Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Upper Newport Bay estuary, Orange County, California, US, was added to the Clean Water Act 303(d) list for nutrients, due in part to the excessive growth of macroalgae during certain seasons. In 1998, a Total Maximum Daily Load for nitrogen and phosphorus was adopted for San Diego Creek, the largest tributary to the estuary. As part of the implementation of the TMDL, the N and P water quality objectives were evaluated. Insufficient data were available to determine whether they were appropriate; therefore, mechanistic studies investigating the processes in UNB that control macroalgal biomass were needed. We 1) investigated the contribution of nutrients from estuarine sediments to macroalgal growth and tissue nutrient content; 2) determined if N or P is the nutrient most limiting to macroalgae; 3) measured rates of N and P uptake by Enteromorpha intestinalis and Ulva expansa, the dominant, green, bloomforming macroalgal species; and 4) investigated the effects of variation in the frequency and concentration of nutrient pulses on macroalgal growth and tissue nutrient content. Sediments were an important source of nutrients to macroalgae, particularly where water column nutrient availability was low. N was the nutrient most limiting growth of macroalgae from UNB and P was the next most limiting nutrient after N. Rates of nutrient uptake varied with external substrate concentration, initial tissue nutrient status, and phase of nutrient uptake. E. intestinalis grew most with daily additions of nutrients but also took up and stored nutrients from the episodic pulses to maintain growth in a low nutrient environment for up to 28 d. This work furthers our understanding of nutrient-macroalgal dynamics in a southern California estuary.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 01 January 2002

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more