Biodiversity and Abundance of Phytoplankton from Auranga Estuary, Valsad District, Gujarat, India

Year 2021, , 86 - 98, 29.12.2021

Shefali S. Patel , Susmita Sahoo

https://doi.org/10.46384/jmsf.944880

Cited By: 1

Abstract

This study describes phytoplankton abundance and diversity from site 1 (downstream) and site 2 (upstream) of Auranga Estuary (20˚63’ N and 72˚82’ E). A Total of 44 species of phytoplankton were recorded, 35 species from downstream and 24 species from upstream. The assessed abundance was 129 cells/mL and 86 cells/mL from the downstream and upstream, respectively. Bacillariophyceae (19) was the dominant group followed by Chlorophyceae (10), Cyanobacteria (07), Dinophyceae (07), and Chrysophyceae (01). Nitzschia, Coscinodiscus and Ceratium were abundant genera at site 1 and Spirogyra, Microcystis, Chlorella and Oscillatoria were abundant at site 2. Nitzschiaceae and Zygnemataceae had highest family contribution at the downstream and upstream, respectively. Members of Bacillariophyceae and Cyanobacteria were present in high numbers throughout the year. The abundance of Chlorophyceae did not fluctuate greatly. Chrysophyceae (Chromulina pascheri) was observed during the summer period. Spatially, downstream had higher species diversity and abundance than upstream whereas winter season was favorable for plankton growth compared to summer and monsoon. Species dominance (Site 1: 0.238; Site 2: 0.257) richness (Site 1: 1.13; Site 2: 1.36), evenness (Site 1: 0.88; Site 2: 0.79) and diversity were assessed using alpha biodiversity indices. The Shannon diversity index was 1.417 and 1.268 for downstream and upstream, respectively. It indicates less diversity level in this estuary.

Keywords

phytoplankton, diversity, distribution, seasonal variations, diversity indices

Thanks

The authors are very thankful to the boatmen for helping with the samplings.

Auranga Halici (Valsad Bölgesi, Gujarat, Hindistan)'nde Fitoplankton Biyoçeşitliliği ve Bolluğu

Abstract

Bu çalışma, Auranga Haliç'in (20˚63' N ve 72˚82' E) 1. bölge (akıntı altı) ve 2. bölge (akıntı üstü) alanlarında fitoplankton bolluğu ve çeşitliliğini açıklamaktadır. 35 tür akıntı altından ve 24 tür akıntı üstünden olmak üzere toplam 44 fitoplankton türü kaydedilmiştir. Fitoplankton bolluğu akıntı altı ve akıntı üstünden sırasıyla 129 hücre/mL ve 86 hücre/mL olarak belirlenmiştir. Bacillariophyceae (19) baskın grup olup, onu sırasıyla Chlorophyceae (10), Cyanobacteria (07), Dinophyceae (07) ve Chrysophyceae (01) izlemiştir. Nitzschia, Coscinodiscus ve Ceratium, 1. bölgede ve Spirogyra, Microcystis, Chlorella ve Oscillatoria, 2. bölgede bol miktarda bulunmuştur. Nitzschiaceae ve Zygnemataceae, sırasıyla akıntı altı ve akıntı üstü en yüksek familya katkısına sahipti. Bacillariophyceae ve Cyanobacteria üyeleri yıl boyunca çok sayıda mevcuttu. Chlorophyceae'nin bolluğu büyük ölçüde dalgalanma göstermedi. Chrysophyceae (Chromulina pascheri) yaz döneminde gözlenmiştir. Mekansal olarak, akıntı altı, akıntı üstünden daha fazla tür çeşitliliğine ve bolluğuna sahipken, kış mevsimi, yaz ve musonla karşılaştırıldığında türlerin büyümesi için elverişliydi. Tür baskınlığı (1. Bölge: 0.238; 2. Bölge: 0.257) zenginlik (1. Bölge: 1.13; 2. Bölge: 1.36), doğruluk (1. Bölge: 0.88; 2. Bölge: 0.79) ve çeşitlilik, alfa biyoçeşitlilik indeksleri kullanılarak değerlendirilmiştir. Shannon çeşitlilik indeksi, akıntı altı ve akıntı üstü için sırasıyla 1.417 ve 1.268 olarak belirlenmiştir. Bu, Haliç'te daha az çeşitlilik seviyesini göstermektedir.

Keywords

Fitoplankton, çeşitlilik, dağılım, mevsimsel değişimler, çeşitlilik indeksleri

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