CHIRONOMUS Journal of Chironomidae Research , ces 365 derniers jours

Journal of Chironomidae research



lundi 4 septembre 2023

  • Chironomid research through pandemics, recent advances

    After 5 blank years since the last symposium and 3 years of COVID-19 pandemics, the 21st International Symposium on Chironomidae (ISC2022) was held for the first time online from the 4th to the 7th of July, 2022. The symposium gathered a total of 45 presentations organized around the major topics of ecology, taxonomy, genomics, phylogeny, and physiology. We introduce here a general overview of the studies presented during the symposium, together with the few papers published in the present proceedings special issue.


jeudi 17 août 2023

  • The pupa of Chironomus decorus Johannsen, 1905 – additional description and an unusual sexual dimorphism

    In his original description of Chironomus decorus, Johannsen included a brief description of the pupa but with insufficient detail to differentiate it from other North American species, particularly those of the decorus-complex. In this note, further information of pupal characters, mostly derived from specimens reared from egg masses, are given which allow separation of these pupae from those of some other species, e.g., presence of frontal warts, and in the case of the males, to permit accurate identification by the presence of a small secondary tubercle.


vendredi 28 avril 2023

  • Seasonal variation in the Chironomidae (Diptera) communities of two Faroese streams

    Seasonal variation of freshwater invertebrate communities is strongly influenced by abiotic factors including temperature and precipitation which, in turn, are predicted to be affected by climate change. It is important to study these effects, not least since they may affect higher trophic levels and ecosystem dynamics.

    Our aim with this study was to compare the seasonal variation of the community composition of Chironomidae (Diptera) in two streams in the Faroe Islands and to see how this related to abiotic factors. Additionally, we studied the life cycle of Tvetenia calvescens (Edwards 1929), the dominant species in the streams. For this purpose, Chironomidae larvae were collected from two adjacent streams of different sizes in the Faroe Islands at regular intervals over the course of 15 months.

    We found that Tvetenia calvescens was the most abundant species in the streams, followed by Eukiefferiella minor (Edwards 1929). The community composition varied in different months and between the two streams and was shaped by water temperature and flow velocity.

    Larval densities were generally higher in the smaller stream than in the larger stream, but densities were not correlated with water temperature, monthly temperature amplitude or flow velocity.

    We found that in both streams Tvetenia calvescens was bivoltine with adult emergence in May/June and September/October.


mercredi 29 mars 2023

  • Chironomidae collected at the seashore in Kume Island, Japan

    Local residents and tourists of Kume Island suffer from the biting of Leptoconops taiwanensis (Lien, Lin & Weng 1998) (Ceratopogonidae), a species known as asa-mushi (sea lettuce bug). Because L. taiwanensis bites tend to occur while harvesting sea lettuce, some locals mistakenly believe that L. taiwanensis inhabits the sea lettuce. The objectives of the current study are to (i) identify the chironomid species inhabiting the sea lettuce, (ii) determine the distribution of the larvae, and (iii) perform a faunistic investigation of Chironomidae at Shinri Beach. Only one male chironomid species, Ainuyusurika tuberculatum (Tokunaga, 1940), emerged from the samples taken from the beach. The density of chironomid larvae was the highest in the presence of sea lettuce. A total of 53 males were collected using light traps, of which we identified males of seven genera and seven species belonging to three subfamilies. No L. taiwanensis were collected in this study.


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