Did species and functional diversities of sandy intertidal marine nematodes reveal similar response to environmental changes?
Song, H.; Mu, F.; Sun, Y.; Hua, E. (2023). Did species and functional diversities of sandy intertidal marine nematodes reveal similar response to environmental changes? Journal of Ocean University of China 22: 527-540. https://dx.doi.org/10.1007/s11802-023-5256-7
In: Journal of Ocean University of China. Springer: Qingdao. ISSN 1672-5182; e-ISSN 1993-5021, more
|  |
| Keywords |
Nematoda [WoRMS]
Marine/Coastal; Brackish water |
| Author keywords |
marine nematode; species diversity; functional diversity; functional traits; sandy beaches |
| Authors | | Top |
- Song, H.
- Mu, F.
- Sun, Y.
- Hua, E.
|
|
|
| Abstract |
Free living marine nematodes were sampled from two sandy beaches in Dalian City, in December of 2015, and April, July, and October of 2016. The spatial and seasonal variations of marine nematode species diversity (based on species abundance dataset) and functional diversity (based on functional traits dataset: feeding types and life history strategies) were investigated to understand the environmental drivers and how they respond to specific environmental variations. Sediment granularity was revealed to be the main environmental factor causing spatial differences in nematode diversity indices between the two beaches. Species diversity indices, namely species number, Margalef index, Shannon-Wiener diversity index (H′), were higher in fine-grained sediments, while the functional diversity indices, including functional evenness, functional dispersion, and Rao’s quadratic entropy index (RaoQ), were higher in coarse-grained sediments. Nematode species diversity indices also fluctuated with seasonal variations of temperature, dissolved oxygen, pH, salinity, and sediment chlorophyll-a within the study beaches. However, functional diversity indices did not show significant seasonal variations and exhibited weak correlation with the studied environmental variables. Overall, the functional diversity indices were negatively correlated with the species diversity indices, suggesting an inconsistent response to environmental changes. A decrease in nematode species diversity in coarse sands, accompanied by an increase in functional diversity, can be regarded as an early warning signal of environment disturbance. If more biological traits are involved in calculating functional diversity indices, it will be helpful for the future study of the internal connections of species diversity and functional diversity. |
|
