Acalyptrate Fliegen (Diptera: Schizophora, Acalyptratae) der jungen Düneninseln Memmert und Mellum unter besonderer Berücksichtigung der Agromyzidae und Chloropidae. Ergebnisse der Untersuchungen von 1984-1986 und 1994

Publication Type:Journal Article
Year of Publication:2007
Authors:M. von Tschirnhaus
ISBN Number:0341-406X
Accession Number:ZOOREC:ZOOR14409052298
Keywords:Carnidae, Desmometopa m-nigrum, Desmometopa sordida, Germany, Madiza glabra, Milichiidae, Phyllomyza securicornis

Acalyptrate flies (Diptera, Schizophora, "Acalyptratae") from the yellow dune islands Memmert and Mellum, with special reference to the Agromyzidae and Chloropidae. Study results of the years 1984[long dash]1986 and 1994. Investigations on the dipterous fly fauna of the so called Acalyptratae" had been carried out on two uninhabited and only some 140- years-old German dune islands in the North Sea. These nature protected islands of Memmert and Mellum are situated 90 km apart from each other. Since 1917 Memmert has been populated by domestic rabbits. Altogether, 37 families of acalyptrate Diptera out of 51 in Germany are recorded from ten out of eleven East Frisian Islands. From the two specifically studied young islands, 246,517 specimens have been identified to the family level. 3,408 Agromyzidae (leaf miner flies) belonged to 133 spp., and 47,833 Chloropidae (grass- or frit flies) to 69 spp. Selected species of 15 further families were also identified and discussed concerning their ecology; particularly regarded are salt marsh species, a cambium miner and the dispersal over sea. Tables present information on all agromyzids and chloropids from traps: diversity, flight activity, dominance, phenology, sexual index, and colour preference. It is demonstrated how many specimens must be collected weekly to find one more species. The study is mainly based on the catches of Moericke pan-traps placed on both islands during 1985 and 1994. The numbers of captured specimens of all families from both islands are compared. Included is a comparison of their different pan trap abundance with that of the mainland of western Germany. Sweep net samples enlarge the faunistic analysis. The different results of each sampling method are recorded. The fauna of the island grazed by rabbits differs from that of the island inhabited only by one different terrestrial mammal, the wood mouse. Agromyzidae, Camillidae, and (one species of) Sepsidae are the dipterous families peculiarly influenced by rabbits. A table places all potential host plant genera noted on both islands against all their specific recorded phytophagous leaf miner- and grass fly species. Eight species are new additions to the German checklist: Aulagromyza incognita (HERING, 1956) stat. rev., Liriomyza taurica ZLOBIN, 2002 (Agromyzidae), Chlorops scutellaris (ZETTERSTEDT, 1838), Meromyza rufa FEDOSEEVA, 1962, lncertella scotica (Gown], 1946), Oscinimorpha koeleriae NARCUK, 1970 (Chloropidae), Gymnochiromyia flavella (ZETTERSTEDT, 1848) (Chyromyidae), and Minettia desmometopa (DE MEIJERE, 1907) (Lauxaniidae). The chloropids Siphunculina nidicola NARTSHUK, 1971 and Meromyza rohdendorfi FEDOSEEVA, 1974 as well as Anthomyza paraneglecta ELBERG, 1968 (Anthomyzidae) are recorded for the second time in Germany. For Canada, Croatia, Norway and Spain, Canary Islands, faunistic data (first records) are included, too. New identification characters are presented for several species. Taxonomic notes on Incertella SABROSKY and Microcercis BESCHOVSKI are added.

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