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Variation in reciprocal subsidies between lakes and land: perspectives from the mountains of California1.
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- Author(s): Piovia-Scott, Jonah; Sadro, Steven; Knapp, Roland A.; Sickman, James; Pope, Karen L.; Chandra, Sudeep
- Source:
Canadian Journal of Fisheries & Aquatic Sciences; 2016, Vol. 73 Issue 11, p1691-1701, 11p- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: Lakes are connected to surrounding terrestrial habitats by reciprocal flows of energy and nutrients. We synthesize data from California's mountain lake catchments to investigate how these reciprocal subsidies change along an elevational gradient and with the introduction of a top aquatic predator. At lower elevations, well-developed terrestrial vegetation provides relatively large inputs of organic material to lakes, whereas at higher elevations, the paucity of terrestrial vegetation provides minimal organic input but allows for higher inputs of inorganic nitrogen. There are also pronounced elevational patterns in amphibians and aquatic insects, which represent important vectors for resource flows from lakes back to land. The introduction of trout can reduce this lake-to-land resource transfer, as trout consume amphibians and aquatic insects. We propose a conceptual model in which within-lake processes influence terrestrial consumers at higher elevations, while terrestrial inputs govern within-lake processes at lower elevations. This model contributes to a more general understanding of the connections between aquatic and terrestrial habitats in complex landscapes. [ABSTRACT FROM AUTHOR]
- Abstract: Les lacs sont reliés aux habitats terrestres qui les entourent par des flux réciproques d'énergie et de nutriments. Nous mettons en rapport des données tirées de bassins versants de lacs de montagne en Californie pour étudier les variations de ces apports réciproques le long d'un gradient altitudinal et après l'introduction d'un prédateur aquatique de niveau trophique supérieur. À basse altitude, une végétation terrestre bien développée fournit de relativement grands apports de matière organique aux lacs, alors qu'à plus haute altitude, la rareté de la végétation terrestre fournit peu d'apports organiques, mais permet des apports d'azote inorganique plus importants. Des variations altitudinales marquées sont également observées chez les amphibiens et les insectes aquatiques, qui représentent d'importants vecteurs pour les flux de ressources des lacs vers la terre. L'introduction de truites peut réduire ce transfert de ressources des lacs vers la terre, puisque les truites consomment des amphibiens et des insectes aquatiques. Nous proposons un modèle conceptuel dans lequel les processus internes des lacs influencent les consommateurs terrestres à plus haute altitude, alors que les apports terrestres régissent les processus internes des lacs de plus basse altitude. Ce modèle participe à une compréhension plus générale des liens entre les habitats aquatiques et terrestres dans des paysages complexes. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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