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.

In situ seagrass photosynthesis measured using a submersible, pulse-amplitude modulated fluorometer (Page 1)

In situ seagrass photosynthesis measured using a submersible, pulse-amplitude modulated fluorometer

Ralph PJ, Gademann R, and Dennison WC ·
1998

Assessments of photosynthetic activity in marine plants can now be made in situ using a newly developed, submersible, pulse-amplitude modulated (PAM) fluorometer: Diving-PAM. PAM fluorometry provides a measure of chlorophyll a fluorescence using rapid-light curves in which the electron-transport rate can be determined for plants exposed to ambient light conditions. This technique was used to compare the photosynthetic responses of seagrasses near Rottnest Island, Western Australia.

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Photosynthetic capacity in coral reef systems: Investigations into ecological applications for the underwater PAM fluorometer (Page 1)

Photosynthetic capacity in coral reef systems: Investigations into ecological applications for the underwater PAM fluorometer

Jones AB and Dennison WC ·
1998

A submersible pulse amplitude modulated (PAM) fluorometer was used to determine the effects of desiccation, ultraviolet radiation, changes in solar radiation and nutrient availability on the photosynthetic apparatus of a variety of marine plants (zooxanthellae, benthic microalgae and macroalgae) at Heron Island, Great Barrier Reef, Australia. The PAM measures photosynthesis as irradiance-dependent photosystem II electron transport.

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The crew member

The crew member's guide to the health of our waterways

Bill Dennison ·
1 January 1998

This book was the first in a series of publications in support of the Healthy Waterways campaign in Southeast Queensland, Australia. It provides a broad overview of Moreton Bay and its major tributaries, includes the first ecosystem report card for the region, and features 'catchment comments', personalized reflections from various community members and elected officials.

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Chemical composition and deposition of rain in the central Amazon, Brazil

Williams MR, Fisher TR, and Melack JM ·
1997

Major solute concentrations in wet deposition were measured for 115 individual events From October 1988 to June 1990 at Lake Calado, Amazonas, Brazil. A continuous record from July 1989 through June 1990 included 210 events that ranged in size from 0.2 to 85 mm (annual total, 2754 mm). The 95 events chemically analyzed during this period (45% of the total) were evenly distributed over all storm sizes.

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Growth and physiological responses of three seagrass species to elevated sediment nutrients in Moreton Bay, Australia (Page 1)

Growth and physiological responses of three seagrass species to elevated sediment nutrients in Moreton Bay, Australia

Udy JW and Dennison WC ·
1997

Seagrasses, marine angiosperms with high rates of primary productivity, are often limited by the supply of nutrients, particularly nitrogen (N) and phosphorus (P). We investigated growth and physiological responses of three seagrass species (Halodule uninervis (Forsk.), Zostera capricorni Aschers and Cymodocea serrulata (r.Br.) Aschers) to elevated sediment N (100X control) and/or P (10x control) in adjacent monospecific beds over a 3 month period from spring to early summer.

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