Factors influencing the distribution of mysids (Crustacea: Mysidacea) in Chilaw lagoon, Sri Lanka
Neetha Nandanie Punchihewa
The main objective of this study was to locate the mysid habitats in Chilaw lagoon as a novel study. Surveys were undertaken from July 2012 to May 2013 during daytime, along the boundary of the lagoon. Samples were collected using a dip net of 500 µm mesh size with an opening of 25 × 20 cm2 at fifteen randomly selected sites along the lagoon. Mesopodopsis zeylanica, Mesopodopsis orientalis and new Sirella srilankensis were identified. Mesopodopsis zeylanica being the most abundant species. Survey of temporal variation in mysid abundance was also conducted at two sites for a six-month period starting from July 2012 to December 2012. Mysid species did not show any temporal variation. The abundance of mysids negatively correlated (P ≤ 0.05) with temperature and salinity. The spatial distribution of mysids along the lagoon boundary was found from 13 sites and mysids were not recorded from two sites. These areas are vulnerable to effluent discharge from nearby shrimp farms, and this may be the most likely reason behind the absence of mysids in this area.
Neetha Nandanie Punchihewa. Factors influencing the distribution of mysids (Crustacea: Mysidacea) in Chilaw lagoon, Sri Lanka. International Journal of Ecology and Environmental Sciences, Volume 3, Issue 4, 2021, Pages 73-80