Dynamics of the Turbidity Maxima in the Upper Humber Estuary System, UK

Mitchell, Steve; West, John R.; Arundale, A.M.W.; Guymer, I.; Couperthwaite, John

doi:10.1016/s0025-326x(98)00178-7

Cited by 55 publications

(30 citation statements)

References 32 publications

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“…Hidden behind precipitation and wind effects may appear the influence of trophic relationships, reproductive cycles (Keddy and Weiher 1999) and may also a stochastic component (Grossman et al 1982). Moreover, this influence may be modulated by specific variables correlated to the rivers input into the coastal areas, including salinity, river flow (Gillson et al 2012, Mitchell et al 1999, turbidity (Castillo-Rivera et al 2002, Cyrus and Blaber 1987, 1992, Johnston et al 2007, Whitfield 1999 or pollution (Lekve et al 2002). Nevertheless, evidences provided here indicated for consistent seasonal changes determined by precipitation and wind direction/intensity in the distribution and abundance of species within coastal fish assemblages.…”

Section: Discussionmentioning

confidence: 65%

What are the main local drivers determining richness and fishery yields in tropical coastal fish assemblages?

Souza¹,

Batista²,

Fabré³

2018

Zoologia

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ABSTRACT. Seasonal ecological effects caused by temperature and photoperiod are typically considered minimal in the tropics.Nevertheless, annual climate cycles may still influence the distribution and abundance of tropical species. Here, we investigate whether seasonal patterns of precipitation and wind speed influence the structure of coastal fish assemblages and fishing yields in northeast Brazil. Research trips were conducted during the rainy and dry seasons using commercial boats and gear to sample the fish community. Diversity was analyzed using abundance Whittaker curves, diversity profiles and the Shannon index. Principal Component Analysis (PCA) was used to analyze associations between the abundance of species and various environmental variables related to seasonality. A total of 2,373 fish were collected, representing 73 species from 34 families -20 of which were classified as both frequent and abundant. Species richness was greater and more equitable during the rainy season than the dry season -driven by changes in the precipitation rather than to wind speed. Species diversity profiles were slightly greater during the rainy season than the dry season, but this difference was not statistically significant. Using PCA was identified three groups of species: the first associated with wind speed, the second with precipitation, and the third with a wide range of sampling environments. This latter group was the largest and most ecologically heterogeneous. We conclude that tropical coastal fish assemblages are largely influenced by local variables, and seasonally mediated by annual changes related to precipitation intensity and wind speed, which in turn influences fishery yields.

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Section: Discussionmentioning

confidence: 65%

What are the main local drivers determining richness and fishery yields in tropical coastal fish assemblages?

Souza¹,

Batista²,

Fabré³

2018

Zoologia

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“…The sediment transported into the PRE is mainly accumulated from the four river outlets (Hu Men, Jiao Men, Hongqi Men, and Heng Men). The distribution of grain size is controlled by the physical transportation of sediment, including sediment aggregation and deposition, gravitational circulation, tidal pumping, and tidal trapping (Grabemann et al, 1997;Mitchell et al, 1998;Wai et al, 2004). Sediment aggregation and deposition are influenced by current velocity, salinity, and suspended particulate matter in the water column.…”

Section: Physical Transportation Of Trace Metalsmentioning

confidence: 99%

Trace metal distribution in sediments of the Pearl River Estuary and the surrounding coastal area, South China

Zhang

et al. 2007

Environmental Pollution

453

149

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In the present study, surface sediments and sediment cores were collected at the Pearl River Estuary (PRE) and its surrounding coastal area. The samples were analysed for total metal concentrations, metal concentrations in the five operationally defined chemical fractions, and Pb isotopic compositions. The concentrations of Co, Cr, Pb, and Zn of the sediments in the PRE were about twice of those at the adjacent coastal area, while the Cu concentrations of the PRE sediments were four times higher than the sediments at the coastal area. The distribution of Cu, Cr, Pb, and Zn demonstrated a typical diffusion pattern from the land to the direction of the sea. Two hotspots of trace metal contamination were located at the mixed zone between freshwater and marine waters. The distribution of trace metals in sediments showed that the major sources of metal contaminants were probably from the discharges of sewage and other outlets in the west bank of the estuary. The enrichment of metal in the sediments could be attributed to the deposition of the dissolved and particulate trace metals in the water column at the estuarine area. The similar Pb isotopic signatures of the sediments at the PRE and its surrounding coastal area offered strong evidence that the This is the Pre-Published Version.

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“…Many authors have, since then, focused on this theme, most of them dealing with temperate estuarine systems, thus contributing to the understanding of the carbon cycle and the eutrophication process in coastal areas. Knowledge regarding temperate estuaries has been greatly increased by the studies of Mitchell et al (1998), Uncles et al (1998a), Grelowski et al (2000), Jiang et al (2000) and Wu et al (2004).…”

Section: Introductionmentioning

confidence: 99%

Instantaneous transport of salt, nutrients, suspended matter and chlorophyll-a in the tropical estuarine system of Santos

et al. 2005

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A B S T R A C TThe contribution of the polluted São Vicente and Santos estuarine channels to the eutrophication of Santos bay was assessed through the quantification of instantaneous transport of salt, dissolved inorganic nitrogen (DIN) and phosphate, organic and inorganic matter (OSM and ISM) and chlorophyll-a (Chl-a), during dry (austral winter-August/ 1999) and rainy (austral summerJanuary/2000) seasons. Samplings were carried out during spring and neap tides, in flood and ebb phases, in two transversal sections at the mouths of the São Vicente and Santos channels. Instantaneous transport values generally indicated importation of salt to the estuarine channels, exportation of DIN to the bay, mainly as N-NH 4 , at a maximum rate of 1155.1 g s -1 during the rainy season; importation of phosphate during the dry season (maximum of 385 g s -1 ) and exportation of ISM, OSM and Chl-a during periods of greater freshwater discharge. These results demonstrate the great contribution made by the Santos and São Vicente estuaries to the eutrophication of Santos bay, especially in the rainy season. R E S U M OA contribuição dos canais estuarinos de Santos e São Vicente para a eutrofização da baía de Santos foi avaliada quantificando-se o transporte instantâneo de sal, fosfato e nitrogênio inorgânico dissolvido (NID), material em suspensão orgânico (MSO) e inorgânico (MSI) e clorofila-a, durante a estação seca (inverno austral-Agosto/1999) e chuvosa (verão austral-Janeiro/ 2000). As amostragens foram realizadas em períodos de sizígia e quadratura, durante as marés enchentes e vazantes, nas secções transversais das bocas dos canais de São Vicente e Santos. Os valores de transporte instantâneo obtidos durante o período de amostragem indicaram exportação de NID, principalmente sobre a forma de N-NH 4 (valor máximo de 1155,1 g s -1 ) na estação chuvosa; importação de fosfato durante a estação seca (máximo de 385,6 g s -1 ) e exportação de MSI, MSO e clorofila-a em períodos de maior contribuição fluvial. Estes resultados indicam uma importante contribuição dos canais estuarinos de Santos e São Vicente para a eutrofização da baía de Santos, especialmente durante o período chuvoso.

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Dynamics of the Turbidity Maxima in the Upper Humber Estuary System, UK

Cited by 55 publications

References 32 publications

What are the main local drivers determining richness and fishery yields in tropical coastal fish assemblages?

What are the main local drivers determining richness and fishery yields in tropical coastal fish assemblages?

Trace metal distribution in sediments of the Pearl River Estuary and the surrounding coastal area, South China

Instantaneous transport of salt, nutrients, suspended matter and chlorophyll-a in the tropical estuarine system of Santos

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