claim: while it’s true that studies in some regions show polar bears are lighter in weight than they were in the 1980s, there is no evidence that more individuals are starving to death or becoming too thin to reproduce because of less summer ice.
evidences.evidence_id: Polar bear:173
evidences.article: Polar bear
evidences.evidence: Unlike brown and black bears, polar bears are capable of fasting for up to several months during late summer and early fall, when they cannot hunt for seals because the sea is unfrozen.
evidences.votes: NOT_ENOUGH_INFO NOT_ENOUGH_INFO
evidences.evidence_id: Polar bear:190
evidences.article: Polar bear
evidences.evidence: They still manage to consume some seals, but they are food-deprived in summer as only marine mammal carcasses are an important alternative without sea ice, especially carcasses of the beluga whale.
evidences.votes: REFUTES REFUTES
evidences.evidence_id: Polar bear:231
evidences.article: Polar bear
evidences.evidence: A study in Hudson Bay indicated that both the reproductive success and the maternal weight of females peaked in their mid-teens.Maternal success appeared to decline after this point, possibly because of an age-related impairment in the ability to store the fat necessary to rear cubs.
evidences.votes: SUPPORTS NOT_ENOUGH_INFO
evidences.evidence_id: Polar bear:376
evidences.article: Polar bear
evidences.evidence: In Alaska, the effects of sea ice shrinkage have contributed to higher mortality rates in polar bear cubs, and have led to changes in the denning locations of pregnant females.
evidences.votes: REFUTES REFUTES
evidences.evidence_id: Polar bear:397
evidences.article: Polar bear
evidences.evidence: Steven Amstrup and other U.S. Geological Survey scientists have predicted two-thirds of the world's polar bears may disappear by 2050, based on moderate projections for the shrinking of summer sea ice caused by climate change, though the validity of this study has been debated.
evidences.votes: REFUTES SUPPORTS