Search results for " zoology"
showing 10 items of 2242 documents
Comparison of degrees of maturity of rabbit lines selected for different traits
2015
[EN] The aim of this work was to study whether commercial nucleus lines of rabbits selected for different traits, and experimental lines having commercial purposes, have the same degree of maturity when compared at the same slaughter age. The study was carried out with 17897 rabbits from Universitat Politècnica de València. Rabbits came from the maternal lines A (3902 rabbits; 44th generation), V (4238 rabbits; 39th generation) and LP (6115 rabbits; 9th generation), selected for litter size at weaning; the paternal line R (2023 rabbits; 25th generation), selected for growth rate between 28 and 63 days of age; the maternal line OR (586 rabbits; 11th generation) selected for ovulation rate; a…
Resurrection of Pomphorhynchus tereticollis (Rudolphi, 1809) (Acanthocephala: Pomphorhynchidae) based on new morphological and molecular data
2011
Abstract Pomphorhynchus tereticollis (Rudolphi, 1809) is here redescribed on the basis of Rudolphi’s material, deposited in the Museum für Naturkunde Berlin, and on acanthocephalans recently collected from the type host Platichthys flessus (L.) and the region embodying the type locality. Out of the paratypes of P. tereticollis, the lectotype and paralectotypes have been designated. Their morphology fits well with that of newly collected material of P. tereticollis dissected from the type fish host from the Baltic coast near Stralsund. The resurrection of P. tereticollis, previously considered a synonym of Pomphorhynchus laevis (Zoega in Müller, 1779), is supported by several morphological f…
Gender-related variations in hemolymph parameters of Carabus lefebvrei (Coleoptera: Carabidae): HPLC analysis and phenoloxidase activity
2017
We characterized the enzymatic activity of basal and total phenoloxidase and HLPC and SDS- PAGE profiles in hemolymph of Carabus lefebvrei males and females at different reproductive status. The phenoloxidase activity was activated by trypsin and inhibited by phenoloxidase activity specific inhibitor phenylthiourea. Our results demonstrated that both in males and females, there were no significant differences in the basal phenoloxidase activity between reproductive and virgin beetles, while the total phenoloxidase activity increased significantly in virgin specimens. Thus, resources seem to be invested to increase the humoral response in pre-reproductive phase forming a barrier against path…
Difficulty of getting accurate and precise estimates of population size: The case of the Siberian flying squirrel in Finland
2008
Accurate estimates of population size and distribution are a prerequisite for effective management of populations, but for most species a reliable estimation of the absolute population size is very difficult. In 1998, the Finnish Ministry of Environment set up a working group to plan a national-level survey for estimation and monitoring of the population size of Siberian flying squirrel (Pteromys volans). In 2006, the population size was reported to be 143 000 females. However, evaluation of the magnitude of possible biases was not attempted. Our aim was to test the population size estimate by conducting a resampling study with the methods of the national survey on an eartagged population o…
Vendace (Coregonus albula) Disperse Their Eggs Widely during Spawning
2021
Depending on their reproductive strategy, different fish species either aggregate or disperse eggs and larvae in their reproductive habitat. Because yolk-sac larvae of vendace (Coregonus albula) disperse widely across the littoral and pelagic zones of boreal lakes, it is unclear where the exact spawning and egg incubation locations are. Vendace egg and larvae densities were studied in Lake Southern Konnevesi to clarify its spawning strategy. In autumn 2019, 1–2 weeks prior to spawning, 500 egg samplers were installed in five depth zones in 20 sampling plots. Fertilized eggs were found in 18 plots. The mean density of eggs was 74 eggs m–2 and the mean fertilization rate 85%. During spawning,…
Genome-wide mapping of signatures of selection using a high-density array identified candidate genes for growth traits and local adaptation in chicke…
2023
Abstract Background Availability of single nucleotide polymorphism (SNP) genotyping arrays and progress in statistical analyses have allowed the identification of genomic regions and genes under selection in chicken. In this study, SNP data from the 600 K Affymetrix chicken array were used to detect signatures of selection in 23 local Italian chicken populations. The populations were categorized into four groups for comparative analysis based on live weight (heavy vs light) and geographical area (Northern vs Southern Italy). Putative signatures of selection were investigated by combining three extended haplotype homozygosity (EHH) statistical approaches to quantify excess of haplotype homoz…
Risk assessment of information on the subcombination Bt11 × 1507 × GA21, related to the application of Syngenta (EFSA‐GMO‐DE‐2011‐99) for authorisati…
2017
Efsa Panel On Genetically Modified Organisms (gmo)StatementRequestor: European CommissionQuestion number: EFSA-Q-2016-00730; The EFSA Panel on Genetically Modified Organisms (GMO) has previously assessed the single events Bt11, MIR162, MIR604 and GA21 as well as different stacked events corresponding to combinations of these events. These maize events were found to be as safe as their conventional counterparts and other appropriate comparators with respect to potential effects on human and animal health and the environment. In its assessment of the four-event maize stack Bt11 9 MIR162 9 MIR604 9 GA21, the GMO Panel also assessed all the subcombinations of these events not previously assesse…
Zur Balz des Mikado-Fasans(Syrmaticus mikado) in Gefangenschaft
1984
Drei Jahre lang wurde das Balzverhalten von 20 in Volieren gehaltenen Mikado-Fasanen (Syrmaticus mikado) beobachtet. Die Hauptbalzzeit war bei den ganzjahrig im Freien gehaltenen Fasanen in Mainz (50° N.) Marz-April. Die Balz der ♂ bestand nicht wie bisher angegeben im wesentlichen aus einer Lateralprasentation. Zwar wurde eine solche auch im Rahmen des Balzverhaltens gezeigt, doch stellte sie keine eigentliche Balzleistung dar. Sie trat vielmehr wahrend des ganzen Jahres hindurch mehr oder weniger auf, und zwar bei beiden Geschlechtern. Ein wesentliches Element der Balz war dagegen die Frontalprasentation, die hier erstmals beschrieben wird. Sie trat nur wahrend der Balz auf und wurde nur …
Phylloscopus borealoides Portenko — ein verkannter Laubsänger der Ost-Paläarktis
1988
Ussuri-Laubsanger (Phylloscopus tenellipes) vom ostsibirischen Festland und von den Inseln des Japanischen Meeres (Sachalin, S-Kurilen, Hokkaido, Hondo) sind morphologisch kaum unterscheidbar, in der Stimme jedoch auserst verschieden. Die Festlandsform besitzt einen Heuschrecken-ahnlichen Schwirrer, die Inselform eine Serie heller Pfiffe. Da auch die Rufe betroffen sind, wird auf wenigstens partiell genetische Basis der Unterschiede geschlossen. Fur beide Formen kommt nach der Struktur der Gesange Anpassung an stark gerauschbelastete Biotope in Frage, z. B. den Uferbereich von Gebirgsbachen. Obwohl der Sympatrie-Nachweis bisher aussteht, sind die Argumente gravierend, beide Formen als eigen…
Pnoepyga immaculata n. sp., eine neue bodenbewohnende Timalie aus dem Nepal-Himalaya
1991
Pnoepyga immaculata n. sp. lebt im Areal der beiden anderenPnoepyga-Artenalbiventer (Hodgson 1837) undpusilla Hodgson 1845 und wurde durch ihren markant abweichenden Territorialgesang entdeckt. Sie besitzt eine kurze silberhelle Strophe aus kurzen, in gleichmasigen Abstanden gereihten Pfiff-Elementen, die in der Frequenz leicht abfallt. Neben der Stimme liegen die wesentlichen diagnostischen Merkmale nach jetzigem Kenntnisstand gegenuber sympatrischenalbiventer in wenig groserem Schnabel, der Fleckenlosigkeit von Oberseite, Kopf und Flugeldecken, gegenuberpusilla in den groseren Korperabmessungen, gegenuber sympatrischenalbiventer undpusilla im schwachen grunlichen Schimmer der Oberseite un…