TY - JOUR
T1 - Baseline incidence of mouthpart deformities in Chironomidae (Diptera) from the Laurentian Great Lakes, Canada
AU - Burt, John
AU - Ciborowski, Jan J.H.
AU - Reynoldson, Trefor B.
N1 - Funding Information:
The baseline deformity frequency recorded in this study is spatially homogeneous, and overall sample sizes exceed most reported prev,i ouslypro- viding a much smaller standard .e rrOonre may now determine the statistical significance of elevated mentum deformity evaluations in any Great Lakes site by comparing the incidence of deformities in a study site, with the baseline incidence reported herein. This may be done by using either a good- ness-of-fit test or the normal approximation for comparing two proportions. A conservative approach consists of calculating the lower 95% confi- dence limit of the incidence of mentum deformities at a study site. If it is higher than the upper 95% confidence limit calculated from the reference data in this , study2.73% for onormus anytTarsus, and 4.%3 1for Polypedilum may conclude that there is a significant elevation in the incidence of mentum deformities ( This research was supported by research grants from the Natural Sciences and Engineering Research Council of Canada to JJHC and by grants from Environment Canada to TBR and JJHC. Spe- cial thanks go to Craig Logan at CCIW for assis- tance throughout and particularly after the stu.dy
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2003
Y1 - 2003
N2 - Larval chironomid mouthpart deformities are used as indicators of anthropogenic stress. However, there are limited data on the incidence of naturally occurring deformities. Chironomid larvae were collected from 252 reference sites throughout the Great Lakes by Environment Canada from 1991 through 1993. Overall incidence of mentum deformities was 2.27% for Procladius (SE = 0.46, n = 1055), 2.15% for Chironomus (SE = 0.51, n = 839), 1.27% for Heterotrissocladius (SE = 0.57, n = 393), 1.38% for Tanytarsus (SE = 0.61, n = 363), and 3.25% for Polypedilum (SE = 1.07, n = 277). The most common deformity was one missing tooth in the mentum. Deformity frequency was highest in Northern Channel and Georgian Bay of Lake Huron. However, incidences were homogeneous among regions (G-test, p > 0.05). In examining contaminated conditions, a result greater than one 95% confidence interval above these reference deformity frequencies should be considered significantly elevated from baseline levels.
AB - Larval chironomid mouthpart deformities are used as indicators of anthropogenic stress. However, there are limited data on the incidence of naturally occurring deformities. Chironomid larvae were collected from 252 reference sites throughout the Great Lakes by Environment Canada from 1991 through 1993. Overall incidence of mentum deformities was 2.27% for Procladius (SE = 0.46, n = 1055), 2.15% for Chironomus (SE = 0.51, n = 839), 1.27% for Heterotrissocladius (SE = 0.57, n = 393), 1.38% for Tanytarsus (SE = 0.61, n = 363), and 3.25% for Polypedilum (SE = 1.07, n = 277). The most common deformity was one missing tooth in the mentum. Deformity frequency was highest in Northern Channel and Georgian Bay of Lake Huron. However, incidences were homogeneous among regions (G-test, p > 0.05). In examining contaminated conditions, a result greater than one 95% confidence interval above these reference deformity frequencies should be considered significantly elevated from baseline levels.
KW - Chironomidae
KW - Deformity
KW - Mouthpart
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U2 - 10.1016/S0380-1330(03)70425-0
DO - 10.1016/S0380-1330(03)70425-0
M3 - Article
AN - SCOPUS:0037256792
SN - 0380-1330
VL - 29
SP - 172
EP - 180
JO - Journal of Great Lakes Research
JF - Journal of Great Lakes Research
IS - 1
ER -