| Title | Paleolimnological evidence for increased sexual reproduction in chydorids (Chydoridae, Cladocera) under environmental stress |
| Abstract | To investigate the extent to which anthropogenic perturbations such as eutrophication and trace metal pollution (i.e.. environmental stress sensu dun, 1985) influence the reproductive modes of cladoceran populations, we analyzed the abundance of subfossils of the chydorids Alonella nana (Baird, 1850) and Alona affinis (Leydig. 1860) in sediment cores from three Finnish lakes. Reconstruction of lakes' pollutant history and the biological response of chydorids indicate that in two of the lakes the proportion of individuals reproducing sexually increased with environmental stressors. More specifically. A. nana responded to eutrophication in Lake Hamptrask with greater production of ephippia, while A. affinis responded to aluminum pollution or acidification in Lake Pieni Majaslampi. In contrast, the reference lake, Lake Iso Lehmalampi, showed no radical changes in sexual reproduction over the two-millennium long sediment record. We conclude that chydorids may use sexual reproduction as a strategy for overcoming unexpected environmental stresses. |
| Source | Journal of limnology (Testo stamp.) 70 (2), pp. 255–262 |
| Keywords | Aquatic environmentsCrustaceadiapausesubfossilseutrophication |
| Journal | Journal of limnology (Testo stamp.) |
| Editor | Istituto per lo Studio degli Ecosistemi., Verbania Pallanza, Italia |
| Year | 2011 |
| Type | Articolo in rivista |
| DOI | 10.3274/JL11-70-2-08 |
| Authors | Nevalainen, L (Nevalainen, Liisa)[ 1 ] ; Luoto, TP (Luoto, Tomi P.)[ 1,2 ] ; Levine, S (Levine, Suzanne)[ 3 ] ; Manca, M (Manca, Marina)[ 4 ] |
| Text | 203806 2011 10.3274/JL11 70 2 08 ISI Web of Science WOS 000294320400011 Aquatic environments Crustacea diapause subfossils eutrophication Paleolimnological evidence for increased sexual reproduction in chydorids Chydoridae, Cladocera under environmental stress Nevalainen, L Nevalainen, Liisa 1 ; Luoto, TP Luoto, Tomi P. 1,2 ; Levine, S Levine, Suzanne 3 ; Manca, M Manca, Marina 4 1 Austrian Acad Sci, Inst Limnol, A 5310 Mondsee, Austria 2 Univ Helsinki, Dept Geosci Geog, FIN 00014 Helsinki, Finland 3 Univ Vermont, Rubenstein Sch Environm Nat Resources, Burlington, VT 05405 USA 4 CNR Inst Ecosyst Study, I 28922 Verbania, Italy To investigate the extent to which anthropogenic perturbations such as eutrophication and trace metal pollution i.e.. environmental stress sensu dun, 1985 influence the reproductive modes of cladoceran populations, we analyzed the abundance of subfossils of the chydorids Alonella nana Baird, 1850 and Alona affinis Leydig. 1860 in sediment cores from three Finnish lakes. Reconstruction of lakes pollutant history and the biological response of chydorids indicate that in two of the lakes the proportion of individuals reproducing sexually increased with environmental stressors. More specifically. A. nana responded to eutrophication in Lake Hamptrask with greater production of ephippia, while A. affinis responded to aluminum pollution or acidification in Lake Pieni Majaslampi. In contrast, the reference lake, Lake Iso Lehmalampi, showed no radical changes in sexual reproduction over the two millennium long sediment record. We conclude that chydorids may use sexual reproduction as a strategy for overcoming unexpected environmental stresses. 70 ID_PUMA cnr.ise/2011 A0 032 Paleolimnological evidence for increased sexual reproduction in chydorids Paleolimnological_evidence_for_increased_sexual_reproduction_in_chydorids.pdf Articolo in rivista Istituto per lo Studio degli Ecosistemi. 1129 5767 Journal of limnology Testo stamp. Journal of limnology Testo stamp. J. limnol. Testo stamp. Journal of limnology. Testo stamp. marinamarcella.manca MANCA MARINA MARCELLA DG.RSTL.094.012 Evoluzione della biodiversita e valutazione della banca degli stadi duraturi di organismi acquatici di laghi remoti |
