基隆河水棲昆蟲群聚生態和生物指標之研究與水棲甲蟲分類研究(2/3)
Date Issued
2004
Date
2004
Author(s)
楊平世
DOI
922313B002067
Abstract
The community structures of aquatic
insects are affected by various disturbances
in rivers. Ordination techniques are widely
adopted in evaluating the temporal and
spatial variations of community structures.
This study present the results of aquatic
insects fauna and related ecological studies
conducted at 15 sampling sites in Keelung
River and its tributaries since August 2003.
The environmental factors and the aquatic
insect composition were investigated to
define the relationships between the
community structures and environmental
parameters using multi-dimensional scaling
3
(MDS). The results of environmental
variables indicated that higher values in
conductivity, turbidity, suspended solids and
the concentration of NH3-N were found at
sites in main streams. The water quality at
tributary sites was better than at main stream
sites. Sixty-three taxa in 36 families were
recorded. Most of the newly recorded taxa
were found at tributary sites. Higher
values of taxa richness, density and diversity
were also found at tributary sites.
Evenness was not suitable for evaluating the
community structures. The sampling sites
which affected by pollution and engineer
construction revealed different community
structures from other sites on the 2-D
dimensional scaling plot. The similarity of
aquatic insect community structures between
sites of main stream and tributaries were
40-50% in clustering analysis. Biotic
indices showed better water qualities in
tributaries than in the main stream. The
water quality degraded from upstream to
downstream in the main stream. The
results in the second season showed better
quality than in the first season. The further
analysis, including the relationships between
biotic parameters and environmental
variables, the differences of variables
between sampling sites, and the key species
contributed to the differences of the
community structures between the main
stream and tributaries. The location of
reference site and revision of the tolerance
values of aquatic insects were major work in
the study on aquatic insect biotic indices.
In different substrate size level, the
ordination plots of sampling sites showed
different patterns, but positive correlation
was found between values of family-level
biotic index. The taxonomic studies of
aquatic beetles focused on Psephenidae.
Several papers on the revision of genus
Mataeopsephus and the rediscription of
Heteropsephenoides were completed and
published.
Subjects
Keelung River
Aquatic insects
Multidimensional scaling
Community structure
Biotic indices
Psephenidae
Taxonomy
SDGs
Publisher
臺北市：國立臺灣大學昆蟲學系暨研究所
Type
report
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