We use autonomous gas measurements to examine the metabolic balance (photosynthesis minus respiration) of coastal Antarctic waters during the spring/summer growth season. Our observations capture the development of a massive phytoplankton bloom and reveal striking variability in pCO₂ and biological oxygen saturation (ΔO₂/Ar) resulting from large shifts in community metabolism...
Published January 2001. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
ICES – the International Council for the Exploration of the Sea – was founded more than a century ago out of
concern for overfishing. However, today’s global marine ecosystems are for the most part in a degraded state, many
alarmingly so. Why is the science used so little to make...
This study presents a methods evaluation and intercalibration of active fluorescence-based measurements of
the quantum yield (ϕ'ₚₛᵢᵢ) and absorption coefficient (aₚₛᵢᵢ) of photosystem II (PSII) photochemistry. Measurements
of ϕ'ₚₛᵢᵢ, aₚₛᵢᵢ, and irradiance (E) can be scaled to derive photosynthetic electron transport rates (Pₑ), the process
that fuels phytoplankton carbon fixation...
Purple nutsedge [Cyperus rotundas L.) has been recognized as one of the
most troublesome perennial weeds of agricultural lands in tropical and some
temperate regions. This research sought to determine the effects of timing of
herbicides, shading, and soil moisture on plant population growth and tuber
production of purple nutsedge...
Populations of Western Tragopans Tragopan
melanocephalus were studied at two areas (Machiara and
Salkhala) in the Neelum Valley of northeastern Pakistan.
A total of 130 sightings of birds was noted during the
breeding seasons in 1982 and 1983, but only 100 were re-located for vegetation analysis. More sightings of birds...