The Chironomus group (Diptera: Chironomidae) in Lake Winnipeg, Canada

Zootaxa ◽  
2012 ◽  
Vol 3275 (1) ◽  
pp. 1
Author(s):  
OLE A. SÆTHER
Keyword(s):  
Adult Male ◽  
Trophic Levels ◽  
Bottom Fauna ◽  
Light Traps ◽  
Lake Winnipeg ◽  
Larval Instars

Species of the Chironomus group from Lake Winnipeg, Manitoba, Canada are listed and taxonomic and ecological notesgiven. Chironomus (C.) entis Shobanov and C. (C.) bifurcatus dominates the bottom fauna with minor occurrence of fourother larval types. Fourteen species of Chironomus Meigen, one Chaetolabis Townes, and one Lobochironomus Ryser,Wülker et Scholl; one species of Benthalia Lipina, and one Einfeldia Kieffer are present in the light traps. Chironomus(Lobochironomus) sp. and Benthalia brunneipennis (Johannsen) are described on adult male. A key to the Nearctic malesof Einfeldia, Benthalia and Chironomus subgen. Lobochironomus is presented. The significance of the different Chi-ronomus species as indicators of trophic levels is demonstrated by their distribution in Lake Winnipeg. The separation of larval instars is shown approximately to follow Dyar’s rule.

Cryptotendipes Lenz from Manitoba, Canada, with keys to known immatures of the genus (Diptera: Chironomidae)

Zootaxa ◽  
2010 ◽  
Vol 2412 (1) ◽  
pp. 1 ◽  
Author(s):  
OLE A. SÆTHER
Keyword(s):  
Additional Species ◽  
Lake Winnipeg ◽  
Male And Female ◽  
Larval Instars ◽  
Additional Information ◽  
South Indian ◽  
Senior Synonym

Cryptotendipes tuberosus sp. n. from Southern Indian Lake, Manitoba, Canada, is described in all stages and both sexes. Five additional species of Cryptotendipes Kieffer are recorded from Lake Winnipeg, and two from South Indian Lake. C. ariel (Sublette) is shown to be a senior synonym of C. darbyi (Sublette). The pupae and larvae of C. emorsus (Townes), C. casuarius (Townes), C. darbyi and C. pseudotener (Goetghebuer) are described or redescribed. The female of C. emorsus is described and additional information given on other male and female imagines. Keys are given to known pupae and larvae of Cryptotendipes. The distribution of Cryptotendipes in Lake Winnipeg is mapped and discussed. The separation of larval instars is shown approximately to follow Dyar’s rule.

Cryptochironomus Kieffer from Lake Winnipeg, Canada, with a review of Nearctic species (Diptera: Chironomidae)

Zootaxa ◽  
2009 ◽  
Vol 2208 (1) ◽  
pp. 1-24 ◽  
Author(s):  
OLE A. SÆTHER
Keyword(s):  
Additional Species ◽  
Lake Winnipeg ◽  
Larval Instars ◽  
Additional Information ◽  
Senior Synonym

Cryptochironomus imitans sp. n. from Lake Winnipeg, Manitoba, Canada, is described in all stages and both sexes. Six additional species of Cryptochironomus Kieffer, 1918 are recorded from Lake Winnipeg. C. stylifera (Johannsen, 1908) is shown to be a senior synonym of C. redekei Kruseman, 1933. The immatures of C. stylifera, C. digitatus (Malloch, 1915), C. ramus Mason, 1985, and C. curryi Mason, 1985, the male of C. ramus and the female of C. curryi are described or redescribed, and additional information given on imagines of C. stylifera, C. digitatus, C. curryi and C. blarina Townes, 1945. The male of a variety of C. ramus is described, and a pupa of C. eminentia Mason, 1985 figured. Keys are given to Nearctic males, pupae and larvae of Cryptochironomus. The distribution of Cryptochironomus in Lake Winnipeg is mapped and discussed. The separation of larval instars is shown approximately to follow Dyar’s rule.

Procladius Skuse from Lake Winnipeg, Manitoba, Canada, with keys to some females and immature stages of the genus (Diptera: Chironomidae)

Zootaxa ◽  
2019 ◽  
Vol 2726 (1) ◽  
pp. 34 ◽  
Author(s):  
OLE A. SÆTHER
Keyword(s):  
Common Species ◽  
Immature Stages ◽  
Additional Species ◽  
Lake Winnipeg ◽  
Larval Instars

Procladius (Holotanypus) rugulosus sp. n. from Lake Winnipeg, Manitoba, Canada, is described as male, female and pupa. Six additional species of Procladius Skuse are recorded from Lake Winnipeg of which 5 belong to the most common species in the lake. The immature stages of P. (Psilotanypus) bellus (Loew), P. (Holotanypus) culiciformis (L.), P. (H.) denticulatus Sublette, P. (H.) freemani Sublette, and P. (H.) sublettei Roback are redescribed. Species keys are given to sufficiently known Nearctic females, to pupae of Lake Winnipeg, and to Nearctic larvae of Procladius. The distribution of Procladius in Lake Winnipeg is mapped and discussed. The separation of larval instars is shown approximately to follow Dyar’s rule.

A new species of Lobesia Guenée, 1845 from Thailand (Lepidoptera: Tortricidae: Oletheutinae)

Zootaxa ◽  
2018 ◽  
Vol 4434 (2) ◽  
pp. 381
Author(s):  
THIPMANEE CHAROENSUB ◽  
NANTASAK PINKAEW ◽  
SUNISA SANGUANSUB
Keyword(s):  
New Species ◽  
Adult Male ◽  
Male Genitalia ◽  
Light Traps ◽  
Secondary Characters ◽  
A New Species ◽  
Insect Collection

Lobesia bisacca Charoensub and Pinkaew, n.sp., is described from Thailand. Specimens were collected in light traps in Trat Province, eastern Thailand and were deposited in the Kasetsart Kamphaengsaen Insect Collection. The new species can be distinguished from all other congeners by the unusual, long, protruding process from the base of the sacculus in the male genitalia. Illustrations of the adult, male genitalia, and male secondary characters are provided. 

scholarly journals The Influence of Vegetation and House Index on Male Mosquitoes DHF Vector Abundance on Kawengen Sub-District

2020 ◽  
Vol 9 (1) ◽  
pp. 64-70 ◽  
Author(s):  
Dyah Mahendrasari Sukendra ◽  
Yunita Dyah Puspita Santik ◽  
Bambang Wahyono Wahyono ◽  
Nur Siyam ◽  
Fitri Indrawati
Keyword(s):  
Adult Male ◽  
Sampling Technique ◽  
Fruit Trees ◽  
Population Surveillance ◽  
Vegetation Density ◽  
Light Traps ◽  
Moderate Density ◽  
Vector Population ◽  
Male Mosquito ◽  
Male Mosquitoes

The environmental conditions of an area can be a major risk factor for potential outbreaks of DHF. Dense areas with a variety of vegetation are facilitated as breeding sites and have an impact on vector density. The high of vector population give an effect the speed of transmission vector-borne diseases. DHF vector population is related to the vector DHF mating pattern. Adult male mosquitoes vector DHF plays an important role in the pattern of mating DHF. The proportion of mating between adult male and females mosquitoes is 1: 1. Thus it can be seen the density of male mosquitoes, it can be easily estimated the number of female mosquitoes which fertilize and lay eggs. Conducted using observational analytics with male mosquito population surveillance approach. This research aimed to effect of vegetation and House Index (HI) on the abundance of male mosquito populations. Adult mosquitoes taken using light traps with a total sampling technique. Using spatial vegetation analysis shows that Kawengen residents, has a variety of monoecious groups and rice fields. Variety of fruit trees (banana,mango,guava,soursop), flower plants (frangipani,hibiscus), bamboo, another plant (i.e teak). Vegetation density is in the low-moderate category. Kawengen included in the category of moderate density (HI=36%). The number of Aedes sp. male mosquitoes trapped by light traps, of the total trapped mosquito was 6.52%. Variety and density of plants give a support the abundance of male mosquitoes. As a resting and feeding place. HI in moderate density category, indicates there is a positive container or a place for laying eggs. The larvae density affects the sex ratio of mosquitoes.

scholarly journals Limnological study of Serbian oxbow shaped Lake Srebrno, with special emphasis on the benthic community composition and structure

2013 ◽  
Vol 32 (1) ◽  
Author(s):  
Vesna Martinovic-Vitanovic ◽  
Snezana Ostojic ◽  
Natasa Popovic ◽  
Maja Rakovic ◽  
Vladimir Kalafatic
Keyword(s):  
Trophic Levels ◽  
Bottom Fauna ◽  
Class Iii ◽  
Composition And Structure ◽  
Medium Level ◽  
High Level ◽  
Physical And Chemical ◽  
Limnological Study

AbstractDetailed limnological study of the Lake Srebrno (Serbia) bottom fauna was performed in March 2007. Investigations included qualitative, quantitative, and saprobiological analysis of bottom fauna communities, physical and chemical analysis of sediments and determination of chlorophyll a concentration, as well as saprobic and trophic status analyses. Samples were collected at eighteen sites distributed along a shoreline and in deeper sections of the lake. Twenty taxa from nine macroinvertebrate groups were recorded. Family Chironomidae had the biggest index of participation, the highest species diversity and the largest density of populations in benthocenoses of Lake Srebrno. Faunistic similarity between sites was estimated according to Sorensen’s Quotient of Similarity (QS). The majority of benthocenoses - 56% showed a medium level of faunistic similarity (QS = 21-60%), and 42% of benthocenoses showed a high level of faunistic similarity (QS = 61-100%). The classification of Lake Srebrno based on saprobic and trophic levels was assessed. Saprobic level was in the range from alpha-meso- to poly-alpha-mesosaprobity. The water quality of the lake ranged from class III and between IV and III class. Generally, Lake Srebrno had eutrophic status with the gradation to hypertrophy.

Notes on Canadian Ablabesmyia Johannsen, with keys to known Nearctic immatures of the genus (Diptera: Chironomidae)

Zootaxa ◽  
2011 ◽  
Vol 3069 (1) ◽  
pp. 43 ◽  
Author(s):  
OLE A. SÆTHER
Keyword(s):  
British Columbia ◽  
Valid Species ◽  
Lake Winnipeg ◽  
Larval Instars

x The immatures and males of A. (Karelia) illinoensis (Malloch), A. (K.) philosphagnos Beck et Beck, A. (K.) pulchripennis (Lundbeck), A. (A.) mallochi (Walley), A. (A.) aspera Roback, A. (A.) basalis (Walley) and A. (Asayia) annulata (Say) are redescribed and/or illustrated. A. (A.) basalis (Walley) is regarded as a valid species separate from Nearctic A. (A.) monilis auct nec (L.). Seven species of Ablabesmyia were found from Lake Winnipeg, Manitoba, 3 from Marion Lake, British Columbia while other samples from Alberta to Ontario contained no more than one species. Keys are given to Nearctic immatures of Ablabesmyia. The distribution of Ablabesmyia in Lake Winnipeg is mapped and discussed. The separation of larval instars is shown approximately to follow Dyar’s rule.

Observations on the Effect of Exposure to a Low Temperature on Laemophloeus minutus (Ol.) (Col. Cucujidae)

1954 ◽  
Vol 45 (2) ◽  
pp. 351-359 ◽  
Author(s):  
Gwyneth C. Williams
Keyword(s):  
Low Temperature ◽  
Adult Male ◽  
Developmental Stages ◽  
Instar Larva ◽  
Fourth Instar ◽  
Fourth Instar Larva ◽  
Atmospheric Humidity ◽  
Larval Instars ◽  
Limited Period

Experiment showed that all developmental stages of Lacemophloeus minutus (Ol.) can survive exposure to a temperature of + 2°C. for a limited period which varies with the instar.The egg was more susceptible to such exposure than any other stage, followed by the first, second and third larval instars and the adult, which did not differ significantly from each other, and then by the fourth-instar larva and pupa which can also be grouped together.The adult male proved 1·21 times more susceptible than the female to the effects of exposure.Atmospheric humidity did not influence the mortality of eggs or adults. Previous starvation did not affect the mortality of adults subsequently exposed to + 2°C.

On the Variation in Bottom Fauna and Fish Yield in Relation to Trophic Level and Lake Dimensions

1957 ◽  
Vol 14 (1) ◽  
pp. 1-32 ◽  
Author(s):  
F. R. Hayes
Keyword(s):  
Shallow Lakes ◽  
Primary Productivity ◽  
Quality Index ◽  
Trophic Levels ◽  
Productivity Index ◽  
Bottom Fauna ◽  
Average Depth ◽  
Fish Yield ◽  
The Mean ◽  
Fish Productivity

The relation of area to depth was studied for 500 lakes. Up to 0.3 km.2 the mean depth is constant at 3 to 4 m. This is probably an artifact due to omission of shallow lakes from study. From 0.3 to 300 km.2 the relation of depth to area is linear on a log—log plot. In the largest lakes the depths increase less proportionally.Of the three ways to study fish productivity in lakes, one, the estimate of standing crops, is usually attempted at mean depths around 1 m. Another, angling returns, centers on lakes of 3.5 m., while commercial reports come from lakes of 6.5 m. average depth, and extend to the deepest lakes.Fish records can be conveniently divided into three trophic levels, short food chain, e.g. carp, intermediate, e.g. bluegills and long, e.g. trout, bass. Records are interconvertible by use of factors. By factoring, a productivity index is calculated for some 150 lakes.The productivity index is found to be inversely proportional to mean depth on a log—log plot. Thus by correction of the PI it is possible to derive a theoretical value, called the quality index, for a standard lake 5 m. deep.The QI is intended to screen the effect of depth out of the PI and so disclose the inherent capacity of the lake. The QI values vary around unity. Lakes of mean depth under 2.5 m. are factored as of that depth, it being assumed that primary productivity due to photosynthesis goes on all the way to the bottom.A study of bottom fauna in 250 lakes in several regions gave no indication of a relation between depth and productivity.

LIFE HISTORY AND BIOLOGY OF EINFELDIA SYNCHRONA (DIPTERA: CHIRONOMIDAE)

1971 ◽  
Vol 103 (11) ◽  
pp. 1597-1606 ◽  
Author(s):  
H. V. Danks
Keyword(s):  
Life History ◽  
Adult Emergence ◽  
Population Level ◽  
Bottom Fauna ◽  
Egg Mass ◽  
Larval Population ◽  
Larval Instars ◽  
Biological Features ◽  
First Instar

AbstractEinfeldia synchrona Oliver is univoltine in a small, shallow, highly eutrophic pond near Ottawa (45°N.). Adult emergence is synchronized with slight protandry in May, and from this small pond exceeded 145,000 individuals in 1970. Emergence is inhibited experimentally at short photoperiods. More than one egg mass is produced, during a period of several days following emergence. First instar larvae, which lack ventral tubules, are at first pelagic but build cases before moulting. The remaining three larval instars possess 1 pair of ventral tubules. Larvae show a preference for central areas of the pond over 40 cm deep, and show some mobility in response to seasonal depth changes. There are arrests in the development of larvae both in winter and during summer, with cessation of feeding, penetration into the mud, and construction in winter of special sealed cocoons. Marked year to year differences in the stage reached by winter, and in the larval population level, were detected. Many of these biological features are probably widespread in Chironomini and hence of some importance in the interpretation of studies of the bottom fauna.

Sign in / Sign up

Export Citation Format

Share Document