This newsletter is the product of the May 2005 Vital Signs workshop, with participants from each of the 11 National Parks within the NCRN. The National Park Service (NPS) is implementing a series of programs designed to provide a stronger scientific basis for management actions. The Inventory and Monitoring (I&M) program was initiated in 1990 to help fulfill this mission.

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Scientists with expertise in oyster biology, restoration, and management within the University of Maryland Center for Environmental Science met to discuss their diverse perspectives on bar cleaning and power dredging. They developed this consensus statement to offer the Center's best scientific advice to decision makers, managers, stakeholders and partners in oyster restoration.

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This document describes the rationale and methods for determining the summer ecological forecasts for dissolved oxygen, harmful algal blooms and submerged aquatic vegetation for 2005.

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This newsletter summarizes the main findings of an ecological forecast aimed at predicting changes in aquatic grass area within Chesapeake Bay for the current growing season. This forecast is part of a new initiative of the Chesapeake Bay Program to forecast a range of ecological conditions for the coming summer.

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This newsletter summarizes the main findings and methods of a new initiative to forecast ecological conditions of Chesapeake Bay for the coming summer. This year’s forecast focuses on three important elements of the Bay’s health—dissolved oxygen (DO) in the Bay’s mainstem, harmful algal blooms (HABs) in the Potomac River, and changes in submerged aquatic vegetation (SAV) distribution.

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The Indicator Redesign Taskforce was assembled to provide a vision for the Chesapeake Bay Program indicators and the manner in which they are communicated. In doing so, the Indicator Redesign Taskforce is initiating and steering the necessary changes through the Monitoring and Analysis Subcommittee. This document describes the goals, approach and methods used to redesign the ecological indicators and outlines the communication strategy used to convey these changes to the public.

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Environmental models are essential for simulating ecosystems that are either too large or too complex to isolate to conduct real world experiments. Models allow scientists to simulate changes in an ecosystem due to changes in population, land use, or pollution management.

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Resources and predation are both known to be important in structuring communities; however the strength of one factor may be affected by the intensity of the other. This study used a fully crossed factorial experiment in laboratory microcosms to examine the ability of a predator, Corethrella appendiculata (Grabham), and basal resources (leaf litter) to differentially affect two competing species of mosquito prey.

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1. The hypothesis that selective predation on larvae of the invasive Aedes albopictus (Skuse) could account for its stable coexistence with the native mosquito species and inferior competitor Ochlerotatus triseriatus (Say) in Florida treeholes and container systems was tested experimentally. 2. Functional responses of the two dipteran predators Toxorhynchites rutilus (Coquillett) and Corethrella appendiculata (Grabham) were evaluated separately for A. albopictus and O. triseriatus prey.

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Large blooms of the marine cyanobacterium Lyngbya majuscula in Moreton Bay, Australia (27 degrees 05'S, 153 degrees 08'E) have been re-occurring for several years. A bloom was studied in Deception Bay (Northern Moreton Bay) in detail over the period January-March 2000. In situ data loggers and field sampling characterised various environmental parameters before and during the L. majuscula bloom.

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