衢州塑料挤出机设备厂家 风景变暖让灰熊弃荤从素改吃浆果

灰熊本是食肉动物，然则当前阿拉斯加科迪亚克岛的灰熊却废弃了鲑鱼而转而以浆果为主食，酿成了“素食者”衢州塑料挤出机设备厂家，这是若何回事呢？

Grizzly bears have stopped eating salmon in favour of elderberries after being forced to make a choice due to climate change. Warming temperatures meant that the berries are ripening earlier than usual, at exactly the same time as the freshwater streams on Alaska’s Kodiak Island are overflowing with sockeye salmon. 由于风景变化的影响，灰熊被行动念登程愤抉择，废弃鲑鱼改吃接骨木果。和煦的风景使得浆果训导期提前，与此同期，阿拉斯加科迪亚克岛的淡水河流里也挤满了红鲑。

The island's brown bears typically feed first on salmon in early summer, followed by elderberries later in the season, in late August and September. 往年衢州塑料挤出机设备厂家，岛上的棕熊在夏初先吃了鲑鱼，然后在八月末和九月吃接骨木果。

"What you have is a scrambling of the schedule," said William Deacy, a biologist at Oregon State University that studied the phenomenon. 参议这个处所的俄勒冈州立大学的生物学威廉•迪西称：“如今的生物训导期端重大。”

"It's essentially like if breakfast and lunch were served at same time and then there is nothing to eat until dinner. “这就好比早餐和午餐同期奉上来，那么晚餐前就什么王人没得吃了。”

"You have to choose between breakfast and lunch because you can only eat so much at a time." “你须在早餐和午餐间作念抉择衢州塑料挤出机设备厂家，因为你次只可吃那么多。”

The study found that during the unusually warm summer of 214, the bears, which would traditionally kill up to 75 percent of the salmon, were nowhere to be seen near the streams. 参议发现，在214年，夏日端和煦，但活水旁却不见灰熊的踪迹。照平日来说，塑料挤出设备它们这时候可要吃掉达75的鲑鱼。

Instead, they were in the hills busy munching on berries, which contain less protein and therefore take less energy to break down, causing them to gain weight more quickly. 然则，它们反常态，跑到山上大吃浆果。浆果内部的卵白质含量低，消化证据所需能量少，因此它们长胖的速率也加速了。

Biologists warned that changes caused by a warming planet were behind the bears' unusual behavior and could affect the entire ecosystem. 生物学们告诫称，灰熊不寻常的举止背后反馈的是公共变暖所带来的变化衢州塑料挤出机设备厂家，可能会影响总共生态系统。

The researchers found that the forests around the streams suffered because the bears’ fish carcasses were no longer there to enrich the soil. 参议东谈主员发现，莫得灰熊吃剩的鱼骸来给泥土增肥，河流周围的丛林已受到了影响。

"Bears switched from eating salmon to elderberries, disrupting an ecological link that typically fertilizes terrestrial ecosystems and generates high mortality rates for salmon," the study said.参议标明：“灰熊不吃鲑鱼改吃接骨木果的举止不仅结巴了柔润陆地生态系统的生态链，还促成了鲑鱼的弃世率。”

On average, red elderberries are said to be ripening two and a half days earlier every decade. 据称，平均每十年，红接骨木果训导的时间会提前两天半。

If the pattern continues, they will regularly overlap with the salmon by 27. 如若再这么下去，到27年，鲑鱼和接骨木果的训导期将会按期重。

The study was published in the Proceedings of the National Academy of Sciences. 这项参议能已在《好意思国科学院学报》上发表。

英文起：雅虎翻译：黄敏欣（日报网新闻iNews译者）编审：丹妮衢州塑料挤出机设备厂家