INVERTEBRATE ASSEMBLAGES ASSOCIATED WITH LEAF LITTER IN THREE FLOODPLAIN WETLANDS OF THE PARANA RIVER

被引:14
作者
Poi de Neiff, Alicia [1 ]
Eugenia Galassi, Maria [1 ]
Celeste Franceschini, Maria [1 ]
机构
[1] Consejo Nacl Invest Cient & Tecn, CECOAL, Ctr Ecol Aplicada Litoral, RA-3400 Corrientes, Argentina
关键词
hydrologic connectivity; leaf decomposition; riparian wetlands; DECOMPOSITION; BREAKDOWN; COLONIZATION; STREAM; MACROINVERTEBRATES; TEMPERATE; CHACO;
D O I
10.1007/BF03173617
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We analyzed invertebrate abundance and richness associated with decomposing litter across three riverine wetlands with different inundation regimes located in the alluvial floodplain of the Parana River. Three replicate bags were incubated for different types of leaf litter that were dominant in each wetland for five sampling dates, yielding a total of 165 litterbags. The number of invertebrates per g of remaining leaf litter differed among wetlands and was affected by leaf litter type and incubation date within each wetland. In contrast to abundance, differences in invertebrate composition were more pronounced across wetlands than across leaf litter types within a wetland. Different species dominated in each of the three wetlands. When we compared the number of invertebrates per g remaining of a single litter type (Eichhornia crassipes) across the three wetlands, variability in density was explained by the NH4+ content of the water and dissolved oxygen concentration. Many invertebrates associated with litter may not be directly involved in shredding the material, and collectors dominated invertebrate assemblages at study sites. Although both litter quality and wetland condition affect the invertebrates colonizing leaf litter, our results suggest that spatial heterogeneity, linked to connectivity, plays an important role in determining invertebrate assemblages.
引用
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页码:896 / 906
页数:11
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