Transient Coastal Upwelling and Water Circulation in Bantry Bay, a Ria on the South-west Coast of Ireland

Edwards, A.; Jones, Ken; Graham, Jennie; Griffiths, Colin; MacDougall, N; Patching, John W; Richard, J.; Raine, Robin

doi:10.1006/ecss.1996.0016

Cited by 32 publications

(22 citation statements)

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“…Most of the bay averages 30 m in depth, increasing to 70 m near the mouth. Throughout the summer, cyclical coastal upwelling in the bay has been known to drive the development of toxic algal blooms, with shelf waters intruding into the bay on the relaxation of upwelling (Edwards et al 1996). The northern site in Clifden Bay, Connemara (northwest Ireland), is in comparison, a relatively sheltered, shallow bay (maximum depth ~14 m) only 9 km in length.…”

Section: Methodsmentioning

confidence: 99%

Gill disorders in marine-farmed salmon: investigating the role of hydrozoan jellyfish

Baxter¹,

Rodger²,

McAllen³

et al. 2011

Aquacult. Environ. Interact.

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Jellyfish have been implicitly linked to a number of fish kill events in marine-farmed finfish over recent decades. However, due to insufficient data, it is difficult to identify small hydrozoan jellyfish as the causative agents of the more common and chronic problem of gill disorders. Gill disorders (physical, pathogenic or parasitic damage to the gills) can be caused by a number of waterborne agents and are an increasing though poorly understood problem for the aquaculture industry. Hence, the first year-long monitoring programme to study hydrozoan jellyfish, other gelatinous zooplankton, phytoplankton and fish health was initiated at 2 aquaculture sites on the west coast of Ireland. At the southern site, 2 jellyfish species previously implicated in aquaculture fish kill events (Muggiaea atlantica and Solmaris corona) occurred at high abundances (combined density of ~450 jellyfish m -3 , an order of magnitude lower than during previous mass mortality events). The fish at this site exhibited clinically significant gill damage throughout the peak in jellyfish abundance. Analyses revealed a significant positive correlation between daily fish mortality and the abundance of these jellyfish but not with any other factors. At the northern site, there were low abundances of jellyfish; nevertheless, gill damage due to the protozoan parasite Trichodina sp. was observed over a shorter time period. As the European aquaculture sector experiences annual economic losses due to gill disorders, these findings raise concerns for the expected growth of the industry, especially as jellyfish populations are predicted to increase in some areas. Therefore, mitigation methods need to be developed and implemented.

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Section: Methodsmentioning

confidence: 99%

Gill disorders in marine-farmed salmon: investigating the role of hydrozoan jellyfish

Baxter¹,

Rodger²,

McAllen³

et al. 2011

Aquacult. Environ. Interact.

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“…Circulation is thus primarily wind driven; this is also due to the fact that the bay is axially aligned to the predominant wind direction from the southwest (Edwards et al, 1996). When the bay is thermally stratified, variations in wind direction cause two layer oscillatory flows which generally result in the import of water from the near coastal continental shelf containing phytoplankton (Edwards et al 1996), and in general water flushing is in an anticlockwise direction, which has implications for nutrient availability for shellfish culture. Substantial mixing due to this wind driven exchange then prevents any one phytoplankton species dominating the bay (Raine et al, 1993).…”

Section: Study Sitementioning

confidence: 99%

Numerical modelling of spatio-temporal variability of growth of Mytilus edulis (L.) and influence of its cultivation on ecosystem functioning

Dabrowski

Lyons

Cure³

et al. 2013

Journal of Sea Research

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“…It should be noted that in the ADCP current meter was deployed at 40 m depth in the study of the Carter et al, 1979;Walters and Gartner, 1985;Valle Levinson et al, 1998;Wong and Moses-Hall, 1998;Wong and DiLorenzo, 1988;Wong, 2002). The effect of coastal winds is specially relevant in areas affected by permanent or seasonal upwelling, as it is the case of the Galician rías (Rosón et al, 1997;Álvarez-Salgado et al, 2000;Pardo et al, 2001), the Chilean fjords (Aysen Fjord, Cáceres et al, 2002) or Bantry Bay in South West Ireland (Edwards et al, 1996). Similarly high percentages of the subtidal current variability explained by coastal winds have been found in the Ría de Vigo (>65%; Piedracoba et al, 2005), the Ría de Arousa (50%; Rosón et al, 1997) (Rosón et al, 1997;Álvarez-Salgado et al, 2000).…”

Section: Subtidal Circulation Patternsmentioning

confidence: 99%

Net ecosystem metabolism of a coastal embayment fertilised by upwelling and continental runoff

Villegas‐Ríos

Álvarez‐Salgado

Piedracoba

et al. 2011

Continental Shelf Research

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O 2 , N, P and Si net ecosystem metabolism of the Ría de Ares-Betanzos (NW Iberian upwelling system) was estimated during two 3-wk periods of contrasting summer downwelling and autumn upwelling conditions by means of a transient 2-D kinematic box model. The subtidal circulation was positive in both situations, although it was depressed during downwelling and enhanced during upwelling. Concurrently, the ría was fertilised mainly by shelf bottom waters, which introduced from 69% (under downwelling) to almost 100% (under upwelling) of the limiting N nutrients. The ría was an efficient nutrient trap: about 70% of the N nutrients that entered the embayment were retained under downwelling conditions (average flushing time, 9 days) and about 50% under upwelling conditions (average flushing time 3 days). Although the trapping efficiency was lower, the net ecosystem production (NEP) was much higher under upwelling (from 1.0 ± 0.3 to 1.5 ± 0.4 g C m -2 d -1 ), than under downwelling favourable winds (from 0.2 ± 0.1 to 0.3 ± 0.1 g C m -2 ). The stoichiometry of NEP suggests that P and N compounds recycled faster than C compounds, specially in the inner segment of the ría. The net degree of silification was twice in the inner than in the outer segment of the ría.

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Transient Coastal Upwelling and Water Circulation in Bantry Bay, a Ria on the South-west Coast of Ireland

Cited by 32 publications

References 0 publications

Gill disorders in marine-farmed salmon: investigating the role of hydrozoan jellyfish

Gill disorders in marine-farmed salmon: investigating the role of hydrozoan jellyfish

Numerical modelling of spatio-temporal variability of growth of Mytilus edulis (L.) and influence of its cultivation on ecosystem functioning

Net ecosystem metabolism of a coastal embayment fertilised by upwelling and continental runoff

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