Wszystkie pola: zmienność wewnątrzgatunkowa - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Palaeontology, taxonomic revision and variability of some species of the genus Gassendiceras Bert et al., 2006 (Ammonitina, Upper Barremian) from southeastern France
Autorzy:: Bert, D.
Bersac, S.
Delanoy, G.
Canut, L.
Powiązania:: https://bibliotekanauki.pl/articles/138959.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Ammonoidea
Gassendiceratinae
Upper Barremian
south-eastern France
taxonomy
intraspecific variability
amonity
Barrem
Francja
taksonomia
zmienność wewnątrzgatunkowa
Opis:: Bed-by-bed sampling of twelve Barremian sections in southeastern France from pelagic basin (Vocontian Basin) to neritic platforms (Arc of Castellane, Arc of Nice and Provencal Domain) has enabled the collection of isochronous samples of the ammonite genus Gassendiceras. Three poorly known species of the Toxancyloceras vandenheckei Zone (Upper Barremian) are revised: G. alpinum, G. multicostatum and G. hoheneggeri; two new species are described (G. rebouleti nov. sp. and G. bosellii nov. sp.). The intraspecific variability of particular species was recognised. This variability is between slender peramorphic and robust paedomorphic extreme morphologies, with the presence of all intermediates.
Źródło:: Acta Geologica Polonica; 2013, 63, 3; 355-397
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Inter- and intra-specific variability in δ13C and δ18O values of freshwater gastropod shells from Lake Lednica, western Poland
Autorzy:: Apolinarska, K.
Pełechaty, M.
Powiązania:: https://bibliotekanauki.pl/articles/139408.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: C stable isotopes
O stable isotopes
recent gastropod shells
freshwater
inter-specific differences
intraspecific variability
lake Lednica
izotopy stabilne
izotopy węgla
izotopy tlenu
muszle ślimaków
słodkowodne
różnice międzygatunkowe
zmienność wewnątrzgatunkowa
jezioro Lednickie
Opis:: This study focuses on the inter- and intra-specific variability in δ13C and δ18O values of shells and opercula of gastropods sampled live from the littoral zone of Lake Lednica, western Poland. The δ13C and δ18O values were measured in individual opercula of Bithynia tentaculata and in shells of Bithynia tentaculata, Gyraulus albus, Gyraulus crista, Lymnaea sp., Physa fontinalis, Radix auricularia, Theodoxus fluviatilis and Valvata cristata. The gastropods selected for the study are among the species most commonly found in European Quaternary lacustrine sediments. The carbon isotope composition of the gastropod shells was species-specific and the same order of species from the most to the least 13C-depleted was observed at all sites sampled. Differences in shell δ13C values between species were similar at all sampling sites, thus the factors influencing shell isotopic composition were interpreted as species-specific. The δ18O values of shells were similar in all the species investigated. Significant intra-specific variability in shell δ13C and δ18O values was observed not only within the populations of Lake Lednica, which can be explained by heterogeneity of δ13C DIC, δ18O water and water temperature between the sites where macrophytes with snails attached were sampled, but also between individuals sampled from restricted areas of the lake’s bottom. The latter points to the importance of factors related to the ontogeny of individual gastropods.
Źródło:: Acta Geologica Polonica; 2017, 67, 3; 441-458
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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