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.

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 ·
1994

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 ·
1993

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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Culture studies on two morphological types of Caulerpa (Chlorophyta) from Perth, Western Australia, with a description of a new species (Page 1)

Culture studies on two morphological types of Caulerpa (Chlorophyta) from Perth, Western Australia, with a description of a new species

Carruthers TJB, Walder DI, and Huisman JM ·
1993

The phenotypic plasticity and performance of two growth-forms of Caulerpa racemosa (Forsskal) J. Agardh, one found in estuarine conditions, the other growing in a coastal reef environment was studied in laboratory culture. There was no change in the morphology of either growth-form when cultured through a range of salinity (10—40%o) and light (20—140 μEm-2s-1) conditions.

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Understanding the Eastern Caribbean and the Antilles (Page 1)

Understanding the Eastern Caribbean and the Antilles

Nelson Marshall ·
1 March 1992

In this book, the author takes the reader on a delightful natural history tour of the beautiful islands in the Eastern Caribbean Sea. A well traveled natural historian, Professor Marshall unveils a variety of interesting and well communicated vignettes about Caribbean natural history. This book should provide readers with an appreciation of the natural history wonders of the Caribbean region and allow them to become transformed into travelers with an eye for the world around them.

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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 ·
1992

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 ·
1992

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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Light Availability and Diurnal Growth of a Green Macroalga (Caulerpa-Cupressoides) and a Seagrass (Halophila-Decipiens) (Page 1)

Light Availability and Diurnal Growth of a Green Macroalga (Caulerpa-Cupressoides) and a Seagrass (Halophila-Decipiens)

Williams SL and Dennison WC ·
1990

The effects of daily light period on diurnal growth patterns of a green macroalga [Caulerpa cupressoides v. lycopodium f. elegans (J. Agardh) Weber-van Bosse] and a seagrass (Halophila decipiens Ostenfeld) were investigated in Salt River submarine canyon in the US Virgin Islands in summer 1984. The daily light period, in which quantum irradiance exceeded the light saturation point for photosynthesis of the macroalga and seagrass, was manipulated in situ using lamps and shades.

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Phosphorus-Limited Growth of the Tropical Seagrass Syringodium-Filiforme in Carbonate Sediments (Page 1)

Phosphorus-Limited Growth of the Tropical Seagrass Syringodium-Filiforme in Carbonate Sediments

Short FT, Dennison WC, and Capone DG ·
1990

Seagrasses, along with all other marine primary producers, are generally considered to be nitrogen limited. Now experimental enrichments of the tropical seagrass Syringodium filiforme Kütz. show that phosphorus, rather than nitrogen, can be the primary limiting nutrient in a marine carbonate environment. Phosphorus enrichment of carbonate sediments resulted in dramatic increases in seagrass growth, biomass, and tissue phosphorus composition.

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