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Effects of ultraviolet radiation andnutrients on periphyton growth in Castle Lake, California

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  • معلومة اضافية
    • بيانات النشر:
      Hosted by Utah State University Libraries
    • الموضوع:
      2001
    • Collection:
      Utah State University: DigitalCommons@USU
    • نبذة مختصرة :
      Rising levels of ultraviolet radiation (UVR) striking the Earth's surface have led to numerous studies assessing its inhibitory effects on phytoplankton and periphyton in aquatic systems. Mineral nutrients such as nitrogen (N) and phosphorus (P) have been shown to increase aspects of algal metabolism and compensate for UVR inhibition. An in situ substratum enrichment technique and UV shielding was used to assess the effects of nutrient additions on periphyton exposed to different levels of UVR in Castle Lake, California during July-August, 1997. UV shielding had no effect on total periphyton biomass, but caused shifts in species composition. The dominant periphyton species, Anabaena circinalis RAB., demonstrated sensitivity to ambient levels of UV radiation possibly due to UV inhibition of N2 -fixation. Total diatom biovolume decreased when shielded from UVR. Phosphorus additions continually elicited an increase in periphyton biovolume at all levels of analysis. These results suggest an interaction between nutrient status/availability and UV sensitivity.
    • Relation:
      https://digitalcommons.usu.edu/wats_facpub/219
    • الرقم المعرف:
      10.1002/1522-2632(200104)86:2<147::AID-IROH147>3.0.CO;2-Y
    • الدخول الالكتروني :
      https://digitalcommons.usu.edu/wats_facpub/219
      https://doi.org/10.1002/1522-2632(200104)86:2<147::AID-IROH147>3.0.CO;2-Y
    • Rights:
      Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu.
    • الرقم المعرف:
      edsbas.5566F62A