Search results
Results from the WOW.Com Content Network
The herring population is not completely depleted by orcas because they never eat the whole herring ball during the feeding phase of carousel feeding. [2] The herring that are not consumed are able to escape from the orcas. This means the orcas do not completely deplete their food source and potentially the strongest herring will survive the ...
The orca (Orcinus orca), or killer whale, is a toothed whale and the largest member of the oceanic dolphin family. It is the only extant species in the genus Orcinus and is recognizable by its black-and-white patterned body. A cosmopolitan species, it is found in diverse marine environments, from Arctic to Antarctic regions to tropical seas.
Orcas or killer whales have a cosmopolitan distribution and several distinct populations or types have been documented or suggested. Three to five types of orcas may be distinct enough to be considered different races , [ 1 ] subspecies , or possibly even species [ 2 ] (see Species problem ).
At the time, orcas were not only viewed as costly competition with fishermen for salmon, but as dangerous and threatening to humans as well, and were viewed negatively across the region. In response to these complaints, a machine gun was installed at Seymour Narrows with the intent of killing any orca that passed by.
The release of iron from whale feces encourages the growth of phytoplankton in the sea, [5] which not only benefits the marine food chain, but also sequesters carbon for long periods of time. [5] When phytoplankton, which is not consumed in its lifetime, perishes, it descends through the euphotic zone and settles
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Orcas (Orcinus orca). The killer whale (Orcinus orca) is the largest delphinid species, easily recognized by its size, which can exceed 8 m in length and weigh nine tons, and its black and white coat. [35] This cosmopolitan species undertakes vast, more or less regular migrations.
Although it is not clear why they engage in this activity, beach rubbing has been identified as an important activity to the culture of the entire Northern resident community. [4] This behaviour was originally thought to be unique to the Northern resident community; however, the Southern Alaska resident killer whales have also been observed ...