NDLI: Increase of rotifer diversity after sewage diversion in the hypertrophic lagoon, Albufera of Valencia, Spain

Content Provider	Springer Nature Link
Author	Oltra, Rafael Alfonso, M. Teresa Sahuquillo, Maria Miracle, Maria Rosa
Copyright Year	2001
Abstract	The Albufera of Valencia is a large oligohaline hypertrophic lagoon, regulated by sluice gates according to the needs of the surrounding rice field cultivation. It is in a turbid state with permanent cyanobacterial blooms. A slight improvement was detected after diversion in the 1990s of part of the sewage flowing into it. After sewage diversion, we found that: (1) Chlorophyll concentration and rotifer densities decreased; (2) Rotifer proportions declined, due mainly to a relative increase in cladocerans; (3) Rotifer diversity increased. The two dominants of the 1980s, Polyarthra spp. in the colder period and Brachionus angularis in the warmer one, reverted after sewage diversion to a more diverse assemblage reminiscent of the 1970s, with a higher number of dominant species. In the summer of 1998, both Brachionus calyciflorus and its predator Asplanchna brightwelli, dominant in 1973, became abundant again. In 1998, an increase in the number of dominant species was also observed during water renewal periods, some of these species were new or seldomly found before in the lagoon (Proalides tentaculatus-digitus, Trichocerca pusilla at the end of rice culture, Brachionus variabilis at the end of winter flooding). Another change that indicates an improvement of water conditions is a more distinct and longer clear water phase, which occurs in the water renewal period at the end of winter and involves a Daphnia magna peak. The increased importance of this phase, promoted the flourishment of Brachionus variabilis, a facultative Daphnia epibiont never found before in the lake.
Starting Page	213
Ending Page	220
Page Count	8
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	446
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
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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