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Interactions Between Sediment Mechanical Structure and Infaunal Community Structure Following Physical Disturbance.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Interactions Between Sediment Mechanical Structure and Infaunal Community Structure Following Physical Disturbance./
Author:	Clemo, William Cyrus Roger.
Description:	1 online resource (230 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
Contained By:	Dissertations Abstracts International85-05B.
Subject:	Environmental science. -
Online resource:	click for full text (PQDT)
ISBN:	9798380841115

Interactions Between Sediment Mechanical Structure and Infaunal Community Structure Following Physical Disturbance.
Clemo, William Cyrus Roger.

Interactions Between Sediment Mechanical Structure and Infaunal Community Structure Following Physical Disturbance. - 1 online resource (230 pages)

Source: Dissertations Abstracts International, Volume: 85-05, Section: B.

Thesis (Ph.D.)--University of South Alabama, 2023.

Includes bibliographical references

Shallow, river-influenced coastal sediments are important for global carbon storage and nutrient cycling and provide a habitat for diverse communities of invertebrates (infauna). Elevated bed shear stress from extreme storms can resuspend, transport, and deposit sediments, disrupting the cohesive structure of muds, and sorting and depositing sand eroded from beaches. These physical disruptions can also resuspend or smother infauna, decreasing abundances and changing community structure. Infaunal activities such as burrowing, tube construction, and feeding can impact sediment structure and stability. However, little is known about how physical disturbance impacts short and long-term sediment habitat suitability and whether disturbance-tolerant infauna influence sediment restabilization and community recovery. This dissertation investigated how infaunal communities recover following physical disturbance. Temporal changes to the geological and geotechnical structure of muds following manipulated resuspension were assessed in a laboratory experiment. Growth of small-bodied infauna delayed sediment restabilization by increasing erosion and reducing sediment bulk density but increasing cohesion. The remainder of this dissertation investigated short and long-term changes to infaunal community and sediment structure at 5-20 m depths in the northern Gulf of Mexico following Hurricanes Sally and Zeta (2020). A field survey was conducted to assess sediment structure and infaunal community structure before and after the storms. Substantial site-to-site variability in post-storm sediment property changes was consistent with flow interactions driven by local bathymetry leading to sand transport to some sites and near-surface fine sediment loss or little change at other sites. However, despite the variability in hurricane-induced sedimentary changes and persistence of post-storm impacts 8 months after Sally, there were few direct impacts on infaunal abundance, diversity, or community similarity that were consistent with the magnitude of sedimentary change. The lack of direct storm impacts to infauna may have resulted from a combination of pre-Sally disturbances, seasonal infaunal dynamics, and most taxa being tolerant of dynamic river-influenced coastal sediments. Linking infaunal community structure and sediment structure changes over time after extreme storms is important for understanding sediment stability and transport dynamics in frequently disturbed coastal sediments, especially because storm intensity is expected to increase with climate change.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380841115Subjects--Topical Terms:

1179128
Environmental science.
Subjects--Index Terms:

DisturbanceIndex Terms--Genre/Form:

554714
Electronic books.

Interactions Between Sediment Mechanical Structure and Infaunal Community Structure Following Physical Disturbance.
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