Annual Journal of Civil Engineering in the Ocean Vol.38
EFFECTS OF DISTURBANCE BY SAND COVERING AND BIOTURABATION ON BENTHIC ASSEMBLAGE IN AN ARTIFICIAL TIDAL FLAT
2022 Volume 78 Issue 2 Pages I_673-I_678
Details
2022 Volume 78 Issue 2 Pages I_673-I_678
An artificial tidal flat in Okinosu, Tokushima city, Japan, was created as a habitat for the rare species, Cicindela lewisi (C. lewisi). Considering their rarity, adaptive management by sand covering was implemented in July 2021 to expand the area available for the habitat of C. lewisi. This study aimed to determine the impact of the sand covering on benthic animals. The results showed that Callianassa japonica was dominant on the artificial shore, with an expanded range, as compared to that in 2015. Although many bivalves were noted, no adult Ruditapes philippinarum and Laternula marilina were found, suggesting a negative impact of C. japonica. In the sand-covered area, the ground elevation was higher and the grain size of the bottom sediment was larger than in the surrounding areas. Additionally, the dominant species, C. japonica, was eliminated, and Scopimera globose was found, different from other survey points.
