PENGARUH STRUKTUR PASIR DAN RONA LINGKUNGAN TERHADAP PENENTUAN LOKASI PENELURAN PENYU DI PULAU METI DAN PULAU PASIR TIMBUL KABUPATEN HALMAHERA UTARA
Turtles are hard-backed reptiles, living in seawater and breeding eggs. Turtles are classified as animals that are protected by the CITES Appendix I (Convention on International Trade in Endangered Species) category. So that all forms of utilization and distribution must receive serious attention. The location of turtle nesting is a wide and gentle sandy beach area and is located on the upper coast. Location of turtle nesting in North Halmahera Regency is Meti Island and Pasir Timbul Island. This study aims to determine the effect of sand structure and environmental hue to determine the location of turtle nesting. Research using a purposive sampling method was carried out intentionally based on information obtained from the community. Appendix data regarding the structure of sand, temperature, moisture content of the nesting sphere and documentation of vegetation is carried out directly in the field. The results of substrate analysis of the nesting on Meti Island in LP1 location were dominated by granules of 0.425-1 mm by 33.45%, 0.25-0.425 mm by 27.09% and 0.125-0.25 mm by 24.62%. LP2 locations are dominated by granules category of 0.425-1 mm by 31.47%, 0.25-0.425 mm by 28.46% and 0.125-0.25 mm by 20.07%. LP3 locations are dominated by the 0.425-1mm granules category at 34.41% and 0.25-0.425 mm at 31.95%. LP1 nesting temperature ranges around 29.2-31.2 ° C, LP2 ranges between 29.9-31.9° C and LP3 ranges between 30.4-32.1° C. LP1 nesting nest water level ranges between 8.4-10.3° C, LP2 ranges between 8.2-9.7 ° C and LP3 ranges between 6.5-8.9. Sea location of spawning nesting consists of Enhalus acoroides and Sargasum arnaudianum which is a suitable habitat for hatchling enlargement areas. The coastline of the LP1 and LP2 spawning sites has a slope of 35°, while LP3 has a beach slope that varies from 35° to 45° and even some parts of the island of LP3 have a slope of up to 90° due to abrasion so that it becomes a barrier for turtles to reach the spawning location. Land vegetation at LP1 and LP2 locations is dominated by large tree-shaped plants while the LP3 location is dominated by shrubs and creeping plants.