TITLE:
Preliminary Findings on Temporal and Spatial Variations in Phosphate Dynamics in Riverine Systems in Samoa
AUTHORS:
Taema Imo, Patila Amosa, Roya Ieremia, Tina Mareko, Taua Veni-Nun Yan
KEYWORDS:
Ecosystem Services, River Ecosystems, Nutrients, Climate Change, Samoa
JOURNAL NAME:
American Journal of Climate Change,
Vol.14 No.2,
June
10,
2025
ABSTRACT: This study investigates the temporal and spatial variations of phosphate concentrations in riverine systems, highlighting their relationship with precipitation patterns and temperature. Monthly climate data reveal distinct wet and dry seasons, with precipitation peaking in December and January at over 450 mm and 525 mm, respectively, and reaching its lowest levels in June and July at approximately 75 mm. Maximum and minimum temperatures remain stable, averaging 30˚C and 25˚C, respectively. Phosphate concentrations follow a seasonal pattern, with low levels (1.0 - 1.3 mg/L) recorded from July to November. Peaks occur in December (3.50 ± 0.63 mg/L) and June (4.00 ± 1.34 mg/L), coinciding with periods of heavy rainfall. Increased precipitation likely contributes to runoff from agricultural and residential areas, introducing higher phosphate loads into water bodies. Site-specific analysis reveals statistically significant differences (p