Eylem Seç
Effects of Agricultural Tile Drainage on Wetland Habitats and Species
Başlık:
Effects of Agricultural Tile Drainage on Wetland Habitats and Species
Yazar:
Davis, Drew R., author.
ISBN:
9780438078789
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (216 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: Jacob L. Kerby Committee members: Mark D. Dixon; Meghann E. Jarchow; David L. Swanson; Jamie Voyles.
Özet:
The number of wetlands across the United States has decreased dramatically over the past 200 years, and as a result, it is important to ensure that remaining wetlands serve as high quality habitats. In agricultural landscapes, tile drains transport water from agricultural fields into nearby wetlands. To better understand how tile drain effluent affects wetlands, I worked with partners who measured contaminants and water quality directly in tile drain effluent (Tile Outfalls), as well as in wetlands that received tile effluent (Tile Wetlands), wetlands that receive direct surface runoff from adjacent row crop agriculture (Surface Wetlands), and wetlands believed to be well buffered by grasslands from agricultural runoff (Reference Wetlands). At these same sites, I evaluated habitat quality and measured aquatic invertebrate and amphibian diversity. Reference Wetlands had lower concentrations of many contaminants and higher habitat quality than Surface or Tile Wetlands. Tile Wetlands had significantly higher concentrations of selenium and chlorophyll-a, cooler water temperatures, and lower pH compared to Surface Wetlands. I detected no difference in amphibian diversity among wetland site categories, but found significantly lower aquatic invertebrate diversity in Tile Wetlands. To better understand effects of contaminants on amphibians, I measured water-borne corticosterone (CORT) release rates and ranavirus infection loads in larval Western Tiger Salamanders from agricultural and reference wetlands. I found that CORT and ranavirus infection were greater in larval salamanders from agricultural wetlands, that CORT was greater in infected individuals, and that CORT was positively correlated with infection load. In order to understand how contaminants and ranavirus affect larval amphibians, I examined main and interactive effects of imidacloprid, selenium, and ranavirus in a 28-d experiment on Boreal Chorus Frog tadpoles. I found negative main and interactive effects of these stressors on tadpole survival and growth, and increased development. Though I observed no differences in amphibian diversity in field surveys, I observed significant effects of contaminants on stress, growth, and development. In sum, these results suggest that tile drain effluent is negatively affecting aquatic invertebrates and amphibians and these effects may manifest in negative effects on food webs and aquatic communities.
Notlar:
School code: 0203
Tüzel Kişi Ek Girişi:
Mevcut:*
Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(695143.1) | 695143-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
On Order
Liste seç
Bunu varsayılan liste yap.
Öğeler başarıyla eklendi
Öğeler eklenirken hata oldu. Lütfen tekrar deneyiniz.
:
Select An Item
Data usage warning: You will receive one text message for each title you selected.
Standard text messaging rates apply.