水下气球：昆虫幼虫的浮力控制

Insect larval buoyancy is controlled by material properties of their air sacs Jon F. Harrison1 and H. Arthur Woods2 I n lakes and oceans, billions of animals migrate vertically every day, feeding in surface waters at night and descending out of the photic zone during the day to escape predatory fish. Many mi- grants are crustacean zooplankton, such as copepods, that move vertically by passive sinking, active vertical swimming, and al- terations in body lipid composition (1, 2). Such transit plays important roles in food webs and nutrient transfer (3). On page 398 of this issue, McKenzie et al. (4) report that insects also migrate vertically. …