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Microzooplankton grazing constrains pathways of carbon export in the subarctic North PacificNARA Subscribed
To identify the effect of microzooplankton grazing on phytoplankton abundance and size structure, we quantified phytoplankton growth and herbivorous grazing rates throughout the euphotic zone and across a light gradient on the North Pacific EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) cruise near Ocean Station Papa. During 30 days of continuous, Lagrangian observation in August and September of 2018, depth integ...
Ultraviolet B radiation (UVBR) damages the DNA of exposed cells, causing dimers to form between adjacent pyrimidine nucleotides. These dimers block DNA replication, causing mutations and apoptosis. Most organisms utilize biochemical or biophysical DNA repair strategies to restore DNA structure; however, as with most biological reactions, these processes are likely to be thermally sensitive. Tadpoles exposed to elevated UVBR at...
Post‐release survival of recreationally caught snapper, Pagrus auratus , in Port Phillip Bay, south‐eastern AustraliaNARA Subscribed
Snapper, Pagrus auratus (Forester), is an important recreational species in marine waters of Victoria, Australia. This study estimated survival for compulsorily released undersized P. auratus by holding fish in cages and tanks for 3 days. In all, 620 P. auratus caught by angling were assessed for post‐release survival and 200 additional fish were used as controls. The survival rate was greater for shallow‐hooked (97%) than dee...
An experiment demonstrated that post‐mortem shrinkage in fork length of juvenile pink snapper Pagrus auratus (179–262 mm) was the same in fish in which rigor mortis was surgically inhibited, as in intact fish, and averaged 5·5 ± 0·2 mm (mean ± s.e ., range 2–9 mm) after 168 h.
Post mortem shrinkage of four species of temperate and tropical marine fishes, without freezing or preservationNARA Subscribed
The present study indicated significant post mortem decreases in length for four Australian teleost species from temperate to tropical habitats: black bream Acanthopagrus butcheri , King George whiting Sillaginodes punctata , summer whiting Sillago ciliata and redthroat emperor Lethrinus miniatus . Shrinkage averaged 5·0 mm after 24 h (range 0–10 mm) for A. butcheri , 4 mm (0–8 mm) for S. punctata , 2·2 mm (0·7–3·7 mm) for S....
A thirty percent increase in UV‐B has no impact on photosynthesis in well‐watered and droughted pea plants in the fieldNARA Subscribed
It has been suggested that field experiments which increase UV‐B irradiation by a fixed amount irrespective of ambient light conditions (‘square‐wave’), may overestimate the response of photosynthesis to UV‐B irradiation. In this study, pea ( Pisum sativum L.) plants were grown in the field and subjected to a modulated 30% increase in ambient UK summer UV‐B radiation (weighted with an erythemal action spectrum) and a mild drou...
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