Study the diversity and seasonal variations of endangered fishes, plankton and benthos in Kanchan river of Dinajpur
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Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This research work was carried out from February to June, 2018 to monitor the present status of endangeredfishes, productivity and overall health status of Kanchan river situated in Dinajpur district. Water and sediment sampleswere collected twice in a month during the study period from the selected five different sampling sites along with requiredinformation about the availability of threatened fishes. The findings noted over 28 available threatened fish species inKanchan river including several commonly available threatened fishes (Endangered: Acanthocobitisbotia,Somileptesgongota, Botiadario, Botialohachata, Bariliustileo, Barilusbengalensisetc.; Critically endangered:Channabarca, Labeonandina, Clupisomagaruaetc.) which are very rear in nationwide. Common planktonic flora andfauna of this riverine ecosystem were also identified. In the river several phytoplankton (Asterionella sp., Tabellaria sp.,Clostridium sp. etc.) and zooplankton (Brachionus sp.) were monitored as season specific. Abundance of plankton wereanalyzed statistically significant (p <0.05) in different seasons. Plankton counting detected comparatively lower (23,000per liter) and higher (39,000 per liter) numbers in the month of February and June, respectively. The observed benthicfauna of Kanchan river possessed 22 species of macro-benthos from different groups. Monitored minimum temperature(21.5 oC) was recorded in the month of February and it was maximum in the month of June (30.5 oC). These resultssuggested that productivity indicators (availability of planktonic flora and fauna including benthos) were better in theearly monsoon season than the pre-monsoon season. Similarly, better ecosystem health (temperature, dissolve oxygenand availability of plankton) was also observed in early monsoon season. Seasonal variations of water temperature anddissolved oxygen were visualized significant (p <0.05). Finally, this study findings recommended to stop all manmadeinterventions for the better health of this riverine ecosystem as well as to take necessary actions for conserving thecommonly available endangered and critically endangered fishes of Kanchan river.
Açıklama
Anahtar Kelimeler
Kaynak
Biological Diversity and Conservation
WoS Q Değeri
Scopus Q Değeri
Cilt
12
Sayı
1
