2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2021 | 2:00 PM - 3:30 PM | LIVESTOCK AS VECTORS OF ORGANIC MATTER AND NUTRIENT LOADING IN AQUATIC ECOSYSTEMS IN AFRICAN SAVANNAHS | Virtual Platform
LIVESTOCK AS VECTORS OF ORGANIC MATTER AND NUTRIENT LOADING IN AQUATIC ECOSYSTEMS IN AFRICAN SAVANNAHS
Populations of large wildlife have declined in many landscapes around the world, and have been replaced or displaced by livestock. Consequences of these changes on transfer of organic matter (OM) and nutrients from terrestrial to aquatic ecosystems are not well understood. We used behavioural data, excretion and egestion rates and C: N: P stoichiometry of dung and urine of zebu cattle, to develop a metabolism-based estimate of loading rates of OM (dung), C, N and P into the Mara River, Kenya. We also directly measured deposition of OM and urine by cattle into the river during watering. Per head, zebu cattle excrete and/or egest 22.3 g DM (86.6 g wet mass; metabolism) - 24.6 g DM (direct input) of OM, 13.8-22.2 g C, 5.1-10.6 g N, and 0.26-0.50 g P per day into the river. In order to replace loading rates OM of an individual hippopotamus by cattle, 100 individuals will be needed, but much less for different elements. Changing these patterns of OM and nutrients transport and cycling will have significant effects on structure and functioning of both terrestrial and aquatic ecosystems.
- Nutrients
- Organic matter
- Stoichiometry
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Presenters/Authors
Jacob Iteba
(), University of Eldoret, Kenya, mesmerisejsmith@gmail.com;
ASHA DISCLOSURE:
Financial -
Nonfinancial -