A1 Journal article (refereed)
Occurrence of Two-Year Cyclicity, “Saw-Blade Fluctuation”, in Vendace Populations in Finland (2021)

Marjomäki, T. J., Auvinen, H., Helminen, H., Huusko, A., Huuskonen, H., Hyvärinen, P., Jurvelius, J., Sarvala, J., Valkeajärvi, P., Viljanen, M., & Karjalainen, J. (2021). Occurrence of Two-Year Cyclicity, “Saw-Blade Fluctuation”, in Vendace Populations in Finland. Annales Zoologici Fennici, 58(4-6), 215-229. https://doi.org/10.5735/086.058.0408

JYU authors or editors

Publication details

All authors or editors: Marjomäki, Timo J.; Auvinen, Heikki; Helminen, Harri; Huusko, Ari; Huuskonen, Hannu; Hyvärinen, Pekka; Jurvelius, Juha; Sarvala, Jouko; Valkeajärvi, Pentti; Viljanen, Markku; et al.

Journal or series: Annales Zoologici Fennici

ISSN: 0003-455X

eISSN: 1797-2450

Publication year: 2021

Publication date: 06/09/2021

Volume: 58

Issue number: 4-6

Pages range: 215–229

Publisher: Finnish Zoological and Botanical Publishing Board

Publication country: Finland

Publication language: English

DOI: https://doi.org/10.5735/086.058.0408

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/78075

Publication is parallel published: https://research.utu.fi/converis/portal/detail/Publication/67224653?lang=fi_FI

Web address where publication is available: http://www.annzool.net/PDF/anz58-free/anz58-141-153-OA.pdf


The tendency towards two-year cyclicity is considered typical of many Fennoscandian vendace populations, especially in fluctuation of recruitment, based on time series of individual lakes. We used two robust indicators to identify and quantify two-year cycles in vendace population proxy time series at different life-stages — spawning stock biomass (SB), density of newly hatched larvae (LD) and recruitment (REC) — from 22 Finnish lakes. Then we applied Fisher’s meta-analytical test to assess the adequacy of the evidence to support the hypothesis that vendace population dynam-ics include two-year cyclicity. The results supported this hypothesis for RECbut not for SB or LD. Yet, the indicators and test are conservative and time-series of SB and LD are shorter than those for REC. The appearance of cycles in REC is associated with high post-recruitment mortality, consequently practically only one spawning per cohort. Cycles may be typical for the recovery period from low abundance period also. Still, some populations with moderate post-REC mortality and non-cyclic SB abundance exhibited cycles in REC. Such dynamics presuppose the existence of more complex regulation based on the interaction of different life stages.

Keywords: fish populations; population dynamics; population dynamics; vendace

Contributing organizations

Ministry reporting: Yes

Preliminary JUFO rating: 1

Last updated on 2022-17-06 at 10:38