jackknife clam การใช้

• Recently non-indigenous species have become established including the Pacific oyster and Atlantic jackknife clam.
• The Atlantic jackknife clam is now also found in northwestern Europe, where it is regarded as a harmful exotic species.
• "' Jackknife clam "'is a common name which is used for several species in the genera " Ensis " and " Pacific beaches of temperate North America.
• The Atlantic jackknife clam has inspired a kind of biomimetic anchor in development by a team at the Massachusetts Institute of Technology, adapting the clam's digging method for use in keeping undersea cables and potentially watercraft anchored securely.
• At low tide the position of the Atlantic jackknife clam is revealed by a keyhole-shaped opening in the sand; when the clam is disturbed, a small jet of water squirts from this opening as the clam starts to dig.
• When a Pacific razor clam ( " Siliqua patula " ) is laid on the surface of the beach it can bury itself completely in seven seconds and the Atlantic jackknife clam, " Ensis directus ", can do the same within fifteen seconds.