Scientia Marina, Vol 80, No 4 (2016)

High spatial heterogeneity of two planktonic cnidarian species related to the variability of a shelf-slope front at short time scales

Elena Guerrero
Institut de Ciències del Mar, CSIC , Spain

Anna Marrodán
Institut de Ciències del Mar, CSIC , Spain

Ana Sabatés
Institut de Ciències del Mar, CSIC , Spain

Covadonga Orejas
Institut de Ciències del Mar, CSIC - Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Baleares , Spain

Josep Maria Gili
Institut de Ciències del Mar, CSIC , Spain


We investigated the variability in the mesoscale distribution of the siphonophore Muggiaea atlantica and the hydromedusa Aglaura hemistoma in relation to the rapid spatial oscillations of the shelf-slope front off the Catalan coast (NW Mediterranean). Three extensive surveys were carried out in spring at ten-day intervals. High variability in the position of the front resulted from the advection of low-salinity waters originating in the Gulf of Lions, mainly from the Rhône River runoff. High spatial variability in the distribution of the two species was closely related to the shifting positions of the front. Both species occurred on its inshore side in much higher abundances than on its offshore side, where they were scarce or absent. The front acts as a barrier limiting offshore displacement of these two cnidarians. Statistical analyses showed that bottom depth and salinity, as independent variables, were indicators of the signature and position of the front, explaining most of the variance in the distribution and abundance of the two species.


Siphonophorae; Hydromedusae; Muggiaea atlantica; Aglaura hemistoma; mesoscale; NW Mediterranean

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Alcaraz M., Calbet A., Estrada M., et al. 2007. Physical control of zooplankton communities in the Catalan Sea. Prog. Oceanogr. 74: 294-312.

Alvarez A., Tintoré J., Sabatés A. 1996. Flow modification and shelf-slope exchange induced by a submarine canyon off the northeast Spanish coast. J. Geophys. Res. 101: 12043-12055.

Batisti? M., Kr?ini? F., Jasprica N., et al. 2004. Gelatinous invertebrate zooplankton of the South Adriatic: species composition and vertical distribution. J. Plankton Res. 26: 459-474.

Batisti? M., Jasprica N., Caric M., et al. 2007. Annual cycle of the gelatinous invertebrate zooplankton of the eastern South Adriatic coast (NE Mediterranean). J. Plankton Res. 29: 671-686.

Biggs D.C. 1977. Field studies of fishing, feeding, and digestion in siphonophores. Mar. Behav. Physiol. 4: 261-274.

Blackett M., Licandro P., Coombs S.H., et al. 2014. Long-term variability of the siphonophores Muggiaea atlantica and M. kochi in the Western English Channel. Prog. Oceanogr. 128: 1-14.

Bouillon J., Medel M.D., Pagès F., et al. 2004. Fauna of the Mediterranean Hydrozoa. Sci. Mar. 68(Suppl. 2): 5-438.

Catalano-Balearic Sea - Bathymetric chart. 2005. Available at:

Colin S.P., Costello J.H., Graham W.M., et al. 2005. Omnivory by the small cosmopolitan hydromedusa Aglaura hemistoma. Limnol. Oceanogr. 50: 1264-1268.

Estrada M. 1991. Phytoplankton assemblages across a NW Mediterranean front: changes from winter mixing to spring stratification. In: Ros J.D., Prat N. (eds), Homage to Ramon Margalef; or Why There Is Such Pleasure in Studying Nature, Oecol. Aquat. 10: 157-185. PMCid:PMC1181396

Estrada M., Varela R.A., Salat J., et al. 1999. Spatio-temporal variability of the winter phytoplankton distribution across the Catalan and North Balearic fronts (NW Mediterranean). J. Plankton Res. 21: 1-20.

Fernández E., Cabal J., Acu-a J.L., et al. 1993. Plankton distribution across a slope current-induced front in the southern Bay of Biscay. J. Plankton Res. 15: 619-641.

Flexas M., Durrieu de Madron X., Garcia M., et al. 2002. Flow variability in the Gulf of Lions during the MATER HFF experiment (March-May 1997). J. Mar. Syst. 33: 197-214.

Font J., Salat J., Tintoré J. 1988. Permanent features of the circulation in the Catalan Sea. Oceanol. Acta 9: 51-57.

Font J., Garcia-Ladona E., Gorriz E.G. 1995. The seasonality of mesoscale motion in the Northern Current of the western Mediterranean: several years of evidence. Oceanol. Acta 18: 207-219.

Gili J.M. 1986. Estudio sistemático y faunístico de los cnidarios de la Costa Catalana. Ph.D. thesis. Univ. Autónoma Barcelona, 634 pp.

Gili J.M., Pagès F., Riera T. 1987a. Distribución de las especies más frecuentes de sifonóforos calicóforos en la zona norte del Mediterráneo occidental. Inv. Pesq. 51: 323-338.

Gili J.M., Pagès F., Vives F. 1987b. Distribution and ecology of a population of planktonic cnidarians in the western Mediterranean. In: Bouillon J., Boero F., Cicogna F., et al. (eds), Modern Trends in the Systematics, Ecology, and Evolution of Hydroids and Hydromedusae, Oxford University Press, Oxford, UK; pp. 157-170.

Gili J.M., Pagès F., Sabatés A., et al. 1988. Small-scale distribution of a cnidarian population in the western Mediterranean. J. Plankton Res. 10: 385-401.

Graham W.M., Pagès F., Hamner W.M. 2001. A physical context for gelatinous zooplankton aggregations: a review. Hydrobiologia 451: 199-212.

Greer A.T., Cowen R.K., Guigand C.M., et al. 2015. Fine-scale planktonic habitat partitioning at a shelf-slope front revealed by a high-resolution imaging system. J. Mar. Syst. 142: 111–125.

Guerrero E., Gili J.M., Rodriguez C.S., et al. 2013. Biodiversity and distribution patterns of planktonic cnidarians in San Matías Gulf, Patagonia, Argentina. Mar. Ecol. 34: 71–82.

Houghton R.W. 1997. Lagrangian flow at the foot of a shelfbreak front using a dye tracer injected into the bottom boundary layer. Geophys. Res. Lett. 24: 2035.

Jordi A., Orfila A., Basterretxea G., et al. 2005. Shelf-slope exchanges by frontal variability in a steep submarine canyon. Prog. Oceanogr. 66: 120-141.

Kahru M., Elkenl J., Kotta I., et al. 1984. Plankton distributions and processes across a front in the open Baltic Sea. Mar. Ecol. Prog. Ser. 20: 101-111.

Kr?ini? F., Njire J. 2001. An invasion by Muggiaea atlantica Cunningham 1892 in the northern Adriatic Sea in the summer of 1997 and the fate of small copepods. Acta Adriatica 42: 49-59.

Le Fèvre J. 1986. Aspects of the biology of frontal systems. Adv. Mar. Biol. 23: 163-299.

Licandro P., Iba-ez F. 2000. Changes of zooplankton communities in the Gulf of Tigullio (Ligurian Sea, Western Mediterranean) from 1985 to 1995. Influence of hydroclimatic factors. J. Plankton Res. 22: 2225-2253.

Licandro P., Souissi S., Iba-ez F., et al. 2012. Long-term variability and environmental preferences of calycophoran siphonophores in the Bay of Villefranche (north-western Mediterranean). Prog. Oceanogr. 97-100: 152–163.

Luo J.Y., Grassian B., Tang D., et al. 2014. Environmental drivers of the fine-scale distribution of a gelatinous zooplankton community across a mesoscale front. Mar. Ecol. Prog. Ser. 510: 129-149.

Mackas D.L., Denman K.L., Abbott M.R. 1985. Plankton patchiness: biology in the physical vernacular. Bull. Mar. Sci. 37: 652-674.

Mackie G.O., Pugh P.R., Purcell J.E. 1987. Siphonophore Biology. Adv. Mar. Biol. 24: 97-262.

Mann K.H., Lazier J.R.N. 2006. Dynamics of marine ecosystems: Biological-physical interactions in the oceans. Blackwell Publishing, Boston, 496 pp.

Masó M., Tintoré J. 1991. Variability of the shelf water off the northeast Spanish coast. J. Mar. Syst. 1: 441-450.

Masó M., Sabatés A., Olivar M.P. 1998. Short-term physical and biological variability in the shelf-slope region of the NW Mediterranean during the spring transition period. Cont. Shelf Res. 18: 661-675.

Nagata R.M., Nogueira Júnior M., Brandini F.P., et al. 2014. Spatial and temporal variation of planktonic cnidarian density in subtropical waters of the Southern Brazilian Bight. J. Mar. Biol. Assoc. UK 94: 1387-1400.

Nishikawa J., Tsuda A., Ishigaki T., et al. 1995. Distribution of euphausiids in the Kuroshio front and warm water tongue with special reference to the surface aggregation of Euphausia pacifica. J. Plankton Res. 17: 611-629.

Pagès F., Gili J.M. 1992. Influence of Agulhas waters on the population structure of planktonic Cnidarians in the southern Benguela Region. Sci. Mar. 56: 109-123.

Pagès F., González H.E., Ramón M., et al. 2001. Gelatinous zooplankton assemblages associated with water masses in the Humboldt Current System, and potential predatory impact by Bassia bassensis (Siphonophora: Calycophorae). Mar. Ecol. Prog. Ser. 210: 13-24.

Pavez M.A., Landaeta M.F., Castro L.R., et al. 2010. Distribution of carnivorous gelatinous zooplankton in the upwelling zone off central Chile (austral spring 2001). J. Plankton Res. 32: 1051-1065.

Penston M.J., Millar C.P., Zuur A.F., et al. 2008. Spatial and temporal distribution of Lepeophtheirus salmonis (Krøyer) larvae in a sea loch containing Atlantic salmon, Salmo salar L., farms on the north-west coast of Scotland. J. Fish Dis. 31: 361-371. PMid:18355179

Planque B., Bellier E., Lazure P. 2007. Modelling potential spawning habitat of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus) in the Bay of Biscay. Fish. Oceanogr. 16: 16-30.

Purcell J.E. 1981. Feeding ecology of Rhizophysa eysenhardti, a siphonophore predator of fish larvae. Limnol. Oceanogr. 26: 424-432.

Purcell J.E. 1982. Feeding and growth of the siphonophore Muggiaea atlantica (Cunningham 1893). J. Exp. Mar. Bio. Ecol. 62: 39-54.

Purcell J.E. 1997. Pelagic cnidarians and ctenophores as predators: selective predation, feeding rates, and effects on prey populations. Ann. Inst. Oceanogr. Paris. 73: 125-137.

Purcell J.E, Kremer P. 1983. Feeding and metabolism of the siphonophore Sphaeronectes gracilis. J. Plankton Res. 5: 95-106.

R Development Core Team. 2013. R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing. Vienna, Austria. Available at:

Sabatés A., Olivar M.P. 1996. Variation of larval fish distributions associated with variability in the location of a shelf-slope front. Mar. Ecol. Prog. Ser. 135: 11–20.

Sabatés A., Gili J.M., Pagès F. 1989. Relationship between zooplankton distribution, geographic characteristics and hydrographic patterns of the Catalan coast. Mar. Biol. 103: 153-159.

Sabatés A., Salat J., Masó M. 2004. Spatial heterogeneity of fish larvae across a meandering current in the northwestern Mediterranean. Deep-Sea Res Pt I. 51: 545-557.

Sabatés A., Salat J., Palomera I., et al. 2007. Advection of anchovy (Engraulis encrasicolus) larvae along the Catalan continental slope (NW Mediterranean). Fish. Oceanogr. 16: 130-141.

Sabatés A., Pagès F., Atienza D., et al. 2010. Planktonic cnidarian distribution and feeding of Pelagia noctiluca in the NW Mediterranean Sea. Hydrobiologia 645: 153-165.

Silva T., Gislason A., Licandro P., et al. 2014. Long-term changes of euphausiids in shelf and oceanic habitats southwest, south and southeast of Iceland. J. Plankton Res. 36: 1262-1278.

Sournia A. 1994. Pelagic biogeography and fronts. Prog. Oceanogr. 34: 109-120.

Venables W.N., Ripley B.D. 2002. Modern Applied Statistics with S. Springer, New York, 498 pp.

Wang D., Vieira M.E.C., Salat J., et al. 1988. A shelf/slope frontal filament off the northeast Spanish Coast. J. Mar. Res. 46: 321-332.

Wood S.N. 2014. mgcv: Mixed GAM Computation Vehicle with GCV/AIC/REML smoothness estimation. R package version 1.8-3.

Wood S.N, Augustin N.H. 2002. GAMs with integrated model selection using penalized regression splines and applications to environmental modelling. Ecol. Model. 157: 157-177.

Zarauz L., Irigoien X., Urtizberea A., et al. 2007. Mapping plankton distribution in the Bay of Biscay during three consecutive spring surveys. Mar. Ecol. Prog. Ser. 345: 27-39.

Zuur A.F., Ieno E.N., Walker N.J., et al. 2009. Mixed effects models and extension in ecology with R. Springer-Verlag, New York, 574 pp.

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