- 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