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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

ocean colour --- Essential Climate Variables --- primary production --- Carbon --- phytoplankton types

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EUN Northern Europe --- Northern Europe --- South Sweden --- biomass --- ecology --- primary production --- woodlands

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In the context of global climate change, extreme weather events are expected to intensify, threatening agricultural systems. Meanwhile, food demand is likely to grow due to increas-
ing human population. Accordingly, being able to assess and predict dynamic behaviours of
crops under changing climatic conditions is crucial to ensure food security. For that purpose,
photosynthesis is the key process to characterise. According to the literature, sun-induced flu-
orescence (SIF) represents a potential indicator of photosynthesis. Recently, the mechanistic
light response model (MLR) estimating gross primary production (GPP) from SIF has been
established. Firstly, this study aims to assess the relationship between SIF and GPP from the
MLR model perspective for a winter wheat canopy in Belgium. Secondly, the dynamics of the
main model parameters depending on environmental conditions have been studied. Continuous
measurements of micro-meteorological, flux and SIF data have been carried out for five months
by an ICOS station. Moreover, leaf-level gas exchange and fluorescence parameters have been
measured manually using a portable photosynthesis system. Similar temporal evolutions of SIF
and GPP in response to light have been observed, supporting the use of SIF as an indicator
of photosynthesis. The model provides a relatively moderate performance at half-hourly scale
which improved at daily scale. In particular, the model seems to correctly reproduce the SIF-
GPP relationship only under low light intensities and high soil moisture which is in agreement
with the main model assumption. Overall, these results point out the need for more accurate
characterization of the model underlying processes and parameters dynamics regarding envi- ronmental conditions.

Photosynthesis --- Sun-Induced Fluorescence --- Gross Primary Production --- Winter Wheat --- Edaphic Drought --- Sciences du vivant > Sciences de l'environnement & écologie

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The book Rivers of Portugal: Communities, Processes and Alterations appears in a context in which it is recognized the great importance of rivers for the society and in which there is an intense scientific and technical development on the aquatic ecosystems in Portugal. In 17 chapters written by Portuguese researchers, it was intended to cover the various areas of research linked to rivers. Thus, this book begins with the fundamental physical aspects of rivers: hydrology and sedimentology. Eight chapters follow devoted to aquatic organisms: algae, fungi and bacteria, aquatic and riverine vegetation, invertebrates, fish, amphibians and reptiles, mammals, and birds. The following chapters address human activities that cause major changes in ecosystem quality, ecological monitoring, and restoration of degraded river sectors. The last chapters deal with the last section of a river, before the see, the estuaries, and the final one the thermo-mineral springs, environments closely linked to water courses.

Hydrology --- Bacteria --- Reptiles --- Secondary production --- Bioassessment --- Algae --- Rivers --- Birds --- Corse --- Fishes --- Primary production --- Mammals --- Fungi --- Aquatic organisms --- Plants --- Invertebrates --- Sediments --- Environmental alterations --- Amphibians --- Leaf litter decomposition

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Biological techniques --- Plant ecology. Plant sociology --- Hydrobiology --- Aquatic plants --- Aquatic ecology --- Marine Biology --- Plankton --- Laboratory manuals --- Marine biology. --- Plankton. --- Laboratory manuals. --- ECO Ecology --- Algae --- aquatic --- aquatic plants --- cultivation --- ecology --- marine --- methods --- primary production --- Marine Biology.