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Marine Biology

, Volume 150, Issue 1, pp 29–44 | Cite as

Mesozooplankton community structure in offshore and coastal waters of the Ionian Sea (eastern Mediterranean) during mixed and stratified conditions

  • Alexis Ramfos
  • Stamatina Isari
  • Stylianos Somarakis
  • Dimitris Georgopoulos
  • Constantin Koutsikopoulos
  • Nina Fragopoulu
Research Article

Abstract

Depth-stratified samples, collected during a period where the water column was vertically mixed (March 2000) and a period of thermal stratification (September 2000), were analyzed in order to investigate the horizontal and vertical distribution patterns and composition of mesozooplankton, especially copepod species assemblages, in a pelagic (Ionian Sea) and a coastal area (Patraikos Gulf) of the eastern Mediterranean. Total mesozooplankton abundance and biomass were significantly lower in the highly oligotrophic offshore waters of the Ionian Sea when compared to the semi-enclosed Patraikos Gulf during both seasons. Small-sized copepods dominated the mesozooplankton community. An ‘offshore’ and a ‘coastal’ copepod assemblage were defined in the surface layer (0–50 m) only during March when differences in environmental conditions (i.e., temperature, salinity and fluorescence) were strong between the two areas. Copepod vertical community structure in offshore waters differed between sampling months. In March one assemblage (0–200 m) was mainly identified, while in September three distinct assemblages (0–50, 50–100 and 100–200 m) were observed, related to different vertical distribution patterns of the various copepod species. A pronounced seasonal change of the dominant copepods was evident in the surface layer, where strong differences in hydrological properties were observed from March to September. Below this layer, the copepod community was relatively stable showing decreasing seasonal differences with increasing depth.

Keywords

Thermal Stratification Offshore Water Zooplankton Abundance Copepod Species NMDS Ordination 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The present study was carried out in the framework of the European Union-funded project entitled ‘Southern Adriatic and Ionian Seas network on the protection of the marine environment. Contract no. DG/XII-XIV/EU/FAIR CT-98/4044’. The authors would like to thank the captain and the crew of the R/V ‘Aegaio’ as well as all participants in the two surveys for their support at sea as well as the two anonymous referees for their valuable comments and suggestions on the manuscript.

References

  1. Ambler JW, Miller CB (1987) Vertical habitat partitioning by copepodites and adults of subtropical oceanic copepods. Mar Biol 94:561–577CrossRefGoogle Scholar
  2. Cassotti R, Landolfi A, Brunet C, D’Ortenzio F, Mangoni O, d’Alcala MR, Denis M (2003) Composition and dynamics of the phytoplankton of the Ionian Sea (eastern Mediterranean). J Geophys Res, C 108:art-8116Google Scholar
  3. Christou ED (1998) Interannual variability of copepods in a Mediterranean coastal area (Saronikos Gulf, Aegean Sea). J Mar Syst 15:523–532CrossRefGoogle Scholar
  4. Clarke KR, Ainsworth M (1993) A method of linking multivariate community structure to environmental variables. Mar Ecol Prog Ser 92:205–219CrossRefGoogle Scholar
  5. Clarke KR, Warwick RM (1994) Change in marine communities: an approach to statistical analysis and interpretation. Natural Environment Research Council, Plymouth Marine Laboratory, PlymouthGoogle Scholar
  6. Daly Yahia MN, Suissi S, Yahia-Kefi OD (2004) Spatial and temporal structure of planktonic copepods in the Bay of Tunis (Southwestern Mediterranean Sea). Zool Stud 43:366–375Google Scholar
  7. Farstey V, Lazar B, Genin A (2002) Expansion and homogeneity of the vertical distribution of zooplankton in a very deep mixed layer. Mar Ecol Prog Ser 238:91–100CrossRefGoogle Scholar
  8. Field JG, Clarke KR, Warwick RM (1982) A practical strategy for analysing multispecies distribution patterns. Mar Ecol Prog Ser 8:37–52CrossRefGoogle Scholar
  9. Fragopoulu N, Lykakis JJ (1990) Vertical distribution and nocturnal migration of zooplankton in relation to the development of seasonal thermocline in Patraikos Gulf. Mar Biol 104:381–387CrossRefGoogle Scholar
  10. Fragopoulu N, Siokou-Frangou I, Christou ED, Mazzocchi MG (2001) Patterns of vertical distribution of Pseudocalanidae and Paracalanidae (Copepoda) in pelagic waters (0 to 300 m) of the Eastern Mediterranean Sea. Crustac Issues 74:49–68CrossRefGoogle Scholar
  11. Friligos N, Theocharis A, Georgopoulos D (1985) Preliminary physical and chemical observations during summer 1980 on a silled embayment in the Ionian Sea. Vie Milieu 35:115–125Google Scholar
  12. Frost BW, Fleminger A (1968) A revision of the genus Clausocalanus (Copepoda, Calanoida) with remarks on distributional patterns in diagnostic characters. Bull Scripps Inst Oceanogr Univ Calif 12:1–235Google Scholar
  13. Gauch Jr HG (1982) Multivariate analysis in community ecology. Cambridge University Press, CambridgeCrossRefGoogle Scholar
  14. Hosie GW, Cochran TG (1994) Mesoscale distribution patterns of macrozooplankton communities in Prydz Bay, Antarctica—January to February 1991. Mar Ecol Prog Ser 106:21–39CrossRefGoogle Scholar
  15. Incze LS, Herbet D, Wolff N, Oakey N, Dye D (2001) Changes in copepod distributions associated with increased turbulence from wind stress. Mar Ecol Prog Ser 213:229–240CrossRefGoogle Scholar
  16. Isari S, Ramfos A, Somarakis S, Koutsikopoulos C, Kallianiotis A, Fragopoulu N (2006) Mesozooplankton distribution in relation to hydrology of the Northeastern Aegean Sea, Eastern Mediterranean. J Plankt Res 28:241–255CrossRefGoogle Scholar
  17. Karakassis I, Eleutheriou A (1997) The continental shelf of Crete: structure of macrobenthic communities. Mar Ecol Progr Ser 160:185–196CrossRefGoogle Scholar
  18. Kouwenberg JHM (1994) Copepod distribution in relation to seasonal hydrographics and spatial structure in the North-western Mediterranean (Golfe du Lion). East Coast Shelf Sci 38:69–90CrossRefGoogle Scholar
  19. Kruskal JB, Wish M (1978) Multidimensional scaling. Sage Publications, Beverly HillsCrossRefGoogle Scholar
  20. Legadeuc Y, Boule M, Dodson JJ (1997) Effect of vertical mixing on the vertical distribution of copepods in coastal waters. J Plankton Res 19:1183–1204CrossRefGoogle Scholar
  21. Malanotte-Rizzoli P et al (1997) A synthesis of the Ionian Sea hydrography, circulation and water mass pathways during POEM-Phase I. Prog Oceanogr 39:153–204CrossRefGoogle Scholar
  22. Mazzocchi MG, Paffenhofer GA (1999) Swimming and feeding behaviour of the planktonic copepod Clausocalanus furcatus. J Plankton Res 21:1501–1518CrossRefGoogle Scholar
  23. Mazzocchi MG, Ribera d’Alcala M (1995) Reccurent patterns in zooplankton structure and succession in a variable coastal environment. ICES J Mar Sci 52:679–691CrossRefGoogle Scholar
  24. Mazzocchi MG, Christou ED, Fragopoulu N, Siokou-Frangou I (1997) Mesozooplankton distribution from Sicily to Cyprus (Eastern Mediterranean): general aspects. Oceanol Acta 20:521–535Google Scholar
  25. Mazzocchi MG, Nervegna D, D’Elia G, Di Capua I, Aguzzi L, Boldrin A (2003) Spring mesozooplankton communities in the epipelagic Ionian Sea in relation to the Eastern Mediterranean Transient. J Geophys Res, C 108:art-8114Google Scholar
  26. Menard F, Dallot S, Thomas G, Braconnot JC (1994) Temporal fluctuations of two Mediterranean salp populations from 1967 to 1990. Analysis of the influence of environmental variables using a Markov chain model. Mar Ecol Prog Ser 104:139–152CrossRefGoogle Scholar
  27. Moutin T, Raimbault P (2002) Primary production, carbon export and nutrients availability in western and eastern Mediterranean Sea in early summer 1996 (MINOS cruise). J Mar Syst 33:273–288CrossRefGoogle Scholar
  28. Mullin MM, Brooks ER, Reid FMH, Napp J, Stewart EF (1985) Vertical structure of nearshore plankton off southern California: a storm and a larval fish food web. Fish Bull 83:151–170Google Scholar
  29. NCMR (2001) Southern Adriatic and Ionian Seas network on the protection of the marine environment. Contract no. DG/XII-XIV/EU/FAIR CT-98/4044. Final techninal report 200 pGoogle Scholar
  30. Nishida S (1985) Taxonomy and distribution of the family Oithonidae (Copepoda, Cyclopoida) in the Pacific and Indian oceans. Bull Ocean Res Inst Univ Tokyo 20:1–167Google Scholar
  31. Paffenhofer GA, Mazzocchi MG (2002) On some aspects of the behaviour of Oithona plumifera (Copepoda: Cyclopoida). J Plankton Res 24:129–135CrossRefGoogle Scholar
  32. Paffenhofer GA, Mazzocchi MG (2003) Vertical distribution of subtropical epiplanktonic copepods. J Plankton Res 15:1139–1156CrossRefGoogle Scholar
  33. Peralba A, Mazzocchi MG (2004) Vertical and seasonal distribution of eight Clausocalanus species (Copepoda: Calanoida) in oligotrophic waters. ICES J Mar Sci 61:645–653CrossRefGoogle Scholar
  34. de Puelles MLF, Pinot JM, Valencia J (2003) Seasonal and interannual variability of zooplankton community in waters off Mallorca (Balearic Sea, Western Mediterranean): 1994–1999. Oceanol Acta 26:673–686CrossRefGoogle Scholar
  35. Ramfos A, Somarakis S, Koutsikopoulos C, Fragopoulu N (2005a) Summer mesozooplankton distribution in coastal waters of central Greece (eastern Mediterranean) I Hydrology and group composition. J Mar Biolog Assoc UK 85:755–764CrossRefGoogle Scholar
  36. Ramfos A, Somarakis S, Koutsikopoulos C, Fragopoulu N (2005b) Summer mesozooplankton distribution in coastal waters of central Greece (eastern Mediterranean). II. Species assemblages. J Mar Biolog Assoc UK 85:765–774CrossRefGoogle Scholar
  37. Raymont JEG (1983) Plankton and productivity in the oceans, 2nd edn. Pergamon Press, OxfordGoogle Scholar
  38. Ribera d’Alcala M, Conversano F, Corato F, Licandro P, Mangoni O, Marino D, Mazzocchi MG, Modigh M, Montresor M, Nardella M, Saggiomo V, Sarno D, Zingone A (2004) Seasonal patterns in plankton communities in a pluriannual time series at a coastal Mediterranean site (Gulf of Naples): an attempt to discern recurrences and trends. Sci Mar 68:65–83CrossRefGoogle Scholar
  39. Scotto di Carlo B, Ianora A, Fresi E, Hure J (1984) Vertical zonation patterns for Mediterranean copepods from the surface to 3000 m at a fixed station in the Tyrrhenian Sea. J Plankton Res 6:1031–1056CrossRefGoogle Scholar
  40. Scotto di Carlo B, Ianora A, Mazzocchi MG, Scardi M (1991) Atlantis II Cruise: uniformity of deep copepod assemblages in the Mediterranean Sea. J Plankton Res 13:263–277CrossRefGoogle Scholar
  41. Siokou-Frangou I (1996) Zooplankton annual cycle in a Mediterranean coastal area. J Plankton Res 18:203–223CrossRefGoogle Scholar
  42. Siokou-Frangou I, Christou ED, Fragopoulu N, Mazzocchi MG (1997) Mesozoolankton distribution from Sicily to Cyprus (Eastern Mediterranean): II. Copepod assemblages. Oceanol Acta 20:537–548Google Scholar
  43. Siokou-Frangou I, Bianchi M, Christaki U, Christou ED, Giannakourou A, Gotsis-Skretas O, Ignatiades L, Pagou K, Psarra S, Souvermezoglou E, Van Wambeke F, Zervakis V (2002) Carbon flow in the planktonic food web along a gradient of oligotrophy in the Aegean sea. J Mar Syst 33–34:335–353CrossRefGoogle Scholar
  44. Somarakis S, Drakopoulos PG, Filippou V (2002) Distribution and abundance of larval fish in the Northern Aegean Sea - Eastern Mediterranean - in relation to early summer oceanographic conditions. J Plankton Res 24:339–357CrossRefGoogle Scholar
  45. Sommer U, Stibor H (2002) Copepoda-Cladocera-Tunicata: the role of three major mesozooplankton groups in pelagic food webs. Ecol Res 17:161–174CrossRefGoogle Scholar
  46. Stergiou KI, Christou ED, Georgopoulos D, Zenetos A, Souvermezoglou E (1997) The Hellenic Seas: physics, chemistry, biology and fisheries. Oceanogr Mar Biol Annu Rev 35:415–538Google Scholar
  47. Theocharis A, Georgopoulos D, Lascaratos A, Nittis K (1993) Water masses and circulation in the central region of the Eastern Mediterranean: Eastern Ionian, South Aegean and Northwest Levantine, 1986–1987. Deep Sea Res II 40:1121–1142CrossRefGoogle Scholar
  48. Turner JT (2004) The importance of small planktonic copepods and their roles in pelagic marine food webs. Zool Stud 43:255–266Google Scholar
  49. Turner JT, Dagg MJ (1983) Vertical distributions of continental shelf zooplankton in stratified and isothermal waters. Biol Ocean 3:1–40Google Scholar
  50. Weikert H, Trinkaus S (1990) Vertical mesozooplankton abundance and distribution in the deep Eastern Mediterranean Sea SE of Crete. J Plankton Res 12:601–628CrossRefGoogle Scholar
  51. Weikert H, Koppelmann R, Wiegratz S (2001) Evidence of episodic changes in deep-sea mesozooplankton abundance and composition in the Levantine Sea (Eastern Mediterranean). J Mar Syst 30:221–239CrossRefGoogle Scholar
  52. Williams R (1985) Vertical distribution of Calanus finmarchicus and C. helgolandicus in relation to the development of the seasonal thermocline in the Celtic Sea. Mar Biol 86:145–149CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Alexis Ramfos
    • 1
  • Stamatina Isari
    • 1
  • Stylianos Somarakis
    • 1
  • Dimitris Georgopoulos
    • 2
  • Constantin Koutsikopoulos
    • 1
  • Nina Fragopoulu
    • 1
  1. 1.Department of BiologyUniversity of PatrasRioGreece
  2. 2.Hellenic Centre of Marine ResearchAnavissos, AtticaGreece

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