A simulation experiment was used to understand the importance of riparian vegetation density, channel orientation and flow velocity for stream energy budgets and river temperature dynamics. Water temperature and meteorological observations were obtained in addition to hemispherical photographs along a ∼1 km reach of the Girnock Burn, a tributary of the Aberdeenshire Dee, Scotland. Data from nine hemispherical images (representing different uniform canopy density scenarios) were used to parameterise a deterministic net radiation model and simulate radiative fluxes.

Wetlands seem to be more vulnerable to invasions compared to terrestrial ecosystems. The alien invasive weed, Ludwigia peruviana, invading the wetlands of the Dhansiri catchment and eastern part of Kopili in Assam has threatened the resident biodiversity and has also posed possibilities of spreading to other wetlands of North East India. The present study was conducted to measure the impact of the weed on the biodiversity of this region, to find out the causes for increasing invasiveness and to suggest a suitable management strategy.

The present paper deals with relation between zooplankton and physico-chemical parameters.

Biomass studies are fundamental to understand the dynamics of ecological systems and its distribution. It helps in determining the distribution and flow of materials in the ecosystems. The primary productivity of different vegetation types is of great importance for man as he is so much dependent upon plant products.

The study from March 2011 to February 2012 in the Tanguar haor, Sunamgonj, Bangladesh found three habitat types of vegetation composition as upland, emergent and aquatic which included submerged plants (23), free floating plants (12), rooted floating plants (21), sedges and meadows (35), reed swamp (7), freshwater swamp forest (9), crop field vegetation (21) and homestead vegetations (36) species in the haor. The haor was rich in faunal composition that providing habitat of 122 species of fishes, 28 amphibians, 26 reptiles, 154 birds and 14 mammals in winter season.

Floating gardening, a form of hydroponics using aquatic plants as the medium, is a traditional cultivation system in southern Bangladesh practiced for year-rouund seedling and vegetable production. The livelihoods of marginalized people of the wetlands in North-eastern Bangladesh are often constrained by 7-8 months water stagnation due to floods. A pioneering attempt at scaling up floating gardening in this haor region coincided with repeated, devastated floods in 2007.

Heavy metals are one of the prominent sources of pollution in industrial wastewater and excessive presence of these metals is causing severe health and environmental problems.