Publications about Chesapeake Bay

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.

Healthy Chesapeake Waterways (Page 1)

Healthy Chesapeake Waterways

Tim Carruthers ·
1 May 2002

This science newsletter focuses on the role of the Integration and Application Network (IAN) in achieving healthy Chesapeake waterways. This is the first in a series of IAN newsletters on topical issues and is directed towards the scientific and technical audience. This newsletter identifies IAN's vision for Healthy Chesapeake Waterways and includes an overview of environmental problem solving, through transfer of data into information into knowledge and ultimately into problem solving.

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Science and Site 104: Long-term Options for Dredged Sediment Placement (Page 1)

Science and Site 104: Long-term Options for Dredged Sediment Placement

Baker JE, Boesch DF, Boicourt WC, Boynton WR, Chao SY, Cornwell JC, Fisher TR, Houde ED, Kennedy VS, Mason RP, Mihursky JA, Miller TJ, Sanford LP, Secor DH, Stevenson JC and Wright DA ·
15 September 1999

Scientists from the University of Maryland Center for Environmental Science have evaluated the scientific understanding and uncertainty related to five issues regarding the environmental effects of placement of dredged sediments at Site 104, at the head of the deep, natural channel of the Chesapeake Bay. This assessment was based on reviews of relevant studies and impact statements as well as on the scientists’ extensive knowledge and experience concerning the Chesapeake Bay ecosystem.

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Temperature, salinity and food effects on asexual reproduction and abundance of the scyphozoan Chrysaora quinquecirrha

Purcell JE, White JR, Nemazie DA, and Wright DA ·

Outbreaks of jellyfish are reported worldwide, yet the environmental factors that control the sizes of jellyfish populations are not well understood. The scyphomedusan Chrysaora quinquecirrha occurs in the mesohaline portion of Chesapeake Bay each summer. Population sizes of the medusae show dramatic annual variations that are correlated with salinity and temperature.

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Predation Mortality of Bay Anchovy Anchoa-Mitchilli Eggs and Larvae Due to Scyphomedusae and Ctenophores in Chesapeake Bay

Purcell JE, Nemazie DA, Dorsey SE, Houde ED, and Gamble JC ·

We measured predation on bay anchovy Anchoa mitchilli eggs and larvae by abundant scyphomedusae Chrysaora quinquecirrha and ctenophores Mnemiopsis leidyi from gut contents, digestion rates, and densities of predators and prey during 9 d in July 1991 at 4 stations in Chesapeake Bay, USA, These predation rates were compared to egg and larval mortality rates measured concurrently in ichthyoplankton surveys.

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Ammonium Excretion by Gelatinous Zooplankton and Their Contribution to the Ammonium Requirements of Microplankton in Chesapeake Bay

Nemazie DA, Purcell JE, and Glibert PM ·

Ammonium excretion rates of recently collected specimens of gelatinous zooplankton. the scyphomedusan Chrysaora quinquecirrha DeSor and the ctenophore Mnemiopsis leidyi A. Agassiz, were correlated with body mass and water temperature in measurements made from April to October 1989 and 1990. Rates ranged between 3.5 and 5.0 mug atoms NH4+-N (g dry wt)-1 h-1 for C. quinquecirrha and 3.0 to 4.9 mug atoms NH4-N (g dry wt) -1 h-1 for M. leidyi.

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Nitrogen Versus Phosphorus Limitation for Growth of an Estuarine Population of Eelgrass (Zostera marina L) (Page 1)

Nitrogen Versus Phosphorus Limitation for Growth of an Estuarine Population of Eelgrass (Zostera marina L)

Murray L, Dennison WC, and Kemp WM ·

The relative importance of nitrogen (N) and phosphorus (P) limitation for growth and biomass accumulation in an estuarine population of eelgrass (Zostera marina L.) was examined by in situ additions of nitrogen (+N), phosphorus (+P) and nitrogen plus phosphorus (+N+P) to sediments at low and high loading rates. Nitrogen treatments resulted in no significant increases in leaf tissue N levels and only a small increase in the N content of root plus rhizome tissues.

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Quantitative Feeding Ecology of the Hydromedusan Nemopsis-Bachei in Chesapeake Bay

Purcell JE and Nemazie DA ·

We determined feeding rates of the hydromedusan Nemopsis bachei L. Agassiz in the mesohaline region of Chesapeake Bay, USA during the spring of 1989 and 1990 from gut contents, digestion rates and abundances of medusae and zooplankton. The medusae consumed primarily copepodites of Acartia tonsa, selecting against naupliar stages.

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