Journal of Experimental Biology, Journal Year: 2024, Volume and Issue: 227(21)
Published: Nov. 1, 2024
If you are a fan of sci-fi cult movies, chances have seen '2001: A Space Odyssey'. The opening the iconic film about future, made in 1968, shows chimpanzee using bone as tool. This is often considered unique trait humans, yet other animals create and use tools to their advantage. For example, humpback whales (Megaptera novaeangliae) bubble-nets tool for capturing prey by exhaling air through blowhole while swimming circles. Although some studies shown how feeding, no one had studied they adapt increase many fish or krill capture much energy creating fishing So, scientists from USA, Denmark New Zealand recorded solitary created incredible learn these help them amount can gulp down this impacts foraging.Andy Szabo (Alaska Whale Foundation, USA) eight more monitored maneuvers feeding alone northern Southeast Alaska between 14 19 July 2019, filming 23 massive mammals producing 83 bubble-nets, with drone cameras above. In addition, attached tags that movements five whales, also beneath water, get closer view what was going on. team then used information quantify number – ranging six area concentric bubble rings, well distance each ring. tagged reconstruct 268 showing began nets at ∼22 m depth, descending further 3.4 initially, pulses produce trains bubbles, 7.3 times bubbles per minute generating inner ring than outer ring.Analyzing structure colleagues realized individual bubble, rising 0.6 s−1, followed trail smaller 'capillary' traveling just 0.1 s−1 its wake. noticed forming rings were size those rings. found within net, concentrated (krill) trapped within. According researchers, lunge engulf single mouthful shortly (∼10 s) after stop making reaching speeds typically 60% not produced bubble-net when feeding. And breathing rates hunting conventionally nets, similar, suggesting building requires without.In conclusion, do foraging simply prey. As like corral them, driving inwards into innermost ring, where easily consumed. propose densities low spread out shallower waters. Humpback beautiful example think, plan hunt successfully, locations numbers would otherwise be too provide sufficient justify exertion.
Language: Английский
