Although destabilization and stabilization of soft sediments by macro-infauna are regarded as key to understanding benthic community dynamics, how component populations are affected concurrently by both agents was poorly investigated. On an intertidal sandflat, Kyushu, Japan during 1979 − 2014 (previous study) and 2015 − 2019, monitoring was made of the populations of the filter-feeding gastropod, Umbonium moniliferum, the burrow-dwelling ghost shrimp, Neotrypaea harmandi (destabilizer), and the tube-building polychaete, Mesochaetopterus minitus (stabilizer). Results revealed that gastropod population changes were driven by an interplay of shrimp, polychaete, and the stingray, Hemitrygon akajei, foraging for shrimp by sediment excavation. The gastropod went through high abundance (1100 m⁻²) in 1979, extinction during 1986 − 1997, two marked recoveries with peaks in 2001 and 2009, a slight recovery in 2016, and near extinction in 2019. These changes largely followed the fluctuation in shrimp density across a threshold of 160 m⁻² inhibiting gastropod recruitment. The polychaete exhibited intermittent outbreaks with peaks in 2000, 2007, and 2016, with maximum densities of 15,000 − 24,000 m⁻². Sandflat topography and sedimentary variables were measured during 2015 − 2017. Sediment stabilization by polychaete aggregations at the mid-tidal zone is suggested to have boosted gastropod recruitment. Release at sea and retrieval on shore of drift cards mimicking gastropod larvae with 3- to 9-day planktonic duration was conducted in 2008 − 2009 to specify source populations sending larvae to the present population. Potential source populations were censused in 1998 and 2017 − 2018. Their recent virtual extinction appears responsible for the present population’s decline from 2011. This raises the need for metapopulation perspective to understand local dynamics.

尽管宏观上的动物破坏作用使软沉积物的失稳和稳定化被认为是了解底栖生物群落动力学的关键，但对这两种因素如何同时影响组分种群的研究却很少。在潮间带sandflat，九州，日本1979年期间动态- 2014年（以前的研究）和2015年- 2019年，监测被任命为滤食性腹的人群，链珠䗉螺，洞穴居住鬼虾，Neotrypaea harmandi（去稳定），以及管造多头cha（Mesochaetopterus minitus）（稳定剂）。结果表明，腹足纲种群的变化是由虾，多毛et和黄貂鱼（akamiti）的相互作用共同驱动的，通过沉积物挖掘为虾觅食。腹足动物在1979年经历了高丰度（1100 m ^-2），在1986-1997年灭绝，两次明显的恢复，在2001年和2009年达到峰值，在2016年略有恢复，并在2019年接近灭绝。虾密度超过160 m ^-2时，会抑制腹足纲动物的繁殖。该多壳类动物在2000、2007和2016年间表现出间歇性爆发，最大密度为15,000-24,000 m ^-2。在2015年至2017年期间测量了沙堆地形和沉积变量。潮间带中段多沙丘聚集体对沉积物的稳定作用促进了腹足类动物的募集。在2008年至2009年进行了海上放行和在岸上取回模仿腹足纲幼虫的浮游生物，这些幼虫的浮游时间为3至9天，以指定将幼体运送到目前种群的来源种群。在1998年和2017年至2018年对人口来源进行了人口普查。他们最近的虚拟灭绝似乎是造成当前人口自2011年以来下降的原因。这增加了从人口迁移角度了解当地动态的需求。