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An example is the migration of continental populations of Swainson's thrush Catharus ustulatus, which fly far east across North America before turning south via Florida to reach northern South America; this route is believed to be the consequence of a range expansion that occurred about 10,000 years ago. Detours may also be caused by ...
mtDNA control region sequence data indicates that these birds are derived from ancestral American black ducks, being far more distantly related to the mallard, and that the two subspecies, as a consequence of their rather limited range and sedentary habits, are genetically well distinct already. [7] The Florida mottled duck (A. f. fulvigula)
Waterfowl flyways in the United States. The Atlantic Flyway is in violet. The Atlantic Flyway is a major north-south flyway for migratory birds in North America. The route generally starts in Greenland, then follows the Atlantic coast of Canada, then south down the Atlantic Coast of the United States to the tropical areas of South America and the Caribbean. [1]
Mallards are causing severe "genetic pollution" to South Africa's biodiversity by breeding with endemic ducks [134] even though the Agreement on the Conservation of African-Eurasian Migratory Waterbirds – an agreement to protect the local waterfowl populations – applies to the mallard as well as other ducks. [135]
The most common form of tidal migration is to and from the intertidal zone during daily tidal cycles. [10] These zones are often populated by many different species and are rich in nutrients. Organisms like crabs, nematodes, and small fish move in and out of these areas as the tides rise and fall, typically about every twelve hours.
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Hummingbirds are currently migrating north for the summer. Check out this interactive map to see where they have been spotted in New Jersey.
A Florida panther was struck and killed by a vehicle on Nov. 22, making it the 30th panther death of the year in the state and marking a grim milestone: the number of Florida panthers that have ...