کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4390720 | 1305190 | 2009 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of dredged material disposal on benthic macrofauna near Itajaà Harbour (Santa Catarina, South Brazil)
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
From July 2006 to November 2007 the effects of sediment disposal on a macrobenthic association were evaluated at the dredged material disposal site, located 3 km northeast of Itajaà Harbour navigation channel. Seven sample sites were chosen, five inside the licensed disposal area and two outside. Five samples were collected from each site with a 0.042 m2 Van-Veen grab. Nine sampling campaigns took place, one before, one during, and seven after the disposal operations. Evaluations were carried out through sediment and macrofauna composition analysis. An increase in coarse fractions of sediments was found during the first months, mainly within the licensed disposal area. Sites outside the area kept the same granulometric characteristics. Nested ANOVA showed that abundance, taxa richness and Shannon-Weaver diversity were significantly smaller after the disposal, and recovered the initial mean values after the disposal ends. PERMANOVA showed a high heterogeneity between the sites. It decreased until the fifth month after disposal operations, mainly in the sites inside the licensed area. These sites were characterized by low abundance and high variability among the samples. Eight to 16 months after disposal sites recovered their heterogeneity, indicating less variability among the samples of each site and distinct benthic macrofaunal composition. The high volume and frequency of sediment disposal were the main factors of environmental modifications, since the amount of deposited sediment on the seabed probably exceeded the natural sedimentation rates. The presence of a benthic macrofauna adapted to natural/human disturbances was crucial to the fast recovery verified in the area.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 35, Issue 10, October 2009, Pages 1435-1443
Journal: Ecological Engineering - Volume 35, Issue 10, October 2009, Pages 1435-1443
نویسندگان
Jorge Matheus Vivan, Maikon Di Domenico, Tito Cesar Marques de Almeida,