TY - JOUR
T1 - Size of anal papillae in chironomids :Does it their salinity stress?
AU - Kefford, Ben
AU - Reddy-Lopata, Kasturi
AU - Clay, Colin
AU - Hagen, Tarah
AU - Parkanyi, Orsolya
PY - 2011
Y1 - 2011
N2 - Salinity of inland waters is affected by a range of human activities and is regarded as a majo renvironmental contaminant in many parts of the world. Changes in salinity are well known to be associated with changes in macroinvertebrate communities of flowing waters. However, as many environmental factors co-vary with salinity, it is not known whether, and if so how, salinity causes communities to change. Being able to measure the osmoregulatory stress that individual stream macroinvertebrates are experiencing would be useful to understand if and how salinity affects their populations and thus communities. Additionally, inferring salinity stress in individual invertebrates could provide a valuable biomonitoring tool to detect the initial effects of salinity before major ecological changes have occurred. Osmoregulationin larval Chironomidae(Diptera)takes place in the anal papillae and their size is believed to be associated
with latorystress. In two laboratory experiments and a field survey in southern Victoria, Australia, we determine if the size of the anal papillae of larva chironomids is a useful biomarker of salinity stress. Experiments with Chironomus oppositus showed that the surface area of the anal papillae was similar in larva hatched across 5 egg masses collected from 3 sites but were affected by salinity treatments. Furthermore, the(transformed)ratio of this surface area to the body length of the larva was independent of the size of C. oppositus. However,for Chironomus cloacalis, this surface area differed between larva hatched from egg masses collected from the same site. The expected trend in surface area of the anal papillae relative to the size of larva (Chironomu alternans, C. cloacalis, Dicrotendipes sp., Criptochironomus sp. and Tanypodinae)was not duplicated in the field survey. It would appear that unknown factors, other than salinity, are affecting the size of the anal papillae of chironomids in southern Victoria.
AB - Salinity of inland waters is affected by a range of human activities and is regarded as a majo renvironmental contaminant in many parts of the world. Changes in salinity are well known to be associated with changes in macroinvertebrate communities of flowing waters. However, as many environmental factors co-vary with salinity, it is not known whether, and if so how, salinity causes communities to change. Being able to measure the osmoregulatory stress that individual stream macroinvertebrates are experiencing would be useful to understand if and how salinity affects their populations and thus communities. Additionally, inferring salinity stress in individual invertebrates could provide a valuable biomonitoring tool to detect the initial effects of salinity before major ecological changes have occurred. Osmoregulationin larval Chironomidae(Diptera)takes place in the anal papillae and their size is believed to be associated
with latorystress. In two laboratory experiments and a field survey in southern Victoria, Australia, we determine if the size of the anal papillae of larva chironomids is a useful biomarker of salinity stress. Experiments with Chironomus oppositus showed that the surface area of the anal papillae was similar in larva hatched across 5 egg masses collected from 3 sites but were affected by salinity treatments. Furthermore, the(transformed)ratio of this surface area to the body length of the larva was independent of the size of C. oppositus. However,for Chironomus cloacalis, this surface area differed between larva hatched from egg masses collected from the same site. The expected trend in surface area of the anal papillae relative to the size of larva (Chironomu alternans, C. cloacalis, Dicrotendipes sp., Criptochironomus sp. and Tanypodinae)was not duplicated in the field survey. It would appear that unknown factors, other than salinity, are affecting the size of the anal papillae of chironomids in southern Victoria.
KW - Salinization
KW - Anal papillae
KW - Chloride cells
KW - Mitochondria-rich cells
KW - Chloride epithelia
KW - Biomarkers
KW - Chironomidae
KW - Diptera
KW - Stream invertebrates.
U2 - https://www.elsevier.com/open-access/userlicense/1.0/10.1016/j.limno.2010.09.004
DO - https://www.elsevier.com/open-access/userlicense/1.0/10.1016/j.limno.2010.09.004
M3 - Article
SN - 0075-9511
VL - 41
SP - 96
EP - 106
JO - Limnologica
JF - Limnologica
ER -