Longitudinal river zonation in the tropics: examples of fish and caddisflies from endorheic Awash river, Ethiopia

Primary Research PaperSpecific concepts of fluvial ecology are well studied in riverine ecosystems of the temperate zone but poorly investigated in the Afrotropical region. Hence, we examined the longitudinal zonation of fish and adult caddisfly (Trichoptera) assemblages in the endorheic Awash River (1,250 km in length), Ethiopia. We expected that species assemblages are structured along environmental gradients, reflecting the pattern of large-scale freshwater ecoregions. We applied multivariate statistical methods to test for differences in spatial species assemblage structure and identified characteristic taxa of the observed biocoenoses by indicator species analyses. Fish and caddisfly assemblages were clustered into highland and lowland communities, following the freshwater ecoregions, but separated by an ecotone with highest biodiversity. Moreover, the caddisfly results suggest separating the heterogeneous highlands into a forested and a deforested zone. Surprisingly, the Awash drainage is rather species-poor: only 11 fish (1 endemic, 2 introduced) and 28 caddisfly species (8 new records for Ethiopia) were recorded from the mainstem and its major tributaries. Nevertheless, specialized species characterize the highland forests, whereas the lowlands primarily host geographically widely distributed species. This study showed that a combined approach of fish and caddisflies is a suitable method for assessing regional characteristics of fluvial ecosystems in the tropicsinfo:eu-repo/semantics/publishedVersio

The Selous-Niassa Wildlife Corridor

Wildlife Division Deutsche Gesellschaft für Technische Zusammenarbeit GTZ Wildlife Programme in Tanzania Dar Es Salaam 2003In the debate on biodiversity conservation two topics have gained prominence in recent years. One is connecting important protected areas by „corridors“ in order to safeguard the vital genetic flow and exchange with the aim to avoid „conservation islands“. The other topic is transboundary partnerships in conservation. This paper describes how a number of governmental and nongovernmental actors under the leadership of the Tanzanian Wildlife Division have worked towards the creation of „Wildlife Management Areas“ on village land in Southern Tanzania, which would serve as a string of protected areas to form a corridor connecting two elephant ranges of high importance, the Selous Game Reserve and ecosystem and the Niassa Game Reserve in Mozambique

The Selous-Niassa Wildlife Corridor

Tanzania Wildlife Discussion Paper No. 34This paper describes how a number of governmental and nongovernmental actors under the leadership of the Tanzanian Wildlife Division have worked towards the creation of „Wildlife Management Areas“ on village land in Southern Tanzania, which would serve as a string of protected areas to form a corridor connecting two elephant ranges of high importance, the Selous Game Reserve and ecosystem and the Niassa Game Reserve in Mozambique

The Selous-Niassa Wildlife Corridor

Wildlife Division Deutsche Gesellschaft für Technische Zusammenarbeit GTZ Wildlife Programme in Tanzania Dar Es Salaam 2003In the debate on biodiversity conservation two topics have gained prominence in recent years. One is connecting important protected areas by „corridors“ in order to safeguard the vital genetic flow and exchange with the aim to avoid „conservation islands“. The other topic is transboundary partnerships in conservation. This paper describes how a number of governmental and nongovernmental actors under the leadership of the Tanzanian Wildlife Division have worked towards the creation of „Wildlife Management Areas“ on village land in Southern Tanzania, which would serve as a string of protected areas to form a corridor connecting two elephant ranges of high importance, the Selous Game Reserve and ecosystem and the Niassa Game Reserve in Mozambique

Understanding effects of proximity on collaboration: Implications for technologies to support remote collaborative work

This chapter analyzes why computers and telecommunications have not created computcr-mediated work environments for collaboration that are as successful as physically shared environments. Our goals are, first, to identify the mechanisms by which proxin~ity makes cnl-laboration easier, concentrating on the way it facilitates interpersollal interaction and aware-ness; and second, to evaluate how current computer-mediated communication technologies provide or fail to provide the key benefits of proximity. We use a decompositional frame-work that examines how visibility, copresence, mobility, cotemporalitv and other affordances of media affect the important collaborative tasks of initiating conversation, establishing common ground, and maintaining awareness of potentially relevant changcs in the collabo-rative environment. Increasingly, collaborating with other people is as likely to take place over distance or time as it is face-to-face. An abundance of new communication technologies has been dcvcloped to mediate remote collaboration: e-mail, bulletin boards, instant messaging, document sharing, videoconferencing, awareness services, and others. Yet collaboration at a distance remains substantially harder to accomplish tha