Emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack
Flight of alpine stream insects has not been well studied but is an important ecological process that ensures successful mating and allows gene flow among relatively isolated populations. In this study, we collected actively flying insects along a perpendicular transect from an alpine headwater stre...
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Online Access: | https://doi.org/10.1657/1523-0430(07-072)[FINN]2.0.CO;2 |
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fteawag:oai:dora:eawag_6057 2023-05-15T14:14:38+02:00 Emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack Finn, Debra S. Poff, N. LeRoy 2008 https://doi.org/10.1657/1523-0430(07-072)[FINN]2.0.CO;2 eng eng Taylor & Francis Arctic, Antarctic, and Alpine Research--Arct. Antarct. Alp. Res.--journals:245--1523-0430--1938-4246 eawag:6057 journal id: journals:245 issn: 1523-0430 e-issn: 1938-4246 ut: 000261441100004 local: 13855 doi:10.1657/1523-0430(07-072)[FINN]2.0.CO;2 scopus: 2-s2.0-58149394855 Text Journal Article 2008 fteawag https://doi.org/10.1657/1523-0430(07-072)[FINN]2.0.CO;2 2023-04-09T04:47:33Z Flight of alpine stream insects has not been well studied but is an important ecological process that ensures successful mating and allows gene flow among relatively isolated populations. In this study, we collected actively flying insects along a perpendicular transect from an alpine headwater stream in the Colorado Rocky Mountains (U.S.A.) during the summer emergence season in two consecutive years with contrasting hydrology: 2002 had minimal snowfall the previous winter, while 2003 snowfall was above average. Flight activity patterns among four common stream taxa were similar to previously reported results from streams below treeline: Ephemeroptera and Plecoptera declined as an inverse power function, Trichoptera declined as a negative exponential function, and Simuliidae did not decrease with lateral distance. Sex ratios typically were strongly biased, possibly a result of the harsh terrestrial environment negatively influencing the naturally more sedentary sex (which varies among taxa). In 2003, the majority of common species emerged approximately one month later than in 2002, and abundance and diversity were greater in 2003 than 2002, patterns potentially attributable to increased snowpack amount and duration. Late-emerging species, by contrast, were less abundant in 2003, likely because that year emergence was delayed to later in the season, when cooler air temperatures reduce flight activity. Our results suggest that alpine streams are sensitive to interannual variation in snowpack, and therefore more research will be needed to address the potential effects of climate change and associated winter snowfall trends on these unexpectedly diverse aquatic systems. Article in Journal/Newspaper Antarctic and Alpine Research Arctic DORA Eawag |
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English |
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Flight of alpine stream insects has not been well studied but is an important ecological process that ensures successful mating and allows gene flow among relatively isolated populations. In this study, we collected actively flying insects along a perpendicular transect from an alpine headwater stream in the Colorado Rocky Mountains (U.S.A.) during the summer emergence season in two consecutive years with contrasting hydrology: 2002 had minimal snowfall the previous winter, while 2003 snowfall was above average. Flight activity patterns among four common stream taxa were similar to previously reported results from streams below treeline: Ephemeroptera and Plecoptera declined as an inverse power function, Trichoptera declined as a negative exponential function, and Simuliidae did not decrease with lateral distance. Sex ratios typically were strongly biased, possibly a result of the harsh terrestrial environment negatively influencing the naturally more sedentary sex (which varies among taxa). In 2003, the majority of common species emerged approximately one month later than in 2002, and abundance and diversity were greater in 2003 than 2002, patterns potentially attributable to increased snowpack amount and duration. Late-emerging species, by contrast, were less abundant in 2003, likely because that year emergence was delayed to later in the season, when cooler air temperatures reduce flight activity. Our results suggest that alpine streams are sensitive to interannual variation in snowpack, and therefore more research will be needed to address the potential effects of climate change and associated winter snowfall trends on these unexpectedly diverse aquatic systems. |
format |
Article in Journal/Newspaper |
author |
Finn, Debra S. Poff, N. LeRoy |
spellingShingle |
Finn, Debra S. Poff, N. LeRoy Emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack |
author_facet |
Finn, Debra S. Poff, N. LeRoy |
author_sort |
Finn, Debra S. |
title |
Emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack |
title_short |
Emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack |
title_full |
Emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack |
title_fullStr |
Emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack |
title_full_unstemmed |
Emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack |
title_sort |
emergence and flight activity of alpine stream insects in two years with contrasting winter snowpack |
publisher |
Taylor & Francis |
publishDate |
2008 |
url |
https://doi.org/10.1657/1523-0430(07-072)[FINN]2.0.CO;2 |
genre |
Antarctic and Alpine Research Arctic |
genre_facet |
Antarctic and Alpine Research Arctic |
op_relation |
Arctic, Antarctic, and Alpine Research--Arct. Antarct. Alp. Res.--journals:245--1523-0430--1938-4246 eawag:6057 journal id: journals:245 issn: 1523-0430 e-issn: 1938-4246 ut: 000261441100004 local: 13855 doi:10.1657/1523-0430(07-072)[FINN]2.0.CO;2 scopus: 2-s2.0-58149394855 |
op_doi |
https://doi.org/10.1657/1523-0430(07-072)[FINN]2.0.CO;2 |
_version_ |
1766286989421707264 |