Plankton communities and physical oceanography observed on the Southeast Shoal region, Grand Bank of Newfoundland

Anderson, JT; Gardner, Grant A.

doi:10.1093/plankt/8.6.1111

Cited by 24 publications

(9 citation statements)

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“…Some suggestion of the latter is apparent in Anderson and Gardner's (1986) observations which show nutrients from the (eastern) Bank edge extending onto the Shoal below the thermocline and associated enhanced chlorophyll concentrations in the lower layer.…”

Section: Discussionmentioning

confidence: 99%

Summertime Bottom Temperatures on the Southeast Shoal of the Grand Bank, and Implications for Exchange Rates

Loder¹

1991

Can. J. Fish. Aquat. Sci.

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Lesder, 1. W. 1991 . Summertime bottom temperatures on the Southeast Shoal of the Grand Bank, and implications for exchange rates. Can. 1. Fish. Aquat. Sci. 48: 131 6-1 3 2 5 .From spring to fall, the Southeast Shoal usually has the warmest bottom water s n the entire Grand Bank s f Newfoundland. Historical hydrographic data indicate that the elevated lower-layer temperatures are derived from the seasonal surface heat input, through vertical exchange across the developing thermocline in combination with the shallow depths of the Shoal. However, in some months, the surface fluxes required by the monthly changes in depth-integrated heat content over the Shoal exceed el irnatological flux estimates computed using bulk formulae, suggesting that the climatoDogical estimates may be low. The seasonal evolution of the lowerlayer temperature provides information on the rates of vertical exchange across the thermocline and horizontal exchange in the lower layer. A seasonal variation in the vertical exchange coefficient, with an approximately inverse relation to the vertical density difference, and significant horizontal exchange in summer are suggested. The associated rates are quantified with a crude axisyrnrnetric model for the lower layer's monthly heat budget.Bu printemps h I'automne, c'est g6nkralement sur le Platier que I'on observe I'eau de fond la plus chaude sur l'ensemble du Grand Bawc de Pere-Neuve. Les donnees hydrographiques recueillies depkeis longtemps indiqkeent que les ternp6ratures eIev6es de la couche inferieure sont caus6es par I'apport saisonnier de chalekgr superficielle, dO 3 B16change vertical au travers de la thermocline qui se dkveloppe, et 2i la faible prsfondeur de ce banc.Toutefois, pendant certains mois, les flux superficiels nkcessaires pour justifier les changements mensuels dans le bilan therrnique integr6 sur la profondeur au-dessus du banc depassent les estimations des flux climatologiques calcul6s 2i I'aide de formules globales, ce qui indiquerait que ces estimations sont peut-Gtre trop faibles. L'6vo-lution saisonni5re de la tempkrature dans la couche inf6rieure donne de I'information sur les taux d'echange vertical en travers de la thermocline et d'kchange horizontal dans la cokeche inferieure. I 1 semblerait exister une variation saisonniere du coefficient dr6change vertical, avec une relation apprsxirnativement inverse 2 la diff6-rence dans la densit6 verticale, et un important echange horizontal en 6t6. Les taux connexes sont quantifies par un rnodele axisymktrique grossier d6crivant le bilan therrnique mensuel de la couche inf6rieure.

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Section: Discussionmentioning

confidence: 99%

Summertime Bottom Temperatures on the Southeast Shoal of the Grand Bank, and Implications for Exchange Rates

Loder¹

1991

Can. J. Fish. Aquat. Sci.

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“…This is most evident from the maximum concentration values for the number of species and individuals recorded over the edge of the shelf. Frontal structures of this kind also generate larval concentrations in other regions, such as over the Grand Bank off Newfoundland (Anderson & Gardner 1986) or the North Sea ( f i~r b o e et al. 1988).…”

Section: Discussionmentioning

confidence: 99%

Distribution pattern of larval fish populations in the Northwestern Mediterranean

Sabatés¹

1990

Mar. Ecol. Prog. Ser.

117

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Spatiotemporal distribution patterns in the larval fish community were studied off the Catalan coast (NW Mediterranean) between April and October 1983. Important seasonal variations in species composition were detected. The causes of this temporal heterogeneity lay in the species richness of the area and the spawning periods of adults. Spatial heterogeneity depended on the combined effects of topography and hydrographic features of the reglon. The existence of a shelf-slope front along the shelf break was one of the most important factors and was associated with maximum larval abundance. The current running along the coast from north to south together with the diversity of bottom structure and type also made major contributions to spatial heterogeneity. Four distinct geographical zones coinciding with bottom features were differentiated by statistical analysis. The species groups defining these 4 zones largely coincided with habitat and behaviour of the adults. However, with the diversity of features of the regon, the species were not limited solely to a single assemblage, giving rise to a gradation rather than to well-defined associations.

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“…While starving, emaciated, and dead larvae have been found in the ocean (Soleim 1942, Shelbourne 1957, Wiborg 1976, O'Connell 1980, Theilacker 1986, other researchers have found no evidence of starvation, no period that is detrimental to survival, and no inter-or intra-annual variation in larval condition (Vilela & Zijlstra 197 1, Walline 1985). The CO-occurrence of larvae and their prey is frequently well defined (Blaxter 1965, O'Connell 1980, Frank & Leggett 1982, Fortier & Leggett 1984, but is equally not well defined (Grauman 1973, Iles & Sinclair 1982, Gadomslu & Boehlert 1984, Houde & Lovdal 1984, O'Boyle et al 1984, Sinclair et al 1985, Ware & Lambert 1985, Anderson & Gardner 1986, Taggart & Leggett 1987a. Furthermore, the interpretation of the results of some studies concerned with the sympatry of larvae and their food has recently been challenged (Frank 1988).…”

Section: Quebec)mentioning

confidence: 99%

Short-term mortality in post-emergent arval capelin Mallotus villosus. II. Importance of food and predator density, and density-dependence

Taggart¹,

Leggett²

1987

Mar. Ecol. Prog. Ser.

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Analysis of post-emergent larval capehn Mallotus r/lllosus density in a small embayment in eastern Newfoundland durlng 1981 to 1983 demonstrated that as samphng scales approached those relevant to the larvae (ca 2 h 200 to 400 m) the degree of positive association between mlcrozooplankton and larvae decreased Forty sequential estimates of post-emergent larval mortality were not slgnlflcantly correlated wlth either the density of edible microzooplankton (90 to 130 um size-classes) the density of potential predators (chaetognaths and lellyflsh) or the density of other macrozooplankton Correlations wlth potential predator densities whlle insignificant, were positive We suggest that posltive correlations between predator denslty and mortallty are more llkely to occur when analysing fleld data that 1s collected near-instantaneously because of the near-instantaneous effect predators have on population losses relative to the longer-term cumulative effects that result from food hmltation (starvation) There was no significant relation between larval density and larval mortallty and the hypothesis of density-dependent short-term mortality in post-emergent larvae was rejected

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Plankton communities and physical oceanography observed on the Southeast Shoal region, Grand Bank of Newfoundland

Cited by 24 publications

References 0 publications

Summertime Bottom Temperatures on the Southeast Shoal of the Grand Bank, and Implications for Exchange Rates

Summertime Bottom Temperatures on the Southeast Shoal of the Grand Bank, and Implications for Exchange Rates

Distribution pattern of larval fish populations in the Northwestern Mediterranean

Short-term mortality in post-emergent arval capelin Mallotus villosus. II. Importance of food and predator density, and density-dependence

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