Data/hora: 31/05/2024 13:02:42

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	19/09/2008	
Data da última atualização: 	19/09/2008	
Autoria: 	HASSALL, M.; WARD, N.	
Título: 	Effects of climate change on faunal stimulation of CO2 emissions from soils.	
Ano de publicação: 	2008	
Fonte/Imprenta: 	In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.	
Idioma: 	Inglês	
Conteúdo: 	Ten times as much CO2 is currently emitted from the world?s soils as from all anthropogenic
sources combined. It follows that a 1% change in CO2 output from soils would have a greater
effect on atmospheric concentrations than the all the changes proposed in the Kyoto protocol
combined together. The potential for positive feedback resulting from increased microbial
metabolism in the soil resulting from climate change is very high but changes in soil metabolism
are also the least well understood part of how the whole global C cycle will respond to the effects
of climate change. What is known, as a result of decades of Soil Zoology, is that microbial
activity is strongly regulated by soil animals (Hassall et al. 2006), partly because of the ?Sleeping
Beauty paradox? (Lavelle et al 1995).
If the faunal regulators are affected differently to the microbes by climate change then predictions
from current models of the global carbon cycle are likely to be erroneous. The life cycles, metabolic
pathways, ecology and physiology of animals are so different to those of microbes they are very
unlikely to respond in the same way, particularly to future changes in precipitation, which in
many regions is predicted to involve both changes in both intensity and periodicity.
Soil animals will respond to these changes by alterations in the trade-off between times spent
feeding and sheltering, the degree to which they aggregate, their life histories and population
processes. Particularly good arthropod macro-decomposers for investigating these responses
are the terrestrial isopods for which all of these attributes have been thoroughly studied under
current climate conditions.
In this paper we report results of testing the hypotheses that a) intensity and b) periodicity of
rainfall and c) differences in relative humidity will affect feeding, sheltering and aggregating
behaviour, life history traits, growth and survivorship rates of terrestrial isopods. We further
hypothesise that different species will respond differently to experimental simulations of climate
change due to macro-evolutionary differences between species, particularly their different
physiological, morphological and behavioural adaptations to desiccation stress.. We go on to
test the hypothesis that different ecotypes of one species, from different parts of its geographical
range with different regional climates, will respond differently to alterations in patterns of
precipitation. Results from this experiment will help to answer the question of whether organisms
are likely to respond differently to climate change in different parts of their range as a result of
micro-evolutionary adaptations to different local climates
Finally we report on how responses of this group of soil animals to experimentally manipulated
micro-climates affect the extent to which they stimulate microbial metabolism, and subsequently
soil CO2 emissions.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Florestas (CNPF)	
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