Year-Class Fluctuations of Vendace (<i>Coregonus albula</i>) in Lake Pyhäjärvi, Southwest Finland, during 1971–90

10.1007/s10750-012-1182-1Contact CEH NORA team at noraceh@ceh.ac.ukThe NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. form, nor will it be during the first three months after its submission to Hydrobiologia."Corresponding author: Erik Jeppesen (ej@dmu.dk)We dedicate this paper to the late Prof. Jürgen Benndorf, a true pioneer and mentor in lake and reservoir management oriented research, who inspired a number of us to initiate longterm comprehensive experimental ecological studies on lakes and reservoirs. AbstractFish play a key role in the trophic dynamics of lakes. With climate warming, complex changes in fish assemblage structure may be expected owing to direct effects of temperature and indirect effects operating through eutrophication, water level changes, stratification and salinisation. We reviewed published and new long-term (10-100 years) fish data series from 24 European lakes (area: 0.04-5648 km 2 ; mean depth: 1-177m; a north-south gradient from 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 4 Sweden to Spain). Along with an annual temperature increase of about 0.15-0.3 °C per decade profound changes have occurred in either fish assemblage composition, body size and/or age structure during recent decades and a shift towards higher dominance of eurythermal species.These shifts have occurred despite a reduction in nutrient loading in many of the lakes that should have benefited the larger-sized individuals and the fish species typically inhabiting cold-water, low-nutrient lakes. The cold-stenothermic Arctic charr has been particularly affected and its abundance has decreased in the majority of the lakes where its presence was recorded. The harvest of cool-stenothermal trout has decreased substantially in two southern lakes. Vendace, whitefish and smelt show a different response depending on lake depth and latitude. Perch has apparently been stimulated in the north, with stronger year classes in warm years, but its abundance has declined in the southern Lake Maggiore, Italy. Where introduced, roach seems to take advantage of the higher temperature after years of low population densities. Eurythermal species such as common bream, pike-perch and/or shad are apparently on the increase in several of the lakes. The response of fish to the warming has been surprisingly strong and fast in recent decades, making them ideal sentinels for detecting and documenting climate-induced modifications of freshwater ecosystems.

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“…(Helminen et al, 1993). For other years, year class size was estimated utilising the strong density dependence of first-summer growth of vendace.…”

Section: Lake Säkylän Pyhäjärvi Finlandmentioning

confidence: 99%

Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes

et al. 2012

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“…Helminen et al (1993) provide an excellent example for vendace in Finland. Asymmetrical competition between age classes results in strong biennial population oscillations in this heavily exploited species.…”

Section: Intercohort Density-dependent Mortalitymentioning

confidence: 99%

Stock and recruitment: generalizations about maximum reproductive rate, density dependence, and variability using meta-analytic approaches

Myers

2001

ICES Journal of Marine Science

219

187

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Myers, R. A. 2001. Stock and recruitment: generalizations about maximum reproductive rate, density dependence, and variability using meta-analytic approaches. -ICES Journal of Marine Science, 58: 937-951.I describe the development and application of meta-analytic techniques to understand population dynamics. These methods have been applied to a compilation of over 700 populations of fish, which includes multivariate time-series of egg production, population size, natural mortality, and anthropogenic mortality. The key requirements of this approach are to make all units comparable and to make all model parameters random variables that describe the variation among populations. Parameters are then estimated using hierarchical Bayesian or classical mixed models. This approach allows patterns to be determined that are not detected otherwise. For example, the maximum annual reproductive rate is relatively constant for all species examined: between 1 and 7 replacement spawners are produced per spawner per year at low population size. Using these approaches, I also show a 20-fold variation in carrying capacity per unit area for cod, and a decrease in carrying capacity with temperature. Recruitment variability generally increases at low population sizes, for species with higher fecundity, for populations at the edge of their range, and in regions with less oceanographic stability. The spatial scale of recruitment correlations for marine species is approximately 500 km, compared with less than 50 km for freshwater species; anadromous species fall between these two scales. Recruitment variability generally decreases with age for marine demersal fish, but often increases with age for some salmonids.2001 International Council for the Exploration of the Sea

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“…Several studies on density-dependent growth in coregonid populations have confirmed this general concept. These studies have compared whitefish growth rates among lakes with different whitefish densities (Bidgood 1973;Lehtonen and Niemelä 1998;Mayr 2001), compared growth rates before and after stock size reduction through intensive fishing (Amundsen 1988;Valkeajärvi 1992;Mills et al 1995), or monitored whitefish stock oscillations over longer time periods (Helminen et al 1993;Salonen et al 1998;Viljanen et al 2004). Most of the published studies on whitefish growth have, however, focussed either on lake trophic state or on population density.…”

Section: Introductionmentioning

confidence: 99%

The influence of eutrophication and population biomass on common whitefish (Coregonus lavaretus) growth — the Lake Constance example revisited

Thomas¹,

Eckmann²

2007

Can. J. Fish. Aquat. Sci.

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Accelerated growth of freshwater fish during anthropogenic eutrophication has been attributed almost exclusively to the increased nutrient content, while density-dependent effects have been largely neglected. We evaluated the relative importance of these factors by studying the growth of 43 consecutive year classes of common whitefish (Coregonus lavaretus) from Upper Lake Constance. This prealpine lake underwent eutrophication from the 1950s to 1970s, followed by reoligotrophication. Because whitefish are harvested with gill nets in a strongly size-selective way, we used back-calculated lengths of average fast-growing fish to compare growth among cohorts. Standing stock biomass was estimated based upon virtual year-class strengths. Multiple linear regression analysis revealed that growth of whitefish during their second year was most strongly related to standing stock biomass followed by PO 4 -P content during spring turnover and by calendar year, which was incorporated as a third independent variable (adjusted R 2 = 0.84). The negative correlation between whitefish growth rate and calendar year is interpreted as evidence of an evolutionary response to the highly size-selective fishery during at least four decades. We conclude that density-dependent effects on whitefish growth are more important than had been realized previously and that the impact of eutrophication on growth of whitefish needs to be reconsidered.Résumé : La croissance accélérée des poissons d'eau douce dans les conditions d'eutrophisation anthropique a été attribuée presque exclusivement à l'augmentation du contenu en nutriments; en revanche, les effets reliés à la densité ont été en grande partie négligés. Nous évaluons l'importance relative de ces facteurs dans une étude de la croissance de 43 classes d'âge consécutives de corégones lavarets (Coregonus lavaretus) du lac supérieur de Constance. Ce lac préalpin a subi une eutrophisation des années 1950 aux années 1970, suivie d'une ré-oligotrophisation. Parce que les corégones sont récoltés dans des filets maillants qui font une forte sélection en fonction de la taille, nous avons utilisé les longueurs obtenues par rétro-calcul de poissons moyens à croissance rapide pour comparer la croissance entre les cohortes. Nous avons estimé la biomasse du stock d'après les forces des classes d'âge virtuelles. Une analyse de ré-gression multiple linéaire montre que la croissance des corégones durant leur seconde année est surtout reliée à la biomasse du stock, puis au contenu de P-PO 4 durant le brassage du printemps et à l'année du calendrier qui a été incorporée à l'analyse comme troisième variable indépendante (R 2 ajusté = 0,84). Nous interprétons la corrélation négative qui existe entre la croissance des corégones et l'année du calendrier comme une indication de la réponse évolutive à la pêche très sélective au cours d'au moins de quatre décennies. Nous concluons que les effets reliés à la densité sur la croissance des corégones sont plus importants qu'on ne le croyait antérieurement et qu'...

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Year-Class Fluctuations of Vendace (Coregonus albula) in Lake Pyhäjärvi, Southwest Finland, during 1971–90

Cited by 44 publications

References 10 publications

Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes

Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes

Stock and recruitment: generalizations about maximum reproductive rate, density dependence, and variability using meta-analytic approaches

The influence of eutrophication and population biomass on common whitefish (Coregonus lavaretus) growth — the Lake Constance example revisited

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