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139 results for “Chironomids”
Physiological Ecology of Euryhaline Chironomid Midges in Cape Cod MA 2002-2003
In summer, 2002, hundreds of thousands of salt-tolerant midges (Chironomus decorus group, Diptera, Chironomidae) emerged from Pilgrim Lake/East Harbor, Truro, MA. The lake is a former estuary but has been separated from the sea for over 150 years by restrictions associated with railroad and highway construction. Brackish conditions caused by leaky tide gates designed to drain excess freshwater from the lake, coupled with high nutrient levels exacerbated by a massive fish kill the previous year, created conditions that supported densities of midge larvae of more than 5,000/m2 and produced a severe public nuisance in the vicinity of the lake when the adult midges emerged. The emergence coincided with National Park Service efforts to increase tidal flow into the lake, as part of a long-term commitment to restoration of restricted coastal waters within the Cape Cod National Seashore. We are studying the effects of increased tidal flow on midge populations, and in particular evaluating how high salinities need to be to reduce the potential for further nuisance outbreaks of the midges.
LTREB experimental chironomid mesocosms at Myvatn, Iceland
During the summer of 2014, we conducted experiments testing whether increasing numbers of chironomid larvae would increase primary production and standing chlorophyll a concentrations. We incubated experimental mesocosms with varying numbers of chironomid larvae for 12 days in July. We tested sediments for chlorophyll a concentrations, as sediments are primarily composed of benthic diatoms. We tested the oxygen production in these mesocosms. We did this by sealing the mesocosms and incubating them in Lake Myvatn for 3 hours, and taking measurements of dissolved oxygen before and after the incubations. We were also interested in whether this increase in food resources might translate to increased growth rates of chironomid larvae at high larval densities. After stocking experimental mesocosms with varying numbers of chironomid larvae, we set these mesocosms in Lake Myvatn for 12 days. We collected the larvae at the end of the 12 day experiment and obtained the average dry weights of the Chironomus islandicus larvae in each mesocosm. We hypothesized that the tubes that chironomid larvae build would be a superior substrate for algal growth, as compared to loose sediments. Because there are two taxa (Chironomus islandicus and Tanytarsus gracilentus) that are overwhelmingly dominant at our study site, we wondered whether there would be differences in this effect between the two species. We stocked mesocosms with larvae from one of the two species, and mesocosms were then incubated in Lake Myvatn. We collected sediments and larval tubes from each mesocosm and tested their chlorophyll a concentrations. We hypothesized that one mechanism that chironomid larvae might alleviate algal nutrient limitation by depositing concentrated nutrients near algae in the form of larval excretions. We collected chironomid larvae from Lake Myvatn and placed them in distilled water. We then sieved out the larvae and their fecal passings, and transported the water samples to Madison, WI, USA,
Chironomid taxa relative abundance information and lake identifiers for: Changes in midge assemblages reflect climate and trophic gradients across north temperate and boreal lakes since the pre-industrial period
<p>File 1: Relative abundances for chironomid taxa used in the manuscript: Changes in midge assemblages reflect climate and trophic gradients across north temperate and boreal lakes since the pre-industrial period. Lake_ID corresponds to the lake IDs attributed to each lake sampled as part of the LakePulse Network</p> <p>File 2: Lake_ID, lake name, latitude, longitude, sampling date, province, and ecozone for the 69 lakes examined in the manuscript: Changes in midge assemblages reflect climate and trophic gradients across north temperate and boreal lakes since the pre-industrial period. </p>
Figure 3 in Intense inhabitation and relaxed host-leaf preference of aquatic chironomid leaf-miners in headwater streams in Asian lucidophyllous forests
Figure 3. Frequency distributions of unmined (open) and mined (solid) leaves among representative plant species. (Cs, Castanopsis sieboldii; Qg, Quercus glauca; Qm, Quercus miyagii; Mj, Machilus japonica; Mt, Machilus thunbergii; Mr, Myrica rubra; Ot, others.)
Figure 2 in Intense inhabitation and relaxed host-leaf preference of aquatic chironomid leaf-miners in headwater streams in Asian lucidophyllous forests
Figure 2. Habitats and leaf-mining habits of Stenochironomus okialbus. (A–B) headwater streams at S4 and S9; (C) submerged litter at S9; (D–F) leaf-mines; (G) a larva undulating in a mine; (H) a pupa; (I) head of a mining larva; (J–K) a female and a male adult midge. Plant species of the leaves: C, D, G, I: Castanopsis sieboldii; E, H: Dendropanax trifidus; E: Myrica rubra.
Figs 1–7 in Pagastia Tianmumontana Sp. N. - A New Species Of Chironomids (Diptera: Chironomidae: Diamesinae) From South China
Figs 1–7. Details of the hypopygium structure of Pagastia (s. str.) tianmumontana sp. n. 1, 3 – hypopygium, dorsal view; 2 – lateral aedeagal lobes of phallapodemes; 4–7 – gonostylus in varies positions. Scale bar 50 µm
Рис. 2. Ментум Λичинок роΑа Chironomus из озера Кенон Fig. 2. Mentum of the Chironomus genus larvae from Lake Kenon in Toxic pollution assessment of Chita TPP-1 cooling reservoir by applying the method of head capsule morphological deformations in chironomid larvae
Рис. 2. Ментум Λичинок роΑа Chironomus из озера Кенон Fig. 2. Mentum of the Chironomus genus larvae from Lake Kenon
Рис. 1. Схема мониторинговых станций на озере Кенон: 1–1.6 — ТЭЦ; 2–2.1 — КСК; 3 — Нефтебаза; 4 — Центр озера; 5 — КаΑаΛинка Fig. 1. Diagram of monitoring stations on Kenon lake: 1–1.6 — TPP; 2–2.1 — KSK; 3 — Tank farm; 4 — Lake Center; 5 — Kadalinka in Toxic pollution assessment of Chita TPP-1 cooling reservoir by applying the method of head capsule morphological deformations in chironomid larvae
Рис. 1. Схема мониторинговых станций на озере Кенон: 1–1.6 — ТЭЦ; 2–2.1 — КСК; 3 — Нефтебаза; 4 — Центр озера; 5 — КаΑаΛинка Fig. 1. Diagram of monitoring stations on Kenon lake: 1–1.6 — TPP; 2–2.1 — KSK; 3 — Tank farm; 4 — Lake Center; 5 — Kadalinka
Fig. 3 in The Oriental Genus Shangomyia Saether & Wang (Chironomidae: Diptera): Immature Stages, Biology, Putative Relationships And The Evolution Of Wood Mining In Chironomid Larvae
Fig. 3. Reduced phylogeny for Chironominae, strict consensus, all characters unordered. Abbreviations – 'Pseu' – 'Pseudochironomini', a paraphyletic grade on these data; 'INF' – monophyletic clade, 'K1', Imparipecten, Nilodosis, Fissimentum; SSH – monophyletic clade, Stenochironomus, Shangomyia, Harrisius. 'connectens' 1 and 2 – an informal grouping, possibly monophyletic but unresolved in this analysis, comprising 1. Polypedilum, Pagastiella and relatives, and 2 Stictochironomus and relatives with 6-segmented larval antenna and alternate Lauterborn organs.
Fig. 2 in The Oriental Genus Shangomyia Saether & Wang (Chironomidae: Diptera): Immature Stages, Biology, Putative Relationships And The Evolution Of Wood Mining In Chironomid Larvae
Fig. 2. Shangomyia impectinata Saether & Wang, 1993, Pupa, male hypopygium; A. Tergites, dorsal; B. anterior tergite IV; C. posterior tergite VI. D. Male hypopygium, left side dorsal, right side ventral/ stylised internal.
Figure 3. Chironomid and aphid types from Yantardakh. A in Kamyristi and Yakutia: Siberian amber studies in 2020-2024
Figure 3. Chironomid and aphid types from Yantardakh. A - Chironomid Mesoacentron kaluginae Giłka et al., 2021, holotype. B - Aphid Canadaphis mordvilkoi Kononova, 1976, neotype.
Figure 3 in Evidence of new chironomid taxa (Diptera, Chironomidae) for Croatia from a mountain stream in the Pannonian Plain
Figure 3. Morphological characteristics of Diamesa cf. insignipes: a) larval head ventral view, b) posterior abdominal segment, c) mandible and premandible, d) labro-epipharyngeal area.
Figure 2 in Evidence of new chironomid taxa (Diptera, Chironomidae) for Croatia from a mountain stream in the Pannonian Plain
Figure 2. Morphological characteristics of Boreoheptagyia legeri: a) dorsal surface of head, b) larval head, ventral view, c) posterior abdominal segments, d) mandible.
Figure 1 in Evidence of new chironomid taxa (Diptera, Chironomidae) for Croatia from a mountain stream in the Pannonian Plain
Figure 1. Šumetlica stream: location of the study site in Croatia (black dot), sampling site in June 2020 (left), sampling site in May 2021 (right).
Figs 1, 2 in Chironomid community (Diptera: Chironomidae) of temporary stream of Southern Primorye, Russian Far East
Figs 1, 2. Gornotaezhnoe village (Mountain-Taiga Station). 1 – temporary stream flowing along the road; 2 – sampling using the GR-91 rod bottom scoop.
Figs 18–20 in New chironomid flies in Early Cretaceous Lebanese amber (Diptera: Chironomidae)
Figs 18–20. Cretadiamesa arieli gen. et sp. n., male, holotype 365: (18) general habitus, scale bar = 0.5 mm; (19) wing, scale bar = 0.3 mm; (20) details of male genitalia, scale bar = 0.1 mm.
Figs 15–17 in New chironomid flies in Early Cretaceous Lebanese amber (Diptera: Chironomidae)
Figs 15–17. Libanodiamesa deploegi gen. et sp. n., holotype 66: (15) general habitus; (16) forewing; (17) details of forewing venation. Scale bars = 0.5 mm.
Figs 1–3 in New chironomid flies in Early Cretaceous Lebanese amber (Diptera: Chironomidae)
Figs 1–3. Libanopelopia cretacica gen. et sp. n., holotype HAR 2: (1) details of general habitus; (2) wing; (3) general habitus. Scale bars = 1 mm in Figs 1, 3 and 0.5 mm in Fig. 2.
Fig. 9 in New chironomid flies in Early Cretaceous Lebanese amber (Diptera: Chironomidae)
Fig. 9. Lebanorthocladius furcatus gen. et sp. n., holotype 5B, general habitus, scale bar = 0.5 mm.
Figs 4–6 in New chironomid flies in Early Cretaceous Lebanese amber (Diptera: Chironomidae)
Figs 4–6. Cretapelopia salomea gen. et sp. n., holotype 309: (4) details of general habitus, scale bar = 1 mm; (5) wing, scale bar = 0.5 mm; (6) male genitalia, scale bar = 0.2 mm.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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