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Effect of sediment type, feeding level, and larval density on growth and development of a midge ( Chironomus riparius )
Author(s) -
Ristola Tiina,
Pellinen Jukka,
Ruokolainen Minna,
Kostamo Auli,
Kukkonen Jussi V. K.
Publication year - 1999
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620180423
Subject(s) - chironomus riparius , midge , larva , chironomidae , biology , sediment , instar , chironomus , ecology , zoology , paleontology
A 10‐d growth test and an emergence test were performed with Chironomus riparius Meigen in four unpolluted lake sediments (organic carbon content 0.5–57%) using different feeding levels (Tetramin® at 0.03, 0.06, 0.12, or 0.33 mg/larva/d in the growth test and 0, 0.15, or 0.30 mg/larva/d in the emergence test) to study how sediment type and feeding level affect larval growth. To examine effects of larval density on growth, another growth test was performed using densities of one larva per 24, 12, 4.8, or 2.4 cm 2 and a feeding level of Tetramin at 0.12 mg/larva/d. Regardless of sediment type, feeding was necessary in the experiments started with first‐instar larvae. The effects of sediment physicochemical characteristics on larval growth and development could not be totally compensated for by food addition. When fed, larvae grew best in sandy sediment with low organic carbon content (0.5%). Acceptable survival was achieved with a very low food dose (0.03 mg/larva/d), but a somewhat higher dose (0.12 mg/larva/d) is recommended. Increment of feeding accelerated larval growth and development. Larval growth was correlated to the food dose per individual and to the density of food particles on the sediment surface.