Correspondence between regional delineations and spatial patterns in macroinvertebrate assemblages of boreal headwater streams

2002 ◽  
Vol 21 (3) ◽  
pp. 397-413 ◽  
Author(s):  
Jani Heino ◽  
Timo Muotka ◽  
Riku Paavola ◽  
Heikki Hämäläinen ◽  
Esa Koskenniemi
Keyword(s):  
Spatial Patterns ◽  
Headwater Streams ◽  
Macroinvertebrate Assemblages

Experimental effects of ash deposition on macroinvertebrate assemblages in peatland streams

2018 ◽  
Vol 69 (11) ◽  
pp. 1681
Author(s):  
K. Johnston ◽  
B. J. Robson
Keyword(s):  
Environmental Conditions ◽  
Significant Relationship ◽  
Headwater Streams ◽  
Dry Mass ◽  
Ash Deposition ◽  
Assemblage Composition ◽  
Macroinvertebrate Assemblages ◽  
Natural Stream ◽  
And Control ◽  
Stream Depth

Rotational burn management has been practiced for >150 years in UK peatlands; however, little information exists on its effects on streams. An experiment investigated effects of ash input on four UK headwater streams by depositing ash onto trays filled with natural stream substrata. Before the experiment, streambed samples (SS) were taken to describe ambient macroinvertebrate assemblages. Macroinvertebrate response after 21 days was compared among SS, low (50g), high (100g) and top-up (50g + 50g dosed twice) ash-addition treatments and control trays (0g ash addition). Additions increased tray ash-free dry mass (AFDM), and by the end of the experiment, some trays retained more ash than did others (F12,72=5.15, P<0.001). Macroinvertebrate assemblages differed among streams (r=0.84, P<0.001) and treatments (r=0.23, P<0.001). SS contained fewer shredders than did other treatments (range: r=0.35–0.52, P=0.005). A significant relationship was found between assemblages and environmental conditions (Spearmans rho: 0.203, P=0.001). Stream depth and AFDM showed strongest correlations with assemblages. Ash deposition affects macroinvertebrate assemblages when deposited onto streambeds. However, the high among-stream variation in assemblage composition typical of UK headwaters is a stronger source of variation, suggesting that the effect of deposition is reasonably small in these streams.

scholarly journals Do wider riparian zones alter benthic macroinvertebrate assemblages’ diversity and taxonomic composition in neotropical headwater streams?

2021 ◽  
Vol 33 ◽  
Author(s):  
Marden S. Linares ◽  
Livia B. dos Santos ◽  
Marcos Callisto ◽  
Jean C. Santos
Keyword(s):  
Riparian Zone ◽  
Headwater Streams ◽  
Taxonomic Composition ◽  
Functional Structure ◽  
Riparian Zones ◽  
Benthic Macroinvertebrate ◽  
Freshwater Ecosystem ◽  
Benthic Assemblages ◽  
Macroinvertebrate Assemblages ◽  
Zone Width

Abstract: Aim The maintenance and condition of riparian vegetation are important factors for conserving headwater streams and their species diversity. Thus, variations in the width of a riparian zone can have dramatic effects in the structure and functioning of the adjacent freshwater ecosystem. In this study, we aimed to determine if increased riparian zone width changed the benthic assemblages’ structure (diversity, taxonomic and functional composition) in headwater streams. Methods We tested two predictions: (1) increased riparian zone width will change the diversity and taxonomic composition of benthic macroinvertebrate assemblages because narrow riparian zones do not buffer the anthropogenic impacts from the surrounding landscape; (2) wider riparian zones will change benthic macroinvertebrate assemblages’ functional structure, due to changes to energetic input and quality. To test the first prediction, we assessed the benthic macroinvertebrate assemblages’ taxonomic composition, richness and Shannon-Wiener diversity index. To test the second prediction, we assessed functional feeding groups (FFG) and metrics based on their proportion. Results Our results showed that our first prediction was not corroborated, because taxonomic structure and diversity did not show significant variation with increased riparian zone width. Our second prediction was partially corroborated, because there were significant alterations in the functional structure of benthic macroinvertebrate assemblages between the narrowest riparian zone width (30 m) and the others two (50 and 100 m). Conclusions Our results suggest that, contrary to the Brazilian Federal Law 12651/2012, 30-m wide riparian zones are insufficient to protect headwater stream ecosystem functioning.

scholarly journals Environmental influences on macroinvertebrate assemblages in headwater streams of northeastern Ohio

2011 ◽  
Vol 26 (3) ◽  
pp. 409-422 ◽  
Author(s):  
Kathryn L. Holmes ◽  
P. Charles Goebel ◽  
Lance R. Williams ◽  
Marie Schecengost
Keyword(s):  
Headwater Streams ◽  
Environmental Influences ◽  
Macroinvertebrate Assemblages
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