Emergence and lateral dispersal of adult Plecoptera and Tricoptera from Broadstone stream U.K.

I. Peterson, J.H. Winterbottom, S. Orton, N. Friberg, A. Hildrew, D.C. Speirs, William Gurney

Research output: Contribution to journalArticle

141 Citations (Scopus)

Abstract

1. Emergence and inland dispersal of adult stoneflies (Plecoptera) and caddisflies
(Trichoptera) from Broadstone Stream, an acidic and iron-rich stream in southern England, were studied over 10 months in 1996±1997. Fifteen pyramidal emergence traps were placed randomly in a 200-m stretch. Three Malaise traps were placed above the stream and six more on each side (one wooded, one open) along a transect at distances of 1, 15, 30, 45, 60
and 75 m from the channel.
2. More than 16 000 stoneflies, belonging to 11 species, and just under 400 caddisflies (22 species) were caught. Four dominant stoneflies (Leuctra fusca, Leuctra nigra, Leuctra hippopus and Nemurella pictetii) accounted for 96% and 95% of the catches in the emergence and Malaise traps, respectively. Two caddisflies (Plectrocnemia conspersa and Potamophylax
cingulatus) accounted for 63% of the catch in the Malaise traps. Few caddisflies were taken in emergence traps.
3. The emergence periods of L. fusca, L. nigra and L. hippopus were well-defined and unimodal, whereas that of N. pictetii was prolonged and erratic. Overall, more females (1285) emerged than males (740).
4. Female stoneflies and caddisflies were in the majority in the Malaise traps above the stream. On land, significantly more females than males of L. fusca, L. nigra and P. cingulatus were caught. The sex ratio of the remaining species did not deviate significantly from 1:1.
5. The three Malaise traps placed above the stream caught most of the stoneflies though there was also dispersal away from the channel, the numbers caught declining with distance. Exponential models explained between 67% and 99% of the variation in numbers of individuals with distance from the channel in the four common stoneflies. Half the individuals went less than 11±16 m from the stream, while 90% travelled less than 51 m. Significantly more L. nigra and N. pictetii were caught in the woodland than on the open side, whereas L. hippopus showed no overall preference for either side.
LanguageEnglish
Pages401-416
Number of pages16
JournalFreshwater Biology
Volume42
Early online date25 Dec 1999
DOIs
Publication statusPublished - 1999

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stonefly
Plecoptera
Malaise traps
Trichoptera
caddisfly
eclosion
Hippopus
Leuctra
emergence traps
Perlidae
erratic
sex ratio
England
woodlands
woodland
transect
iron

Keywords

  • adult insects
  • streams
  • lateral dispersal
  • emergence

Cite this

Peterson, I. ; Winterbottom, J.H. ; Orton, S. ; Friberg, N. ; Hildrew, A. ; Speirs, D.C. ; Gurney, William. / Emergence and lateral dispersal of adult Plecoptera and Tricoptera from Broadstone stream U.K. In: Freshwater Biology. 1999 ; Vol. 42. pp. 401-416.
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Emergence and lateral dispersal of adult Plecoptera and Tricoptera from Broadstone stream U.K. / Peterson, I.; Winterbottom, J.H.; Orton, S.; Friberg, N.; Hildrew, A.; Speirs, D.C.; Gurney, William.

In: Freshwater Biology, Vol. 42, 1999, p. 401-416.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Emergence and lateral dispersal of adult Plecoptera and Tricoptera from Broadstone stream U.K.

AU - Peterson, I.

AU - Winterbottom, J.H.

AU - Orton, S.

AU - Friberg, N.

AU - Hildrew, A.

AU - Speirs, D.C.

AU - Gurney, William

PY - 1999

Y1 - 1999

N2 - 1. Emergence and inland dispersal of adult stoneflies (Plecoptera) and caddisflies(Trichoptera) from Broadstone Stream, an acidic and iron-rich stream in southern England, were studied over 10 months in 1996±1997. Fifteen pyramidal emergence traps were placed randomly in a 200-m stretch. Three Malaise traps were placed above the stream and six more on each side (one wooded, one open) along a transect at distances of 1, 15, 30, 45, 60and 75 m from the channel.2. More than 16 000 stoneflies, belonging to 11 species, and just under 400 caddisflies (22 species) were caught. Four dominant stoneflies (Leuctra fusca, Leuctra nigra, Leuctra hippopus and Nemurella pictetii) accounted for 96% and 95% of the catches in the emergence and Malaise traps, respectively. Two caddisflies (Plectrocnemia conspersa and Potamophylaxcingulatus) accounted for 63% of the catch in the Malaise traps. Few caddisflies were taken in emergence traps.3. The emergence periods of L. fusca, L. nigra and L. hippopus were well-defined and unimodal, whereas that of N. pictetii was prolonged and erratic. Overall, more females (1285) emerged than males (740).4. Female stoneflies and caddisflies were in the majority in the Malaise traps above the stream. On land, significantly more females than males of L. fusca, L. nigra and P. cingulatus were caught. The sex ratio of the remaining species did not deviate significantly from 1:1.5. The three Malaise traps placed above the stream caught most of the stoneflies though there was also dispersal away from the channel, the numbers caught declining with distance. Exponential models explained between 67% and 99% of the variation in numbers of individuals with distance from the channel in the four common stoneflies. Half the individuals went less than 11±16 m from the stream, while 90% travelled less than 51 m. Significantly more L. nigra and N. pictetii were caught in the woodland than on the open side, whereas L. hippopus showed no overall preference for either side.

AB - 1. Emergence and inland dispersal of adult stoneflies (Plecoptera) and caddisflies(Trichoptera) from Broadstone Stream, an acidic and iron-rich stream in southern England, were studied over 10 months in 1996±1997. Fifteen pyramidal emergence traps were placed randomly in a 200-m stretch. Three Malaise traps were placed above the stream and six more on each side (one wooded, one open) along a transect at distances of 1, 15, 30, 45, 60and 75 m from the channel.2. More than 16 000 stoneflies, belonging to 11 species, and just under 400 caddisflies (22 species) were caught. Four dominant stoneflies (Leuctra fusca, Leuctra nigra, Leuctra hippopus and Nemurella pictetii) accounted for 96% and 95% of the catches in the emergence and Malaise traps, respectively. Two caddisflies (Plectrocnemia conspersa and Potamophylaxcingulatus) accounted for 63% of the catch in the Malaise traps. Few caddisflies were taken in emergence traps.3. The emergence periods of L. fusca, L. nigra and L. hippopus were well-defined and unimodal, whereas that of N. pictetii was prolonged and erratic. Overall, more females (1285) emerged than males (740).4. Female stoneflies and caddisflies were in the majority in the Malaise traps above the stream. On land, significantly more females than males of L. fusca, L. nigra and P. cingulatus were caught. The sex ratio of the remaining species did not deviate significantly from 1:1.5. The three Malaise traps placed above the stream caught most of the stoneflies though there was also dispersal away from the channel, the numbers caught declining with distance. Exponential models explained between 67% and 99% of the variation in numbers of individuals with distance from the channel in the four common stoneflies. Half the individuals went less than 11±16 m from the stream, while 90% travelled less than 51 m. Significantly more L. nigra and N. pictetii were caught in the woodland than on the open side, whereas L. hippopus showed no overall preference for either side.

KW - adult insects

KW - streams

KW - lateral dispersal

KW - emergence

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DO - 10.1046/j.1365-2427.1999.00466.x

M3 - Article

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EP - 416

JO - Freshwater Biology

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