We have much difficulty the global pop-ulation of polar bears.Trr 相关知识点: 试题来源: 解析 答案1.resulted in 2.for lack of 3.running out of 4.attach importance to 5. figure out 解析 做选词填空题首先要知道所给词的意思,然后结合句意选择最合 适的单词或词组。 1.根据空前 “他的...
analyzing: (1) presentヾay scavenging by polar bears on large whale carcasses; (2) energy values of large whale species; and (3) the ability of polar bears, like the brown bears (Ursus arctos) from which they evolved, to quickly store large amounts of lipids and to fast for extended ...
Polar bears eat seals, caribou, hares, and fish for food. As a consumer of many types of animals, they are a keystone species. Are bears at the top of the food chain? Polar bears are at the top of the polar bear food chain. They are one of several apex predators in the Arctic fo...
Bushfires are threatening to put Kangaroos on the endangered list while melting ice caps are quickly diminishing comfortable habitats for Polar Bears. Wildlife conservation is the practice of preventing these issues from damaging any more of the world’s natural habitats. So much has been taken alre...
Beluga whales (Delphinapterus leucas) fill an important ecological and economic role in Hudson Bay. However, little is known about their diet and a better understanding of beluga populations is required. Though Arctic cod (Boreogadus saida) a
(PhysOrg.com) -- An assumption that wildfires are at a record high today has been incorporated into scenarios used for projections of future climate change. However, several recent analyses of palaeoenvironmental data show that the assumption is quite wr
Modelling the mating system of polar bears: a mechanistic approach to the Allee effect Allee effects may render exploited animal populations extinction prone, but empirical data are often lacking to describe the circumstances leading to an Al... PK Molnar,AE Derocher,MA Lewis,... - 《Proc Biol...
Hybridization is an evolutionary phenomenon that has fascinated biologists for centuries. Prior to the advent of whole-genome sequencing, it was clear that hybridization had played a role in the evolutionary history of many extant taxa, particularly plants. The extent to which hybridization has contrib...
extinction. Similarly, the hunting grounds for polar bears are destroyed due to melting Arctic ice caps. According to a study by Nature Conservancy, at least a quarter of the earth's species are expected to go extinct within the next 40 years if climate change continues to increase at the ...
- 《Journal of Geophysical Research Oceans》 被引量: 0发表: 2024年 The post-emergence period for denning Polar Bears: phenology and influence on cub survival 24 March (SE = 1.6 days), with dates typically occurring later in the Chukchi Sea relative to Southern Beaufort Sea and on land ...