Publications by Bill Dennison

IAN is committed to producing practical, user-centered communications that foster a better understanding of science and enable readers to pursue new opportunities in research, education, and environmental problem-solving. Our publications synthesize scientific findings using effective science communication techniques.

Long-term Annual Aerial Surveys of Submersed Aquatic Vegetation (SAV) Support Science, Management, and Restoration (Page 1)

Long-term Annual Aerial Surveys of Submersed Aquatic Vegetation (SAV) Support Science, Management, and Restoration

Orth RJ, Dennison WC, Gurbisz C, Hannam M, Keisman J, Landry JB, Lefcheck JS, Moore KA, Murphy RR, Patrick CJ, Testa J, Weller DE, Wilcox DJ, and Batiuk RA ·
2019

Aerial surveys of coastal habitats can uniquely inform the science and management of shallow, coastal zones, and when repeated annually, they reveal changes that are otherwise difficult to assess from ground-based surveys. This paper reviews the utility of a long- term (1984–present) annual aerial monitoring program for submersed aquatic vegetation (SAV) in Chesapeake Bay, its tidal tributaries, and nearby Atlantic coastal bays, USA.

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2018 Maryland Coastal Bays Report Card (Page 1)

2018 Maryland Coastal Bays Report Card

Emily Nastase, Annie Carew, Bill Dennison, Heath Kelsey, Katie May Laumann ·
23 September 2019

The aim of this report card is to provide a transparent, timely, and geographically detailed assessment of 2018 Coastal Bays health. Coastal Bays health is defined as the progress of four water quality indicators (total nitrogen, total phosphorus, chlorophyll a, dissolved oxygen) and two biotic indicators (seagrass, hard clams) toward scientifically derived ecological thresholds or goals.

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Ecological Drought Across the United States (Page 1)

Ecological Drought Across the United States

Profound, widespread, and becoming more severe

Carter S, Donahue K, Myers B, Rubenstein M, Dennison WC, Lentz R, Blackband J, Malpeli K, Costanzo S, and Walsh B ·
1 August 2019

Across the United States, ecological drought is ubiquitous, profound, and has become more severe. This newsletter summarizes the findings of a three-year synthesis on the current status of drought research across the United States. The ecological drought synthesis project involved workshops at each of the eight regional Climate Adaptation Science Centers.

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2018 Chesapeake Bay & Watershed Report Card (Page 1)

2018 Chesapeake Bay & Watershed Report Card

Alexandra Fries, Caroline Donovan, Dylan Taillie, Heath Kelsey, Sky Swanson, Bill Dennison ·
21 May 2019

This report card provides a transparent, timely, and geographically detailed assessment of Chesapeake Bay. In 2018, the report card includes five water quality indicators and two biotic indicators. In 2018, the overall grade for Chesapeake Bay is a 46%, a C. This means the Bay is in moderate health. Despite the decrease in score from 2017, overall bay health is still significantly improving over time. Long term trends of each reporting region health and a fisheries index are also presented.

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Chesapeake Bay SAV Watchers - Guide to the Introductory Monitoring Program (Tier 1) (Page 1)

Chesapeake Bay SAV Watchers

Guide to the Introductory Monitoring Program (Tier 1)

Suzanne Webster, Bill Dennison ·
31 March 2019

This guide includes detailed instructions for volunteers who are using the Water Reporter platform to collect and submit data for the Chesapeake Bay SAV Watchers Introductory Monitoring Program.

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Conceptual Framework for Assessing Ecosystem Health (Page 1)

Conceptual Framework for Assessing Ecosystem Health

Harwell MA, Gentile JH, McKinney LD, Tunnell Jr JW, Dennison WC, Kelsey RH, Stanzel KM, Stunz GW, Withers K, and Tunnell J ·
2019

Over the past century, the environment of the Gulf of Mexico has been significantly altered and impaired by extensive human activities. A national commitment to restore the Gulf was finally initiated in response to the unprecedented Deepwater Horizon oil spill in 2010. Consequently, there is a critical need for an assessment framework and associated set of indicators that can characterize the health and sustainability of an ecosystem having the scale and complexity of the Gulf.

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Guanabara Bay ecosystem health report card: Science, management, and governance implications (Page 1)

Guanabara Bay ecosystem health report card: Science, management, and governance implications

Fries AS, Coimbra JP, Nemazie DA, Summers RM, Azevedo JPS, Filoso S, Newton M, Gelli G, Nunes de Oliveira RC, R. Pessoa MA, and Dennison WC ·
2019

Guanabara Bay, a natural tropical embayment in Southeast Brazil adjacent to Rio de Janeiro, is important to the Brazilian economy as it provides areas for shipping, industry, recreation, and tourism. But commercial and residential urban development in the watershed results in water quality degradation. In Guanabara Bay, strong water quality gradients as a function of inputs and tidal flushing were evident.

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