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Title: Comparison of Surface-active Beetle (Order: Coleoptera) Assemblages in Remnant and Restored Riparian Forests of Varying Ages on the Middle Sacramento River |
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Abstract/Description: Composition of epigeal (surface-active) beetle assemblages (Order:
Coleoptera) from monthly invertebrate sampling within younger riparian restoration sites
(1-3 years old), older riparian restoration sites (6-10 years old), and remnant riparian
forests (>25 years old) were compared in order to examine effects of forest age and
riparian restoration efforts on beetles along the Sacramento River, California. Six
restoration sites (1-10 years old) planted by The Nature Conservancy’s Sacramento River
Project were selected for sampling and separated categorically into young and old
restoration sites. Restoration sites were compared to three adjacent remnant riparian
forest sites. Pitfall sampling of epigeal beetles was carried out monthly between
December 2000 and November 2001. All beetles were sorted into a temporary
alphanumeric “morphospecies” reference collection and database for subsequent
identification. Morphospecies were identified to the lowest taxonomic level practicable.
We used nonmetric multidimensional scaling, cluster analysis, and multiple response
permutation procedures to examine sample assemblage response to forest type at the
order and family level. For individual morphospecies we used either analysis of variance
or a Kruskal-Wallis nonparametric test of the mean monthly trap catches to determine
whether forest type significantly affected morphospecies abundance. Indicator species
analysis was performed on mean monthly trap catches to calculate individual
morphospecies’ values as “indicators” of different forest types.
Ordination and cluster analysis at the order level, and for at least three families,
showed a strong response of sample assemblages to forest age. We also found that
sample assemblages showed a significant effect of categorical forest type. Temporal
analyses of sample assemblages at the order level also showed a significant difference
between forest type “trajectories” for the sample-year. Analysis of trap data for
individual morphospecies indicated a significant response to forest type by a large
number of species. Neither Shannon-Weiner diversity indices nor species richness were
significantly different between forest types; however, these metrics did not reflect
differences in sample assemblage composition between either sites or forest types (i.e.
young restoration, old restoration, and remnant riparian forest sites). Monthly abundance
was significantly higher in remnant riparian habitats, but was related to species-specific
trap abundances. Because of these factors, diversity, species richness, and trap
abundance were not considered reflective of differences in compositional characteristics
of epigeal beetle communities in these forest types. Results indicate that: 1) samples
from forests of different ages contain characteristic species; 2) epigeal beetle assemblages
within remnant riparian sites were most similar to one another; 3) younger restoration
sites showed greater differences in composition amongst themselves and through time
than did old restoration and remnant riparian forest sites; 4) response of epigeal beetle
assemblages to restoration efforts varied at the family level; 5) several species which
showed significant effect of forest type also had restricted geographic and/or seasonal
distributions within the study area; and 6) a general assemblage trajectory based on forest
age appears to be demonstrated in the data. From these results it appears that riparian
restoration efforts are providing habitat for many species of beetles characteristic of
remnant riparian forests.
Associated Projects:
Non-Aeration Feasibility Studies Criteria Evaluation for the San Joaquin River Dissolved Oxygen TMDL, Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Non-Aeration Feasibility Studies Criteria Evaluation for the San Joaquin River Dissolved Oxygen TMDL
Main Subjects:
Habitat / Species
Specific Subjects:
invertebrates
Species Keywords:
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| Publication & Citation |
Author(s):
John Hunt, Scott Chamberlain
Contributor(s):
Gregory Golet, Mike Roberts, Daryl Peterson, Joe Silveira, Tom Griggs, Jean Hubbell, Kirby Brown
Citation:
Hunt J., S. Chamgerlain, and D.M. Wood. 2003. Comparison of Surface-active Beetle (Order: Coleoptera) Assemblages in Remnant and Restored Riparian Forests of Varying Ages on the Middle Sacramento River. Report to the Nature Conservancy.
Publisher:
The Nature Conservancy
Publication Date:
December
31,
2002
Currentness:
Funder(s):
The Nature Conservancy,
CALFED
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| Format & Access |
Information Resource Type:
(Documents)
Media Type / Format:
Computer File
Access Limitations:
Public
Use Limitations:
No Limitations
To Obtain:
Download from this site
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| Location Information |
Cities / Urban Areas:
Counties:
Specific Location Names:
Rio Vista Unit of the SRNWR, Merrils Landing DFG Unit
Undefined:
Water / Special Districts:
Watershed / Streams:
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First Entered by:
Greg Golet on 2003/10/08
Last Edited by:
Greg Golet on 2003/10/08
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