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Walleye recruitment success is less resilient to warming water temperatures in lakes with abundant largemouth bass populations
- Source :
- Canadian Journal of Fisheries and Aquatic Sciences. January, 2018, Vol. 75 Issue 1, p106, 10 p.
- Publication Year :
- 2018
-
Abstract
- Lakes respond heterogeneously to climate, with implications for fisheries management. We analyzed walleye (Sander vitreus) recruitment to age-0 in 359 lakes in Wisconsin, USA, to (i) quantify the relationship between annual water temperature degree days (DD) and walleye recruitment success and (ii) identify the influence of lake characteristics--area, conductivity, largemouth bass (Micropterus salmoides) catch rates, and mean DD--on this relationship. The relationship between walleye recruitment and annual DD varied among lakes and was not distinguishable from zero overall (posterior mean = -0.11, 90% CI = -0.34,0.15). DD effects on recruitment were negative in 198 lakes (55%) and positive in 161(45%). The effect of annual DD was most negative in lakes with high largemouth bass densities, and, on average, the probability of recruitment was highest in large lakes with low largemouth bass densities. Conductivity and mean DD influenced neither recruitment nor the effect of annual DD. Walleye recruitment was most resilient to warming in lakes with few largemouth bass, suggesting that the effects of climate change depend on lake-specific food-web and habitat contexts. Les lacs ne reagissent pas au climat de maniere uniforme, ce qui a des consequences sur la gestion des peches. Nous avons analyse le recrutement de dores jaunes (Sander vitreus) de moins de 1 an dans 359 lacs du Wisconsin (Etats-Unis) pour (i) quantifier la relation entre les degres-jours (DJ) annuels de temperature de l'eau et le succes du recrutement de dores jaunes et (ii) cerner l'influence des caracteristiques du lac--superficie, conductivite, taux de prise d'achigans a grande bouche (Micropterus salmoides) et DJ moyens--sur cette relation. La relation entre le recrutement de dores jaunes et les DJ annuels varie selon le lac et, en general, s'assimile a zero (moyenne posterieure = -0,11, IC 90 % = -0,34, 0,15). Les effets des DJ sur le recrutement etaient negatifs dans 198 lacs (55 %) et positifs dans 161 lacs (45 %). L'effet des DJ annuels etait le plus negatif dans les lacs a forte densite d'achigans a grande bouche et, en moyenne, la probabilite de recrutement etait la plus elevee dans les lacs a faible densite d'achigans a grande bouche. La conductivite et les DJ moyens n'exerqaient pas d'influence sur le recrutement ni sur l'effet des DJ annuels. Le recrutement de dores jaunes presentait la plus forte resilience au rechauffement dans les lacs avec peu d'achigans a grande bouche, ce qui semble indiquer que les effets des changements climatiques dependent des contextes trophiques et d'habitats propres au lac. [Traduit par la Redaction]<br />Introduction Understanding how lakes respond to natural and anthropogenic environmental change is critical to the ecological and economic management of lacustrine resources. (Woodward et al. 2010; Carpenter et al. 2011). [...]
Details
- Language :
- English
- ISSN :
- 0706652X
- Volume :
- 75
- Issue :
- 1
- Database :
- Gale General OneFile
- Journal :
- Canadian Journal of Fisheries and Aquatic Sciences
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.521592546
- Full Text :
- https://doi.org/10.1139/cjfas-2016-0249