International Rotifer Symposia: prospects and retrospects from Rotifera XI
© Sarma; licensee BioMed Central Ltd. 2006
Received: 10 April 2006
Accepted: 15 May 2006
Published: 15 May 2006
The XI International Rotifer Symposium was held during 11–18 March, 2006 at the National Autonomous University of Mexico Campus Iztacala located at the North Mexico City (Mexico). These triennial international meetings, first organized in Austria by Late Ruttner-Kolisko in September 1976, are gradually becoming the focal point of discussion and collaboration from rotifer workers across the world. The present XI symposium was attended by 125 participants from 20 nations. During this meeting, different themes of rotifer research from morphology to molecular biology were considered. In addition, there were four invited lectures and four workshops covering different themes of the symposium. During the last 30 years, rotifer research has witnessed gradual shift from the conventional morphological taxonomy to molecular and evolutionary systematics. While the basic rotifer ecological studies continue today, applied areas such as ecotoxicology and aquaculture have taken key roles in the recent meetings. The international rotifer meetings provide ample opportunities not only for exchange of ideas and recent research, but also for material and in establishing inter-personal relationships. Over the last 30 years, the number of participants attending the rotifer meetings has increased.
Rotifers are small (<2 mm) and beautiful invertebrates, harmless to mankind. Their use as model organisms in teaching courses of biology, as a scandalous group in evolutionary ecology, as larval diet in aquaculture and as sensitive indicators of water quality has been widely recognized. Moreover, due to their high metabolic rates, they regenerate nutrients trapped in phytoplankton and detritus on which they feed . There are about 2150 rotifer species globally. The fact that new species are currently discovered from different parts of the world suggests that the taxonomic studies on rotifers are far from complete in spite of its 300 year old history [2, 3].
Details of the International Rotifer Symposia so far held. Symp: Symposium series, Part.: number of participants; Nat.: Nations represented.
Date and place
Journal, vol., year
No. of articles
21–26 Sept, 1976; Lunz, Austria
Arch. Hydrobiol. Beih., 8, 1977,
17–21 Sept. 1979; Ghent, Belgium
Hydrobiologia, 73, 1980
30 Aug. – 4 Sept. 1982
Hydrobiologia, 104, 1983
18–25 Aug. 1985
Hydrobiologia, 147, 1987
12–17 Sept. 1988, Gargnano, Italy
Hydrobiologia, 186/187, 1989
3–8 June 1991, Banyoles, Spain
Hydrobiologia, 255/256, 1993
6–11 June 1994, Mikolajki, Poland
Hydrobiologia 313/314 1995
22–27 June 1997, Collegeville, Minn. USA
Hydrobiologia, 387/388, 1998
16–23 Jan 2000, Khon Kaen, Thailand
Hydrobiologia 446/447, 2001
7–13 June 2003, Illmitz, Austria
Hydrobiologia 546, 2005
11–18 March 2006, Mexico City, Mexico
Expected to appear in Hydrobiologia
Results and discussion
While many symposia are conducted at hotels, mainly due to logistic convenience, the present one was held in a university. In this way, several students and young faculty members were in fact stimulated by the presence of a great number of renowned researchers. This is evident from a report appeared recently in the University Gazette . The Rotifera XI distinguished from all other previous ones in the sense that symposium took full advantage of the internet revolution. No formal invitation letters or the publicity material were printed on paper. All such information had been stored and mailed electronically. Two rotifer workers (Robert Wallace and Terry Snell) had attended all the 11 symposia without missing even a single meeting and thus received a university medal "Dedicated Rotifer Researcher". Five previous organizers of the rotifer meeting (HJ Dumont, MR Miracle, J Ejsmont-Karabin, LO Sanoamuang and A Herzig), who were present during Rotifera XI, also received the university medals for passing on the torch of successful rotifer symposium.
Rotifer symposia have a long and honourable tradition of a mid-conference excursion to some well known freshwater bodies. During the Rotifera XI the participants had an opportunity to visit a UNESCO world heritage site, the Xochimilco Lake.
Emphasis on different themes
Theme-wise contributions presented during the XI International Rotifer Symposium
Number of presentations
Feeding, trophic interactions, behaviour, autecology and population ecology
Morphology, taxonomy, zoogeography & field ecology
Molecular biology, evolution, genetics and biochemistry
Ecotoxicology and indicator species
Aquaculture and mass production
The section on the trophic interactions and population ecology considered many diverse aspects. The most interesting from the point of salinity stress and the rotifer ecology was the invited talk by Peter Starkweather. Though many rotifer species are restricted to freshwaters, some do inhabit hypersaline desert endorheic water bodies. Salinity has strong effects on both density and diversity of rotifers. S. Nandini and her colleagues presented data on rotifer diversity and abundance through seasons and at different depths from one of largest drinking water reservoirs in Mexico (Valle de Bravo).
The importance of morphological and molecular data on the rotifer phylogeny was considered during this symposium. This was supplemented by the workshop on DNA barcodes by C.W. Birky Jr. Cross mating experiments within the different geographical populations appear to show the existence of a species complex in the rotifer Ephiphanes senta. The limited molecular work on Plationus did not consider other biological characteristics such as male or resting egg morphology, demography or cross mating or mate-recognition factors for deriving phylogenetic relationship within Brachionidae. Hence its taxonomic status still remains unresolved. Mark Welch presented a nice account on phylogenetics and ribosomal gene evolution in the bdelloid rotifers, a group where males are totally absent.
The aquacultural application of rotifers is not steadily increasing with the same pace as shrimp or fish production, where they are widely used as live food. Some reasons seem to be: a) mass culture techniques of rotifers are nearly stabilized on a global scale  and possibly, since Artemia cysts are relatively easy to procure, marine aquaculture largely employs these anostracans. Nevertheless, attempts to improve the nutritional quality of rotifers were presented during this symposium.
Ecotoxicological aspects of rotifers were represented by as many as seven different groups. Most of these contributions during this symposium considered population level effects of different toxic substances on monogonont rotifers. Field-based studies were poorly represented. The workshop on ecotoxicology co-chaired by Terry Snell and Célia Joaquim-Justo invited lively discussion from the participants. There is a great practical application of rotifers in ecotoxicological evaluations and developing safety standards for water quality.
Over the last 30 years, the number of participants attending the rotifer meetings is on the rise. The number of countries representing these events has stabilized to around 20. During the Rotifera XI, almost every aspect of rotifer research – both basic and applied was discussed.
I thank Prof. Dr. Shiladitya DasSarma for inviting me to contribute this work. My wife Dr. S. Nandini offered many suggestions during the preparation of the manuscript. Three anonymous reviewers have critically evaluated this contribution. Ramiro Jesús Sandoval and Ignacio Peñalosa Castro extended full administrative support for the Symposium. Mexican National Council for Science and Technology (CONACyT) supported the event financially (DASJ 1100/590/05 ACAC-050187).
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