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AQUATIC INVERTEBRATES OF THE OKAVANGO DELTA

AQUATIC INVERTEBRATES OF THE OKAVANGO DELTA. Previous studies AQUARAP – June 2000 - High water survey. Conservation International. (leeches, snails, crabs, bugs, mayflies, dragon/damselflies)

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AQUATIC INVERTEBRATES OF THE OKAVANGO DELTA

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  1. AQUATIC INVERTEBRATES OF THE OKAVANGO DELTA Previous studies • AQUARAP – June 2000 - High water survey. Conservation International. (leeches, snails, crabs, bugs, mayflies, dragon/damselflies) • AQUARAP – Feb 2003 - Low water survey. Conservation International. (All groups recorded, identification to morphospecies, specialist involvement – beetles, snails, bugs, mayflies, caddisflies, crustaceans) • Dallas HF and Mosepele B (2007). A preliminary survey and analysis of the spatial distribution of aquatic invertebrates in the Okavango Delta, Botswana. African Journal of Aquatic Science 32(1): 1-11.

  2. AQUATIC INVERTEBRATES OF THE OKAVANGO DELTA Specialist studies Molluscs: • Appleton CC (1979) • Brown DS, Curtis BA, Bethune S and Appleton CC. 1992 • Curtis BA (1997) • Curtis BA and Appleton CC. (1987) Coleoptera: • Bilardo A and Rocchi S (1987)

  3. Key results: • >180 morphospecies (approx. 63 families) were recorded • Spatial variation: Assemblages in each of the four focal areas were at least 54% similar at morphospecies level, and 72% similar at family level. • Habitats differences: Invertebrate assemblages from deltaic habitats and pools habitats different (isolated, seasonally-flooded and temporary rain-filled pools).

  4. No clear temporal / seasonal trends Number of Taxa and abundance at sites in Guma for each month sampled. G5, G8 are in Guma Lagoon, G6 is in the main channel and G7 in Thaoge Channel.

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