Migratory Cetaceans and Their Relation Essay

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Migratory Cetaceans and Their Relation

To the Trophic Level they Feed within the Foodweb

seasonal migratory patterns of 3 species of whales; is the global primary production pattern evidenced in VGPM maps related to their seasonal migration?

What are cetaceans?

Cetaceans are Mammalian Order Cetacea, and include whales, dolphins and porpoises.

The Cetaceans are further separated into two major subgroups: the Mysticetes, the baleen whales, and the Odontocytes, the toothed whales, which includes the smaller dolphins and porpoises. General morphological characteristics of Cetacea are: the fusiform shape of their body (i.e., spindle shaped); their forelimbs are modified into flippers; whereas their hindlimbs are completely vestigial (i.e., not attached to backbone, and hidden within body); their tails have horizontal flukes; they breathe from a dorsally oriented blowhole, a reduced nares resituated on the top of head; they are nearly hairless -- with only a few bristle like whiskers surrounding lips of young; and they are insulated from cooler ambient ocean by their layer of blubber. Some species are noted for their intelligence, and complex group behavior, remarkable communication, and even songs.

2) Choose three marine cetacean species, which are migratory from NOAA Protected Resources List.

1) Gray whale, Eschrichtius robustus. E/D (denotes endangered / depleted stock)

2) Humpback whale, Megaptera novaeangliae E/D

3) Blue whale, Balaenoptera musculus E/D

3) Briefly describe the migratory patterns of each species.

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1) Gray whale migration:

There are two isolated geographic distributions: the North Pacific Ocean group (visible off the coastal waters of Oregon). And the Korean North Pacific group.

TOPIC: Essay on Migratory Cetaceans and Their Relation to the Assignment

The whales summer in the rich feeding grounds of the Bering and Chukchi Seas, southeast Alaska, British Columbia, Washington, Oregon and northern California. They use their ballen to filter feed the copepods, also known as krill… [END OF PREVIEW] . . . READ MORE

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