patterns of macrobenthos are largely influenced by the hydrobiological and physico-chemical characteristics of the environment. The diversity of functional groups of benthos provides a comprehensive reflection of environmental gradients and habitat quality.

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The EUNIS habitats classification builds upon previous initiatives (Corine-biotopes followed by the palearctic habitats classification), but introduces agreed-upon criteria for the identification of each habitat unit and provides a correspondence with other classification-types (the two above-mentioned, Corine land-cover typology, habitats.

Concluding student activities: - the student defines the main types of freshwater ecosystems and wetlands; - student understand the role of hydrological and physicochemical factors in the development of wetland ecosystems - the student knows the main methods used in palaeolimnological data interpretation - student discusses the theoretical basis for the ecology of freshwater ecosystems.

Mangrove swamps are coastal wetlands found in tropical and subtropical regions. They are characterized by halophytic (salt loving) trees, shrubs and other plants growing in brackish to saline tidal waters. These wetlands are often found in estuaries, where fresh water meets salt water and are infamous for their impenetrable maze of woody.