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Differential responses of aquatic and aerobic forms of Echinochloa crus-galli (L.) Beauv. and E. colona (L.) Link. by morpho-physiological and molecular analysis

100%

Khedr A.-H. A., Serag M. M., Shaaban H. E., Abogadallah G. M.

Environment, Earth and Ecology

2017

tom 1

nr 1

Echinochloa crus-galli and E. colona are serious weeds around the world. Morphological and biochemical features of aquatic and aerobic forms of both species were investigated experimentally by transplanting the seedlings reciprocally between water-saturated and aerobic soils (70% field capacity). When the plants were grown in water-saturated soil, a significant decrease in tiller height was observed in E. crus-galli, but not in E. colona. Upon growing the plants in aerobic soil, internode length and spike dry weight increased significantly in E. crus-galli, but decreased significantly in E. colona. Growth under aerobic condition caused a significant increase in PEPC/Rubisco ratio, but a significant decrease was observed under water-saturated conditions. When E. crus-galli was transplanted in aerobic soil, several forms of peroxidase were upregulated. Contrarily, in E. colona peroxidase isoforms did not respond to habitat change. Gene expression of ADH in E. colona was constitutive at a fairly high level under native habitats then enhanced with reversing habitat that caused anoxic and mild drought conditions. Both species tend to grow faster under aerobic conditions by modifying the photosynthetic machinery and capacity of scavenging of reactive oxygen species. Furthermore, ADH appears to play a role in supporting growth under water-saturated conditions.

Habitat selection and the change in distribution of Asian elephants in Mengyang Protected Area, Yunnan, China

100%

Lin L., Feng L., Pan W., Guo X., Zhao J., Luo A., Zhang L.

Acta Theriologica

2008

tom 53

nr 4

Elephants were confined to Mengyang Protected Area in China and their distribution range had reduced greatly compared to past records. A preliminary study of habitat selection by Asian elephantsElephas maximus Linnaeus, 1758 and their distribution was conducted in Mengyang Protected Area and its surrounds using site visits and transect surveys from July 2003 to December 2006. Although no variable significantly influenced their habitat selection, elephants still showed preference for altitudes between 900 and 1200 m, gradients <30°, and orientations to the south-east, south and south-west. Human activities, including habitat transformation and degradation, disturbance by large infrastructure and poaching were considered to be the main factors inducing elephant distribution changes.

Improving management of shoreline and riparian wetland ecosystems: the case of Lake Tana catchment

88%

Wondie A.

International Journal of Ecohydrology and Hydrobiology

2010

tom 10

nr 2-4

This review paper presents the results of many years’ research and field observations on ecological status of the catchment of Lake Tana in relation to the socioeconomic issues. There are a number of wetlands in Lake Tana region such as shore areas, head springs, permanent and temporary floodplains (riverine and manmade) which serve as crop production, fisheries, sand mining, wetland products harvesting, etc. Population pressure and poverty have led to more intrusive activities, which have damaged the overall natural resources. Poor management practices further restricted the basic ecological services they provide (for example climate control, nutrient retention, drinking water provision, flood protection, etc.). The most outstanding threats of the shoreline and riparian wetlands stability are agriculture, industrial pollution, drainage activities and overharvesting of wetland resources. Management strategies should comprise both biophysical and socioeconomic aspects with emphasis on issues like adoption of watershed/ecosystem approach at policy level, integration of income generation in conservation activities, sharing of responsibility/benefits among local stakeholders, institutional strengthening for environmentally and socioeconomically sustainable development of lakes.

Ograniczanie wyników

1 Acta Theriologica

1 Environment, Earth and Ecology

1 International Journal of Ecohydrology and Hydrobiology

1 Abogadallah G. M.

1 Feng L.

1 Guo X.

1 Khedr A.-H. A.

1 Lin L.

1 Luo A.

1 Pan W.

1 Serag M. M.

1 Shaaban H. E.

1 Wondie A.

1 Zhang L.

1 Zhao J.

1 2017

1 2010

1 2008

Wyniki wyszukiwania

Differential responses of aquatic and aerobic forms of Echinochloa crus-galli (L.) Beauv. and E. colona (L.) Link. by morpho-physiological and molecular analysis

Habitat selection and the change in distribution of Asian elephants in Mengyang Protected Area, Yunnan, China

Improving management of shoreline and riparian wetland ecosystems: the case of Lake Tana catchment