Effects of meteorological forcing on coastal eutrophication: Modeling with model trees

Tamvakis, Αndroniki; Miritzis, John; Tsirtsis, George; Spyropoulou, Alexandra; Spatharis, Sofie

doi:10.1016/j.ecss.2012.09.003

Cited by 15 publications

(13 citation statements)

References 77 publications

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“…This is commonly observed in coastal ecosystems (e.g. Caraco 1988;Webb 1988; Moore et al 2013), with evidence from Chesapeake Bay (Fisher et al 1992), Baltic lagoons (Pilkaitytė and Razinkovas 2007), Mediterranean gulfs (Tamvakis et al 2012), the Pearl River estuary in Hong Kong (Yin 2002;Yin et al 2004), to name a few. This temporal switching in the limiting nutrient occurs because coastal ecosystems have multiple nutrient sources whose influence varies over the course of a year, where sources include terrestrial runoff (sometimes from multiple watersheds), groundwater inflows and oceanic mixing.…”

Section: Introductionmentioning

confidence: 83%

“…Transitions from limitation of one nutrient to another can be abrupt or gradual, and this mode of switching also influences phytoplankton succession, biodiversity and productivity (Roelke andSpatharis 2015a,b, Sakavara et al 2018). Abrupt transitions might occur in systems characterized by episodic rainfall events and associated runoff (Tamvakis et al 2012;Roelke et al 2013;Roy et al 2013;Morse et al 2014), or wind-driven vertical mixing events (Lares et al 2009;Hu et al 2011;Chen et al 2013). On the other hand, gradual transitions might occur in systems characterized by protracted wet seasons, by annually occurring periods of upwelling (Anabalón et al 2014;Zhou et al 2014), or by in-stream reservoirs that buffer the effect of episodic runoff (Magilligan and Nislow 2005;Poff et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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Species extinctions strengthen the relationship between biodiversity and resource use efficiency

Smeti

Roelke

Tsirtsis

et al. 2018

Ecological Modelling

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Evidence from terrestrial ecosystems indicates that biodiversity relates to ecosystem functions (BEF), but this relationship varies in its strength, in part, as a function of habitat connectivity and fragmentation. In primary producers, common proxies of ecosystem function include productivity and resource use efficiency. In aquatic primary producers, macroecological studies have observed BEF variance, where ecosystems with lower richness show stronger BEF relationships. However, aquatic ecosystems are less affected by habitat fragmentation than terrestrial systems and the mechanism underlying this BEF variance has been largely overlooked. Here, we provide a mechanistic explanation of BEF variance using a trait-based, numerical model parameterized for phytoplankton. Resource supply in our model fluctuates recurrently, similar to many coastal systems. Our findings show that following an extinction event, the BEF relationship can be driven by the species that are the most efficient resource users. Specifically, in species-rich assemblages, increased redundancy of efficient resource users minimizes the risk of losing function following an extinction event. On the other hand, in species-poor assemblages, low redundancy of efficient resource users increases the risk of losing ecosystem function following extinctions. Furthermore, we corroborate our findings with what has been observed from large-scale field studies on phytoplankton.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Species extinctions strengthen the relationship between biodiversity and resource use efficiency

Smeti

Roelke

Tsirtsis

et al. 2018

Ecological Modelling

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“…The fact that salinity and silicates were among the most important environmental drivers of assemblage composition appears to be inconsistent with localized coastal monitoring studies in which sampling within annual cycles reveal nitrogen and phosphorous as the main drivers of compositional turnover in temperate oligotrophic waters [57][58][59]. This apparent contradiction could be a result of spatial and temporal scales.…”

Section: Discussionmentioning

confidence: 88%

Everything is not everywhere: can marine compartments shape phytoplankton assemblages?

et al. 2019

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The idea that ‘everything is everywhere, but the environment selects' has been seminal in microbial biogeography, and marine phytoplankton is one of the prototypical groups used to illustrate this. The typical argument has been that phytoplankton is ubiquitous, but that distinct assemblages form under environmental selection. It is well established that phytoplankton assemblages vary considerably between coastal ecosystems. However, the relative roles of compartmentalization of regional seas and site-specific environmental conditions in shaping assemblage structures have not been specifically examined. We collected data from coastal embayments that fall within two different water compartments within the same regional sea and are characterized by highly localized environmental pressures. We used principal coordinates of neighbour matrices (PCNM) and asymmetric eigenvector maps (AEM) models to partition the effects that spatial structures, environmental conditions and their overlap had on the variation in assemblage composition. Our models explained a high percentage of variation in assemblage composition (59–65%) and showed that spatial structure consistent with marine compartmentalization played a more important role than local environmental conditions. At least during the study period, surface currents connecting sites within the two compartments failed to generate sufficient dispersal to offset the impact of differences due to compartmentalization. In other words, our findings suggest that, even for a prototypical cosmopolitan group, everything is not everywhere.

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“…We focus on these two important nutrients for algal growth as they are associated with freshwater inflows and HAB phenomena in coastal environments, where nitrogen and phosphorus limitation alternate within the course of a year (Tamvakis et al, 2012). To determine the species growth kinetic parameters, we used both batch and continuous monocultures.…”

Section: Introductionmentioning

confidence: 99%

Potential mechanisms of coexistence between two globally important Pseudo-nitzschia (Bacillariophyta) species

et al. 2015

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To understand the mechanisms leading to coexistence and exclusion, it is essential to establish information on the nutritional needs of species. We focused on the frequently coexisting Pseudo-nitzschia species, P. delicatissima and P. galaxiae, capable of forming blooms and producing domoic acid. We employed monoculture experiments to determine growth kinetic parameters important for understanding resource use (i.e. maximum specific growth rate, half-saturation coefficients for growth and cell quotas), and we coupled mixed-culture experiments and numerical modelling to explore the role of resource competition relative to unknown factors, such as allelopathy. Experimental results showed that both species had a high requirement for nitrogen (N) and low requirement for phosphorus (P), consistent with field observations of Pseudo-nitzschia blooms in N-rich conditions. The model accurately predicted the outcome of competition; P. galaxiae outcompeted P. delicatissima when considering only resource competition, but the population trajectories were better predicted when allelopathic effects were added. Since the competitive exclusion of P. delicatissima by P. galaxiae in our laboratory experiments is not consistent with observations of coexistence in the natural environment, the model was further modified to explore realistic ranges of population loss factors, such as sinking, demonstrating how coexistence is possible when these are considered.

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Effects of meteorological forcing on coastal eutrophication: Modeling with model trees

Cited by 15 publications

References 77 publications

Species extinctions strengthen the relationship between biodiversity and resource use efficiency

Species extinctions strengthen the relationship between biodiversity and resource use efficiency

Everything is not everywhere: can marine compartments shape phytoplankton assemblages?

Potential mechanisms of coexistence between two globally important Pseudo-nitzschia (Bacillariophyta) species

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