Anthropogenic activities, water quality, and Ichthyofaunal diversity of Navotas riverine ecosystem, Philippines/
Dalawangbayan, Reizell A.
Anthropogenic activities, water quality, and Ichthyofaunal diversity of Navotas riverine ecosystem, Philippines/ Reizell A. Dalawangbayan, Jericho P. Encarnacion, Sheena Mae M. Rivera, and Princess Kaye G. Tamula .-- - Manila: Technological University of the Philippines, 2024. - xii, 214pages: 29cm. +1 CD-ROM (4 3/4in.)
Thesis (undergraduate)
College of Science .--
Includes bibliography.
This study investigates the anthropogenic activities, water quality, and ichthyofaunal
diversity of the Navotas Riverine Ecosystem. It examines the anthropogenic influences,
analyzes the physicochemical and microbiological properties of water, identifies fish
species, evaluates the water quality index, and determines ichthyofaunal diversity using
various indices. Water samples and fish collections were conducted from January to April
2024 at three sites. Key findings indicate that water quality parameters such as temperature
(23.20-37.5°C), dissolved oxygen (6.22-7.84 mg/L), phosphate concentration (0.55-3.72
mg/L), and fecal coliform (350-160,000 MPN/100 mL) failed to meet DENR standards for
Class C water. The TDS (1153.33-10700 ppm) and conductivity (17653.33-21333.33
μS/cm) were also elevated, indicating significant pollution. The study identified low
ichthyofaunal diversity, with six native and one invasive fish species. A total of 269 fish
were collected: 161 from Site 1, 46 from Site 2, and 62 from Site 3. The most abundant
species was Scatophagus argus (19% occurrence), while the invasive Sarotherodon
melanotheron ranked third (17% occurrence). Notably, pH (r = 0.753) correlated highly
with nitrate concentration. S. melanotheron significantly correlated with pH (r = 0.602, p
= 0.019) and nitrates (r = 0.555, p = 0.031). Lutjanus argentimaculatus also had significant
correlations with pH (r = 0.527, p = 0.039) and nitrates (r = 0.651, p = 0.011). Conversely,
S. argus had a negative moderate correlation with temperature (r = -0.529, p = 0.039) and
conductivity (r = -0.536, p = 0.036). These correlations suggest that the water parameters
significantly influence the diversity and abundance of fish in the river. The study concludes
that the river's water quality is heavily influenced by anthropogenic activities which
negatively affect ichthyofaunal diversity. Recommendations include continuous
monitoring, gut and heavy metal analysis of fish, assessment of avifauna diversity, and
strict implementation of conservation regulations.
Environmental science
BTH GF 41 / D35 2024
Anthropogenic activities, water quality, and Ichthyofaunal diversity of Navotas riverine ecosystem, Philippines/ Reizell A. Dalawangbayan, Jericho P. Encarnacion, Sheena Mae M. Rivera, and Princess Kaye G. Tamula .-- - Manila: Technological University of the Philippines, 2024. - xii, 214pages: 29cm. +1 CD-ROM (4 3/4in.)
Thesis (undergraduate)
College of Science .--
Includes bibliography.
This study investigates the anthropogenic activities, water quality, and ichthyofaunal
diversity of the Navotas Riverine Ecosystem. It examines the anthropogenic influences,
analyzes the physicochemical and microbiological properties of water, identifies fish
species, evaluates the water quality index, and determines ichthyofaunal diversity using
various indices. Water samples and fish collections were conducted from January to April
2024 at three sites. Key findings indicate that water quality parameters such as temperature
(23.20-37.5°C), dissolved oxygen (6.22-7.84 mg/L), phosphate concentration (0.55-3.72
mg/L), and fecal coliform (350-160,000 MPN/100 mL) failed to meet DENR standards for
Class C water. The TDS (1153.33-10700 ppm) and conductivity (17653.33-21333.33
μS/cm) were also elevated, indicating significant pollution. The study identified low
ichthyofaunal diversity, with six native and one invasive fish species. A total of 269 fish
were collected: 161 from Site 1, 46 from Site 2, and 62 from Site 3. The most abundant
species was Scatophagus argus (19% occurrence), while the invasive Sarotherodon
melanotheron ranked third (17% occurrence). Notably, pH (r = 0.753) correlated highly
with nitrate concentration. S. melanotheron significantly correlated with pH (r = 0.602, p
= 0.019) and nitrates (r = 0.555, p = 0.031). Lutjanus argentimaculatus also had significant
correlations with pH (r = 0.527, p = 0.039) and nitrates (r = 0.651, p = 0.011). Conversely,
S. argus had a negative moderate correlation with temperature (r = -0.529, p = 0.039) and
conductivity (r = -0.536, p = 0.036). These correlations suggest that the water parameters
significantly influence the diversity and abundance of fish in the river. The study concludes
that the river's water quality is heavily influenced by anthropogenic activities which
negatively affect ichthyofaunal diversity. Recommendations include continuous
monitoring, gut and heavy metal analysis of fish, assessment of avifauna diversity, and
strict implementation of conservation regulations.
Environmental science
BTH GF 41 / D35 2024