Landscape Disturbance and Biodiversity in Mediterranean-Type Ecosystems

2016 ◽  
Author(s):  
Joshua Szall ◽  
◽  
Eric C. Straffin ◽  
Brian S. Zimmerman

Author(s):  
Karen J. Esler ◽  
Anna L. Jacobsen ◽  
R. Brandon Pratt

Ecosystems are assemblages of organisms interacting with one another and their environment (Chapter 1). Key to the functioning of ecosystems is the flow of energy, carbon, mineral nutrients, and water in these systems. The numerous processes involved are chiefly driven by climate, soil, and fire (Chapter 2). In cases where the key drivers are the same in different areas, then ecosystems should converge in their structure and function, which has been a motivation for comparing across mediterranean-type climate (MTC) regions. Convergence of MTC regions has been evaluated, but such comparisons at the ecosystem level are challenging because ecosystems are complex and dynamic entities. Here we review carbon, nutrient, and water dynamics of mediterranean-type ecosystems in the context of ecosystem function. As nutrients in soils are low in some MTC regions, we review how this has led to unique adaptations to meet this challenge.


Author(s):  
Karen J. Esler ◽  
Anna L. Jacobsen ◽  
R. Brandon Pratt

Modern mediterranean-type ecosystems (MTEs) are shaped by key ecosystem drivers that affect their function. The most important of these drivers are climate, topography, soils, and fire. There are important geographical, climatic, and fire histories that are crucial to understanding these systems. Mediterranean-type climate (MTC) is defined as a cool wet winter (winter-wet) and a warm dry summer, which is a unique pattern of seasonality and one that is rare globally. All of the MTC regions have nutrient-poor soils, particularly as related to nitrogen (N), and some also have extensive phosphorus-poor soils. There is considerable variation both within and between regions in their degree of nutrient impoverishment of soils. Through these shared ecosystem drivers, selection has operated within each ecosystem to shape the communities and the organisms within them. This has resulted in the communities and organisms displaying similar structures and processes.


Author(s):  
Karen J. Esler ◽  
Anna L. Jacobsen ◽  
R. Brandon Pratt

The world’s mediterranean-type climate regions (including areas within the Mediterranean, South Africa, Australia, California, and Chile) have long been of interest to biologists by virtue of their extraordinary biodiversity and the appearance of evolutionary convergence between these disparate regions. Comparisons between mediterranean-type climate regions have provided important insights into questions at the cutting edge of ecological, ecophysiological and evolutionary research. These regions, dominated by evergreen shrubland communities, contain many rare and endemic species. Their mild climate makes them appealing places to live and visit and this has resulted in numerous threats to the species and communities that occupy them. Threats include a wide range of factors such as habitat loss due to development and agriculture, disturbance, invasive species, and climate change. As a result, they continue to attract far more attention than their limited geographic area might suggest. This book provides a concise but comprehensive introduction to mediterranean-type ecosystems. As with other books in the Biology of Habitats Series, the emphasis in this book is on the organisms that dominate these regions although their management, conservation, and restoration are also considered.


2021 ◽  
Author(s):  
Víctor Hugo Mendoza-Sáenz ◽  
Darío Alejandro Navarrete-Gutiérrez ◽  
Guillermo Jiménez-Ferrer ◽  
Cristian Kraker-Castañeda ◽  
Romeo A. Saldaña-Vázquez

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