کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4547977 1627283 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Habitat associations of marbled murrelets during the nesting season in nearshore waters along the Washington to California coast
ترجمه فارسی عنوان
انجمن های حیات وحش درختان سنگ مرمر در طول فصل لانه شدن در آب های ناهره در امتداد ساحل واشنگتن تا کالیفرنیا
کلمات کلیدی
رگرسیون افزایش یافته، غذای مرکزی تغذیه زیستگاه، انتخاب محل سکونت، نقطه نقطه، مرداب مرمر، زیستگاه تودرتو، شمال غربی اقیانوس آرام، ایالات متحده آمریکا، دمای سطح دریا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی


• Marbled murrelet density is highly variable along the Pacific coast but shows at least 3 “hotspots” of exceptional abundance.
• The murrelet is a central place forager and its density is influenced by the amount and pattern of its inland nesting habitat.
• We found that terrestrial covariates had a much stronger influence on murrelet density than marine covariates.
• Model results suggest that conservation of inland nesting habitat is key to the species’ recovery.

The marbled murrelet (Brachyramphus marmoratus) is a seabird in the family Alcidae that forages in nearshore waters of the Pacific Northwest, and nests in adjacent older-forest conifers within 80 km offshore. The species is of conservation concern due to habitat loss and declining numbers, and is listed as Threatened in British Columbia, Canada and in the United States portion of its range south of Canada. Recent monitoring in the United States indicated that murrelet numbers continued to decline there, especially in the waters of Washington State. To better understand this decline, and to inform conservation planning for the species, we evaluated how terrestrial and marine factors influence the distribution and abundance of the murrelet in coastal waters, including whether at-sea hotspots of murrelet abundance exist. Murrelet at-sea abundance and distribution were determined by surveys conducted annually from 2000 to 2012 in coastal waters from the United States–Canada border south to San Francisco Bay. We summarized mean and variance of murrelet density at the scale of 5-km segments of coastal waters throughout this area. We used a boosted regression tree analysis to investigate the contributions of a suite of marine and terrestrial attributes to at-sea murrelet abundance in each segment. We observed several regional hotspots of higher murrelet abundance at sea. Terrestrial attributes made the strongest contribution, especially the amount and cohesiveness of suitable nesting habitat in proximity to each segment, whereas marine attributes explained less of the spatial and temporal variations in murrelet abundance. At-sea hotspots of murrelet abundance therefore reflect not only suitable marine foraging habitat but primarily the proximity of suitable inland nesting habitat.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Marine Systems - Volume 146, June 2015, Pages 17–25
نویسندگان
, , , ,