Abstract:
:Many species of planktonic cladocerans display substantial variation in habitat use (mean depth and diel vertical migration), both among and within populations. We examined whether clonal segregation and specialization contributes to such behavioral variation within several lake populations of the cladoceran, Daphnia pulicaria. Electrophoretic and quantitative genetic analysis of clonal lines isolated from different depths at night revealed that clonal habitat specialization was common. Clones that utilized shallow water at night were genetically smaller at maturity and lower fecundity under standard laboratory conditions than the deep-water clones. The magnitude of this clonal habitat specialization varied among lakes: populations displaying broad use of depth habitats contained greater genetic variance than populations with more constrained habitat use. These results are consistent with known differences in selective factors in different depth habitats and suggest that substantial clonal specialization can occur within single populations. Since previous work has discovered a heritable basis to habitat selection in several Daphnia species, including D. pulicaria in our study lakes, it is likely that clonal/depth specialization is an important factor affecting the trophic ecology of Daphnia.
journal_name
Oecologiajournal_title
Oecologiaauthors
Tessier AJ,Leibold MAdoi
10.1007/s004420050117subject
Has Abstractpub_date
1997-02-01 00:00:00pages
561-570issue
4eissn
0029-8549issn
1432-1939pii
10.1007/s004420050117journal_volume
109pub_type
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