Explaining dissimilarities in macroinvertebrate assemblages among stream sites using environmental variables

被引:21
|
作者
Melo, Adriano S. [1 ]
机构
[1] Univ Fed Rio Grande do Sul, Dept Ecol, Inst Biociencias, BR-91501970 Porto Alegre, RS, Brazil
来源
ZOOLOGIA | 2009年 / 26卷 / 01期
关键词
Aquatic insects; BioEnv; Brazil; community structure; Neotropical Region; MULTIVARIATE COMMUNITY STRUCTURE; ATLANTIC RAIN-FOREST; TRICHOPTERA ASSEMBLAGES; SPECIES RICHNESS; PATTERNS; FAUNA; EPHEMEROPTERA; DEGRADATION; PLECOPTERA; RESOLUTION;
D O I
10.1590/S1984-46702009000100013
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
The relationship between community structure and environmental factors usually varies according to ecosystem type, group of organisms, and spatial scale. In this study I assessed whether dissimilarities among assemblages of stream macroinvertebrates are related to differences in environmental variables. Data consisted of macroinvertebrate samples of 10 stream sites during the dry season. Seven environmental variables were assessed. The relationship among dissimilarities in assemblage structure and dissimilarities in environmental variables was assessed using the BioEnv approach. Conductivity and measures related to stream size were the most important variables. However, part of the correlation with conductivity was due to the high value observed in a single stream site, which presented a relatively distinct macroinvertebrate fauna. There was an abrupt change in assemblage structure between 4(th) and 5(th) order streams. Although the study included a single 5(th) order site and thus only weak generalizations are possible, this finding corroborates scattered evidence observed in previous studies. The finding that nearby sites may harbor distinct macroinvertebrate assemblages implies whole-catchment conservation strategies. As most of the remaining Atlantic Rain Forest is restricted to small fragments, restoration projects near fragments should be implemented so as to properly conserve lotic ecosystems.
引用
收藏
页码:79 / 84
页数:6
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