Iska Desmawati : Spatial Distribution of Birds Conserved by Indonesian Law in Wonorejo, Surabaya Eastcoast
Iska Desmawati S.Si., M.Si.
Wonorejo is one of Important Bird Area, specifically for bird conserved by Indonesian law. This research aims to know abiotic factor : temperature, light penetration, humidity and sediment profile, landscape (the type of habitats), distribution and abiotic factor which influence the distribution of birds in Wonorejo, Surabaya eastcoast. The research to study about spatial distribution of bird conserved by Indonesian law had been conducted on February-April 2013 in Wonorejo, Surabaya Eastcoast.The parameters analyzed are abiotic factors, the type of habitats and birds species using mapping method. Distribution study of Birds conserved analysed by Poisson distribution models, Chi Square, map and visual ilustration. Environmental factors are more influential analyzed by using RDA (Redundancy Analysis) through CANOCO for Windows 4.5. The results showed that the factors of abiotic environmental in Wonorejo, Surabaya East Coast varies among areas with average temperatures ranging between 31-33.50 C, light penetration ranged between 6355-18877 lux and humidity ranges between 70-80. Profile of the sediments that make up the region of Wonorejo is dominated by Sandy mud and sedimentary deposits of biogeneus. Birds conserved species found in Wonorejo covers 20 species are included in the 9 families from Alcedinidae, Ardeidae, Scolopacidae, Laridae, Nectarinidae, Rhipiduridae, Charadriidae, Cuculidae and Recurvirostridae. The RDA diagram show that environmental factor such as Light penetration and humidity was not influential towards the distribution of birds conserved, whereas the temperature effects on distribution of birds conserved. The distribution of birds conserved in Wonorejo uneven on the overall area. The distribution of individuals in each species found are likely aggregated.