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Watershed, lake and food web factors influence diazotrophic cyanobacteria in mountain lakes (Dataset)
| Content Provider | Dryad |
|---|---|
| Author | Jansen, Lara Strecker, Angela Pan, Yangdong Sobota, Daniel |
| Abstract | Cyanobacterial blooms can occur in freshwater ecosystems largely isolated from development and not experiencing extensive cultural eutrophication. For example, remote mountain lakes can experience intense blooms of diazotrophic (nitrogen-fixing) cyanobacteria caused by factors acting at different spatial and temporal scales. In this study, we examined how cross-scale interactions among watershed, lake, and food web characteristics influence diazotrophic cyanobacteria biovolume in mountain lakes. We quantified diazotrophic cyanobacteria biovolume, zooplankton abundance, and physico-chemical variables for 29 lakes in the Cascade Mountains of Oregon, USA, in summer 2019. Watershed characteristics were compiled from historical data sets available for the region. Diazotrophic cyanobacteria biovolume ranged across the lakes from 0 to 1,930,000 µm3 mL-1; Dolichospermum was the most common genus. Random forest models showed that 11 watershed, lake, and food web characteristics explained 76% of the variance in diazotrophic cyanobacteria biovolume among the sampled lakes. Structural equation models suggested that the drainage ratio (i.e., relative area of the lake to the watershed) correlated positively with phosphorus concentrations and in turn, with diazotroph biovolume. Among lakes, hypolimnetic dissolved oxygen was negatively correlated with diazotroph biovolume, possibly due to the release of nutrients, like phosphate and iron, bound to sediments. In addition, zooplankton grazers were negatively related to diazotrophic cyanobacteria biovolume, potentially reflecting the influence of stocked fish. Thus, lake management must account for bottom-up factors, such as nutrient loading, which is influenced by lake morphometry and watershed size, as well as top-down factors, such as fish stocking, to effectively mitigate diazotrophic cyanobacterial blooms. |
| File Size | 34271 |
| File Format | HTM / HTML |
| ISSN | 00243590 |
| DOI | 10.5061/dryad.ffbg79czr |
| Alternate Webpage(s) | https://datadryad.org/stash/downloads/file_stream/2929096 |
| Alternate Webpage(s) | https://datadryad.org/stash/downloads/file_stream/2929094 |
| Alternate Webpage(s) | https://datadryad.org/stash/downloads/file_stream/2929092 |
| Alternate Webpage(s) | https://datadryad.org/stash/downloads/file_stream/2929103 |
| Language | English |
| Publisher Date | 2024-02-25 |
| Access Restriction | Open |
| Subject Keyword | Cyanobacterial Blooms Cross-scale Interactions Mountain Lakes Trophic Interactions |
| Content Type | Text |
| Resource Type | Data Set |
| Subject | Aquatic Science Oceanography |
