Wyniki wyszukiwania - AGRO

1

The porotaxy in Protura - a preliminary report

100%

Szeptycki A.

Polskie Pismo Entomologiczne

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1995

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tom 64

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nr 1-4

2

Metric characteristics and sexual dimorphism of the postcranial skeleton of wild cat Felis silvestris in Bulgaria

88%

Petrov I.

Acta Theriologica

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1992

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tom 37

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nr 4

The measurements of scapula, pelvis, humerus, ulna, radius, tibia, femur, and the first three vertebrae of the adult wild cat Felis silvestris Schreber, 1777 from Bulgaria were used in this study. Considerable differences between the sexes were revealed at three levels of significance in most of the sizes of scapula, pelvis, and vertebrae. The males were bigger than the females. No significant differences were found in the limb bones, except in the length of the humerus. Widening of the female pelvis was not observed. The variability of the skeletal parts examined was found to be comparatively low for most of them.

3

Sexual dimorphism in life history plasticity in the gypsy moth [Lymantria dispar L.]

88%

Lazarevic J., Peric-Mataruga V.

Folia Biologica

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2003

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tom 51

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nr 3-4

4

Morphology of the first instar of Parlatoria ziziphi (LUCAS) (Hemiptera: Coccinea: Diaspididae)

75%

Podsiadlo E., Bugila A. A. A.

Polish Journal of Entomology

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2007

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tom 76

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nr 4

The first instar of Parlatoria ziziphi (LUCAS) is described and illustrated. It has 5- segmented antennae, 1 trilocular disc pore associated with anterior spiracle, 2nd and 3rd lobes welldeveloped, broad and fringed plates present in interlobular spaces and anterior to lobe 3. It is distinguished by the lack of dorsal submedian setae on abdominal segments 4-7, and by the presence of ventral submedian setae on meso- and metathorax, and on abdominal segments 2-7. Sexual dimorphism in the first instar is exhibited through two characteristics: a campaniform sensillum present at the bases of the tarsi in male nymph, but absent in female nymph, and a pair of dorsal submedian setae on the 1st abdominal segment present in male nymph, but absent in female nymph.

5

Body size variation of European Storm Petrels Hydrobates pelagicus in relation to environmental variables

75%

Jakubas D., Wojczulanis-Jakubas K., Jensen J.-K.

Acta Ornithologica

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2014

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tom 49

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nr 1

Body size differentiation may have developed in response to environmental gradients. A pattern of large individuals prevailing in colder areas is often observed and is explained by the heat conservation hypothesis (Bergmann's rule). To understand patterns driving body size variation in a pelagic seabird, the European Storm Petrel Hydrobates pelagicus, we examined the relationship between wing length, body mass and environmental variables in breeding areas (sea surface temperature, air temperature and wind speed). As this species has been divided into two subspecies: Mediterranean H. p. melitensis and Atlantic H. p. pelagicus, we performed the analyses at different scales (species, Atlantic subspecies and regional North Atlantic). At the species and subspecies scales, there was a longitudinal increase in wing length from west to east. At the subspecies and regional scale, we found a latitudinal increase in this variable from south to north. This result and the significant increase of wing length with decreasing sea surface and air temperatures are concordant with Bergmann's rule. In addition, body mass at the species and subspecies scales decreased with increasing wind speed, what may have a functional implication (small body mass may increase manoeuvrability over waves in conditions of stronger wind). Both genetic (two subspecies differing in body size) and environmental factors seem to be important forces driving intercolony variation in body size. Our study on sexual size dimorphism (SSD) revealed that in 156 molecularly sexed adults from the Faeroes, wing and tail length, and body mass exhibited female-biased SSD, while head-bill length showed male-biased SSD. The best discriminant function for sexing based on body measurements correctly classified 75% of individuals. Considering low correctness of proposed functions and geographical variation of body size, use of alternative methods (e.g. molecular tools) is recommended for sex discrimination in the European Storm Petrel.

6

Morphometric study of wing venation in the recent Trichoceridae - an application to the fossils ?

75%

Krzeminska E.

Acta Zoologica Cracoviensia

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1992-1993

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tom 35

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nr 1

7

Growth, size, and fat reserves of the raccoon dog in Finland

75%

Kauhala K.

Acta Theriologica

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1993

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tom 38

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nr 2

The growth, size, and fat reserves of the raccoon dog Nyctereutes procyonoides (Gray, 1834) were studied in Finland in period 1986 - 1990. There was no sexual dimorphism in mean body size. Juveniles reached the mean adult body length at the age of 5 - 7 months. The weather in spring seemed to cause both annual and regional variation in the weight and fat reserves of juveniles in late autumn. Some of these differences could be seen as late as the following March, the breeding season of raccoon dogs. The adults had the least fat reserves in May and the most in October — November. The abundance of food, especially that of voles in early spring, seemed to affect the fat reserves of adult females in March.

8

Differences between properties of male and female motor units in the rat medial gastrocnemius muscle

75%

Celichowski J., Drzymala H.

Journal of Physiology and Pharmacology

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2006

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tom 57

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nr 1

Differences between motor units in hindlimb locomotor muscles of male and female Wistar rats were studied. The contractile and action potential properties of various types of motor units as well as proportions of these units in the medial gastrocnemius muscle were analyzed. Experiments were based on functional isolation and electrical stimulation of axons of single motor units. Composition of motor units was different for male and female subjects, with higher number of the fast fatigable and lower number of slow type units in male animals. The contraction and the half-relaxation times were significantly longer in male motor units, what might be due to differences in muscle size. Slower contraction of male motor units likely corresponds to lower firing rates of their motoneurons. On the other hand, no significant differences between sexes were observed with respect to force parameters of motor units (the twitch and the maximum tetanus forces), except the fast resistant units (higher force values in male muscles). The mass of the muscle was approximately 1.5 time bigger in male rats. However, the mean ratio of motor unit tetanus force to the muscle mass was almost twice smaller in this group, what indirectly suggests that muscles of male rats are composed of higher number of motor units. Finally, female muscles appeared to have higher fatigue resistance as the effect of higher proportion of resistant units (slow and fast resistant) and higher values of the fatigue index in respective motor unit types. The motor unit action potentials in female rats had slightly lower amplitudes and shorter time parameters although this difference was significant only for fast resistant units.

9

Craniometrical sex determination of wild cat Felis silvestris in Bulgaria

75%

Petrov I., Nikolov H., Gerasimov S.

Acta Theriologica

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1992

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tom 37

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nr 4

Analyses were made of 118 skull measurements of adult wild cats Felis silvestris Schreber, 1777 from Bulgaria, taken on 24 males, 20 females, and 10 animals whose sex was not known in advance. Group (cluster) analysis of cases, factor analysis, and stepvise discriminant analysis were adapted. The cluster analysis of cases indicated a high level of sex mixture (up to 40%), which suggested the importance of the outliers in the data. Six keys to sexual dimorphism, of very high statistical significance were produced, through the stepvise discriminant analysis. They included from 9 down to 1 variables each, which provided from 100% down to 93.8% of correct sex classification of wild cat skulls.

10

Redescription of Aulonothroscus laticollis [Rybinski, 1897] [Coleoptera: Throscidae]

75%

Burakowski B.

Annales Zoologici

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2000

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tom 50

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nr 1

Aulonothroscus laticollis (Rybiński, 1897) is redescribed and illustrated based on newly collected material in the Białowieża Primeval Forest, Poland. Its female is described for the first time.

11

Mirosphinctes Schindewolf et Euaspidoceras Spath du Niveau Vert de Zalas [Pologne] [Oxfordien Inferieur, zone a cordatum]: dimorphes sexuels?

75%

Bonnot A., Neige P., Tarkowski R., Marchand D.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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1994

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tom 42

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nr 3

12

Morphology of the second instar larva of Quadraspidiotus zonatus [Hemiptera: Coccinea: Diaspididae]

75%

Podsiadlo E.

Polskie Pismo Entomologiczne

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2000

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tom 69

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nr 4

13

A new species of Rhopalobates Fairmaire (Coleoptera: Tenebrionidae) from Burma and Bhutan

63%

Schawaller W.

Annales Zoologici

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2009

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tom 59

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nr 3

A new species of the tenebrionid genus Rhopalobates Fairmaire, 1897 (tribe Cnodalonini Gistel, 1856, subfamily Stenochiinae Kirby, 1837) is described from Burma and Bhutan. Until now only the type species R. villardi Fairmaire, 1897 was known, distributed over a wider area in the eastern Himalayas (Sikkim), southern China (Sichuan, Fujian, Guangdong) and in Indochina. Both species display a distinct sexual dimorphism.

14

Differences in troglomorphism and sexual dimorphism in two sympatric subtroglophile crickets of genus Troglophilus (Insecta: Orthoptera)

63%

Jugovic J., Sumer N.

Polish Journal of Ecology

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2021

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tom 69

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nr 1

15

Effects of site conditions on sexual dimorphism and sex ratio in lowland populations of Aruncus sylvestris Kostel. (Rosaceae)

63%

Marciniuk J., Marciniuk P., Rymuza K.

Polish Journal of Ecology

|

2010

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tom 58

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nr 2

Studies on sexual dimorphism in reference to vegetative features and on the sex ratio in different environmental conditions were carried out in lowland populations of dioecious species Aruncus sylvestris. It was shown that female individuals of Aruncus sylvestris produced higher flowering shoots, longer inflorescences, more leaves and longer and broader leaves than the male ones. All listed differences were statistically significant. In populations of Aruncus sylvestris growing in optimum ecological conditions (fertile and wet soil, half-light) the sex ratio M/F is close to 1:1. Changes of ecological conditions along the gradient of fertility, habitat moisture (estimated by the types of phytocoenoses) and intensity of solar radiation caused marked drift of sex structure towards the male domination. Light intensity was the crucial factor for the sex ratio in studied populations. Populations growing in half-light showed sex ratio M/F ≈ 1:1 irrespective of habitat. Those growing in shade and in full light showed significant shift to male dominance. The largest deviation from 1:1 sex ratio (M/F ≈ 1.0:0.2) was observed in extremely unfavorable habitat conditions (full sun irradiance, dry soil, strong competition from Elymus repens (L.) Gould). Obtained results demonstrated that female individuals of Aruncus sylvestris had markedly higher habitat requirements compared with the male ones.

16

Local ecotypes of roe deer populations (Capreolus capreolus L.) in relation to morphometric features and fur colouration in the centre of the Iberian Peninsula

63%

Horcajada-Sanchez F., Barja I.

Polish Journal of Ecology

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2016

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tom 64

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nr 1

The extent of the area occupied by populations of roe deer and the diversity of environments in which it lives, determine the existence of different local forms or ecotypes. In order to characterize the populations of the Guadarrama Mountains in the centre of the Iberian Peninsula we examined the morphology and fur colouration of 154 roe deer (Capreolus capreolus) based on their body size, age and sex. To determine the age of roe deer, we analyzed tooth cementum layers (incisor I1) to observe the growth lines. The remaining individual data (body size, sex and fur colouration) were obtained in the field, from animals hunted in the study area. In adult individuals, the average body weight in males was significantly higher than in females, being these weight ranges similar to those of the Iberian Peninsula and the rest of Europe. Body measurements were positively related to individuals age, but only significant differences in body girth were found between males and females. The analysis of fur colouration of dead specimens showed a high variability with four different ecotypes during the summer coat and not significant differences were found in the body size between individuals with different summer coats. The morphological parameters described in the roe deer of the Guadarrama Mountains do not correspond with the latitudinal gradient as it was indicated for other Spanish populations. However, the existence of Pleistocene refuges in the central mountains of the Iberian Peninsula seems to have provided a high variety of ecotypes in relation to fur colouration in the populations of Guadarrama Mountains.

17

Evaluation of the applicability of polymerase chain reaction [PCR] to sex identification in Eurasian blackbirds [Turdus merula]

63%

Dybus A., Siemierz A., Wysocki D., Szatkowska I., Muszynska M., Guenzel S.

Biological Letters

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2009

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tom 46

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nr 1

17-22

18

Structural analysis of upper respiratory tract in Anas platyrhynchos (L., 1758) and Clangula hyemalis (L., 1758)

63%

Pierko M.

Electronic Journal of Polish Agricultural Universities. Series Biology

|

2010

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tom 13

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nr 4

19

Generation of membrane-bound catechol-O-methyl transferase deficient mice with distinct sex dependent behavioral phenotype

63%

Tammimaki A., Aonurm-Helm A., Zhang F. P., Poutanen M., Duran-Torres G., Garcia-Horsman A., Mannisto P. T.

Journal of Physiology and Pharmacology

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2016

|

tom 67

|

nr 6

20

Sex ratio in goitered gazelles (Gazella subgutturosa Guldenstaedt, 1780)

63%

Blank D., Yang W.

Acta Theriologica

|

2013

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tom 58

|

nr 1

We studied the sex ratio of goitered gazelles in the naturally arid environment of Kazakhstan over a 6-year period. The main methods in our study were taking transect counts and focal observations. The sex ratio of adult goitered gazelles has demonstrated a female bias due to a much higher mortality of males of all ages, especially during years with unusually severe winters. This phenomenon is typical for many polygynous ungulates, as well as other gazelle species. Surprisingly, our data demonstrated monthly fluctuations in sex proportions, along with a bias shift from a female-dominant population during most of the year to a male-dominant population during spring. We discovered, though, that our data did not reflect any real changes in the sex ratio of the population but, instead, revealed the radical changes in behavior of pregnant females before giving birth—hiding from danger in thick shrubs or broken terrain rather than fleeing. As a result, we were not able to see many pregnant females in our spring samples (before birthing), and so received a male-biased population. During the rest of the year (after birthing), females returned to their usual behaviors of fleeing from danger that then gave us a female-biased sex ratio that reflected a more accurate status in sex proportions of the population. So, our results discovered seasonal sex difference in hiding behavior which led to a bias based on visibility.

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