Direct and context‐dependent effects of light, temperature, and phytoplankton shape bacterial community composition
| Autor: | Angela D. Kent, Sara F. Paver |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine 2. Zero hunger Ecology Environmental change 010604 marine biology & hydrobiology fungi Community structure Context (language use) Bacterioplankton 15. Life on land Plankton 010603 evolutionary biology 01 natural sciences Light effect Aquatic organisms 03 medical and health sciences 030104 developmental biology Community composition 13. Climate action Phytoplankton Environmental science Microcosm Ecology Evolution Behavior and Systematics |
| Zdroj: | Ecosphere. 8 |
| ISSN: | 2150-8925 |
| Popis: | Species interactions, environmental conditions, and stochastic processes work in concert to bring about changes in community structure. However, the relative importance of specific factors and how their combined influence affects community composition remain largely unclear. We conducted a multi-factorial experiment to 1) disentangle the direct and interaction-mediated effects of environmental conditions and 2) augment our understanding of how environmental context modulates species interactions. We focus on a planktonic system where interactions with phytoplankton effect changes in the composition of bacterial communities, and light and temperature conditions can influence bacteria directly as well as through their interactions with phytoplankton. Epilimnetic bacteria from two humic lakes were combined with phytoplankton assemblages from each lake (“home” or “away”) or a no-phytoplankton control and incubated for 5 days under all combinations of light (surface, ∼25% surface irradiance) and temperature (5 levels from 10°C to 25°C). Observed light effects were primarily direct while phytoplankton and temperature effects on bacterial community composition were highly interdependent. The influence of temperature on aquatic bacteria was consistently mediated by phytoplankton and most pronounced for bacteria incubated with “away” phytoplankton treatments, likely due to the availability of novel phytoplankton-derived resources. The effects of phytoplankton on bacterial community composition were generally increased at higher temperatures. Incorporating mechanisms underlying the observed interdependent effects of species interactions and environmental conditions into modeling frameworks may improve our ability to forecast ecological responses to environmental change. |
| Databáze: | OpenAIRE |
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