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To properly conserve, restore and manage riverine ecosystems and
the services they provide, it is pertinent to understand their
functional dynamics. Growing human populations and high dependency
on natural resources in developing countries have exerted pressure
on land and water resources. However, there is a major knowledge
gap concerning the influence of human activities on the functioning
of tropical rivers in terms of organic matter processing and energy
sources supporting riverine consumers. This thesis explores the
functioning of tropical upland streams and savanna rivers by
assessing the spatial and temporal dynamics in organic processing
under different land-use and discharge conditions and the resultant
influence on energy sources for riverine consumers. This thesis
contributes to the theories of river functioning and has improved
understanding of the functioning of African tropical streams by
identifying a diverse macroinvertebrate shredder guild and
determining its role in organic matter processing. This thesis also
shows that large mammalian herbivores enhance terrestrial-aquatic
food web linkages in African savanna rivers via the transfer of
organic matter. The findings of this researcht are useful for
defining future research needs and actions for sustainable
management of agriculturally influenced streams and savanna rivers
in landscapes witnessing declining wildlife populations and
changing land uses.
To properly conserve, restore and manage riverine ecosystems and
the services they provide, it is pertinent to understand their
functional dynamics. Growing human populations and high dependency
on natural resources in developing countries have exerted pressure
on land and water resources. However, there is a major knowledge
gap concerning the influence of human activities on the functioning
of tropical rivers in terms of organic matter processing and energy
sources supporting riverine consumers. This thesis explores the
functioning of tropical upland streams and savanna rivers by
assessing the spatial and temporal dynamics in organic processing
under different land-use and discharge conditions and the resultant
influence on energy sources for riverine consumers. This thesis
contributes to the theories of river functioning and has improved
understanding of the functioning of African tropical streams by
identifying a diverse macroinvertebrate shredder guild and
determining its role in organic matter processing. This thesis also
shows that large mammalian herbivores enhance terrestrial-aquatic
food web linkages in African savanna rivers via the transfer of
organic matter. The findings of this researcht are useful for
defining future research needs and actions for sustainable
management of agriculturally influenced streams and savanna rivers
in landscapes witnessing declining wildlife populations and
changing land uses.
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