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1. Acclimation of C3 photosynthesis to elevated CO2: hypotheses and experimental evidence

Creator:
Reining, E.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
Acclimation of the photosynthesis of C3 plants to elevated atmospheric CO2 concentrations is ffequently observed. Some hypotheses ffequently proposed to explain this phenomenon are: (7) stomatal closure; (2) inhibition of photosynthesis by starch accumulation, and (5) reduced activity or concentration of ribulose-1,5- bisphosphate carboxylase/oxygenase. These hypotheses are compared with experimental evidence ffom the literature.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. The distribution and abundance of the nematode Anguillicola australiensis in eels Anguilla reinhardtii in Queensland, Australia

Creator:
Kennedy, C.R.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Anguillicola australiensis, Anguilla reinhardtii, ecology, distribution, population biology, transmission, pathology, and Australia
Language:
English
Description:
Anguillicola australiensis (Johnston et Mawson, 1940) is widespread and common in Anguilla reinhardtii Steidachner in rivers and dams of eastern Queensland, Australia, having been found in nine out of ten localities. Overall prevalence was 50% and maximum local prevalence reached 77.7%. The parasite never attained high levels of abundance and maximum adult abundance never exceeded 3.22 or intensity 10. Adults were overdispersed throughout the eel populations and abundance was unrelated to eel or swimbladder size. The greater part of the adult population was composed of immature parasites. The occurrence of larvae in the swimbladder wall was erratic and unrelated to the size of the adult population. Larvae were never abundant and the great majority were damaged by a host response. It appears that parasites either pass through the swimbladder wall rapidly and moult to adults or if delayed are destroyed. There was no indication that a paratenic host was involved in the life cycle. There was no evidence that adult parasites had any local pathogenic effects on their hosts. The population biology of Anguillicola australiensis in its natural host Anguilla reinhardtii appears to be far more similar to those of other Pacific species of Anguillicola in Anguilla japonica in China and Japan than to A. crassus in Anguilla anguilla in Europe or Japan. This latter host-parasite combination appears to be the exception not the rule. It is suggested that the lack of pathogenicity of A. australiensis may reflect a long period of host-parasite co-evolution and/or lower transmission rates resulting in lower parasite population densities.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public