Journal
HYDROBIOLOGIA
Volume 743, Issue 1, Pages 27-35Publisher
SPRINGER
DOI: 10.1007/s10750-014-2000-8
Keywords
Zooplankton size; Latitudinal patterns; Global comparison
Categories
Funding
- South Florida Water Management District
- MARS project (Managing Aquatic ecosystems and water Resources under multiple Stress) under the 7th EU Framework Programme, Theme 6 [603378]
- TUBITAK-CAYDAG [105Y332, 110Y12]
- Research Council for Nature and Universe, Greenland Climate Research Centre
- Danish Agency of the Environment
- National Science Foundation (NWO) [R83-206]
- Schure-Beijerinck-Popping Fund of the Royal Netherlands Academy of Arts and Sciences (KNAW) project [SBP/JK/2004-14]
- National Science and Engineering Research Council
- Ontario Ministry of Natural Resources
- CNPq [Proc. 521.513/93-6]
- FAPEMIG [CBS 1897/96]
- CRIS Project [FLA-FRE-005152]
- National Sea Grant College Program of the United States Department of Commerce, National Oceanic and Administration, under NOAA Grant [NA06OAR-4170014]
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The body size of zooplankton has many substantive effects on the function of aquatic food webs. A variety of factors may affect size, and earlier studies indicate that water temperature may be a particularly important variable. Here we tested the hypothesis that the body size of cladocerans, calanoids, and cyclopoids declines with increasing water temperature, a response documented in an earlier study that considered only cladoceran zooplankton. We tested the hypothesis by comparing body size data that were available from prior studies of lakes ranging from 6 to 74 degrees latitude and encompassing a temperature range of 2-30 degrees C. Cladoceran body size declined with temperature, in a marginally significant manner (P = 0.10). For cyclopoids, the decline was more significant (P = 0.05). In both cases, there was considerably more variation around the regression lines than previously observed; suggesting that other variables such as fish predation played a role in affecting size. Calanoid body size was unrelated to temperature. In contrast with cladocerans and cyclopoids, perhaps calanoid body size is not metabolically constrained by temperature or is differently affected by changes in fish predation occurring with increasing temperature. The unexpected result for calanoids requires further investigation.
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