A global assessment of fish estuary associations: A numerical approach to assessing estuary‐associated fish functional guilds

Harrison, Trevor D.; Whitfield, Alan K.

doi:10.1111/faf.12558

Cited by 14 publications

(3 citation statements)

References 63 publications

(115 reference statements)

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“…ac. uk/ doito ol/ data/ 1678 (Elliott et al, 2007;Harrison & Whitfield, 2021). Trophic guild data were classified by referencing the FishBase database, books, and related literature (Elliott et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Trait data were primarily obtained from the FishBase database ( www.fishbase.org ) using the “rfishbase” package (Boettiger et al., 2012 ). EUFG data were sourced from https://www.dassh.ac.uk/doitool/data/1678 (Elliott et al., 2007 ; Harrison & Whitfield, 2021 ). Trophic guild data were classified by referencing the FishBase database, books, and related literature (Elliott et al., 2007 ).…”

Section: Methodsmentioning

confidence: 99%

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Characteristics of demersal fish community structure during summer hypoxia in the Pearl River Estuary, China

Lai,

Bi,

et al. 2024

Ecology and Evolution

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In recent decades, hypoxic areas have rapidly expanded worldwide in estuaries and coastal zones. The Pearl River Estuary (PRE), one of China's largest estuaries, experiences frequent seasonal hypoxia due to intense human activities and eutrophication. However, the ecological effects of hypoxia in the PRE, particularly on fish communities, remain unclear. To explore these effects, we collected fish community and environmental data in July 2021 during the summer hypoxia development period. The results revealed that bottom‐layer dissolved oxygen (DO) in the PRE ranged from 0.08 to 5.71 mg/L, with extensive hypoxic zones (DO ≤ 2 mg/L) observed. Hypoxia has varied effects on fish community composition, distribution, species, and functional diversity in the PRE. A total of 104 fish species were collected in this study, with approximately 30 species (28.6%) exclusively found in hypoxic areas. Species responses to hypoxia varied: species such as Sardinella zunasi, Coilia mystus, and Nuchequula nuchalis were sensitive, while Decapterus maruadsi, Siganus fuscescens, and Lagocephalus spadiceus showed higher tolerance. Within the hypoxia area, dissolved oxygen was the main limiting factor for fish community diversity. Functional diversity (FDiv) decreased with higher dissolved oxygen levels, indicating a potential shift in the functional traits and ecological roles of fish species in response to changing oxygen conditions. Further analysis demonstrated that dissolved oxygen had a significantly stronger effect on fish community structure at hypoxic sites than in the whole PRE. Moreover, other environmental variables also had significant effects on the fish community structure and interacted with dissolved oxygen in the hypoxia area. These findings suggest that maintaining sufficient dissolved oxygen levels is essential for sustaining fish communities and ecosystem health in the PRE. This study provides novel insights into the effects of hypoxia on fish communities in estuarine ecosystems and has significant implications for the ecological health and management of the PRE.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Characteristics of demersal fish community structure during summer hypoxia in the Pearl River Estuary, China

Lai,

Bi,

et al. 2024

Ecology and Evolution

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“…Estuaries exhibit a high variability in environmental conditions arising from their connection to both the sea and rivers, and thus they harbour distinct biodiversities and communities that are adapted to such conditions (Elliott and Quintino, 2007). They furthermore provide habitat to marine organisms that use estuaries as nurseries including commercially important fish and invertebrate species (de Villiers and Hodgson, 1999;Lamberth et al 2009;Harrison and Whitfield, 2021). They improve the water quality of riverine inflow, and feature high productivity.…”

Section: Introductionmentioning

confidence: 99%

How drought affects range and variability of environmental conditions in subtropical South African estuaries

Scharler

Bownes

Jerling

2022

Preprint

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Globally estuaries are under increasing pressure from human development impacts as well as the growing effects of climate change that is already, and increasingly so, causing major changes in events such as droughts. Although droughts are regular occurrences and are projected to become progressively more significant in many parts of the world, their potential impacts on estuaries requires better understanding and quantification. This study aims to quantify environmental and phytoplankton parameter changes in two contrasting subtropical estuary types in South Africa; the temporarily closed uMdloti Estuary and the predominantly open to the sea uMlalazi Estuary during a hydrological drought event and subsequent non-drought period. Drought caused lower salinities, almost exclusively freshwater, throughout the temporarily closed estuarine type uMdloti. The marine-estuarine salinity environment of the predominantly open uMlalazi during drought expanded to include lower salinities in the non-drought period. Dissolved oxygen levels were more variable during drought conditions including periods of hypoxia, but more stable at elevated levels in both estuaries during the non-drought period. Temperature measurements included higher values during drought, especially in the dry season. Chl-a concentrations were overall higher and more variable during drought in uMdloti, with periods of bloom formation as well as decay. Drought-induced conditions can span several generations for estuarine and estuarine associated organisms. The results from the study provide quantitative support for the hypothesis that extended periods of drought conditions lead to a decrease in niche availability to estuarine organisms in a range of estuary types.

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A multi-metric fish index to measure the ecological quality of tropical predominantly open estuaries along the western coast of India

Bhavan

Mujawar

Haragi

et al. 2023

Environ Monit Assess

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A global assessment of fish estuary associations: A numerical approach to assessing estuary‐associated fish functional guilds

Cited by 14 publications

References 63 publications

Characteristics of demersal fish community structure during summer hypoxia in the Pearl River Estuary, China

Characteristics of demersal fish community structure during summer hypoxia in the Pearl River Estuary, China

How drought affects range and variability of environmental conditions in subtropical South African estuaries

A multi-metric fish index to measure the ecological quality of tropical predominantly open estuaries along the western coast of India

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