کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5741581 1617118 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Research paperLand cover disturbance homogenizes aquatic insect functional structure in neotropical savanna streams
ترجمه فارسی عنوان
اختلال در پوشش زمین، ساختار عملکردی حشرات آبزی را در جریانهای آبهای نئوتروپیک هماهنگ می کند
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


- We assessed the influence of human-induced disturbances on the functional structure of neotropical aquatic invertebrates.
- Aquatic assemblages were highly specialized in least-diturbed sites and functional homogenized in most-disturbed sites.
- Functional structure was more reliable than taxonomic composition in the assessment of the effects of human disturbances.
- Riparian canopy cover was the main driver of the functional structure of least-disturbed sites.

By modifying local habitat conditions, the alteration of land cover can result in severe faunal impairment, subsequently affecting ecosystem functioning. We analyzed changes in the composition of Ephemeroptera, Plecoptera and Trichoptera (EPT) assemblages along a gradient of human disturbance intensity in 66 neotropical savanna headwater stream sites. Whereas EPT genus richness did not differ among the levels of disturbance, functional richness and diversity significantly decreased from least- to highly disturbed sites. Using a combination of RLQ and fourth-corner analyses, we found that 12 of 28 trait categories were significantly associated with changes in catchment land use and cover intensity, local physical habitat, and water quality. EPT assemblages in least-disturbed sites were characterized by higher proportions of large body size and low body flexibility with <1 reproductive cycle per year, case building, and climbing functional traits. In addition, disturbed sites demonstrated high assemblage functional homogenization compared with least disturbed sites. To our knowledge, this study is the first that examines the response of invertebrate functional structure along a gradient of human disturbance at a large spatial scale in the Neotropics. In doing so, we demonstrate the applicability of multiple trait-based approaches and the higher reliability of functional structure in comparison to taxonomic composition for assessing the effects of human disturbances in neotropical streams.

196

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Indicators - Volume 84, January 2018, Pages 573-582
نویسندگان
, , ,