Abstract
Ecosystems worldwide are experiencing the effects of climate change, and estuaries and salt marshes are no exception. The plant community will be one of the most affected elements by these climatic shifts, both in terms of structure and dynamics, with undeniable effects on its productivity. This thesis aims to study the effects of climate change on the marsh community dynamics, structure and productivity but also on its biogeochemical cycles and implications at the ecosystem level. Although special attention was given to primary productivity and plant physiology, a multidisciplinary approach was undertaken using both field assessments and mesocosmos trials. The results point out that these physically connected climatic changes are not only interconnected in a physical way but also at an ecological level. Mediterranean marshes will be more severely affected on their foundations, putting the entire ecosystem at risk and prone to climate change side effects and/or to synergistic events. The majority of the evaluated climatic changes have more negative impacts on the marsh pioneer species, affecting inevitably marsh establishment and expansion. Although to a lesser extent, the upper and middle marsh halophytes will also suffer from these climate-driven negative impacts. In addition, the appearance of resistant nonindigenous species (NIS) will add an increased threat to the marsh. The reduction of the pioneer zone in a large extension together with a middle marsh fragilization will open new ecological niches for the colonization of resistant NIS, imposing serious shifts in the marsh structure, dynamics and services provided to the estuarine ecosystem. This is even more evident when a holistic approach is undertaken focusing not only on plant physiology but also the marsh biogeochemistry and estuarine hydrological features. These evidences point out the need to adopt new management efforts, highlighting the desired marsh attributes and ecosystem services in the face of human activities that threaten salt marsh ecosystems.
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Caçador, I., Duarte, B., Marques, J.C. (2019). Climate Change Impacts on Salt Marsh Vegetation Ecophysiology. In: Gul, B., Böer, B., Khan, M., Clüsener-Godt, M., Hameed, A. (eds) Sabkha Ecosystems. Tasks for Vegetation Science, vol 49. Springer, Cham. https://doi.org/10.1007/978-3-030-04417-6_12
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