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Taxonomic diversity and identification problems of oncaeid microcopepods in the Mediterranean Sea

Marine Biodiversity volume 39, pages 131–145 (2009)Cite this article

Abstract

The species diversity of the pelagic microcopepod family Oncaeidae collected with nets of 0.1-mm mesh size was studied at 6 stations along a west-to-east transect in the Mediterranean Sea down to a maximum depth of 1,000 m. A total of 27 species and two form variants have been identified, including three new records for the Mediterranean. In addition, about 20, as yet undescribed, new morphospecies were found (mainly from the genera Epicalymma and Triconia) which need to be examined further. The total number of identified oncaeid species was similar in the Western and Eastern Basins, but for some co-occurring sibling species, the estimated numerical dominance changed. The deep-sea fauna of Oncaeidae, studied at selected depth layers between 400 m and the near-bottom layer at >4,200 m depth in the eastern Mediterranean (Levantine Sea), showed rather constant species numbers down to ∼3,000 m depth. In the near-bottom layers, the diversity of oncaeids declined and species of Epicalymma strongly increased in numerical importance. The taxonomic status of all oncaeid species recorded earlier in the Mediterranean Sea is evaluated: 19 out of the 46 known valid oncaeid species are insufficiently described, and most of the taxonomically unresolved species (13 species) have originally been described from this area (type locality). The deficiencies in the species identification of oncaeids cast into doubt the allegedly cosmopolitan distribution of some species, in particular those of Mediterranean origin. The existing identification problems even of well-described oncaeid species are exemplified for the Oncaea media-complex, including O. media Giesbrecht, O. scottodicarloi Heron & Bradford-Grieve, and O. waldemari Bersano & Boxshall, which are often erroneously identified as a single species (O. media). The inadequacy in the species identification of Oncaeidae, in particular those from the Atlantic and Mediterranean, is mainly due to the lack of reliable identification keys for Oncaeidae in warm-temperate and/or tropical seas. Future efforts should be directed to the construction of identification keys that can be updated according to the latest taxonomic findings, which can be used by the non-expert as well as by the specialist. The adequate consideration of the numerous, as yet undescribed, microcopepod species in the world oceans, in particular the Oncaeidae, is a challenge for the study of the structure and function of plankton communities as well as for global biodiversity estimates.

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References

  • Bersano JGF, Boxshall GA (1996) [“1994”] Planktonic copepods of the genus Oncaea Philippi (Poecilostomatoida: Oncaeidae) from the waters off southern Brazil. Nauplius, Rio Grande 2:29–41 dated 1994

    Google Scholar 

  • Böttger-Schnack R (1994) The microcopepod fauna in the Eastern Mediterranean and Arabian Seas: a comparison with the Red Sea fauna. Hydrobiologia 292/293:271–282. doi:10.1007/BF00229951

    Article  Google Scholar 

  • Böttger-Schnack R (1996) Vertical structure of small metazoan plankton, especially non-calanoid copepods. I. Deep Arabian Sea. J Plankton Res 18:1073–1101. doi:10.1093/plankt/18.7.1073

    Article  Google Scholar 

  • Böttger-Schnack R (1997) Vertical structure of small metazoan plankton, especially non-calanoid copepods.II. Deep Eastern Mediterranean (Levantine Sea). Oceanol Acta 20:399–419

    Google Scholar 

  • Böttger-Schnack R (1999) Taxonomy of Oncaeidae (Copepoda: Poecilostomatoida) from the Red Sea. I. 11 species of Triconia gen. nov., and a redescription of T. similis (Sars) from Norwegian waters. Mitt Hamb Zool Mus Inst 96:39–128

    Google Scholar 

  • Böttger-Schnack R (2001) Taxonomy of Oncaeidae (Copepoda: Poecilostomatoida) from the Red Sea. II. Seven species of Oncaea s. str. Bull Nat Hist Mus Lond Zool 67:25–84

    Google Scholar 

  • Böttger-Schnack R (2002) Taxonomy of Oncaeidae (Copepoda, Poecilostomatoida) from the Red Sea. VI. Morphology and zoogeography of Oncaea bispinosa sp. nov., a sistertaxon of O. zernovi Shmeleva. J Plankton Res 24:1107–1129. doi:10.1093/plankt/24.11.1107

    Article  Google Scholar 

  • Böttger-Schnack R (2003) Taxonomy of Oncaeidae (Copepoda, Poecilostomatoida) from the Red Sea. V. Three species of Spinoncaea gen. nov. (ivlevi-group), with notes on zoogeographical distribution. Zool J Linn Soc 137:187–226. doi:10.1046/j.1096-3642.2003.00056.x

    Article  Google Scholar 

  • Böttger-Schnack R (2005) Taxonomy of Oncaeidae (Copepoda, Cyclopoida s.l.) from the Red Sea. VII. Oncaea cristata, a new species related to the ovalis-complex, and a revision of O. ovalis Shmeleva and O. bathyalis Shmeleva from the Mediterranean. Cah Biol Mar 46:161–209

    Google Scholar 

  • Böttger-Schnack R (in press) Taxonomy of Oncaeidae (Copepoda, Cyclopoida s.l.) from the Red Sea.- IX. Epicalymma bulbosa sp. nov., first record of the genus in the Red Sea. J Plankton Res

  • Böttger-Schnack R, Huys R (1997) Morphological observations on Oncaea mediterranea (Claus, 1863) (Copepoda: Poecilostomatoida) with a comparison of Red Sea and eastern Mediterranean populations. Bull Nat Hist Mus Lond (Zool) 63:137–147

    Google Scholar 

  • Böttger-Schnack R, Huys R (1998) Species groups within the genus Oncaea (Copepoda, Poecilostomatoida). J Mar Syst 15:369–371. doi:10.1016/S0924-7963(97)00072-9

    Article  Google Scholar 

  • Böttger-Schnack R, Huys R (2001) Taxonomy of Oncaeidae (Copepoda, Poecilostomatoida) from the Red Sea. III. Morphology and phylogenetic position of Oncaea subtilis Giesbrecht, 1892. Hydrobiologia 453/454:467–481. doi:10.1023/A:1013114706718

    Article  Google Scholar 

  • Böttger-Schnack R, Huys R (2004) Size polymorphism in Oncaea venusta Philippi, 1843, the validity of O. frosti Heron, 2002: a commentary. Hydrobiologia 513:1–5. doi:10.1023/B:hydr.0000018301.50664.3d

    Article  Google Scholar 

  • Böttger-Schnack R, Machida RJ (2008) Combining morphological and molecular traits for species identification and taxonomic grouping of oncaeid microcopepods. The 10th International Conference on Copepoda, 13-19 July 2008, Pattaya, Thailand, p.32 (Abstract)

  • Böttger-Schnack R, Lenz J, Weikert H (2004) Are taxonomic details of relevance to ecologists? An example from oncaeid microcopepods of the Red Sea. Mar Biol (Berl) 144:1127–1140. doi:10.1007/s00227-003-1272-8

    Article  Google Scholar 

  • Böttger-Schnack R, Schnack D, Hagen W (2008) Microcopepod community structure in the Gulf of Aqaba and the northern Red Sea, with special reference to Oncaeidae. J Plankton Res 30:529–550. doi:10.1093/plankt/fbn018

    Article  Google Scholar 

  • Boxshall GA (1977) The planktonic copepods of the northeastern Atlantic Ocean: Some taxonomic observations on the Oncaeidae (Cyclopoida). Bull Nat Hist Mus Lond Zool 31:103–155

    Google Scholar 

  • Conway DVP (2006) Identification of the copepodite developmental stages of twenty-six North Atlantic copepods. Occ Publ Mar biol Ass UK 21:1–28

    Google Scholar 

  • Conway DVP, Minton RC (1975) Identification of the copepodid stages of some common calanoid copepods. Mar Lab Aberdeen Int Rep New Ser 7

  • Dolan JR, Claustre H, Carlotti F, Plouvenez S, Moutin T (2002) Microzooplankton diversity: relationship of tintinnid ciliates with resources, competitors and predators from the Atlantic coast of Morocco to the Eastern Mediterranean. Deep Sea Res Part I Oceanogr Res Pap 49:1217–1232. doi:10.1016/S0967-0637(02)00021-3

    Article  Google Scholar 

  • Elvers D (2003) Plankton sampling for molecular population genetic studies. In: Hemleben C, Hoernle K, Jorgensen BB, Roether W (eds), 2001, Ostatlantik—Mittelmeer—Schwarzes Meer—Cruise No. 51, 12 September—28 December 2001. METEOR-Berichte, Universität Hamburg 03-1:2/41–2/42

  • Elvers D, Böttger-Schnack R, Blohm D, Hagen W (2006) Sympatric size variants of the microcopepod Oncaea venusta exhibit distinct lineages in DNA sequences. Mar Biol (Berl) 149:503–513. doi:10.1007/s00227-005-0234-8

    Article  CAS  Google Scholar 

  • Farran GP (1908) Second report on the Copepoda of the Irish Atlantic Slope. Scient Invest Fish Brch Ire 1906 II:3–104

    Google Scholar 

  • Furnestin M-L (1979) Aspects of the zoogeography of the Mediterranean plankton. In: Van der Spoel S, Pierrot-Bults AC (eds) Zoogeography and diversity in plankton. Arnold, London, pp 191–263

    Google Scholar 

  • Gibbons MJ, Richardson AJ, Angel MV, Buecher E, Esnal G, Fernandez Alamo MA, Gibson R, Itoh H, Pugh P, Böttger-Schnack R, Thuesen E (2005) What determines the likelihood of species discovery in marine holozooplankton: is size, range or depth important? Oikos 109:567–576. doi:10.1111/j.0030-1299.2005.13754.x

    Article  Google Scholar 

  • Giesbrecht W (1891) Elenco dei Copepodi pelagici raccolti dal tenente di vascello Gaetano Chierchia durante il viaggio della R. Corvetta ‘Vettor Pisani’ negli anni 1882–1885, e dal tenente di vascello Francesco Orsini nel Mar Rosso, nel, 1884. Atti della Reale Accademia dei Lincei. Rendiconti 4(7):484–481

    Google Scholar 

  • Giesbrecht W (1893) [“1892”] Systematik und Faunistik der pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. Fauna und Flora des Golfes von Neapel XIX:1-831 (dated 1892)

  • Gordeyeva KT (1972) New species of the genus Oncaea (Copepoda, Cyclopoida) from the tropical zone of the Atlantic Ocean. Zool Zh 51:963–968 in Russian, English summary

    Google Scholar 

  • Gordeyeva KT (1975) Pelagic Cyclopoida (Copepoda) from the tropic Atlantic and South Seas. Zool Zh 54:776–779 in Russian, English summary

    Google Scholar 

  • Greze VN (1963) Zooplankton of the Ionian Sea. Okeanol issled 9:42–59 in Russian, English summary

    Google Scholar 

  • Hemleben C, Hoernle K, Jorgensen BB, Roether W (2003) 2001, Ostatlantik—Mittelmeer—Schwarzes Meer—Cruise No. 51, 12 September—28 December 2001. METEOR-Berichte, Universität Hamburg 03-1:225

  • Heron GA (1977) Twenty six species of Oncaeidae (Copepoda : Cyclopoida) from the Southwest Pacific Antarctic area. In: Pawson L (ed) Biology of the Antarctic Seas, VI. Antarct Res Ser 26:37–96

  • Heron GA, Bradford-Grieve JM (1995) The marine fauna of New Zealand: Pelagic Copepoda: Poecilostomatoida: Oncaeidae. NZ Oceanogr Inst Mem 104:1–57

    Google Scholar 

  • Heron GA, Frost BW (2000) Copepods of the family Oncaeidae (Crustacea: Poecilostomatoida) in the northeast Pacific Ocean and inland coastal waters of Washington State. Proc Biol Soc Wash 113:1015–1063

    Google Scholar 

  • Heron GA, English TS, Damkaer DM (1984) Arctic Ocean Copepoda of the genera Lubbockia, Oncaea and Epicalymma (Poecilostomatoida: Oncaeidae), with remarks on distributions. J Crustac Biol 4:448–490. doi:10.2307/1548043

    Article  Google Scholar 

  • Holthuis LB, Vervoort W (2006) The date of publication of Wilhelm Giesbrecht’s “Pelagische Copepoden”, in Fauna und Flora des Golfes von Neapel, volume 19. Crustaceana 79:371–374. doi:10.1163/156854006776759581

    Article  Google Scholar 

  • Huys R, Böttger-Schnack R (1996/1997) On the diphyletic origin of the Oncaeidae Giesbrecht, 1892 (Copepoda: Poecilostomatoida) with a phylogenetic analysis of the Lubbockiidae fam. nov. Zool Anz 235:243–261

    Google Scholar 

  • Huys R, Böttger-Schnack R (2008 [“2007”]) Taxonomy of Oncaeidae (Copepoda, Poecilostomatoida) from the Red Sea.—VIII. Morphology and phylogenetic position of Oncaea tregoubovi Shmeleva, 1968 and the closely related O. prendeli Shmeleva, 1966 from the Mediterranean Sea. Mitt Hamb Zool Mus Inst 104:89–127. (dated 2007)

    Google Scholar 

  • Huys R, Boxshall GA (1991) Copepod evolution. The Ray Society, London

    Google Scholar 

  • Irigoien X, Harris HP (2006) Comparative population structure, abundance and vertical distribution of six copepod species in the North Atlantic: evidence for intraguild predation? Mar Biol Res 2:276–290. doi:10.1080/17451000600865321

    Article  Google Scholar 

  • Koppelmann R, Böttger-Schnack R, Möbius J, Weikert H (2009) Trophic relationships of zooplankton in the eastern Mediterranean based on stable isotope measurements. J Plankton Res 31:669–686. doi:10.1093/plankt/fbp013

    Article  CAS  Google Scholar 

  • Kovalev AV, Shmeleva AA (1982) Fauna of Copepoda in the Mediterranean. Ekologija Morja 8:82–87 in Russian

    Google Scholar 

  • Kršinić F (1998) Vertical distribution of protozoan and microcopepod communities in the South Adriatic Pit. J Plankton Res 20:1033–1060. doi:10.1093/plankt/20.6.1033

    Article  Google Scholar 

  • Kršinić F, Grbec G (2002) Some distributional characteristics of small zooplankton at two stations in the Otranto Strait (Eastern Mediterranean). Hydrobiologia 482:119–136. doi:10.1023/A:1021212431253

    Article  Google Scholar 

  • Kršinić F, Bojanic D, Precali R, Kraus R (2007) Quantitative variability of the copepod assemblages in the northern Adriatic Sea from 1993 to 1997. Estuar Coast Shelf Sci 74:528–538. doi:10.1016/j.ecss.2007.05.036

    Article  Google Scholar 

  • Lapernat PE, Razouls C (2001) Taxonomy and distribution of bathypelagic copepods from the Mediterranean Sea (off Malta). Vie Milieu 51:123–129

    Google Scholar 

  • Lučić D, Kršinić F (1998) Annual variabilty of mesozooplankton assemblages in Mali Ston Bay (Southern Adriatic). Period Biol 100:43–52

    Google Scholar 

  • Malt SJ (1982) Developmental stages of Oncaea media Giesbrecht, 1891, Oncaea subtilis Giesbrecht, 1892. Bull Brit Mus (Nat Hist) Zool 43:129–151

    Google Scholar 

  • Malt SJ (1983) Studies on the taxonomy and ecology of the marine copepod genus Oncaea Philippi. PhD dissertation, University of London, pp. 500

  • Malt SJ, Lakkis S, Ziedane R (1989) The copepod genus Oncaea (Poecilostomatoida) from the Lebanon: taxonomic and ecological observations. J Plankton Res 11:949–969. doi:10.1093/plankt/11.5.949

    Article  Google Scholar 

  • McKinnon AD, Duggan S, Carleton JH, Böttger-Schnack R (2008) Summer planktonic copepod communities of Australia’s North West Cape (Indian Ocean) during the 1997–99 El Niño/La Niña. J Plankton Res 30:839–855. doi:10.1093/plankt/fbn043

    Article  Google Scholar 

  • Nishibe Y (2005) The biology of oncaeid copepods (Poecilostomatoida) in the Oyashio region, western subarctic Pacific: its community structure, vertical distribution, life cycle and metabolism. PhD dissertation, Hokkaido University

  • Nishibe Y, Ikeda T (2004) Vertical distribution, abundance and community structure of oncaeid copepods in the Oyashio region, western subarctic Pacific. Mar Biol (Berl) 145:931–941. doi:10.1007/s00227-004-1392-9

    Article  Google Scholar 

  • Nishibe Y, Hirota Y, Ueda H (2009) Community structure and vertical distribution of oncaeid copepods in Tosa Bay, southern Japan. J Mar Biol Assoc UK 89:491–498. doi:10.1017/S0025315409003087

    Article  Google Scholar 

  • Paffenhöfer G-A (1993) On the ecology of marine cyclopoid copepods (Crustacea, Copepoda, Cyclopoida). J Plankton Res 15:37–55. doi:10.1093/plankt/15.1.37

    Article  Google Scholar 

  • Razouls C, de Bovée F, Kouwenberg J, Desreumaux N (2005–2009) Diversity and geographic distribution of marine planktonic Copepods. http://copepodes.obs-banyuls.fr/en

  • Rezai H, Yusoff FM, Arshad A, Kawamura A, Nishida S, Ross OBH (2004) Spatial and temporal distribution of copepods in the Straits of Malacca. Zool Stud 43:486–497

    Google Scholar 

  • Riccardi N, Mariotto L (2000) Seasonal variations in copepod body length: a comparison between different species in the Lagoon of Venice. Aquat Ecol 34:243–252

    Article  CAS  Google Scholar 

  • 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 13:263–277. doi:10.1093/plankt/13.2.263

    Article  Google Scholar 

  • Scotto di Carlo B, Hure J, Miralto A (1975) Bathypelagic copepods collected off the islands of Ponta (Mediterranean Sea) in June 1973 and June 1974. Pubbl Stn Zool Napoli 39:176–186

    Google Scholar 

  • 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 6:1031–1056. doi:10.1093/plankt/6.6.1031

    Article  Google Scholar 

  • Sever TM, Bayhan B, Taskavak E (2005) A preliminary study on the feeding regime of European Pilchard (Sardina pilchardus Walbaum 1792) in Izmir Bay, Turkey, Eastern Aegean Sea. Naga 28:41–48

    Google Scholar 

  • Shmeleva AA (1969) Espèces nouvelles du genre Oncaea (Copepoda, Cyclopoida) de la mer Adriatique. Bull Inst Oceanogr Monaco 68:1–28

    Google Scholar 

  • Skovgaard A (2005) Infection with the dinoflagellate parasite Blastodinium spp. in two Mediterranean copepods. Aquat Microb Ecol 38:93–101. doi:10.3354/ame038093

    Article  Google Scholar 

  • Steedman HF (1976) Zooplankton fixation and preservation. Unesco Press, Paris

    Google Scholar 

  • Uysal Z, Kideyş AE, Shmeleva AA, Zagorodnaya JA, Gubanova AD (2002) Checklist of copepods (Calanoida and Podoplea) from the northern Levantine basin shelf waters. Hydrobiologia 482:15–21. doi:10.1023/A:1021253721682

    Article  Google Scholar 

  • Vaissière R, Seguin G (1980) Etude préliminaire de peuplements de copépodes (juillet 1977) en relation avec l’hydrologie des mers Tyrrhénienne et Ionienne. Oceanol Acta 3:17–29

    Google Scholar 

  • Webber MK, Roff JC (1995) Annual structure of the copepod community and its associated pelagic environment off Discovery Bay, Jamaica. Mar Biol 123:467–479

    Article  Google Scholar 

  • Weikert H (1982) The vertical distribution of zooplankton in relation to habitat zones in the area of the Atlantis II Deep central Red Sea. Mar Ecol Prog Ser 8:129–143. doi:10.3354/meps008129

    Article  Google Scholar 

  • Weikert H (1987) Plankton and the pelagic environment. In: Edwards AJ, Head SM (eds) Red Sea. Key environments. Pergamon, Oxford, pp 90–111

    Google Scholar 

  • Weikert H, John H-C (1981) Experiences with a modified Bé multiple opening-closing plankton net. J Plankton Res 3:167–176. doi:10.1093/plankt/3.2.167

    Article  Google Scholar 

  • WeikertH,Trinkaus S (1990) Vertical mesozooplanktonabundance and distribution in the deep Eastern Mediterranean Sea SE of Crete. J Plankton Res 12:601–628

    Article  Google Scholar 

  • Wiebe PH, Morton AW, Bradley AM, Backus RH, Craddock JE, Barber V, Cowles TJ, Flierl GR (1985) New developments in the MOCNESS, an apparatus for sampling zooplankton and micronekton. Mar Biol (Berl) 87:313–323. doi:10.1007/BF00397811

    Article  Google Scholar 

  • Wiryawan B (1997) Mesozooplankton dynamics in the northern Adratic Sea and the influence of eutrophication by the River Po. Ber Inst Meeresk Kiel 296:1–233

    Google Scholar 

  • Wüst G (1960) Die Tiefenzirkulation des Mittelländischen Meeres in den Kernschichten des Zwischen- und des Tiefenwassers. Dtsch hydrogr Z 13:105–131

    Article  Google Scholar 

  • Wüst G (1961) On the vertical circulation of the Mediterranean Sea. J Geophys Res 66:3261–3271. doi:10.1029/JZ066i010p03261

    Article  Google Scholar 

  • Wishner KF (1980) The biomass of the deep-sea benthopelagic plankton. Deep-Sea Res 27(A):203–216

    Article  Google Scholar 

  • Zervoudaki S, Christou ED, Nielsen TG, Siokou-Frangou I et al (2007) The importance of small-sized copepods in a frontal area of the Aegean Sea. J Plankton Res 29:317–338. doi:10.1093/plankt/fbm018

    Article  Google Scholar 

  • Zervoudaki S, Nielsen TG, Christou ED, Siokou-Frangou I (2006) Zooplankton distribution and diversity in a frontal area of the Aegean Sea. Mar Biol Res 2:149–168. doi:10.1080/17451000600702037

    Article  Google Scholar 

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Acknowledgements

We wish to thank D. Elvers (University of Bremen) and Dr. R. Koppelmann (University of Hamburg) for collecting the fine mesh net samples during RV “Meteor” cruise 51/2. Thanks are due to Dr. H. Weikert (University of Hamburg) for making available additional small mesh net samples from benthopelagic layers in the Mediterranean Sea. Sincere thanks are given to Prof. K. Lochte (formerly IFM-GEOMAR, now AWI, Bremerhaven) and Prof. U. Riebesell (IFM-GEOMAR) for providing R.B.--S with excellent working facilities. The personal support of Elisabeth Samusch to R.B.-S is gratefully acknowledged. Parts of this study are based on a joint project of R.B.-S and Dr. R. Machida (University of Tokyo), representing a contribution from the Census of Marine Zooplankton (CMarZ), an ocean realm field project of the Census of Marine Life. The study was supported by a research grant from the German Science Foundation to R.B.-S (Schn 455/4-1).

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  1. Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR), Düsternbrooker Weg 20, D-24105, Kiel, Germany

    Ruth Böttger-Schnack & Dietrich Schnack

  2. Moorsehdener Weg 8, D-24211, Rastorf-Rosenfeld, Germany

    Ruth Böttger-Schnack

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Böttger-Schnack, R., Schnack, D. Taxonomic diversity and identification problems of oncaeid microcopepods in the Mediterranean Sea. Mar Biodiv 39, 131–145 (2009). https://doi.org/10.1007/s12526-009-0013-8

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Keywords

  • Copepoda
  • Oncaeidae
  • Mediterranean Sea
  • Species diversity
  • Deep-sea
  • Oncaea media-complex