Diversity and abundance of nematodes in the sewage
of Jodhpur, Rajasthan, India
Razia Sultana 1 & Padma Bohra 2
1,2Desert Regional Centre, Zoological
Survey of India, Jhalamand, PaliRoad, Jodhpur, Rajasthan 342005, India
Email:1 razia.sultana25@gmail.com (corresponding author), 2 bohrapadma@gmail.com
Date of publication (online): 26 May
2012
Date of publication (print): 26 May
2012
ISSN 0974-7907 (online) | 0974-7893
(print)
Editor: Anonymity requested
Manuscript details:
Ms # o3044
Received 23 December 2011
Final received 06 March 2012
Finally accepted 06 April 2012
Citation: Sultana, R. & P. Bohra (2012). Diversity and abundance of
nematodes in the sewage of Jodhpur, Rajasthan, India. Journal
of Threatened Taxa4(5): 2614Ð2616.
Copyright: © RaziaSultana & Padma Bohra2012. Creative Commons Attribution 3.0 UnportedLicense. JoTT allows unrestricted use of this
article in any medium for non-profit purposes, reproduction and distribution by
providing adequate credit to the authors and the source of publication.
Acknowledgement:Authors are
grateful to Dr.K.Venkataraman for providing research
facilities in preparation of this paper.
Nematodes are aquatic,
semi-aquatic and terricolous organisms in nature and
among the most important organisms in decomposer communities. Nematode
community structure in polluted water as studied by Beier& Traunspurger (2001) revealed that nematodes can
be used as bioindicators of soil health because they
are ubiquitous and have diverse feeding behavioursand life strategies (Bongers & Bongers 1998; Neher 2001). Bacterial feeding nematodes have the
greatest contribution to the decomposer food web. These decomposer nematode species do not feed directly on
organic matter but they graze on microbes and excrete ammonia. Thus, nematodes contribute to nitrogen
mineralization. Since nematodes
respond rapidly to new resources and the nematode fauna can be analyzed, the
structure of the nematode community offers an instrument to assess the
condition of the ecosystem.
Material and methods: Sediment
samples were processed by sieving and decantation and a slightly modified BaermannÕs funnel technique. Nematodes were fixed in hot formalin. For permanent mounts, specimens were
dehydrated by the slow method and mounted in anhydrous glycerin. The individual species population and
the total nematode counts were taken. Measurements were made using a drawing tube mounted on a Nikon Eclipse
E600 microscope and photographs were taken using a Nikon digital camera DS-Fi1.
Results: A total of 39 species of
nematodes were identified from sewage water of various localities of Jodhpur
and adjoining areas (Table 1). Five functional nematode trophic groups were
identified based on morphological structures and modes of feeding such as
herbivores, bacterivores, fungivores,
omnivores and predators. In terms
of individual abundance, bacterivores (rhabditids) were the most dominant group represented
followed by predators, herbivores, omnivores and fungivores. In terms of taxonomic diversity cephalobids were the most abundant group followed by rhabditis/diplogastrids among the bacteriovores. Mononchoides, Mesorhabditis and Diplogasteritus were found the most
dominant genera in the sewage water.
Discussion: Nematode frequency, density
and diversity vary depending upon ecological and edaphicfactors (Sohlenius 1979; Khatoonet al. 2001). The present study
revealed a great deal of generic diversity within the nematode community. A total of 39 nematode species were
identified, representing bacterivores (14 genera),
predators (six genera), omnivores (three genera), herbivores (two genera) and fungivores (one genus). Fifty species of nematodes representing five trophic groups were reported in the sewage waters (Tahseen 2006). Most of the nematode species were microbe grazing which have been
reported to regulate the rates of decomposition (Yeates& Coleman 1982). Increased bacterivores diversity shows the increased diversity of
microbes thus reflecting the nature and quality of the environment. This present study shows a high
nematode density and low species diversity in the sewage water.
References
Beier, S. & W. Traunspurger (2001). The meiofaunacommunity of two German streams as indicator of pollution. Journal of Aquatic Ecosystem Stress and Recovery 8: 387Ð405.
Bongers, T. & M. Bongers (1998). Functional diversity of nematodes. Applied Soil Ecology10: 239Ð251.
Khatoon, M., S. Sharma &
S.K. Saxena (2001). Community
analysis of predatory nematodes of Rohilkhanddivision. U.P. Current Nematology 12: 11Ð14
Neher, D.A. (2001). Role of nematodes in soil
health and their use as indicators. Journal of Nematology 33: 161Ð168.
Sohlenius, B. (1979). A carbon budget for nematodes, rotifers and tardigrades in a Swedish coniferous forest sil. Holarctic Ecology 2: 30Ð40.
Tahseen, Q. (2006). Taxonomic diversity in sewage nematodes of
Aligarh, North India. International
Journal of Nematology 16: 1Ð6.
Yeates, G.W. & D.C.
Coleman (1982). Nematodes in decomposition, pp. 55Ð80. In: Freckman,
D.W. (ed.). Nematodes in Soil Ecosydstems. University
of Texas, Austin TX, USA.