22. 飞鼠寻找食物
The objective of this study was to evaluate how northern flying squirrels locate truffles , a subterranean and ephemeral but primary food source. Thus, we evaluated the importance of three factors to the foraging behavior of northern flying squirrels: olfactory chemicals that emanate from truffles; the presence of coarse woody debris , which are often associated with fungi; and we explored the potential role animal memory could play in truffle detection as well. In a foraging arena, squirrels successfully retrieved buried truffles that lacked aboveground cues in 19 of 30 trials and failed to search near treatments that lacked truffles altogether, confirming the importance of olfaction to squirrel foraging. However, squirrels also retrieved truffles that were associated most frequently with surface logs . In addition, the initial detection rate of the truffle + log treatment was significantly greater than the truffle-only treatment. Thus, although squirrels search for truffles primarily using olfaction, they may also benefit by searching near coarse woody debris on the forest floor as an aboveground cue to truffle locations. In addition, because 82% of Sierra Nevada truffle-fruiting locations that were marked in 1996 yielded truffles again the following 2 years, mycophagous animals like northern flying squirrels may benefit by memorizing fruiting locations and foraging at these same locations from year to year.
2017届高考英语牛津译林版选修6总复习基础经典习题《Unit 1 Laughter is good for you》6-1(江苏专用)
2017届高考英语牛津译林版必修3总复习教案《Unit 2 Language(江苏专用)
2017届高考英语牛津译林版必修5总复习基础经典习题《Unit 3 Science versus nature》5-3(江苏专用)5-3
2017届高考英语牛津译林版必修2总复习教案《Unit 1 Tales of the unexplained(江苏专用)
2017届高考英语牛津译林版必修3总复习教案《Unit 3 Back to the past(江苏专用)
2017届高考英语牛津译林版必修2总复习基础经典习题《Unit 2 Wish you were here》2-2(江苏专用)-3
2017届高考英语牛津译林版选修7总复习限时训练《Unit 1 Living with technology》7-1(江苏专用)
2017届高考英语牛津译林版必修2总复习基础经典习题《Unit 2 Wish you were here》2-2(江苏专用)-2
2017届高考英语牛津译林版必修1总复习教案《Unit 1 School life(江苏专用)
川普的国家安全顾问辞职
2017届高考英语牛津译林版选修7总复习基础经典习题《Unit 4 Public transport》7-4(江苏专用)
2017届高考英语牛津译林版必修2总复习基础经典习题《Unit 2 Wish you were here》2-2(江苏专用)-5
国内英语资讯:Chinese official pledges safe development of nuclear energy
2017届高考英语牛津译林版选修7总复习限时训练《Unit 2 Fit for life》7-2(江苏专用)
2017届高考英语牛津译林版选修7总复习基础经典习题《Unit 1 Living with technology》7-1(江苏专用)
2017届高考英语牛津译林版必修3总复习教案《Unit 1 The world of our senses(江苏专用)
国际英语资讯:Syrian army retakes key gas field from IS in central Syria
2017届高考英语牛津译林版必修2总复习限时训练《Unit 3 Amazing people》2-3(江苏专用)
2017届高考英语牛津译林版必修5总复习限时训练《Unit 1 Getting along with others》5-1(江苏专用) (1)
国内英语资讯:South China province reports 21 H7N9 cases in January
Reinvent the wheel 浪费时间做无用功
2017届高考英语牛津译林版必修1总复习教案《Unit 2 Growing pains(江苏专用)
2017届高考英语牛津译林版必修5总复习限时训练《Unit 2 The Environment》5-2(江苏专用)
2017届高考英语牛津译林版必修5总复习限时训练《Unit 3 Science versus nature》5-3(江苏专用)
2017届高考英语牛津译林版必修2总复习基础经典习题《Unit 2 Wish you were here》2-2(江苏专用)
2017届高考英语牛津译林版必修1总复习教案《Unit 3 Looking good,feeling good(江苏专用)
国际英语资讯:May rejects petition calling for Trumps state visit to be called off
美国在对非法移民的突袭中逮捕680多人
2017届高考英语牛津译林版选修7总复习基础经典习题《Unit 2 Fit for life》7-2(江苏专用)
2017届高考英语牛津译林版选修7总复习基础经典习题《Unit 3 The World online》7-3(江苏专用)
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