Study of ecological and environmental conditions of Talar river using epilithic and epipylic diatoms
University of Mazandaran , n.jafari@umz.ac.ir
Abstract: (273 Views)
This study aimed to assess the ecological and environmental conditions of the Talar River using epilithic and epipelic diatoms. Sampling was conducted seasonally from summer 2023 to spring 2024 at three selected stations. Simultaneous with diatom sampling, one-liter water samples were collected to measure physical and chemical parameters. Diatom samples were prepared and identified based on standard protocols. In total, 84 species from 24 genera were identified. The most diverse genera were Navicula, Nitzschia, and Gomphonema. Navicula cryptotenella had the highest cell abundance, followed by Nitzschia palea and Navicula rhynchocephala. Diversity indices such as Shannon, Simpson, and species evenness showed no significant spatial difference. The results of the Canonical Correspondence Analysis (CCA) between environmental variables and epilithic species showed that the first and second axes explained 41.09 and 14.81% of the total variance, respectively, accounting for 55.9% of the constrained variance. For epipelic species, the first and second axes explained 37.37 and 14.40% of the total variance, respectively, and together accounted for 51.77% of the constrained variance. Moreover, the analysis revealed a strong correlation between environmental variables (especially pH and phosphate) and diatom community structure in both habitats, underscoring the role of environmental factors in shaping their distribution patterns.
Type of Study: Original Article |
Subject:
Ecology
Received: 2024/10/29 | Revised: 2025/09/15 | Accepted: 2025/08/19
Received: 2024/10/29 | Revised: 2025/09/15 | Accepted: 2025/08/19
Send email to the article author
| Rights and permissions | |
 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
© 2025 CC BY-NC 4.0 | Nova Biologica Reperta
Designed & Developed by : Yektaweb