COVER PHOTO: Tide pools at Corona del Mar State Beach, California, USA, are pictured on the cover. Declines in biodiversity in marine systems are occurring at unprecedented rates and it is essential to evaluate the complexities of the resulting transformations on ecosystems. Bracken et al. used tide pools on the southern California shoreline to experimentally manipulate grazer abundance and quantify mechanisms by which molluscan grazers promote algal abundance. Their results (Article e4439; doi: 10.1002/ecy.4439) suggest that mollusks in the pools enhance the abundance of the algae they consume by recycling nutrients and creating sticky slime trails that promote algal recruitment. Photo credit: Matthew E. S. Bracken. image

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封面照片：封面上显示了美国加利福尼亚州 Corona del Mar 州立海滩的潮汐池。海洋系统生物多样性的下降正在以前所未有的速度发生，因此必须评估由此产生的生态系统变化的复杂性。Bracken 等人利用南加州海岸线上的潮汐池，实验性地操纵了放牧动物的丰度，并量化了软体动物放牧动物促进藻类丰度的机制。他们的结果（文章 e4439;doi：10.1002/ecy.4439）表明，池中的软体动物通过回收养分和创造粘稠的粘液痕迹来促进藻类招募，从而增加它们消耗的藻类的丰度。照片来源：Matthew E. S. Bracken。图像