Distribution patterns of freshwater Ostracoda (Crustacea) in the Canary Islands with regards to habitat use and biogeography

摘要: In this study biogeographic patterns and habitatrelationships of freshwater Ostracoda wereinvestigated in the Canary Island archipelago. Mostdata were collected from published studies, thoughalso new data Gran Canaria are presented. all,22 species presently known to theCanaries. Six species, viz. Ilyocypris bradyi,Cypris bispinosa, C. pubera, Herpetocypris chevreuxi, Heterocyprisincongruens, Sarscypridopsis lanzarotensisare Canaria, first two also being newto Canaries general. Testing influence ofa number variables on faunal richness indicatedonly a weak association with island area. Distancesbetween islands proved not significant, sodid other properties islands, including age,altitude precipitation. This was contrast acomparison set comprising aquatic beetles.Like beetles, however, ostracods did show nestedpattern, i.e. faunas species-poor notsubsets species-rich faunas. By having lowendemicity (endemic lacking Canaries),the ostracod fauna resembled fern floras. Bothgroups organisms have tiny diaspores (diameter<0.1 mm) extensively parthenogeneticsuggesting similar dispersal founder mechanisms.We identified pattern (with one exception), wherethose distributions extending acrossseveral had wider within-islanddistributions. Many showed affinities todifferent habitats depending conductivity water,altitude habitat types: whether they werepermanent or temporary, hypogean epigean, orcharacterized by running stagnant waters.