The Inland Aquatic Habitats of Yap

Sanger, Herling; Hopper, David; Schreiner, Ilse; Nafus, Donald; Bright, Greg R.; Lobban, Christopher S. (1989). Nelson, Stephen G. (ed.). The Inland Aquatic Habitats of Yap (Report). Mangilao, Guam: University of Guam Marine Laboratory. pp. 1–82.

• Has attachment: File:JLD728W2.pdf

Abstract: Multidisciplinary survey of freshwater and inland aquatic ecosystems across Yap, Maap, and Gagil-Tomil Islands in the Federated States of Micronesia. Conducted in collaboration with Yap State Marine Resource Management Division, the report synthesizes studies on water chemistry, freshwater fishes, aquatic insects, crustaceans, algae, and vascular plants. Sampling across streams, ponds, marshes, and taro paddies documents nutrient regimes (ammonium-dominated nitrogen systems, low nitrate and phosphate), oxygen variability, and geological influences on hydrology. Biological sections provide baseline inventories of freshwater fishes (dominated by diadromous species such as Eleotris fuscus and Anguilla marmorata), insect communities (low diversity in streams, higher in lentic habitats), decapod crustaceans, and diverse algal assemblages. The report highlights the ecological constraints of intermittent streams, the importance of freshwater habitats for subsistence and development, and the need for conservation-informed management. It serves as a foundational reference for inland resource assessment, aquaculture potential, and environmental planning in Yap.