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RESEARCH ARTICLE

Effect of stingray (Hemitrygon akajei) foraging on a ghost shrimp population (Nihonotrypaea harmandi) on an intertidal sandflat, western Kyushu, Japan

Akio Tamaki A B , Kazuyuki Harada A , Yoshinobu Sogawa A and Seiji Takeuchi A
+ Author Affiliations
- Author Affiliations

A Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan.

B Corresponding author. Email: tamaki@nagasaki-u.ac.jp

Marine and Freshwater Research 71(9) 1128-1148 https://doi.org/10.1071/MF19265
Submitted: 29 July 2019  Accepted: 25 November 2019   Published: 31 January 2020

Abstract

Callianassid shrimp residing in deep burrows have large bioturbating effects on marine soft-bottom communities. A few predators that excavate deep pits could have substantial effects on shrimp populations, as well as knock-on effects. Processes and consequences of such effects on shrimp populations are poorly understood. On a 300-m-wide intertidal sandflat area between tide marks in western Kyushu between 1989 and 1994, shrimp population densities were stable, reaching >1300 individuals m–2. Dasyatid stingray feeding pits reaching depths up to 20 cm occurred abruptly in large numbers in 1994, after which shrimp densities decreased yearly to hundreds of individuals per square metre in 2001. The densities of ray feeding pits formed per day were monitored every or every other spring tide between 2000 and 2001. Schools of rays were enclosed during submerged times and their body sizes recorded alive to determine size-frequency distribution. The body-size frequency distributions of shrimp were compared among the gut contents of several rays, ray feeding pits and intact sandflat. Reductions in the shrimp density per ray feeding bout compared with the density on the intact sandflat were recorded. A model of daily predation at different seasonal rates was used to simulate the yearly change in shrimp density. The result was consistent with the actual change.

Additional keywords: bioturbation, spatial scale, top-down forcing.


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