کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5757808 1412735 2017 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Detecting, sourcing, and age-dating dredged sediments on the open shelf, southern California, using dead mollusk shells
ترجمه فارسی عنوان
تشخیص، استخراج و رسوبات زراعی قدیم در قفسه باز، جنوب کالیفرنیا، با استفاده از پوسته مرغ مرغوب
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی
Molluscan shell debris is an under-exploited means of detecting, sourcing, and age-dating dredged sediments in open-shelf settings. Backscatter features on the Southern California shelf are suggestive of dredged sediment hauled from San Diego Bay but deposited significantly inshore of the EPA-designated ocean disposal site. We find that 36% of all identifiable bivalve shells > 2 mm (44% of shells > 4 mm) in sediment samples from this 'short dump' area are from species known to live exclusively in the Bay; such shells are absent at reference sites of comparable water depth, indicating that their presence in the short-dump area signals non-compliant disposal rather than natural offshore transport or sea level rise. These sediments lack the shells of species that invaded California bays in the 1970s, suggesting that disposal preceded federal regulations. This inexpensive, low-tech method, with its protocol for rejecting alternative hypotheses, will be easy to adapt in other settings.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Pollution Bulletin - Volume 114, Issue 1, 15 January 2017, Pages 448-465
نویسندگان
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