Climate change and the spring bloom: a mesocosm study on the influence of light and temperature on phytoplankton and mesozooplankton
نویسندگان
چکیده
We examined the simultaneous effect of climate warming and light availability on the phytoplankton spring bloom using 1400 l (1 m depth) indoor mesocosms. The timing of the spring bloom was advanced both by warming and higher light intensity, but the influence of temperature on the phytoplankton community was stronger than the light effect. Warming affected phytoplankton directly and indirectly via enhanced grazing pressure at higher temperatures. Warming resulted in markedly lower phytoplankton biomass and a shift towards smaller cell sizes. It also led to changes in the community structure of phytoplankton and zooplankton. Among phytoplankton, large-celled diatoms were most negatively affected by warming. Overwintering zooplankton species (Oithona, Pseudocalanus) remained dominant in the cold treatments, while they were replaced by late spring or summer species (Acartia, Centropages, Temora) in the warmed treatments. Our results show that understanding food web interactions might be very important to the study of the effects of climate warming on pelagic ecosystems.
منابع مشابه
The Baltic Sea spring phytoplankton bloom in a changing climate: an experimental approach
The response of the Baltic Sea spring bloom was studied in mesocosm experiments, where temperatures were elevated up to 6 C above the present-day sea surface temperature of the spring bloom season. Four of the seven experiments were carried out at different light levels (32–202 Wh m at the start of the experiments) in the different experimental years. In one further experiment, the factors ligh...
متن کاملMechanistic origins of variability in phytoplankton dynamics. Part II: analysis of mesocosm blooms under climate change scenarios
Driving factors of phytoplankton spring blooms have been discussed since long, but rarely analyzed quantitatively. Here, we use a mechanistic size-based ecosystem model to reconstruct observations made during the Kiel mesocosm experiments (2005–2006). The model accurately hindcasts highly variable bloom developments including community shifts in cell size. Under low light, phytoplankton dynamic...
متن کاملSpring phenological responses of marine and freshwater plankton to changing temperature and light conditions
Shifts in the timing and magnitude of the spring plankton bloom in response to climate change have been observed across a wide range of aquatic systems. We used meta-analysis to investigate phenological responses of marine and freshwater plankton communities in mesocosms subjected to experimental manipulations of temperature and light intensity. Systems differed with respect to the dominant mes...
متن کاملBiotic interactions may overrule direct climate effects on spring phytoplankton dynamics
To improve our mechanistic understanding and predictive capacities with respect to climate change effects on the spring phytoplankton bloom in temperate marine systems, we used a process-driven dynamical model to disentangle the impact of potentially relevant factors which are often correlated in the field. The model was based on comprehensive indoor mesocosm experiments run at four temperature...
متن کاملPhysico-biological modeling of seasonal changes of plankton community in south of Hormoz strait
Planktons are floating microscopic organisms that are confirmed as the primary producers and initial transporters of carbon to the higher levels of food webs. Moreover, planktons have an special importance and status in the habitat of aquatic ecosystems and therefore, their population dynamic assessment is essential in the study of these ecosystems. An extensive range of physical factors viz. n...
متن کامل