Population data are limited for endan gered green (Chelonia mydas) and hawksbill (Eretmochelys imbricata) sea turtles through out the western Pacific Ocean. In the Phil ippine Sea region, the Commonwealth of the Northern Mariana Islands (CNMI) pro vides im portant foraging grounds for both species (Kolinski et al. 2001, 2004, 2006). Although harvesting turtles is illegal in the CNMI under local (CNMI Public Law 0251, 1981) and federal (ESA, 16 U.S.C. § 1531 et seq.) laws, hunting continues today (CNMI Department of Land and Natural Resources 2006, 2009, 2011, 2013a, 2013b). Recovery of these exploited species will re quire conservation actions guided by popu lation assessments and rely heavily on de mographic parameters. Previous studies in the CNMI have used toweddiver and shore line surveys to estimate the abundance of nearshore foraging turtles (

Marine turtles in the western Pacific remain threatened by anthropogenic impacts, but the region lacks long-term biological data for assessing conservation status and trends. The Central West Pacific (CWP) population of green turtles (Chelonia mydas) was listed as Endangered by the U.S. in 2016, highlighting a need to fill existing data gaps. This study focuses on the subset of this population nesting in the Commonwealth of the Northern Mariana Islands (CNMI). Using 11 years of nesting data, we (i) estimate reproductive demographic parameters, (ii) quantify abundance and trends, and (iii) estimate the impacts of anthropogenic threats, such as poaching of nesting females and increasing sand temperatures. In 2006-2016, nesting beach surveys, identification tagging, and nest excavations were conducted on Saipan, and rapid assessments of nesting activity were conducted on Tinian and Rota. On Saipan, temperature data-loggers were deployed inside nests and evidence of poaching (adults and eggs) was recorded. This study documents year-round nesting with a peak in March-July. Nester abundance for the three islands combined was 11.9 ± 5.7 (mean ± standard deviation) females annually, with at least 62.8 ± 35.1 nests observed per year. For 39 tagged individuals, straight carapace length was 95.6 ± 4.5 cm, remigration interval was 4.6 ± 1.3 years, and somatic growth was 0.3 ± 0.2 cm/yr. Reproductive parameter estimates included clutch frequency of 7.0 ± 1.3 nests per female, inter-nesting interval of 11.4 ± 1.0 days, clutch size of 93.5 ± 21.4 eggs, incubation period of 56.7 ± 6.4 days, hatching success of 77.9 ± 27.0%, and emergence success of 69.6 ± 30.3%. Mean nest temperature of 30.9 ± 1.5 • C was above the pivotal threshold of 29.0 • C for temperature dependent sex determination, suggesting a female bias may already exist. Model results suggest (i) hatching success decreases and embryonic death increases when nests experience maximum temperatures beyond 34.4 • C and 33.8 • C, respectively, and (ii) embryonic death increases in nests with mean temperatures beyond 31.1 • C. On Saipan, 32% of nesters were poached, reducing the annual population growth rate from 11.4 to 7.4%. This study provides the first comprehensive assessment of a nesting green turtle population in the Mariana Summers et al. Nesting Ecology of Micronesian Green TurtlesArchipelago, as well as Micronesia, providing baseline data for the endangered CWP population. Our reproductive demographic data, abundance trends, and anthropogenic threat impact analyses are critical for endangered species management, including assessments of population status and fisheries impacts.