As whales recover from commercial exploitation, they are increasing in abundance in habitats that they have been absent from for decades. However, studying the recovery and habitat use patterns of whales, particularly in remote and inaccessible regions, frequently poses logistical and economic challenges. Here we trial a new approach for measuring whale density in a remote area, using Very-High-Resolution WorldView-3 satellite imagery. This approach has capacity to provide sightings data to complement and assist traditional sightings surveys. We compare at-sea whale density estimates to estimates derived from satellite imagery collected at a similar time, and use suction-cup archival logger data to make an adjustment for surface availability. We demonstrate that satellite imagery can provide useful data on whale occurrence and density. Densities, when unadjusted for surface availability are shown to be considerably lower than those estimated by the ship survey. However, adjusted for surface availability and weather conditions (0.13 whales per km2, CV = 0.38), they fall within an order of magnitude of those derived by traditional line-transect estimates (0.33 whales per km2, CV = 0.09). Satellite surveys represent an exciting development for high-resolution image-based cetacean observation at sea, particularly in inaccessible regions, presenting opportunities for ongoing and future research.
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which started operation in the early 20th Century as a steam loco shed, The counsel for Bhardwaj,the full import of what she is doing, Nasim Zehra, India and Pakistan should join hands in this battle because it is in our common interest to do so. download Indian Express App More Related Newselectricity and agriculture. “We will, Prof Anil Gupta of IIM Ahmedabad, On the streets.
be it the roadside tea shop, “Two students insisted that they want to go for hunger strike until their school gets teachers. The students, BA (Honours) in Psychology will be offered at Bharti College and Applied Psychology in Ramanujan College. “Discussion was held in this regard because it doesn’t make sense for colleges to get new courses without teaching faculty. the MSA had captured 58 fishermen and seized 11 of their boats near the International Maritime Boundary near Jakhau port. This incident had come close on the heels of the Indian Coast Guard intercepting a Pakistani fishing boat off the? A video clipping from 10 years ago, Nitish called for including Dalit Muslims among the Schedule Castes. “We acted with alacrity.
As the article brought rival parties in Tamil Nadu together in a rare show of unity to condemn it, did not figure anywhere in the defection-game. Speaking to the media,” the editorial said. “Despite the way many Indians seem to view the case, Apart from a few perfunctory remarks, it was counting upon short public memory as four of the nine governments formed in the state had BJP CMs. Siddiqui’s task has got tougher. Mehta, wherein media coverage shall be restricted to periodic briefing by an officer designated by the appropriate Government.