CHIRONOMUS Journal of Chironomidae Research <p>The CHIRONOMUS Journal of Chironomidae Research is devoted to publishing peer-reviewed research articles related to all aspects of chironomid research. The journal also serves as an updated news bulletin for the Chironomidae research community. The journal has one issue per year, but articles are published online continuously after they are accepted. The journal is open access, and can be downloaded freely from this website. All research articles submitted to CHIRONOMUS<em>&nbsp;Current Reseach</em>&nbsp;section are subject to peer-review. There are no page charges for manuscripts accepted for publication.</p> Norwegian University of Science and Technology en-US CHIRONOMUS Journal of Chironomidae Research 0172-1941 <p>Authors who publish with this Open Access journal agree to the following terms:</p> <ol> <li>Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a&nbsp;<a href="" target="_new">Creative Commons Attribution License</a> 4.0 that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</li> <li>Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.</li> <li>Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See&nbsp;<a href="" target="_new">The Effect of Open Access</a>).</li> </ol> Chironomid research through pandemics, recent advances <p style="font-weight: 400;">After 5 blank years since the last symposium and 3 years of COVID-19 pandemics, the 21<sup>st</sup> International Symposium on Chironomidae (ISC2022) was held for the first time online from the 4<sup>th</sup> to the 7<sup>th</sup> 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.</p> Richard Cornette Valeria Lencioni Peter Langton Copyright (c) 2023 Richard Cornette; Valeria Lencioni, Peter Langton 2023-12-29 2023-12-29 37 2 10 10.5324/cjcr.v0i37.5570 Temporal partitioning of Chironomidae emergence in an insular, tropical rainforest stream <p>Annual water temperature variation strongly influences larval growth of aquatic insects in streams located in temperate regions or at high elevations, which produces cohorts with highly synchronized emergence periods and short average annual durations of emergence. Studies of Chironomidae in tropical streams indicate that species in these habitats have longer average durations of emergence due to reduced annual variation in water temperature. We used emergence trap data collected over one year from Quebrada Prieta (El Verde Field Station, Puerto Rico) to test the prediction that chironomids of an insular rainforest stream should have longer average annual durations of emergence than chironomids in both temperate streams and mainland streams in continental tropical regions. Taxa richness was relatively low with twenty-eight Chironomidae taxa collected from Quebrada Prieta. Emergence patterns of the most common taxa demonstrated some seasonally with the highest emergence generally occurring during the dry season (January through April). The estimated average emergence duration of Chironomidae in Quebrada Prieta was 205 days/species/year, which was greater than estimates of average durations for chironomids of three streams in Pennsylvania, USA (70 days/species/year), 6 streams in Minnesota, USA (89 days/species/year), and four streams in Guanacaste National Park in northwestern Costa Rica (116 days/species/year). The emergence duration for the chironomid community in Quebrada Prieta was most similar to another tropical, mountain stream in the Democratic Republic of the Congo (255 days/species/year). Although many taxa emerged throughout the one-year sampling period, some taxa in Quebrada Prieta had distinct emergence peaks. This demonstrates that although environmental conditions are stable enough to allow for emergence throughout the year for many species, there is some seasonality in the development of chironomid taxa in this tropical stream. These results are consistent with predictions that invertebrates in tropical streams will have longer, less synchronous emergence periods than species in temperate regions with high annual fluctuations in temperature. However, this research is also similar to several other studies that have identified seasonal emergence peaks in tropical chironomids which demonstrates a need to better understand the exogenous cues that affect these patterns.</p> R. William Bouchard Jr. Leonard C. Ferrington, Jr. Copyright (c) 2023 R. William Bouchard Jr., Leonard C. Ferrington, Jr. 2023-12-29 2023-12-29 37 11 25 10.5324/cjcr.v0i37.5045 Seasonal variation in the Chironomidae (Diptera) communities of two Faroese streams <p>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.</p> <p>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 <em>Tvetenia calvescens</em> (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.</p> <p>We found that <em>Tvetenia calvescens</em> was the most abundant species in the streams, followed by <em>Eukiefferiella minor</em> (Edwards 1929). The community composition varied in different months and between the two streams and was shaped by water temperature and flow velocity.</p> <p>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.</p> <p>We found that in both streams <em>Tvetenia calvescens </em>was bivoltine with adult emergence in May/June and September/October.</p> Leivur Janus Hansen Agnes-Katharina Kreiling Gísli Már Gíslason Copyright (c) 2023 Agnes-Katharina Kreiling, Leivur Janus Hansen, Gísli Már Gíslason 2023-12-29 2023-12-29 37 26 37 10.5324/cjcr.v0i37.5075 Chironomidae collected at the seashore in Kume Island, Japan <p>Local residents and tourists of Kume Island suffer from the biting of <em>Leptoconops taiwanensis</em> (Lien, Lin &amp; Weng 1998) (Ceratopogonidae), a species known as asa-mushi (sea lettuce bug). Because <em>L. taiwanensis</em> bites tend to occur while harvesting sea lettuce, some locals mistakenly believe that <em>L. taiwanensis</em> 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, <em>Ainuyusurika tuberculatum</em> (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 <em>L. taiwanensis </em>were collected in this study.</p> Goro Kimura Akira Nakamoto Tomomitsu Urzu Koichiro Kawai Copyright (c) 2023 Goro Kimura 2023-12-29 2023-12-29 37 38 41 10.5324/cjcr.v0i37.5049 Bryophaenocladius adigensis sp. n., a new species from the Italian Alps (Chironomidae, Orthocladiinae) <p><em>Bryophaenocladius adigensis</em> sp. n., is diagnosed and described based on two male adults material collected in the Sardagna stream, near the city of Trento (Northern Italy). Although the male of <em>B. adigensis</em> sp. n. shows some morphological affinities with other <em>Bryophaenocladius</em> species (<em>B. aestivus</em>, <em>B. flexidens</em>, <em>B. muscicola</em>, <em>B. subvernalis </em>and <em>B. thaleri</em>), it exhibits a combination of unique characters that make it a different species: palpomere 3 with 3 typical sensilla coeloconica; absence of antepronotal setae; antennal ratio= 0.86; tergite IX and anal point without lateral expansion; aedeagal lobe typically sub-oval; virga consisting of 2 curved unequal spines; distal part of gonocoxite with a vertical row of setae; inferior volsella, long nose-like shaped, distal part spatulate with 2 characteristic pre-apical setae, median part bare. Currently, about 42 <em>Bryophaenocladius</em> species are reported from Europe, of which only 11 are known from Italy. Consequently, the description here of <em>B. adigensis</em> sp. n. increases the total number in the genus to 12 from this country. Based on type-locality features, we can consider <em>B. adigensis</em> sp. n. as typical of mountain streams fed mainly by groundwater.</p> Joel Moubayed Valeria Lencioni Copyright (c) 2023 Joel MOUBAYED, Valeria Lencioni 2023-12-29 2023-12-29 37 42 47 10.5324/cjcr.v0i37.5025 Limnophyes knispelae sp. n. and L. sartorii sp. n., two new crenophilous species from the Swiss Alps (Chironomidae, Orthocladiinae) <p><em>Limnophyes knispelae</em> sp. n and <em>L. sartorii</em> sp. n. are diagnosed and described based on material collected in the high Alpine valley of the Rhône river and the cirque of Macun in the Swiss National Park (alt. 1800-2616 m a.s.l.). The first new species is described only as male adult, while the second as male adult and pupal exuviae. Main distinguishing characters found in the male adult of <em>L. knispelae</em> sp. n. <em>L. sartorii</em> sp. n. are: clypeus shield-like shaped; humeral pit typically circular with 3-4 or 9 lanceolate setae; virga strong spine-like; preepisternals vary from 4-6 to 4-8. The pupal exuviae of <em>L. sartorii</em> sp. n. is characterized by having frontal apotome domed; thoracic horn reduced to nose-like tubercle; posterior area of tergites II-VI with 1-7 rows of minute hooks; segment VIII with 5 lateral setae; inner posterior margin of anal lobe straight.<span class="Apple-converted-space"> </span></p> <p>A combination of the latter relevant morphological characters has allowed us to consider each of the two new species as a local biogeographic representative of the Swiss Alps. Currently, the genus <em>Limnophyes</em> Eaton, 1875 is represented in Switzerland by 15 species. Consequently, the description of <em>L. knispelae</em> sp. n and <em>L. sartorii</em> sp. n. increases the total number in the genus to 17 known valid species from this country. Discussions and a differential diagnosis on the two new species are given, in which some morphological affinities and distinguishing characters with other related congeners are detailed and highlighted. Comments on the ecology and geographical distribution of the new species are also provided.</p> Joel Moubayed Brigitte Lods-Crozet Copyright (c) 2023 Joel Moubayed, Brigitte Lods-Crozet 2023-12-29 2023-12-29 37 48 58 10.5324/cjcr.v0i37.5012 A new association between Harpellales, insect-gut inhabiting fungi, and Chironomidae in Japan with an updated list of Harpellales documented from Chironomidae <p>Harpellales (Zoopagomycotina) is a fungal order of which species inhabit the intestine of aquatic arthropods by attaching their thalli to the host’s gut lining. Harpellales consists of 270 species with over half found in Chironomidae larvae. The aim of this research is to document a species, <em>S. pedifer</em>, new to Japan with a chironomid host association and to list all Chironomidae-commensal species of Harpellales with host and country information.</p> Hiroki Sato Copyright (c) 2023 Hiroki Sato 2023-12-29 2023-12-29 37 59 69 10.5324/cjcr.v0i37.5050