Understanding Regional Change: A Comparison of Two Lake Districts

Carpenter, Stephen R.; Benson, Barbara J.; Biggs, Reinette; Chipman, Jonathan; Foley, Jonathan A.; Golding, S; Hammer, Roger B.; Hanson, Paul C.; Johnson, Pieter T. J.; Kamarainen, Amy; Kratz, Timothy K.; Lathrop, Richard C.; McMahon, Katherine D.; Provencher, Bill; Rusak, James A.; Solomon, Christopher T.; Stanley, Emily H.; Turner, Monica G.; Zanden, M. Jake Vander; Wu, Chin H.; Yuan, Hengliang

doi:10.1641/b570407

Cited by 139 publications

(106 citation statements)

References 44 publications

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“…The properties of aquatic ecosystems have recently been considered in the context of landscapes, where lakes in a geographic area are examined to identify common and long-term behaviour patterns for one or more variables (Carpenter et al, 2007;Das et al, 2009;Magnuson et al, 1990;Soranno et al, 1999). As a result, limnologists have increasingly considered lakes to be dynamic ecological units connected and organized across the landscape, rather than spatially independent entities Kratz et al, 1991;Webster et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

et al. 2010

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Temporal coherence (i.e., the degree of synchronicity of a given variable among ecological units within a predefined space) has been shown for several limnological features among temperate lakes, allowing predictions about the structure and function of ecosystems. However, there is little evidence of temporal coherence among tropical aquatic systems, where the climatic variability among seasons is less pronounced. Here, we used data from long-term monitoring of physical, chemical and biological variables to test the degree of temporal coherence among 18 tropical coastal lagoons. The water temperature and chlorophyll-a concentration had the highest and lowest temporal coherence among the lagoons, respectively, whereas the salinity and water colour had intermediate temporal coherence. The regional climactic factors were the main factors responsible for the coherence patterns in the water temperature and water colour, whereas the landscape position and morphometric characteristics explained much of the variation of the salinity and water colour among the lagoons. These results indicate that both local (lagoon morphometry) and regional (precipitation, air temperature) factors regulate the physical and chemical conditions of coastal lagoons by adjusting the terrestrial and marine subsidies at a landscape-scale. On the other hand, the chlorophyll-a concentration appears to be primarily regulated by specific local conditions resulting in a weak temporal coherence among the ecosystems. We concluded that temporal coherence in tropical ecosystems is possible, at least for some environmental features, and should be evaluated for other tropical ecosystems. Our results also reinforce that aquatic ecosystems should be studied more broadly to accomplish a full understanding of their structure and function.Keywords: synchrony, temporal coherence, local factors, regional factors, shallow lakes, coastal lagoons. Coerência temporal entre lagoas costeiras tropicais: uma busca por padrões e mecanismos ResumoA coerência temporal (i.e., o nível de sincronismo de uma dada variável ecológica entre unidades ecológicas) tem sido demonstrada para uma vasta gama de variáveis limnológicas em lagos de clima temperado, permitindo que predições sobre a estrutura e o funcionamento destes ecossistemas sejam realizadas. Entretanto, há pouca evidência da coerência temporal de variáveis limnológicas entre ecossistemas aquáticos tropicais, onde a variação climática é menos pronunciada entre as estações do ano. Neste estudo, utilizamos dados de longa duração do monitoramento de variáveis físicas, químicas e biológicas para testar a ocorrência de coerência temporal entre 18 lagoas costeiras tropicais. A temperatura da água e a concentração de clorofila-a apresentaram, respectivamente, a maior e a menor coerência temporal entre as lagoas, enquanto que a salinidade e a coloração da água apresentaram padrões intermediários. Fatores climáticos regionais foram os principais fatores responsáveis pelos padrões de coerência da temperatura e coloração d...

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Section: Introductionmentioning

confidence: 99%

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

et al. 2010

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“…Some individuals affect fish and wildlife populations by using roads to introduce (accidentally or purposefully) aquatic species (Carpenter et al 2007) and to exploit wildlife (Wilkie et al 2008).…”

Section: Len M Hunt Matthew Hupfmentioning

confidence: 99%

The effectiveness of road closures and deactivations at reducing traffic: A case of resource roads used for recreational activities in Ontario, Canada

Hunt

Hupf

2014

The Forestry Chronicle

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We investigated the effectiveness of different approaches at limiting motorized vehicle traffic on unpaved roads designed to support forestry operations (i.e., resource roads). The approaches (i.e., year-round closure, seasonal closure, deactivation, and deactivation and closure) were employed to provide non-road-based opportunities for people to pursue outdoor recreation and nature-based tourism activities by deterring hunters and others from using motorized vehicles to access areas beyond a road closure/deactivation. Using the case of weekend traffic on single-lane resource roads in northern Ontario, Canada during the gun portion of the moose (Alces alces) hunting season, we developed and investigated three general hypotheses. The first hypothesis that closure and/or deactivation approaches significantly reduce traffic on these resource roads was supported. In fact, we estimated that on average these approaches should reduce about 78% of traffic. No support existed for the second hypothesis that the effectiveness of these approaches depends on road quality. The third hypothesis was supported that differences exist in the effectiveness of the four road closure and/or deactivation approaches to reduce traffic on resource roads. A year-round closure was amongst the least while a seasonal road closure was amongst the most effective approach to reduce traffic on these roads.Keywords: resource management, road ecology, compliance résumé Nous avons étudié l' efficacité de différentes approches pour limiter la circulation de véhicules motorisés sur les routes non pavées conçues pour les opérations forestières (par ex., les chemins d'accès). Les approches (par ex., fermeture à l'année longue, fermeture saisonnière, mise hors service et mise hors service et fermeture) ont été utilisées pour offrir des possibilités de se déplacer sans utiliser de route aux personnes qui entreprennent des activités récréatives en plein air et d' écotourisme tout en incitant les chasseurs et autres utilisateurs à se déplacer sans véhicule moteur dans les zones se retrouvant après la section de route fermée ou mise hors service. Au moyen de l' exemple de la circulation lors de fins de semaine sur des chemins forestiers à une voie dans le nord de l'Ontario au Canada, au cours des jours de chasse au fusil de la période de chasse à l' orignal (Alces alces), nous avons élaboré et étudié trois hypothèses générales. La première hypothèse voulant que l'approche impliquant la fermeture accompagnée ou non de mise hors service réduise de façon significative la circulation sur ces chemins forestiers s'avère fondée. En effet, nous avons estimé qu' en moyenne ces approches devraient réduire la circulation de 78%. Nous n'avons trouvé aucun point appuyant la deuxième hypothèse voulant que l' efficacité de ces approches dépende de la qualité de la route. La troisième hypothèse s'appuyait sur le fait qu' on retrouve des différences au niveau de l' efficacité des quatre approches de fermeture ou de mise hors service pour réduire la circulation sur le...

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“…Water chemical composition is also affected on the long-term by direct human disturbance (e.g., eutrophication) and climate change (Rogora et al, 2003;Adrian et al, 2009;Lu et al, 2013). Lakes are good sentinels of diverse environmental changes due to their ability to quickly modify their chemical, physical and biological characteristics as a consequence of alterations in their surrounding landscape and atmosphere (Bertoni et al, 1998;Carpenter et al, 2007;Pham et al, 2008;Williamson et al, 2008;Adrian et al, 2009;Williamson et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Long-term trends of chemical and modelled photochemical parameters in four Alpine lakes

Minella

Leoni

Salmaso

et al. 2016

Science of The Total Environment

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Understanding Regional Change: A Comparison of Two Lake Districts

Cited by 139 publications

References 44 publications

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

The effectiveness of road closures and deactivations at reducing traffic: A case of resource roads used for recreational activities in Ontario, Canada

Long-term trends of chemical and modelled photochemical parameters in four Alpine lakes

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