Geographic Distribution of Pelagic Copepods in the Mediterranean > Conclusion
 
   


 

Conclusion :

With 588 species, the Mediterranean Sea (with the Black Sea) comprises 21.7 % of 2644 identified in all seas.

With the exception of species regarded as "endemic" to the Mediterranean (61) and the monstrillids (22), a review of common species to this sea and the surrounding seas shows that 322 species have been observed in the Atlantic and Indian (12.3 %) including 222 Calanoida and 100 of other orders. 78 species are common only with the North Atlantic (49 Calanoida and 29 podopleans) and 84 only with the Indian-Red Sea (50 Calanoida and 34 podopleans).

Such results reveals a double influence of the origin of the fauna of Mediterranean copepods: Indian (old and lessepsian) and subtropical and temperate Atlantic. But as already mentioned by various authors Mediterranean fauna has been able to recover after the messinian episode from the influx of Atlantic water (407 species of the North Atlantic are known in the Mediterranean, or 71.5 %, of whom 278 Calanoida and 129 of other orders). The siculo-Tunisian threshold appears to be a barrier, despite the penetration the surface current initiated by the Atlantic flow to the east basin.

A review of species in the west and east bassins and in the Adriatic allow to establish the following summary:

Calanoida
Other orders (podopleans)
Total species
West basin:
305
165
Adriatic:
181
112
East basin:
251
147

This table shows the relative poverty or lesser diversity of the east basin, subjected to less diverse hydrological conditions than the west basin, which moreover has the influence of the intermediate current from the eastern part. Numbers to relativize because of a prospection older and more followed in the west basin than in the east basin.

The number of common species to the W and E basins is 322 (55.4 %) of which 198 Calanoida and 124 podopleans. On this total 122 species are only in the W basin (of which 90 Calanoida and 32 of other orders) and 62 only in the E basin (of which 43 Calanoida and 19 of other orders)

On the 561 Mediterranean species, 288 are known in at least 11 zones (of the 25 world geographical zones) of which 206 Calanoida and 82 of other orders.
   

 Any use of this site for a publication will be mentioned with the following reference :

Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2017. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Available at http://copepodes.obs-banyuls.fr/en 
[Accessed January 21, 2018]

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