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Daphnia hemoglobin concentration as a function of depth and oxygen availability in Arco Lake, Minnesota 1
Author(s) -
Landon M. Steven,
Stasiak Richard H.
Publication year - 1983
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1983.28.4.0731
Subject(s) - daphnia pulex , hemoglobin , oxygen , population , zoology , biology , daphnia , branchiopoda , ecology , chemistry , cladocera , zooplankton , biochemistry , demography , organic chemistry , sociology
Hemoglobin synthesis by Daphnia pulex is common in temporary ponds where oxygen is limited, resulting in animals with bright red pigmentation. Arco Lake is not oxygen‐limited in the upper 5 m but has maintained a population of red D. pulex for several years. Relative densities of Daphnia over time were determined from inverted funnel traps suspended at 0.5‐m depth intervals. The majority of the population stratified at 6.5 m, where the mean oxygen was 0.47 mg · liter −1 . Hemoglobin concentrations in the lowest levels ranged from 60 to 155 mg Hb · g −1 . Those individuals which migrated the greatest distances into the higher oxygen levels maintained the smallest concentrations of hemoglobin. The lack of visual predators in Arco Lake apparently allowed relatively high basal hemoglobin concentrations (ca. 23 mg Hb · g −1 ) even in those Daphnia lacking access to low oxygen concentrations.