The Biparjoy Cyclone Impact on Molluscan Fauna Inhabiting Clifton Beach, Karachi

Abstract

Intertidal zones are dynamic marine ecosystems subjected to constant tidal fluctuations, exposing organisms to physicochemical stress and environmental variability. Cyclones, such as the Biporjoy Cyclone that impacted the Arabian Sea in June 2023, pose significant threats by inducing mortality, displacement, and altering species communities. Sandy beaches, lacking a solid substratum, exacerbate these effects, making them susceptible to sediment displacement and suspension. This study investigates the impact of Cyclone Biporjoy on molluscan communities at Clifton Beach, Karachi. Sampling conducted in June 2023 revealed notable shifts in species composition post-cyclone. Nevirita didyma emerged as the most abundant mollusc, indicating disturbances caused by the cyclone. Marcia opima also showed increased numbers. The findings underscore the cyclone's profound impact on intertidal dynamics, highlighting implications for biodiversity and community structure. Moreover, ongoing plastic pollution exacerbates beach degradation, compounding environmental challenges. This research contributes valuable insights into the resilience and vulnerability of molluscan populations in coastal ecosystems, particularly in response to natural disturbances like tropical cyclones.