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Wyszukujesz frazę "subfossil" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Description of the subfossil head shield of Alona protzi Hartwig 1900 (Anomopoda, Chydoridae) and the environmental characteristics of its finding sites
Autorzy:
Bjerring, Rikke
Nykänen, Mirva
Sarmaja-Korjonen, Kaarina
Sinev, Artem
Jensen, Karina
Nevalainen, Liisa
Szeroczyńska, Krystyna
Zawisza, Edyta
Powiązania:
https://bibliotekanauki.pl/articles/2026063.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Subfossil Cladocera
Alona protzi
head shield
description
paleolimnology
Opis:
This pa per gives a de scrip tion of the head shield of Alona protzi, a rare spe cies of Cla do cera (wa ter fleas) whose separated head shield has not yet been de scribed in de tail. Sub fos sil head shields of A. protzi were found in sedi ment cores taken from lakes in Den mark, Swe den, Fin land, Es to nia and Po land. De spite the rar ity of the spe cies this sug gests a wide dis tri bu tion of A. protzi in north ern Europe. The ecol ogy of A. protzi is poorly known. The en vi ron mental spec -trum of the find ing sites was wide and ranged from rela tively nu tri ent poor clear wa ter lakes to eutrophic tur bid wa terlakes, in di cat ing that A. protzi is not nar rowly re stricted. Most of the lakes were, how ever, meso- eutrophic with neu tral to high pH, and with a rela tively low abun dance of sub merged mac ro phytes. How ever, we can not ex clude the pos si bility that A. protzi mainly lives in ground wa ter and is only oc ca sion ally trans ported into lakes.
Źródło:
Studia Quaternaria; 2008, 25; 47-53
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unusual stable morphotype of Acroperus harpae (Baird, 1834) from Lake Mývatn, Iceland (Cladocera: Anomopoda: Chydoridae) revealed by palaeolimnological studies
Autorzy:
Sinev, A.Y.
Zawisza, E.
Einarsson, A.
Powiązania:
https://bibliotekanauki.pl/articles/2027090.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Subfossil Cladocera
Acroperus harpae
new macrophototype description
paleolimnology
Opis:
A new un usual morphotype of Acroperus harpae (Baird, 1834) was found in Lake Mývatn and its neigh bour ing Lake Budlungaflói in Ice land. This form, A. harpae f. multidentata is char ac ter ized by a very large head keel and by 5–9 denticles on the posterovental an gle of the valves in stead of 1–3 com mon for A. harpae. The new form did not dif fer from typ i cal A. harpae in the mor phol ogy of the postabdomen, head pores or any ap pend ages. A study of Lake Mývatn sed i ments rev eled that this form ex isted in the lake for at least two thou sand years.
Źródło:
Studia Quaternaria; 2012, 29; 3-7
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of Cladocera communities across a climate gradient in shallow lakes from Croatia to Hungary: a preliminary study
Autorzy:
Kövér, Csilla
Korponai, János
Katalinic, Ana
Bereczki, Csaba
Powiązania:
https://bibliotekanauki.pl/articles/2027088.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Subfossil Cladocera
cli mate change
train ing set
Opis:
Cladocera com mu ni ties in sur face sed i ments of seven lakes were sam pled from the Med i ter ra nean to north Hun gary. Con duc tiv ity, pH, pri mary ions (Ca2+, Mg2+, Na+, K+, Cl–, SO4 2–, HCO3 –, CO3 2–) and macrophyte cov er age were measured as con trib uted en vi ron men tal pa ram e ters for the dis tri bu tion of cladoceran com mu ni ties across the lakes. Thirtytwo cladoceran spe cies were found in the seven lakes. The re corded spe cies have wide tol er ance spec tra, and are able to col o nize very dif fer ent kind of hab i tats. The most com mon and abun dant spe cies were Chydorus sphaericus, Alona rectangula and Bosmina longirostris. Lake area, lat i tude, macrophyte cov er age, pH, con duc tiv ity and hard ness were found to be the most de ter mi nant en vi ron men tal vari ables in the dis tri bu tion of cladoceran spe cies. This study revealed that al though the lakes show a clear sep a ra tion in en vi ron men tal pa ram e ters the com po si tion and dis tri bu tion of Cladoceran com mu ni ties dif fer only slightly across the in ves ti gated geo graph ical gra di ent.
Źródło:
Studia Quaternaria; 2012, 29; 45-52
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sexual reproduction of chydorids (Anomopoda, Chydoridae) as indicator of climate in recent sediments of Lake Aitajärvi, northern Finnish Lapland
Autorzy:
Sarmaja- Korjonen, Kaarina
Powiązania:
https://bibliotekanauki.pl/articles/2026959.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chydorid ephippia
Subfossil Cladocera
climate
length of open-water season
Finnish Lapland
Opis:
The pres ent work is a part of the de vel op ment of a method which uses the rela tive pro por tions of asexu ally and sexually re pro duc ing chy do rid fe males to re con struct the length of the open- water sea son. Sur face sedi ments (5 cm) of Lake Ai tajärvi, north ern Fin nish Lap land, were ex am ined for mod ern and re cent pro por tions of chy do rid cla do ceran ephip pia in sub arc tic cli mate near the pine limit. The to tal chy do rid ephip pium pro por tions (TCE) were stead ily 9.5–9.7% in the Ai tajärvi sedi ment but de clined to 8.4% in the up per most sam ple. The re sult was com pared with the sur face sedi ment TCE from four lakes in south ern Fin land where it var ied be tween 3–6%. It was also com pared with the TCE from two lakes in north ern most Fin nish Lap land above the treeline in very se vere cli mate, where it was 26–30%. These very high val ues sug gest that there might be a thresh old in cli mate con di tions be tween Ai tajärvi and the two north ern most lakes that al ters the re pro duc tion of chy do rids to wards an even more im por tant role of sex ual repro duc tion.
Źródło:
Studia Quaternaria; 2007, 24; 69-72
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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