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On a Razor's Edge : = Maintaining Lake Ecosystem Services and Functions in an Extreme World.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	On a Razor's Edge :/
其他題名:	Maintaining Lake Ecosystem Services and Functions in an Extreme World.
作者:	Armstrong, Margaret Rose.
面頁冊數:	1 online resource (185 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
Contained By:	Dissertations Abstracts International84-05B.
標題:	Plankton. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29877819click for full text (PQDT)
ISBN:	9798352979235

On a Razor's Edge : = Maintaining Lake Ecosystem Services and Functions in an Extreme World.
Armstrong, Margaret Rose.

On a Razor's Edge :Maintaining Lake Ecosystem Services and Functions in an Extreme World. - 1 online resource (185 pages)

Source: Dissertations Abstracts International, Volume: 84-05, Section: B.

Thesis (Ph.D.)--Wageningen University and Research, 2022.

Includes bibliographical references

The delineation of the current geological epoch as the "Anthropocene," derived from the prefix "anthro-" meaning "human," aptly summarizes the sheer magnitude in which humans have affected the biosphere. For many ecosystems, these pressures have caused long-term degradations to their health and functions. Freshwater systems such as lakes are particularly susceptible as these lentic water bodies act as sentinels of change in the region by accumulating information from the whole catchment. With pressures from anthropogenic actions and climatic scenarios projected to continue, if not intensify, in the coming decades, there is concern regarding the impairment of lake ecosystems.Of the climatic projections, one of the more recent concerns is the intensifying frequency and severity of extreme climatic events ("ECEs"), or a climatic event such as a heatwave or precipitation that is in the tail ends (e.g. 99th percentile) of the distribution curve for that region or time of year. The potential for these events to instigate disproportionate disruptions within freshwater systems worldwide can be significant. Paired with other, non-climatic pressures derived from human actions, such as wide-spread land use change and pandemic outbreaks, there can be multiple pressures affecting the biosphere sequentially or in tandem. Depending upon the nature of the pressure, these can be categorized as "pulse" stressors which are generally short-lived events, such as heatwaves or extreme precipitation, and "press" stressors which have a long-lasting or chronic duration, such as ecosystem alterations (e.g. urbanization, dam construction, etc.) or climate change.Degradation of systems presents challenges not only for the biosphere itself but for human communities as our livelihoods are tied to and built upon the functions and values that the biosphere provides. If the trend of increasing pressures is permitted to continue without intervention, human health, well-being and economies could be impacted just as much as the ecosystem inhabitants. With lakes being the abundantly utilized and vulnerable systems that they are, approaching these multifaceted problems will require looking beyond just the science sector to address present and future challenges.In this thesis, the research traces the cause-effect relationship from 1) the occurrence of extreme event(s) to 2) their implications on ecosystem functions to 3) the effect on ecosystem service provisioning and 4) the implications that intersectoral collaborations could have on ecosystem remediation. This is conducted through an interdisciplinary approach with each chapter tackling various aspects of this cause-effect chain.chapter two investigated the implications of individual and coinciding climatic stressors through a full-factorial microcosm experiment (cause-effect chains aspects 1 and 2). The applications of a warming event (press pressure), a precipitation event (pulse pressure) and a combination of both were measured against the reactions of a phytoplankton community comprised of Anabaena flos-aquae (cyanobacterium), Chlorella vulgaris (green alga) and Synedra (diatom). Within the microcosms, the individual warming treatment resulted in the anticipated outcome of the cyanobacterium becoming the dominant species. The precipitation event, in contrast, had a short-lived transient effect on phytoplankton abundance. Finally, the combined treatment of a warming event and a precipitation event yielded an overall effect that was less than that observed with the individual events. This situation of a coinciding event did not have the additive, multiplicative or synergistic effect that was anticipated via significant increases in the phytoplankton community. The design of the experiment was based upon average Dutch summer conditions, including the algal community composition and the climatic treatments that were applied. While the subsequent results from this experiment cannot be directly translated into similar lake systems, the outcome provides insights into mechanisms wherein lake systems experience mitigating effects when coinciding pressures were applied.

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

Mode of access: World Wide Web

ISBN: 9798352979235Subjects--Topical Terms:

1299572
Plankton.
Index Terms--Genre/Form:

542853
Electronic books.

On a Razor's Edge : = Maintaining Lake Ecosystem Services and Functions in an Extreme World.
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