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Turbidity and Nutrients Drive Species-Specific Responses of Freshwater Plankton in Mesocosms.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Turbidity and Nutrients Drive Species-Specific Responses of Freshwater Plankton in Mesocosms./
作者:	Ewins, Carolyn Heather.
面頁冊數:	1 online resource (172 pages)
附註:	Source: Masters Abstracts International, Volume: 85-03.
Contained By:	Masters Abstracts International85-03.
標題:	Plankton. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30565919click for full text (PQDT)
ISBN:	9798380264785

Turbidity and Nutrients Drive Species-Specific Responses of Freshwater Plankton in Mesocosms.
Ewins, Carolyn Heather.

Turbidity and Nutrients Drive Species-Specific Responses of Freshwater Plankton in Mesocosms. - 1 online resource (172 pages)

Source: Masters Abstracts International, Volume: 85-03.

Thesis (M.Sc.)--Queen's University (Canada), 2023.

Includes bibliographical references

Freshwater systems are among the most threatened globally despite the important ecosystem services they provide. Among the many ways humans are altering freshwater systems, the impact of elevated turbidity on zooplankton remains relatively understudied, with much research limited to single-species laboratory studies or community-level studies in oligotrophic systems. Nutrients can be delivered to lakes together with sediments, representing a second stressor. I conducted a mesocosm field experiment to explore the independent and interactive effects of increased turbidity and nutrients on freshwater zooplankton and phytoplankton communities. I found that zooplankton and phytoplankton communities changed with both increased turbidity and nutrients, however, I did not detect any interactions between them. As turbidity increased, the abundance of Skistodiaptomus oregonensis, Daphnia mendotae/dentifera, Chydorus sphaericus, and Alonella increased, whereas Daphnia pulex/pulicaria, Monostyla, and total rotifer abundance declined, with no change in total zooplankton abundance, biomass, richness, and diversity. Cryptophyte concentration, a highquality food source for zooplankton, declined with increasing turbidity, however total chlorophyll a concentration did not change due to stable cyanobacteria and golden-brown algae concentrations. Total zooplankton abundance, richness, total cladoceran, Chydorus sphaericus, and Alonellaabundance, and cyanobacteria concentration declined, whereas golden-brown algae concentration increased with increasing total phosphorus (TP). Dissolved oxygen concentrations declined with increasing TP, suggesting zooplankton abundances were controlled by stressful low-oxygen conditions. By finding different and milder impacts of turbidity on zooplankton communities compared to previous studies, my results contribute to our understanding of turbidity as an aquatic stressor in different contexts. My findings suggest that a species-rich and likely more genetically diverse zooplankton community in eutrophic conditions may be more resilient to increased turbidity. However, important zooplankton and phytoplankton taxa still declined with elevated turbidity and nutrients, indicating that we should aim to manage and limit further turbidity and nutrient increases to protect and maintain our lakes.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798380264785Subjects--Topical Terms:

1299572
Plankton.
Index Terms--Genre/Form:

542853
Electronic books.

Turbidity and Nutrients Drive Species-Specific Responses of Freshwater Plankton in Mesocosms.
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