scholarly journals Toxic pollution assessment of Chita TPP-1 cooling reservoir by applying the method of head capsule morphological deformations in chironomid larvae

2020 ◽  
Vol 12 (2) ◽  
pp. 201-210
Author(s):  
Petr V. Matafonov ◽  
Aleksandr B. Shoydokov
Keyword(s):  
Pollution Assessment ◽  
Head Capsule ◽  
Chironomid Larvae ◽  
Toxic Pollution ◽  
Cooling Reservoir

Does salinity affect body proportions and “size/mass” ratios of highly halotolerant Baeotendipes noctivagus larvae (Diptera, Chironomidae)?

2019 ◽  
Vol 48 (4) ◽  
pp. 305-315 ◽  
Author(s):  
Nickolai V. Shadrin ◽  
Victor P. Belyakov ◽  
Alexandra I. Bazhora ◽  
Elena V. Anufriieva
Keyword(s):  
Body Length ◽  
Parabolic Equations ◽  
Head Capsule ◽  
The Body ◽  
Water Bodies ◽  
Generalized Equations ◽  
Body Proportions ◽  
Chironomid Larvae ◽  
Mass Ratios ◽  
Length Width

Abstract Measuring the linear characteristics of chironomid larvae is easier and faster than measuring their mass. The relationships between them are approximated by parabolic equations. Generalized equations are provided for all chironomid larvae. However, these relations vary in different water bodies. Measurements of 1424 chironomid larvae representing several species were taken in Crimean waters with salinity ranging from 0 to 280 PSU. There was a high correlation between three traits. In the case of Baeotendipes noctivagus and Cricotopus gr. sylvestris, dimorphism was found in the “head capsule length– width” relationship. Salinity affects the head capsule. The exponent “b” varied from 1.43 to 3.06 in the “body length-mass” equation for B. noctivagus, and from 1.943 to 2.592 for C. gr. sylvestris. It is inappropriate to use only one coefficient “b” for all chironomid larvae. In B. noctivagus and Paratanytarsus confuses, the mass of one-size larvae decreased with increasing salinity. Salinity is not the only factor affecting the size and mass of chironomid larvae.

THE OCCURRENCE OF CHARACTERISTIC DEFORMITIES IN THE CHIRONOMID LARVAE OF SEVERAL CANADIAN LAKES

1971 ◽  
Vol 103 (3) ◽  
pp. 363-368 ◽  
Author(s):  
Andrew L. Hamilton ◽  
Ole A. Saether
Keyword(s):  
British Columbia ◽  
Lake Erie ◽  
Body Wall ◽  
Head Capsule ◽  
Industrial Chemicals ◽  
Chironomid Larvae ◽  
Okanagan Valley

AbstractSeverely deformed chironomid larvae have been collected in Lake Erie and two lakes in the Okanagan valley of British Columbia. Deformed larvae had very aberrant mouthparts and the head capsules were usually heavily pigmented. In most cases both the head capsule and body wall were many times thicker than in normal specimens. These deformities are apparently caused by pollutants and it is speculated that agricultural and/or industrial chemicals may be responsible.

Two new aphrotenian larval types from Chile and Queensland, including Anaphrotenia lacustris n.gen., n.sp (Diptera: Chironomidae)

1983 ◽  
Vol 14 (4) ◽  
pp. 415-433 ◽  
Author(s):  
Lars Brùndin
Keyword(s):  
Morphological Traits ◽  
New Genus ◽  
Head Capsule ◽  
The Other ◽  
Mountain Streams ◽  
New Genus And Species ◽  
Chironomid Larvae ◽  
Subtropical Lake ◽  
Closed Head ◽  
Group A

AbstractTwo as yet unknown larvae of the circum-Antarctic subfamily Aphroteniinae, one belonging to Paraphrotenia cf. excellens Brundin, the other representing the new genus and species Anaphrotenia lacustis, are described. While the other members of the subfamily are confined to mountain streams, the larva of anaphrotenia has been found in the littoral zone of a shallow subtropical lake on Fraser Island off the coast of Queensland. Besides some peculiar specializations this larva attracts interest because of the primitive construction of the head capsule where the genae ventrally are widely separated and the wide medial interspace is occupied by a longitudinal postmental plate that is not fused with the genal margins. In these respects the Anaphrotenia larva stands out as the most plesiomorphic chironomid larva as yet known; and it comes probably rather close to the larva of the dipteran ancestor. With its closed head capsule and specialized mouth parts the predatory Paraphrotenia larva appears much more apomorphic. But it retains several comparatively plesiomorphous characters, and among the predatory species of the chironomid larvae it represents a very remarkable type. In both genera the crop is developed as a diverticulum from the oesophagus. The presence of a special, sac-like grinding mill at the caudal end of the crop in both genera seems to be unique. — The paper ends with a discussion on a comparative basis of some aphrotenian larval characters and their anagenetic status. Special attention is paid to the mentum and the development of ventromental and dorsomental teeth within Chironomidae. Also discussed is the independent development of predatory habits and their combination with special morphological traits within different monophyletic groups. Of special interest is the comparatively late occurrence of such habits and corresponding morphological traits high up in the chironomid hierarchy within the Harnischia-group, a phenomenon that is believed to be a case of evolutionary reversal.

Diatom- and Chironomid-Inferred Eutrophication of Bouchie Lake, British Columbia

2005 ◽  
Vol 40 (4) ◽  
pp. 418-430 ◽  
Author(s):  
Markus L. Heinrichs ◽  
Brian F. Cumming ◽  
Kathleen R. Laird ◽  
J. Sanford Hart
Keyword(s):  
British Columbia ◽  
Land Use Changes ◽  
Head Capsule ◽  
Relative Increase ◽  
Nutrient Concentrations ◽  
The Past ◽  
Nutrient Levels ◽  
Lower Head ◽  
Lower Oxygen ◽  
Historical Land Use

Abstract Diatom and chironomid analysis of sediments encompassing the past 400 years from Bouchie Lake, British Columbia, suggests two distinct periods of limnological conditions. Prior to 1950 AD, Fragilaria construens and F. pinnata are the most common diatom species, and Chironomus, Procladius and Tanytarsini dominate the chironomid record. Moderately low nutrient concentrations consistent with oligo-mesotrophic lakes are inferred. From 1950, the diatom assemblage is dominated by Stephanodiscus parvus, a eutrophic indicator, whereas the chironomid communities show a relative increase in littoral taxa coincident with lower head capsule abundance. Higher nutrient levels, specifically total phosphorus, which increased from 8 µg L-1 prior to 1950 to 20 µg L-1 currently, are coincident with midge communities indicative of lower oxygen concentrations. Observed biotic changes and nutrient levels inferred from the sediment core correspond to historical land-use changes.

Rapid Pollution Assessment in Tidal Waters

1989 ◽  
Vol 21 (12) ◽  
pp. 1903-1906
Author(s):  
R. A. Dines ◽  
J. R. Wharfe
Keyword(s):  
Pollution Assessment ◽  
Tidal Waters
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