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Further karyosystematic studies of the Boreonectesgriseostriatus (De Geer) group of sibling species (Coleoptera, Dytiscidae)-characterisation of B.emmerichi (Falkenstrom, 1936) and additional European data.

ABSTRACT: A lectotype is designated for the Tibetan species Deronectesemmerichi Falkenström, 1936 (Currently Boreonectesemmerichi (Falkenström)), and its habitus, as well as the median lobe and parameres of its aedeagus, are figured along with additional comparative material. Material of Boreonectesemmerichi from Sikkim (BMNH) represents the first record of a Boreonectes Angus, 2010 species from India. The karyotype of Boreonectesemmerichi is described as having 26 pairs of autosomes plus sex chromosomes which are X0 (♂), XX (♀). The karyotype is most like that of Boreonectesmacedonicus (Géuorguiev, 1959), but with slight differences. Additional chromosomal information is given for Boreonectesgriseostriatusgriseostriatus (De Geer, 1774) in the French Alps, Boreonectesgriseostriatusstrandi (Brinck, 1943) on the Kola Peninsula, Boreonectesmultilineatus (Falkenström, 1922) in the Pyrenees and Boreonectesibericus (Dutton & Angus, 2007) in the Spanish Picos de Europa.

SUBMITTER: Angus RB

PROVIDER: S-EPMC4387386 | biostudies-other | 2015

REPOSITORIES: biostudies-other

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Project description:BACKGROUND: Problems associated with resistant mosquitoes and the effects on non-target species by chemicals, evoke a reason to find alternative methods to control mosquitoes, like the use of natural predators. In this regard, aquatic coleopterans have been explored less compared to other insect predators. In the present study, an evaluation of the role of the larvae of Acilius sulcatus Linnaeus 1758 (Coleoptera: Dytiscidae) as predator of mosquito immatures was made in the laboratory. Its efficacy under field condition was also determined to emphasize its potential as bio-control agent of mosquitoes. METHODS: In the laboratory, the predation potential of the larvae of A. sulcatus was assessed using the larvae of Culex quinquefasciatus Say 1823 (Diptera: Culicidae) as prey at varying predator and prey densities and available space. Under field conditions, the effectiveness of the larvae of A. sulcatus was evaluated through augmentative release in ten cemented tanks hosting immatures of different mosquito species at varying density. The dip density changes in the mosquito immatures were used as indicator for the effectiveness of A. sulcatus larvae. RESULTS: A single larva of A. sulcatus consumed on an average 34 IV instar larvae of Cx. quinquefasciatus in a 24 h period. It was observed that feeding rate of A. sulcatus did not differ between the light-on (6 a.m. - 6 p.m.), and dark (6 p.m. - 6 a.m.) phases, but decreased with the volume of water i.e., space availability. The prey consumption of the larvae of A. sulcatus differed significantly (P < 0.05) with different prey, predator and volume combinations, revealed through univariate ANOVA. The field study revealed a significant decrease (p < 0.05) in larval density of different species of mosquitoes after 30 days from the introduction of A. sulcatus larvae, while with the withdrawal, a significant increase (p < 0.05) in larval density was noted indicating the efficacy of A. sulcatus in regulating mosquito immatures. In the control tanks, mean larval density did not differ (p > 0.05) throughout the study period. CONCLUSION: the larvae of the dytiscid beetle A. sulcatus proved to be an efficient predator of mosquito immatures and may be useful in biocontrol of medically important mosquitoes.

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Further karyosystematic studies of the Boreonectesgriseostriatus (De Geer) group of sibling species (Coleoptera, Dytiscidae)-characterisation of B.emmerichi (Falkenstrom, 1936) and additional European data.

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