Tana Delta Irrigation Project, Kenya: An Environmental Assessment

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Rehabilitation of the Tana Delta Irrigation Project, Kenya: An Environmental Assessment. 67 Lango La Simba One of the “old channel forests”. Previously this forest had one troop of colobus, but during this survey, only one solitary adult was seen. The other “old channel forest”, Hewani South 2 (#64) also had a reduction in colobus numbers. Further census will show if indeed there is a trend between loss of colobus in this type of forest as has been seen in senescent and dying forests #30, 33, 41, 45, 51, 52 along Channel 1 (Butynski and Mwangi, 1994). This forest had a high buffalo population. There is a possibility that troops were missed by teams looking more closely for buffalo than for monkeys though all teams had been increased from two to four members to increase the number of people looking for both buffaloes and monkeys. 68 Wema East 4 Curiously, mangabeys have not been previously sighted in this large forest until this survey. The move of a troop to this forest from nearby #56 which had steady sightings of mangabeys until 1989. 69 Mitapani South 1 70 Mitapani South 2 Unknown forest Four elephants in this forest. Though four transects were started, only one was completed. One mangabey troop was sighted. This group is probably genetically isolated from the main concentration of mangabeys to the north. This forest was very difficult to find due to the change of the river course and the lack of canoes to transfer the team to the other side. Therefore, this forest was not censused however in the 2000 and 2001 censuses, neither red colobus nor mangabey were observed. Although this forest is not on the original list of forests to census, we observed a group of colobus while we were in the area. Status and Distribution of Sykes Monkeys and Yellow Baboons Tana River sykes monkey (Cercopithecus mitis albotorquatus) and yellow baboons (Papio cynocephalus cynocephalus) were observed throughout the census area. Nineteen troops and one solitary adult of sykes and twelve troops of baboon were recorded. Other groups were seen outside forest patches. Due to the inconsistency of counts of individuals, this information was not collected for either sykes or baboon. RECOMMENDATIONS In the light of the survey carried out and the subsequent observations, the following brief recommendations are made: 1. Assessments should be made on the two groups of colobus in the northern section of the census area to determine their long term survival risk and to review potential management strategies to incorporate them into the main population area depending on appropriate available forest habitat. 2. Forest #58 and #64 are important for mangabeys as they are the only forests with more than one troop (three and four respectively), only #58 had significant troop numbers of both mangabeys and colobus making it the most crucial forest in terms of requirements for conservation. 3. An assessment should be made to establish the suitability of erecting colobridges between isolated trees, between forest patches and over the Tana River to provide habitat corridors. Since 1997, colobridges have been successfully providing habitat connectivity in the Diani area (150,000 crossings per year for 22 colobridges). This could be an additional tool in developing corridors at the early stage, and for enabling connectivity between forest patches across barriers such as the Main Canal, Tana River and Main Access Roads. 99
Rehabilitation of the Tana Delta Irrigation Project, Kenya: An Environmental Assessment. FOREST REFERENCE CHART The following chart serves as a reference for use with the supplied maps. Forest numbers are translated to forest names, and also the UTM Grid coordinates are given for each forest to enable future surveys to understand the forests censused. Table 20. Forest reference. Forest # Forest Name Easting 1 Northing 2 46 Sailoni 1 630269 9762082 47 Sailoni 2 629320 9760870 48a Kulesa East 1 630270 9760824 49 Kulesa West 1 629306 9760230 50 Kulesa West 2 629430 9758876 53 Wema West 1 629978 9758220 54 Wema West 2 629202 9757212 55 Wema West 3 629734 9755858 56 Wema East 1 630388 9757212 57 Wema East 2 (d) 630392 9756766 58 Hewani West 1 630361 9754890 59 Hewani East 1 630101 9753874 60 Hewani East 2 630774 9753962 61 Hewani East 3 630897 9753716 62 Hewani West 2 630108 9753566 63 Hewani South 1 632347 9752502 64 Hewani South 2 630829 9752250 65 Bvumbwe North 631670 9761054 66 Bvumbwe South 633425 9755526 67 Lango La Simba 633787 9751614 68 Wema East 4 631569 9756966 69 Mitapani 1 629536 9747674 0 Unknown forest 630526 9761374 1 Easting using Grid: UTM Zone 37 South, Datum ARC 1960 2 Northing using Grid: UTM Zone 37 South, Datum ARC 1960 100
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REHABILITATION OF THE TANA DELTA IR
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Rehabilitation of the Tana Delta Ir
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INSTITUTIONAL LINKAGES Primary link
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Tana Delta Irrigation Project, Kenya: An Environmental Assessment

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