Buoyancy measurements and vertical distribution of eggs of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus)

Coombs, S. H.; Boyra, Guillermo; Rueda, L. D.; Uriarte, Andrés; Santos, M.B.; Conway, D. V. P.; Halliday, N. C.

doi:10.1007/s00227-004-1389-4

Cited by 54 publications

(79 citation statements)

References 19 publications

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“…The observed lower density of eggs of S. aurita would allow them to develop at slightly higher temperatures than those of the anchovy, in more favourable conditions for a species characteristically from warm waters. Although no references have been found concerning the vertical distribution of S. aurita eggs, the concentration of anchovy eggs in the pycnocline has been reported by Motos & Coombs (2000) and Coombs et al (2004) in the Cantabrian Sea (south of the Gulf of Biscay) at similar densities to those detected in the present work. Olivar et al (2001), in a study carried out in the NW Mediterranean, indicated that anchovy eggs were largely found in the upper 10 m, clearly above the pycnocline.…”

Section: Discussionsupporting

confidence: 81%

Vertical distribution of early developmental stages in two coexisting clupeoid species, Sardinella aurita and Engraulis encrasicolus

Sabatés¹,

Zaragoza²,

Castro³

et al. 2008

Mar. Ecol. Prog. Ser.

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In recent years a northward expansion of Sardinella aurita has been reported in the western Mediterranean. Considering the coexistence of its larvae with those of the dominant species Engraulis encrasicolus, the present study was conducted to compare their vertical distributions in 2 areas off the Catalan coast with different vertical environmental conditions. During summer, the water column was stratified with a deep chlorophyll maximum (DCM) beneath the pycnocline. However, the southern area, under the influence of the Ebro River, was characterized by a secondary surface chlorophyll maximum. Vertical distribution of larval food, nauplii and copepodites showed good agreement with the high chlorophyll layers. In the earliest stages of development, larvae of both species remained in the upper levels. From 6 mm standard length on they developed a day/night migratory behaviour to search for food during the day (feeding period). Therefore, in the south, where the abundance of potential food in the upper layers was relatively high, larvae of both species remained in the upper levels during the day. However, in the north, where food was restricted to the DCM, only E. encrasicolus larvae were able to reach these deep levels. The low temperatures (~15°C) detected at the DCM may restrict the vertical migration of S. aurita in accordance with their thermophilic character. This limitation might represent a restriction for the northward expansion of this species in the western Mediterranean.

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Section: Discussionsupporting

confidence: 81%

Vertical distribution of early developmental stages in two coexisting clupeoid species, Sardinella aurita and Engraulis encrasicolus

Sabatés¹,

Zaragoza²,

Castro³

et al. 2008

Mar. Ecol. Prog. Ser.

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“…In Peruvian waters, Gorbunova et al (1986) found for S. sagax a shallow distribution in the coastal area but a deep distribution, even more so that in this study, in open ocean waters under conditions of convergent currents. E. encrasicolus eggs, all of them collected in the region of coastal upwelling, showed a pattern of vertical distribution similar to that observed for this species in the NE Atlantic ocean (Coombs et al 2004), and the NW Mediterranean (Palomera 1991;Olivar et al 2001) and Adriatic (Regner 1972;Coombs et al 1997;Coombs et al 2003) seas. The near-surface concentration of anchovy eggs has been related to the spawning location of this species in the water column (Olivar et al 2001).…”

Section: Larval Vertical Distributionssupporting

confidence: 67%

Vertical distribution of fish larvae in the Canaries-African coastal transition zone in summer

2006

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This study reports the vertical distribution of fish larvae during the 1999 summer upwelling season in the Canaries-African Coastal Transition Zone (the Canaries-ACTZ). The transition between the African coastal upwelling and the typical subtropical offshore conditions is a region of intense mesoscale activity that supports a larval fish population dominated by African neritic species. During the study, the thermal stratification extended almost to the surface everywhere, and the surface mixed layer was typically shallow or non-existent. Upwelling occurred on the African shelf in a limited coastal sub-area of our sampling. The vertical distributions of the entire larval fish population, as well as of individual species, were independent of the seasonal thermocline. Fish larvae and mesozooplankton were concentrated at intermediate depths regardless of the thermocline position, probably because of its weak signature and spatial and temporal variability. Day/night vertical distributions suggest that some species did not perform diel vertical migration (DVM), whereas others showed either type I DVM or type II DVM. The opposing DVM patterns of different species compensate for each other resulting in no net DVM for the larval fish population as a whole.

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“…The agreement between the two datasets is probably due, in part, to the positive buoyancy of sardine eggs (Coombs et al, 2004), which tend to concentrate in the upper water column and are sampled e¡ectively by the shallow CPR tows.…”

Section: Discussionmentioning

confidence: 94%

distribution and abundance of sardine (sardina pilchardus) eggs in the english channel from continuous plankton recorder sampling, 1958–1980

et al. 2005

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continuous plankton recorder (cpr) samples from the english channel and adjacent celtic shelf, taken over the period 1958–1980, were analysed for sardine (sardina pilchardus) eggs. results showed the progression of sardine spawning along the english channel from west to east from march to august and a return from east to west from september to november. this corresponds with the two seasonal peaks of sardine egg abundance in the western channel: the main summer peak being in may/june, with a smaller autumn peak in october/november. long-term changes in sardine egg abundance in cpr samples showed a decline in summer spawning from the late 1960s, but no clear trend in autumn-spawned egg abundance. similar patterns were observed in the numbers of sardine eggs sampled by conventional plankton net tows at the time-series station l5 off plymouth. this supports the use of the longer time-series of sardine egg data at l5 as being representative of a wider area and emphasizes the importance in continuation of the l5 time-series.

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Buoyancy measurements and vertical distribution of eggs of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus)

Cited by 54 publications

References 19 publications

Vertical distribution of early developmental stages in two coexisting clupeoid species, Sardinella aurita and Engraulis encrasicolus

Vertical distribution of early developmental stages in two coexisting clupeoid species, Sardinella aurita and Engraulis encrasicolus

Vertical distribution of fish larvae in the Canaries-African coastal transition zone in summer

distribution and abundance of sardine (sardina pilchardus) eggs in the english channel from continuous plankton recorder sampling, 1958–1980

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