کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6305638 | 1618576 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Anthropogenic land-use signals propagate through stream food webs in a California, USA, watershed
ترجمه فارسی عنوان
سیگنال های استفاده انسانی از زمین از طریق شبکه های غذای جریان در یک حوزه آبریز کالیفرنیا، ایالات متحده آمریکا پخش می شود
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کلمات کلیدی
آلیاژی آمار بیزی، نیتروژن، آلودگی بدون نقطه، سیستم های سپتیک، ایزوتوپهای پایدار، کمک مالی،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
چکیده انگلیسی
Human development of watersheds can change aquatic ecosystems via multiple pathways. For instance, human rural development may add nutrients to ecosystems. We used naturally occurring stable isotopes in stream food webs to investigate how land use affects stream ecosystems across a gradient of land development in the San Lorenzo watershed, California. Road density was used as a proxy for land development. We found that streams in watersheds with higher road densities had elevated concentrations of phosphate and nitrate. Furthermore, algal δ15N values increased as a function of nitrate concentration, but saturated at approximately 6â°. This saturating pattern was consistent with a two-source mixing model with anthropogenic and watershed sources, fit using Bayesian model fitting. In sites that had >2.6 km roads kmâ2, anthropogenic sources of N were estimated to represent >90% of the N pool. This anthropogenic N signal was propagated to stream consumers: rainbow trout (Oncorhynchus mykiss), signal crayfish (Pacifasticus leniusculus), and benthic invertebrate δ15N were positively correlated with algal δ15N. Even relatively low density rural human land use may have substantial impacts on nutrient cycling of stream ecosystems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Limnologica - Ecology and Management of Inland Waters - Volume 46, March 2014, Pages 124-130
Journal: Limnologica - Ecology and Management of Inland Waters - Volume 46, March 2014, Pages 124-130
نویسندگان
Jonathan W. Moore, Timothy D. Lambert, Walter N. Heady, Susanna E. Honig, Ann-Marie K. Osterback, Corey C. Phillis, Angela L. Quiros, Nicolas A. Retford, David B. Herbst,