کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6299050 1617910 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Indirect effects of bioinvasions in Yellowstone Lake: The response of river otters to declines in native cutthroat trout
ترجمه فارسی عنوان
اثر غیر مستقیم بیوفیزیک در دریاچه یلوستون: پاسخ رودخانهای رودخانه به کاهش ماهی قزل آلا بومی
کلمات کلیدی
ارتباطات آب و فضایی، ضبط-ضبط، گونه های معرفی شده، نمونه برداری غیر انتسابی، میزان جمعیت، ناباروری،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی
Nonnative species threaten ecosystems throughout the world - including protected reserves. In Yellowstone National Park, river otters Lontra canadensis depend on native cutthroat trout as prey. However, nonnative lake trout and whirling disease have significantly reduced the abundance of these native fish in the park's largest body of water, Yellowstone Lake. We studied the demographic and behavioral responses of otters to declining cutthroat trout on Yellowstone Lake and its tributaries. From 2002-2008, we monitored otter activity at latrine (scent-marking) sites, collected scat for prey identification, and used individual genotypes from scat and hair samples to evaluate survival and abundance with capture-recapture methods. Otter activity at latrines decreased with declines in cutthroat trout, and the prevalence of these fish in otter scat declined from 73% to 53%. Cutthroat trout numbers were the best predictor of temporal variation in apparent survival, and mean annual survival for otters was low (0.72). The density of otters in our study area (1 otter per 13.4 km of shoreline) was also low, and evidence of a recent genetic bottleneck suggests that otter abundance might have declined prior to our study. River otters in and around Yellowstone Lake appear to be responding to reductions in cutthroat trout via changes in distribution, diet, and possibly survival and abundance. Our results provide a baseline estimate for monitoring the broader outcome of management efforts to conserve native cutthroat trout and emphasize the indirect ecosystem consequences of invasive species.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biological Conservation - Volume 191, November 2015, Pages 596-605
نویسندگان
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