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Registro Completo
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
08/10/2008 |
Data da última atualização: |
08/10/2008 |
Autoria: |
RAUB, F. |
Título: |
What can soil arthropods indicate at different taxonomic levels in tropical agro-ecosystems? |
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: |
We compared the activity based density of arthropods (pitfall fauna) of Amazonian agroforestry
systems (3 poly- and 2 monoculture systems) using a nearby natural forest as reference. At least
16 replicates of each system were studied, resulting in a total of 128 plots sampled. Arthropods
were identified on the taxonomic level order and the spiders subsequently to the level family.
We were at first hand interested in the community composition of arthropods in agroecosystems
and at second hand in the indicatory value of the pitfall arthropod fauna for the ecological status
of a system. All agro-ecosystems differed significantly from the old growth forest in arthropod
activity density and community structure/diversity even at order level. The natural forest showed
the highest diversity values using Shannon-Weaver and Simpson indices for comparison. It was
also possible to clearly separate the two monocultures from the polycultures and from each
other. The highest overall abundance could be found in the rubber tree monoculture. A t-test
comparison of the Shannon-Weaver indices (after Magurran 1998) and comparisons of the
dominance identity approved these clear differences in the diversity of the investigated systems.
The different types of polycultures could not be differentiated on this taxonomical level.
The activity based density of spiders separated also poly- and monocultures and the monocultures
from the natural forest. These results demonstrate the sensible reaction of spiders to the variation
of habitat parameters along with different forms of land use strategies. The community
composition at family level did, contrasting the order level, not show the highest diversity values
in the primary forest but in the Guaraná monoculture where also the highest activity based density
was found. The polycultures still formed one cluster comparing the dominance identity even
though the similarity decreased. A relatively high similarity of the diversity indices of the different
systems is due to the fact that using the family level a reaction of different species cannot be
seen because some species of a family could decrease others increase keeping the overall
abundance of the family itself the same level.
We still expect a lower taxonomic level to better differentiate between the polycultures, but already
at family level we could identify certain spider taxa that seem to have a potential to characterize
different tropical (agro-) ecosystems: e.g. Oonopids, Ochyroceratids, Lycosids and
mygalomorphs. Our results highlight that it should be even at low taxonomic levels possible to
assess the ecological status of agro-ecosystems and the biodiversity value of anthropogenically
influenced tropical sites using a fast method and therewith contribute to an important task in
tropical ecology (Lavelle et al. 1994, Biaggini et al. 2007).
Magurran AE (1988): Ecological diversity and its measurement. Sydney,179 S.
Lavelle P et al: Soil fauna and sustainable land use in the humid tropics. In: Greenland DJ,
Szabolcs I (eds) Soil resilience and sustainable land use CAB International, Wallingford, S.291-
308
Biaggini M et al (2007); The taxonomic level order as a possible tool for rapid assessment of
Arthropod diversity in agricultural landscapes. Agriculture, Ecosystem and Environment 122:183-
191 MenosWe compared the activity based density of arthropods (pitfall fauna) of Amazonian agroforestry
systems (3 poly- and 2 monoculture systems) using a nearby natural forest as reference. At least
16 replicates of each system were studied, resulting in a total of 128 plots sampled. Arthropods
were identified on the taxonomic level order and the spiders subsequently to the level family.
We were at first hand interested in the community composition of arthropods in agroecosystems
and at second hand in the indicatory value of the pitfall arthropod fauna for the ecological status
of a system. All agro-ecosystems differed significantly from the old growth forest in arthropod
activity density and community structure/diversity even at order level. The natural forest showed
the highest diversity values using Shannon-Weaver and Simpson indices for comparison. It was
also possible to clearly separate the two monocultures from the polycultures and from each
other. The highest overall abundance could be found in the rubber tree monoculture. A t-test
comparison of the Shannon-Weaver indices (after Magurran 1998) and comparisons of the
dominance identity approved these clear differences in the diversity of the investigated systems.
The different types of polycultures could not be differentiated on this taxonomical level.
The activity based density of spiders separated also poly- and monocultures and the monocultures
from the natural forest. These results demonstrate the sensible reaction of sp... Mostrar Tudo |
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LEADER 03960naa a2200121 a 4500 001 1315098 005 2008-10-08 008 2008 bl uuuu u00u1 u #d 100 1 $aRAUB, F. 245 $aWhat can soil arthropods indicate at different taxonomic levels in tropical agro-ecosystems? 260 $c2008 520 $aWe compared the activity based density of arthropods (pitfall fauna) of Amazonian agroforestry systems (3 poly- and 2 monoculture systems) using a nearby natural forest as reference. At least 16 replicates of each system were studied, resulting in a total of 128 plots sampled. Arthropods were identified on the taxonomic level order and the spiders subsequently to the level family. We were at first hand interested in the community composition of arthropods in agroecosystems and at second hand in the indicatory value of the pitfall arthropod fauna for the ecological status of a system. All agro-ecosystems differed significantly from the old growth forest in arthropod activity density and community structure/diversity even at order level. The natural forest showed the highest diversity values using Shannon-Weaver and Simpson indices for comparison. It was also possible to clearly separate the two monocultures from the polycultures and from each other. The highest overall abundance could be found in the rubber tree monoculture. A t-test comparison of the Shannon-Weaver indices (after Magurran 1998) and comparisons of the dominance identity approved these clear differences in the diversity of the investigated systems. The different types of polycultures could not be differentiated on this taxonomical level. The activity based density of spiders separated also poly- and monocultures and the monocultures from the natural forest. These results demonstrate the sensible reaction of spiders to the variation of habitat parameters along with different forms of land use strategies. The community composition at family level did, contrasting the order level, not show the highest diversity values in the primary forest but in the Guaraná monoculture where also the highest activity based density was found. The polycultures still formed one cluster comparing the dominance identity even though the similarity decreased. A relatively high similarity of the diversity indices of the different systems is due to the fact that using the family level a reaction of different species cannot be seen because some species of a family could decrease others increase keeping the overall abundance of the family itself the same level. We still expect a lower taxonomic level to better differentiate between the polycultures, but already at family level we could identify certain spider taxa that seem to have a potential to characterize different tropical (agro-) ecosystems: e.g. Oonopids, Ochyroceratids, Lycosids and mygalomorphs. Our results highlight that it should be even at low taxonomic levels possible to assess the ecological status of agro-ecosystems and the biodiversity value of anthropogenically influenced tropical sites using a fast method and therewith contribute to an important task in tropical ecology (Lavelle et al. 1994, Biaggini et al. 2007). Magurran AE (1988): Ecological diversity and its measurement. Sydney,179 S. Lavelle P et al: Soil fauna and sustainable land use in the humid tropics. In: Greenland DJ, Szabolcs I (eds) Soil resilience and sustainable land use CAB International, Wallingford, S.291- 308 Biaggini M et al (2007); The taxonomic level order as a possible tool for rapid assessment of Arthropod diversity in agricultural landscapes. Agriculture, Ecosystem and Environment 122:183- 191 773 $tIn: 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.
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