Assessment of seismic survey line cutting on mangroves in the Kalabari region of River State, Nigeria

Abstract

Seismic survey line cutting is a common practice in the oil and gas industry. This research, in the Kalabari region of River State, Nigeria, assessed the impact of seismic survey line cutting on mangrove ecosystems from 1996 to 2012/2013. Employing field surveys, visual on-spot analysis, and mathematical calculations, the study showed a significant increase in mangrove tree densities in newer lines, indicating potential facilitated access for harvesting. T-test analysis demonstrated a statistically significant variance in mangrove tree densities cut between the old and new lines. The study reveals that cuts made in 1996 still had visible impacts in 2013, indicating long-term nature of the damage. The surveyed area was divided into grids for assessment, totalling 333.97 km², with 4.18 km² impacted by seismic line cuts. The findings suggest that 13 square metres of mangroves were destroyed per square kilometre due to these activities, highlighting significant harm to the ecosystems. Understanding these impacts is vital for effective conservation and sustainable management practices. The study recommends extensive revegetation efforts for restoration in the area.