Changes in northern Tanzania coral reefs during a period of increased fisheries management and climatic disturbance
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Published source details
McClanahan T.R., Muthiga N.A., Maina J., Kamukuru A.T. & Yahya S.A. (2009) Changes in northern Tanzania coral reefs during a period of increased fisheries management and climatic disturbance. Aquatic Conservation: Marine and Freshwater Ecosystems, 19, 758-771.
Published source details McClanahan T.R., Muthiga N.A., Maina J., Kamukuru A.T. & Yahya S.A. (2009) Changes in northern Tanzania coral reefs during a period of increased fisheries management and climatic disturbance. Aquatic Conservation: Marine and Freshwater Ecosystems, 19, 758-771.
Actions
This study is summarised as evidence for the following.
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Designate a Marine Protected Area and prohibit some fishing and collection (including where restrictions are unspecified) Action Link |
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Designate a Marine Protected Area and prohibit some fishing and collection (including where restrictions are unspecified)
A replicated, site comparison study in 1996–2005 in four areas off the coast of Tanzania and Kenya (McClanahan et al. 2009) reported that sites in areas where some fishing and collection was prohibited had more coral species groupsut lower soft coral cover than sites in areas with no formal management restrictions. Results were not tested for statistical significance. Two areas that restricted some fishing and collection both had 39 groups (genera) of coral species, 22–43% cover of hard corals and 3–8% of soft corals. A further area with some restrictions was reported as having an “intermediate” number of species groups, 32–73% cover of hard corals and 1–5% cover of soft corals. An area with no formal management had 23–25 species groups, 45–52% cover of hard corals and 4–17% of soft coral. When all areas with restrictions (including one area that prohibited all fishing and collections) and areas without restrictions were analysed together, no significant differences were found in the abundance of different coral species groups over time. Two to four sites were selected from each of three areas with restrictions, and two sites were selected from an area with no formal management. Each site was sampled using nine 10 m transects and all organisms 3 cm or larger were recorded.
(Summarised by: William Morgan)
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