Predicting stream temperatures: geostatistical model comparison using alternative distance metrics

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Abstract:

The Beaverkill Watershed in the Catskill Mountains of New York, U.S.A., shows evidence of high summer stream temperatures throughout critical trout habitat. Because habitat quality, as characterized by stream temperature, dramatically influences trout communities, it is important for biologists to identify and map these characteristics and to monitor how they change over time. Stream temperatures were recorded over time throughout the Beaverkill Watershed and were used to identify thermal refugia and areas of thermal stress. Seventy-two temperature loggers were placed throughout the watershed during the summer of 2000. Three geostatistical metrics for predicting temperature across the watershed were constructed and evaluated. The first metric utilized the shortest path between temperature loggers without using stream network information. A second metric used distances calculated along the stream network in both upstream and downstream directions. Our final metric was a modified network system in which the distances were weighted by stream order. Each metric was found to provide predictive capability, with added complexity improving the accuracy of represented stream temperatures.

Dans le système hydrographique de Beaverkill dans les monts Catskill du New York, E.-U., il y a des indices de températures élevées en été dans tout l'habitat critique de la truite. Parce que la qualité de l'habitat, telle que définie par la température de l'eau, influence fortement les communautés de truites, il est important que les biologistes identifient et cartographient ces températures et suivent leur évolution dans le temps. La température a été enregistrée dans tout le réseau hydrographique de Beaverkill à l'aide de 72 thermomètres enregistreurs à l'été 2000, ce qui a permis d'identifier les refuges et les points de stress thermique. Trois métriques géostatistiques ont été mises au point et évaluées pour prédire la température dans l'ensemble du réseau. La première métrique est la distance minimale entre deux enregistreurs sans tenir compte de renseignements provenant du réseau hydrographique. La seconde métrique utilise les distances calculées le long du réseau, tant vers l'amont que vers l'aval. La dernière métrique est un système de réseau modifié dans lequel les distances sont pondérées en fonction de l'ordre du cours d'eau. Chaque métrique possède un pouvoir de prédiction particulier et la complexité croissante des métriques améliore la justesse de leurs représentations des températures des cours d'eau.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 1, 2003

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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