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The morphometrics and reproduction of shrews (Sorex araneus, S. minutus, S. alpinus) was studied in Slovakia. Significant differences in weight, body length and tail length were recorded in adult and subadult shrews. Adult individuals and males had higher mean somatometric values (apart from tail length of subadults). The hind foot length was the least variable characteristic, which can be considered...
Progress in ecotoxicological research documents that crustaceans are highly vulnerable to diverse chemicals and toxicants in the environment. In particular, pollutants affecting endocrine homeostasis in crustaceans (i.e., endocrine disruptors) are intensively studied, and serious reproductive disorders have been documented. In this review, current knowledge about the endocrine regulation of the crustacean...
The effect of four sublethal concentrations (from 0.01165 to 0.3025 µg per insect, responding to LC10/10, LC10, LC30 and LC50) of the organophosphorus insecticide, fenitrothion, on Spodoptera exigua (Lepidoptera, Noctuidae) larval development and ultrastructure of follicular cells of adult female moths was tested. The most prominent malformations were: breaks in the cuticle, increased mortality during...
A total of 370 specimens of Paracobitis malapterura in the Zarrin-Gol River (east of the Elburz Mts, Iran) were caught by regular monthly collection throughout one year from November 2006 to October 2007. The specimens were then examined for age and growth, reproduction and feeding attributes. Based on otolith readings the maximum ages of the population observed were 3+ years for males and 4+ years...
Reproduction potential and biometry of somatic characteristics of the common vole Microtus arvalis were evaluated and discussed. The results were processed on the basis of an extensive material (2,171 individuals) from the whole territory of Slovakia (315 sites situated at altitudes from 100 to 1500 m above sea level). Among the somatic characteristics studied, the highest variability was found in...
The present paper discusses preliminary data on population characteristics and ecology of the meadow viper Vipera ursinii in the Romanian Danube Delta. Using line transects and the Distance software, the size of the studied population was estimated at 321 (95% confidence interval: 166–618) individuals on a 62 ha area. The sex-ratio of the population was close to 1:1 and juvenile specimens were well...
Somatic features (morphometric or meristic features, i.e., body weight, length of body, tail, hind foot and ear) and reproduction characteristics (number of embryos in uterus, reproduction potential, duration of reproduction season) are the basic attributes of the biology of a species. In the present paper, biometry of somatic characteristics and reproduction potential of two mountain vole species,...
Melampyrum pratense is one of the most successful root-hemiparasitic species of temperate Europe occurring in various habitats including both forest and open communities. The species shares its life history traits (large seeds, annuality, lack of clonality) with most of other hemiparasitic Orobanchaceae. Due to lack of vegetative propagation, the reproductive success of a M. pratense individual largely...
Reproduction and shell growth in two snail species from the family Clausiliidae differing in reproductive strategies were examined under laboratory conditions. The specimens of the oviparous species Clausilia bidentata and the ovoviviparous species Ruthenica filograna were collected in natural populations coexisting in the same area. The total time of shell growth in the specimens of C. bidentata...
A laboratory survey was done to study both day length and male effect on the reproduction of Porcellio laevis Latreille, 1804. Specimens were maintained in six climatic chambers at different photoperiods [Light:Dark (LD) 0:24, 4:20, 8: 16, 12: 12, 14: 10, 16: 8 and 24: 0] at constant temperature of 20 ± 1°C. The characterization of photoperiodic induction on the onset of reproduction in P. laevis...
The first data are provided on the gonad development of the violet snail Janthina pallida Thompson, 1840. Histological investigations were carried out on twenty-two specimens cast ashore alive in the Straits of Messina (central Mediterranean). All specimens had an ovotestis with distinct male and female gonads. In large individuals, germinative cells in different stages of spermatogenesis and flagellate...
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