Sastrugi sea ice than on multiyear ice. First-year ice is smoother than multiyear ice, which allows the wind to pass uniformly over the surface without topographic obstructions. Except during the melt season, snow is dry and light in climates cold enough for sea ice, allowing the snow to be easily blown and create sastrugi parallel to the wind direction. The locations of sastrugi are fixed by March in the northern hemisphere and may be linked to the formation of melt ponds. Melt ponds are more likely to form in the depressions between zastrugi on first-year ice. Sastrugi Sastrugi, or zastrugi, are
Surface wave detection by animals to these by swimming 15 cm. The neuro-anatomical basis for this ability has not yet been identified. "A lineatus" and similar surface feeding fish (e.g. "Pantadon bucholzi") use a slightly modified lateral line organ called a neuromast to detect surface waves. "A lineatus" has 18 neuromasts (specialized vibration-sensitive lateral line organs) on the dorsal surface of the head of "A lineatus". These are organized into three groups by longitudinal position, and each group is bilaterally symmetric. The groups are, caudal to rostral: nasal/infraorbital (I), supraorbital (II), and supratemporal/post-orbital (III). Each neuromast is a cluster of hair-cell bundles arranged in a