NDLI: Rotifer vertical distribution in a strongly stratified lake: a multivariate analysis

Content Provider	Springer Nature Link
Author	Armengol, X. Esparcia, A. Miracle, M.R.
Copyright Year	1998
Abstract	The main source of variation of rotifer species distributions in lake Arcas-2, a small karstic lake near Cuenca (Spain), was explored by means of principal components factor (PCA) and canonical correlation (CCA) analyses. PCA was performed using rotifer densities and CCA using rotifer densities plus physical and chemical parameters. Factor 1 of PCA separated summer species from winter–spring species and Factor 2 accounted for the variation in the vertical profile. Three summer species with different food habits (Polyarthra dolichoptera, Hexarthra mira and Asplanchna girodi) were grouped together at the positive end of Factor 1, while Factor 2 separated the two hypolimnetic species (Filinia hofmanni and Anuraeopsis fissa) from the rest. The relative position of rotifer species in the space determined by the CCA was roughly the same. The most significant environmental factors that became paired with rotifer distribution in the CCA were temperature and oxygen, and parameters related to water inflow. Segregation of filter-feeding species in the spatio–temporal subenvironments is clearly shown by the multivariate analysis.The low diversity of rotifer species found in Lake Arcas-2 is attributed to the reduced dimensions of the lake and its morphology. This lake resembles a sinkhole with an abruptly sloping shoreline and poor development of the littoral zone. This morphology favors a strong oxygen stratification. Since midsummer the oxic–anoxic boundary is located in the upper metalimnion, the vertical structure of the oxygenated water column is simplified. This low rotifer diversity contrasts with a high ciliate diversity in the anoxic waters.
Starting Page	161
Ending Page	170
Page Count	10
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	387
Issue Number	0
e-ISSN	15735117
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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