The impact of extreme turbidity events on the nursery function of a temperate European estuary with regulated freshwater inflow

González‐Ortegón, Enrique; Subida, María Dulce; Cuesta, José A.; Arias, Alberto M.; Fernández-Delgado, Carlos; Drake, Pilar

doi:10.1016/j.ecss.2010.01.013

Cited by 60 publications

(36 citation statements)

References 72 publications

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“…High turbidity from anthropogenic sources limits light availability for photosynthesis and has significant negative impacts on aquatic fauna (Baoligao et al 2016;Gonzalez-Ortegon et al 2010;Hasenbein et al 2013;Kimbell & Morrell 2015;Madhu et al 2010). In the present study, turbidity was high at stations 1, 5, 6 and 7 (Figure 3).…”

Section: In-situ Parametersmentioning

confidence: 56%

Assessment of the Water Quality of Batang Rajang at Pelagus Area, Sarawak, Malaysia

Ling¹,

Soo²,

Phan³

et al. 2017

JSM

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Section: In-situ Parametersmentioning

confidence: 56%

Assessment of the Water Quality of Batang Rajang at Pelagus Area, Sarawak, Malaysia

Ling¹,

Soo²,

Phan³

et al. 2017

JSM

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“…1), which acts as a weir and is particularly relevant during the summer period . Although the dam can provide a relatively stable flow in summer, large discharges in spring linked to high precipitation can negatively affect anchovy estuary occupancy (Drake et al, 2007;González-Ortegón et al, 2010), with consequences for the stock (Ruiz et al, 2009). On the other hand, age-0 recruitment appears to depend both on wind transport, river discharge and fishing intensity (Ruiz et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Daily otolith growth and ontogenetic geochemical signatures of age-0 anchovy (Engraulis encrasicolus) in the Gulf of Cádiz (SW Spain).

et al. 2014

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The European anchovy fishery in the Gulf of Cádiz (ICES Division IXa South) is largely influenced by age-0 individuals. Knowledge of young-of-the-year-growth dynamics is crucial for management, yet data on daily growth are lacking in the area. Linking growth patterns to the environment requires information on habitat occupancy through ontogeny of the fish that reach the fishery, as anchovy use different areas of the Gulf and the Guadalquivir Estuary throughout development. We describe the growth dynamics of age-0 anchovy through otolith microstructure analysis, and couple these data with data on microchemical signals in the otoliths to shed light into habitat use and growth dynamics in the area. Age-0 anchovy captured in September 2011 in the Gulf ranged from 3 to 6 months old for similar sizes, with average growth rates varying twofold. Individual non-linear growth curves showed that maximum otolith growth was positively correlated with the date of spawing. There was no correlation between growth parameters and body length or condition (Fulton K) at capture. The strontium:calcium (Sr/Ca) and magnesium:calcium (Mg/Ca) ratios were significantly lower at the edge of the otolith (approximately the age of capture) than at ages corresponding to larval and early juveniles (<60 days old), but values fell within typical estuarine-dwelling species values. The barium:calcium ratio (Ba/Ca) increased significantly at the edge of the otolith, which possibly resulted from residing in highly productive coastal waters or from ontogenetic effects. The variance in otolith elemental ratios was larger at otolith back-calculated ages around 50 days old, an age that coincides with the presumed closer dependence of estuarine waters. Our data are a first step towards understanding the contribution of the estuarine system to the anchovy fishery in the Gulf. The limitations of the approach and future steps are discussed.

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“…Despite its socio-economic and environmental significance and its impact on shelf ecosystems, there is a surprising lack of scientific and technical information on the Guadalquivir estuary. Most research has studied its hydrological description [Vanney, 1970], the impact of extreme natural events [González-Ortegón et al, 2010], and the effect of the Aznalcóllar mine spill [Grimalt et al, 1999] on the biota and primary production. In contrast, only a few research studies (mostly in Spanish) have focused on hydrodynamic aspects [Álvarez et al, 2001] and have analyzed the flow regimes, based on bed forms [Costa et al, 2009].…”

Section: Introductionmentioning

confidence: 99%

Tide transformation in the Guadalquivir estuary (SW Spain) and process‐based zonation

et al. 2012

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[1] This study analyzes tide transformation in the Guadalquivir estuary (SW Spain). When fresh water discharges are less than 40 m 3 /s, the estuary is tidally-dominated (flood-dominated) and well mixed. Under such conditions, the estuary can be divided into three stretches, each characterized by a different tide propagation process. In the first stretch of 25 km, the dominant process is diffusion. In the next stretch, approximately over 35 km length, convergence and friction processes are in balance. At the head of the estuary, in the last stretch, the tidal motion is partially standing because of tidal reflection on the Alcalá del Río dam, located 110 km upstream from the estuary mouth. The reflection coefficient R varies with the frequency; for diurnal constituents its magnitude |R D | is 0.25; this value increases in the case of semi-diurnal (|R S | ≈ 0.40), and quarter-diurnal constituents (|R Q | ≈ 0.65), and reaches its minimum at the sixth-diurnal components (|R X | ≈ 0.10). The tidal reflection can generate residual currents that have consequences in the bed morphology. Furthermore, when the fresh water discharges are greater than 400 m 3 /s, the estuary is fluvially-dominated and the water level can be calculated as the linear superposition of tide and river contributions. However, superposition arguments do not hold for currents at any point in the estuary.

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The impact of extreme turbidity events on the nursery function of a temperate European estuary with regulated freshwater inflow

Cited by 60 publications

References 72 publications

Assessment of the Water Quality of Batang Rajang at Pelagus Area, Sarawak, Malaysia

Assessment of the Water Quality of Batang Rajang at Pelagus Area, Sarawak, Malaysia

Daily otolith growth and ontogenetic geochemical signatures of age-0 anchovy (Engraulis encrasicolus) in the Gulf of Cádiz (SW Spain).

Tide transformation in the Guadalquivir estuary (SW Spain) and process‐based zonation

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