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Diversity, dynamic and ecology of freshwater snails related to environmental factors in urban and suburban streams in Douala–Cameroon (Central Africa)

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Abstract

Urban land use has increased dramatically over the past few decades, resulting in high variability in nutrients loading which is likely to alter the biological component of urban streams. Freshwater snails and environmental variables that might structure their diversity and distribution were studied from September 2012 to September 2013 in three contiguous watersheds in Douala. Twelve stations were monitored monthly, two of these are located in a suburban forest area, and the rest situated in urbanized and industrialized zones. Snails were collected using a long-handled net (30 × 30 cm side, 400-µm mesh). Meanwhile, measurements of the environmental variables were taken. Ten species were recorded which are as follows: Melanoides tuberculata (Thiaridae); Gabbiella africana (Bythiniidae); Physa acuta, Aplexa sp. (Physidae); Lymnaea natalensis, Lymnaea stagnalis, Lymnaea columella (Lymnaeidae); Biomphalaria pfeifferi, Bulinus forskalii (Planorbidae) and one undetermined taxon of Bythiniidae. All these snails were identified at nine of the ten urban stations; no species being found in suburban stations. These urban streams have very poor health status with highly polluted waters. Among the species found P. acuta (76.95 %), L. natalensis (19.46 %) and M. tuberculata (2.79 %) were the most abundant. Multiple stepwise regression analysis, Spearman correlation test and redundancy analysis showed that snail occurrences and abundances were probably influenced by water temperature, conductivity, suspended solids, alkalinity, nitrites, nitrates, ammonium, phosphates, oxydability, biochemical oxygen demand, rainfall, encumbrance rate of the riverbed and water width. Moreover, snail dynamics showed a seasonal pattern with peak population abundances and recruitment of young generations during rainy season. This malacological survey spotlighted the impacts of anthropogenic activities on snail’s diversity and distribution, with the proliferation of the invasive pulmonate P. acuta in Douala urban streams.

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Acknowledgments

This malacological survey was achieved thanks to the financial support of the Intra-African Mobility Program (PIMASO) and the International Foundation for Sciences (IFS). Authors would like to gratefully acknowledge Pr. Jean Pierre POINTIER and Dr. Norbert Kouakou KOUADIO for their help in taxonomic verifications of the biological material. Authors also express their gratitude to Dr. Olive Vivien NOAH EWOTI and Mr. Henry Bruno DOMCHE TEHAM for their help during the sampling campaigns.

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  1. Laboratory of Hydrobiology and Environment, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon

    Siméon Tchakonté, Gideon A. Ajeagah & Pierre Ngassam

  2. Laboratory of Environment and Aquatic Biology, Nangui Abrogoua University, 02 P.O. Box 801, Abidjan 02, Ivory Coast

    Siméon Tchakonté, Dramane Diomandé & Adama Idrissa Camara

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  1. Siméon Tchakonté
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  2. Gideon A. Ajeagah
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  4. Adama Idrissa Camara
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  5. Pierre Ngassam
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Correspondence to Siméon Tchakonté.

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Tchakonté, S., Ajeagah, G.A., Diomandé, D. et al. Diversity, dynamic and ecology of freshwater snails related to environmental factors in urban and suburban streams in Douala–Cameroon (Central Africa). Aquat Ecol 48, 379–395 (2014). https://doi.org/10.1007/s10452-014-9491-2

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