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Forced into an ecological corner: Round-the-clock deep foraging on small prey by elephant seals


Abstract
Small mesopelagic fishes dominate the world’s total fish biomass, yet their ecological importance as prey for large marine animals is poorly understood. To reveal the little-known ecosystem dynamics, we identified prey, measured feeding events, and quantified the daily energy balance of 48 deep-diving elephant seals throughout their oceanic migrations by leveraging innovative technologies: animal-borne smart accelerometers and video cameras. Seals only attained positive energy balance after feeding 1000 to 2000 times per day on small fishes, which required continuous deep diving (80 to 100% of each day). Interspecies allometry suggests that female elephant seals have exceptional diving abilities relative to their body size, enabling them to exploit a unique foraging niche on small but abundant mesopelagic fish. This unique foraging niche requires extreme round-the-clock deep diving, limiting the behavioral plasticity of elephant seals to a changing mesopelagic ecosy ....

Pacific Ocean , Northeast Pacific Ocean , பெஸிஃபிக் கடல் , வடகிழக்கு பெஸிஃபிக் கடல் ,

Touching Songs of Whale Can Serve as an Ocean of Untapped Seismic Data


Feb 17, 2021 09:39 AM EST
According to the new experiment carried out in the Northeast Pacific Ocean, the process by which the songs of Fin whales resound back from the ocean floor could become a useful mechanism for researchers examining the sediment and rock that make up the Earth s crust. 
These songs are some of the strongest and most extensive vocalizations in the ocean, and with thousands of fin whales widen across the planet, the songs could adjoin with existing scans or fill in gaps where it s even more dangerous to use conventional air gun approach to marine life.
(Photo : Elianne Dipp) ....

Oregon State University , United States , Pacific Ocean , John Nabelek , Elianne Dipp , Northeast Pacific Ocean , Blanco Fracture Zone , Beaked Whale Breaks Diving Record , Blue Whale , Biggest Animal , Nature World , ஓரிகந் நிலை பல்கலைக்கழகம் , ஒன்றுபட்டது மாநிலங்களில் , பெஸிஃபிக் கடல் , வடகிழக்கு பெஸிஃபிக் கடல் , ப்ளான்க்கோ எலும்பு முறிவு ஸோந் , நீலம் திமிங்கிலம் , மிகப்பெரியது விலங்கு , இயற்கை உலகம் ,