scholarly journals Geographical variation and sexual differences of body length and age composition in Rana temporaria: the ontogenetic development and phenotypic trends

2012 ◽  
Vol 2 (2) ◽  
pp. 22-44 ◽  
Author(s):  
Sergey Lyapkov
Keyword(s):  
Body Length ◽  
Geographical Variation ◽  
Rana Temporaria ◽  
Sexual Differences ◽  
Ontogenetic Development ◽  
Age Composition

Post-embryonic development of Lithobius curtipes C. L. Koch (Chilopoda: Lithobiidae)

1983 ◽  
Vol 14 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Göran Andersson
Keyword(s):  
Embryonic Development ◽  
Body Length ◽  
Geographical Variation ◽  
Head Length ◽  
Length Ratio ◽  
Male And Female ◽  
The Difference

AbstractThe variation during development in the following characters of Lithobills curtipes is described: body-length, head-length, ratio head-length/body-length and head-length/headwidth, number of coxal pores, ocelli, antennal articles and teeth on forcipular coxosternite, projections on tergites 9, 11 and 13, spinulation of the last pair of legs (DampP on all legs), accessory apical claws on the 15th pair of legs, genitalia and male secondary sex character. Also the difference between male and female and the correlation with size within each post-larval stadium are given. The boundary between juvenile and adult stadia, the number of post-larval stadia and some geographical variation concerning Swedish and German material are dicussed. Useful characters for identifying L. curtipes and L. crassipes are also discussed.

Post-embryonic development of Lithobius microps Meinert (Chilopoda: Lithobiidae)

1982 ◽  
Vol 13 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Göran Andersson
Keyword(s):  
Embryonic Development ◽  
Body Length ◽  
Geographical Variation ◽  
Head Length ◽  
Length Ratio ◽  
Head Width ◽  
Male And Female ◽  
The Difference ◽  
Cephalic Shield

AbstractThe variation during development in the following characters of Lithobius microps is described: body-length, head-length, ratio head-length/body-length and head-length/ head-width, number of coxal pores, ocelli, antennal articles and teeth on forcipular coxosternite, projections on tergites 9, 11 and 13, spinulation on the last pair of legs, accessory apical claws on the 15th pair of legs, genitalia and the pattern on the cephalic shield. Also the difference between male and female and the correlation with size within each post-larval stadium are given. The boundary between juvenile and adult stadia, the number of post-larval stadia and the geographical variation in the number of antennal articles and coxal pores are discussed.

Abnormal Migration in Polystoma integerrimum

1959 ◽  
Vol 33 (2-3) ◽  
pp. 205-206 ◽  
Author(s):  
Joan B. Williams
Keyword(s):  
Body Length ◽  
Alimentary Canal ◽  
Rana Temporaria ◽  
Ventral Surface ◽  
The Body ◽  
Laboratory Conditions ◽  
Total Length ◽  
Stage Of Development ◽  
The Right

Rana temporaria tadpoles which had been naturally infected by larvae of Polystoma integerrimum were kept in the laboratory under conditions precluding the continuous re-infection which occurs in nature. One tadpole was seen to have two larvae attached to the skin of the ventral surface of the body, which were moving towards the posterior end. The tadpole measured 7·9 mm. in body length and 20·8 mm. in total length, and its stage of development corresponded to stage 5 in the table of development and metamorphosis compiled by Rugh (1951); it was collected in mid-May and had been kept for twelve days under laboratory conditions. The tadpole was fixed and dissected: the bladder had not developed, and the gills showed no indication of atrophy; the alimentary canal was long and heavily coiled, and filled with food. In addition to the two larvae observed on the skin, one larva was found in the branchial chamber, two were in the cloacal tube, seven occupied the cloacal chamber and two had travelled up the right ureter to the kidney; the alimentary canal was free of larvae. All fourteen larvae were gyrodactyloids.

The Development of Integumental Pore Signatures in the Genus Pleuromamma (Copepoda: Calanoida)

1995 ◽  
Vol 75 (1) ◽  
pp. 211-218 ◽  
Author(s):  
Jeung Sook Park
Keyword(s):  
Adult Stage ◽  
Sexual Differences ◽  
Ontogenetic Development ◽  
Calanoid Copepods ◽  
Interspecific Differences ◽  
Species Specific

Most studies on the pore signature of calanoid copepods have been made on adult femalessemicolon very little is known of the ontogenetic development of the pore signatures and their sexual differences. Males, females and copepodids of five species in the metridinid genus Pleuromamma are examined. Interspecific differences in the pore signatures occur as early as copepodid III. Differences in the signatures of the copepodids arise from two sources: (1) species-specific rates of development of the adult signaturesemicolon (2) development of the species-specific components of the adult signature. The cephalosomal signature is complete in copepodid V, and the metasomal and urosomal signatures are complete in copepodid VI, the adult stage. Sexual differences in the pore signature are found in copepodid IV and are primarily evident in the urosome of the adult. The species-specific components of the urosomal signature are greater in the female than in the male.

Growth-pattern variation in two species of Rheumatobates (Heteroptera: Gerridae) with different degrees of sexual dimorphism

2008 ◽  
Vol 140 (3) ◽  
pp. 380-384 ◽  
Author(s):  
M.S. Iglesias ◽  
F.A. Crespo
Keyword(s):  
Sexual Dimorphism ◽  
Body Length ◽  
Growth Pattern ◽  
Growth Patterns ◽  
Sexual Differences ◽  
Allometric Analysis

AbstractGrowth patterns of Rheumatobates crassifemur crassifemur Esaki and R. bonariensis (Berg) were compared in a multivariate framework. Study of allometric coefficients in R. bonariensis showed sexual differences biased towards males in antennal and foreleg segments and biased towards females in body length and middle-leg segments. Multivariate allometric analysis of female growth patterns detected variation among species in those characters that are strongly modified in males of R. c. crassifemur. We show that sexual morphology diverges as of nymph V in R. c. crassifemur but only in the adults of R. bonariensis.

scholarly journals Characteristics of biology of goldfish Carassius auratus (L.) in small rivers of the Kuibyshevsky water reservoir basin

2020 ◽  
Vol 0 (1) ◽  
pp. 17-26
Author(s):  
Vjatscheslav Kuznetsov ◽  
Vladimir Kuznetsov
Keyword(s):  
Body Length ◽  
Carassius Auratus ◽  
Water Reservoir ◽  
The Body ◽  
Small Rivers ◽  
Kuibyshev Reservoir ◽  
Age Composition ◽  
Goldfish Carassius Auratus ◽  
Reservoir Basin ◽  
Average Body

The article touches upon the problems of breeding goldfish Carassius Auratus (L.), abundance of juveniles, size and age composition of the catches and the growth of this species in small rivers (for example, the Kazanka River and the lower reaches of the Sviyaga River) in terms of stocking the Kuibyshev Reservoir by goldfish. It has been stated that the process of stocking small rivers with goldfish has much in common with that in the reservoir. Spawning in the Kazanka in 2016 proceeded in two stages, and the gonads contained the roe of 2 portions. The first mass spawning took place from 11 to 20 May, and the second spawning – from 11 to 20 June. Macrophytes, driftwood and washed away roots of trees served as substrate for spawning. During the reproduction period of the species in the river the proportion of females made 75.0%, males - 25.0%. In the lower reaches of the Sviyaga in the period of 1998-2001 the proportion of males in catches made 26.1-65.7%. The maximum number of goldfish larvae and fingerlings in the lower reaches of the Sviyaga was observed in 2007-2009 and in 2014. These years had a similar regime of water level, but different temperature conditions in the spring period. Males in the catches had smaller sizes and body weight, compared with females. In the Kazanka in 2013-2016 the average body length of females in catches ranged within 16.7-23.8 cm, and males – within 15.9-20.6 cm. The age composition of goldfish in the river in 2013 consisted of 4-8 summer fish of 2006-2008 generations. Among them prevailed individuals at the age of 6 (53.1%) of the 2006 generation. In 2014-2016 in the catches there were fish aged 6-9 years old, although there were individuals up to 15 years old. The body length of the similar aged individuals of both sexes was not significantly different. Student criterion between both sexes at different ages ranged from 0.06 to 0.84. Growth of individuals of different generations in 2007-2010 also did not differ reliably. Thus, the average body size of 6- year-old fish of these generations ranged from 17.7 to 18.1 cm. The growth of goldfish in different reaches of the Kuibyshev Reservoir was higher than in the Kazanka, but Fulton fatness coefficient in the river was lower. The average values of the fatness coefficient ranged from 3.24 to 3.63 in the river, and in the reservoir reaches they are from 2.93 to 3.07.

Post-embryonic development and geographical variation in Sweden of Lithobius crassipes L. Koch (Chilopoda: Lithobiidae)

1981 ◽  
Vol 12 (4) ◽  
pp. 437-445 ◽  
Author(s):  
Göran Andersson
Keyword(s):  
Embryonic Development ◽  
Body Length ◽  
Geographical Variation ◽  
Head Length ◽  
Length Ratio ◽  
Male And Female ◽  
South Eastern ◽  
Taxonomical Status ◽  
The Difference ◽  
Cephalic Shield

AbstractThe variation during development in the following characters of Lithobius crassipes is described: body-length, head-length, ratio head-length/body-length and head-length/headwidth, number of coxal pores, ocelli, antennal articles and teeth on forcipular coxosternite, projections on tergites 9, 11 and 13, spinulation on the last pair of legs (DampP on all legs), accessory apical claws on the 15th pair of legs, genitalia and the pattern on the cephalic shield. Also the difference between male and female and the correlation with size within each post-larval stadium are given. The boundary between juvenile and adult stadia and the number of post-larval stadia are discussed. L. crassipes shows a geographical variation in Sweden and can be divided into western and south-eastern groups (W and SE). There are differences between the two groups especially in spinulation and pattern on the cephalic shield. So far there is no decision of their taxonomical status.

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