Search results
Results from the WOW.Com Content Network
The vaquita (/ v ə ˈ k iː t ə / və-KEE-tə; Phocoena sinus) is a species of porpoise endemic to the northern end of the Gulf of California in Baja California, Mexico.Reaching a maximum body length of 150 cm (4.9 ft) (females) or 140 cm (4.6 ft) (males), it is the smallest of all living cetaceans.
The International Whaling Commission released its first ever extinction alert to raise awareness surrounding the decreasing vaquita porpoise population.
Porpoises range in size from the vaquita, at 1.4 metres (4 feet 7 inches) in length and 54 kilograms (119 pounds) in weight, to the Dall's porpoise, at 2.3 m (7 ft 7 in) and 220 kg (490 lb). Several species exhibit sexual dimorphism in that the females are larger than males. They have streamlined bodies and two limbs that are modified into ...
This is a list of the native wild mammal species recorded in Mexico.As of September 2014, there were 536 mammalian species or subspecies listed. Based on IUCN data, Mexico has 23% more noncetacean mammal species than the U.S. and Canada combined in an area only 10% as large, or a species density over 12 times that of its northern neighbors.
The estimated historic worldwide sperm whale population numbered 1,100,000 before commercial sperm whaling began in the early 18th century. [87] By 1880, it had declined an estimated 29%. [ 87 ]
The first principle of population dynamics is widely regarded as the exponential law of Malthus, as modelled by the Malthusian growth model.The early period was dominated by demographic studies such as the work of Benjamin Gompertz and Pierre François Verhulst in the early 19th century, who refined and adjusted the Malthusian demographic model.
The study also revealed evidence for a recent expansion in population. [13] Phylogenetic tree analyses found that spectacled porpoises are more closely related to Burmeister's porpoise (Phocoena spinipinnis) [14] than to the vaquita (Phocoena sinus) which appeared to diverge from Burmeister’s and spectacled porpoises in the Pliocene era. [15]
The analysis suggested that protein fortification can make a major difference in protein content. ‘High-protein’ products may be less healthy due to additives