| 1. |
- Chakma, Sanjib, et al.
(author)
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Preliminary report on freshwater oligochaetes from some districts of Tamil Nadu (India), along with DNA barcode sequence of a commercially important oligochaete in Chennai
- 2020
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In: Zoosymposia. - : Magnolia Press. - 1178-9905 .- 1178-9913. ; 17, s. 45-52
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Journal article (peer-reviewed)abstract
- A survey of aquatic Oligochaeta was conducted at Thiruvallur, Chennai, Kanchipuram, Villupuram and Nilgiris districts of Tamil Nadu from October 2015 to June 2016. Eleven taxa were recorded from a total of 922 specimens examined, eight of them were identified to species level. Five naidids identified during the present study: Branchiodrilus semperi, Dero dorsalis, Dero digitata, Dero indica and Dero zeylanica, and six tubificid taxa Branchiura sowerbyi, Tubificidae sp. 1, Tubificidae sp. 2, Tubificidae sp. 3, Limnodrilus hoffmeisteri and L. udekemianus. Dero dorsalis constitute the first report for Kanchipuram district. A DNA barcode sequence (GenBank accession no. MF125273) of the commercially important Limnodrilus hoffmeisteri, commonly known as ‘Tubifex worms’ in Chennai, was obtained and compared with other published COI sequences from that morphospecies from around the world.
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| 2. |
- Schmelz, R. M., et al.
(author)
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Astacopsidrilus hibernicus sp. nov. (Phreodrilidae, Oligochaeta, Annelida) from Irish peatlands
- 2020
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In: PROCEEDINGS OF THE 14TH INTERNATIONAL SYMPOSIUM ON AQUATIC OLIGOCHAETA. - : Magnolia Press. - 9781776708697 ; , s. 34-44
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Book chapter (other academic/artistic)abstract
- The discovery of a large and flourishing population of Phreodrilidae in terrestrial peatlands in northwest Ireland was surprising on two counts: these oligochaete worms are usually aquatic and most of the species occur in the Southern Hemisphere. The phreodrilids were discovered in a project that targeted Enchytraeidae, therefore methods adapted to the investigation of enchytraeids could be applied, including the study of living animals and properly fixed whole mounts. DNA sequencing was also performed. All worms identified here belong to one species, new to science, and placed in the genus Astacopsidrilus, because of the ventral position of the spermathecal pores and the opening of the female funnels inside the spermathecal vestibule. Astacopsidrilus hibernicus sp. nov. is mainly distinguished by thick segmental cushions of epidermal gland cells on the dorsal side of the posterior body half. Male sexual organs and spermathecae are comparatively small and without the oftenobserved bizarre modifications common in species of this family. DNA sequencing yielded a fragment of the 16S rRNA gene. This is the first description of a phreodrilid species from Europe; the few previous recordings of this family in Ireland and the United Kingdom had been left unidentified.
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| 3. |
- Sonesten, Lars
(author)
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Composition and abundance of oligochaetes in large Scandinavian lakes in a morpho-edaphic index framework—in the 1970s and 50+ years later
- 2023
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In: Zoosymposia. - 1178-9905 .- 1178-9913. ; 23, s. 41-51
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Journal article (peer-reviewed)abstract
- Bottom-living oligochaetes and chironomid larvae, thanks to their supposedly integrative power, could provide more robust measures of the water quality of lakes than separate chemical data. The oligochaete fauna of the large lakes of southern Scandinavia has been studied in detail over many years—often 100 years or more (Milbrink, 2020). Characteristic species associations and the ecological preferences of each oligochaete species are thus relatively well-known. In Milbrink (2020) it was shown that the precision could be greatly improved if the relationship between oligochaete species and chemical data could be instead demonstrated within a morpho-edaphic index framework (Ryder et al. 1974). The percentage composition and total abundance of oligochaetes per sample in a number of large lakes or selected basins of large lakes in southern Sweden and Norway were thus tested against this index in the 1970s (Milbrink, 1978). The trophic change which had taken place in the oligotrophic Lake Vättern—first with eutrophication and later with oligotrophication—was illustrated graphically and discussed in this work (Milbrink, 2020). A very similar trophic change could also be seen in the oligotrophic Lake Vänern (the basin of Värmlandssjön), as well as in the more eutrophic Lakes Mälaren and Hjälmaren. All these large lakes, once eutrophied in the 1950s and 1960s, are today undergoing oligotrophication. We simply have a melioration thanks to advanced sewage treatment since the 1960s. With our new knowledge, it is informative studying changes in species composition after trophic change. In a time when efforts to save the environment often fail, this new development is a real success story
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