Wildland fires are one of the more severe disturbances for natural ecosystems in the Mediterranean basin and can become a critical factor in the process of soil erosion. A quantitative assessment of soil erosion is needed in order to form an assessment on the extent and magnitude of post-fire soil erosion potential and to assess the effectiveness of the rehabilitation treatment. On 21 August 2006, a large wildland fire occurred in the Kassandra Peninsula in northern Greece, which burned one fifth of the Peninsula. After the fire, in order to protect the soil against erosion, the Forest Services applied a hillslope rehabilitation treatment of contour-felled logs and branch piles. In this paper, we report quantitative estimation of the wildland fire and erosion control treatment on soil erosion potential. The coupling of the Universal Soil Loss Equation and the Geographical Information Systems was implemented and the erosion potential was found to be 2.8 t/ha/year pre-fire, 29.5 t/ha/year post-fire, and 21.3 t/ha/year after rehabilitation treatment. The model can successfully contribute in the planning of the rehabilitation treatment but it cannot be used in the quantification of the soil loss after the application of the erosion control measures. The comparisons between the results of the three cases indicate the importance of the immediate erosion control measures in order to mitigate soil loss and restore the natural environment.

Riparian areas are unique and of high importance ecosystems because they are adjacent to surface freshwater bodies such as streams, rivers and lakes. They are the semi-aquatic transitional zones (ecotones) between terrestrial and aquatic ecosystems. Water, soil and vegetation are the three main characteristics that differentiate them compared to other ecosystems. Furthermore, they are present in all biomes (from deserts to tropical forests) and are found in a great range of hydrologic and geomorphologic conditions that results in a great variety of riparian habitat types. In Greece, there are five major riparian forest habitat types that also occur in most of the semi-arid Mediterranean regions. Frequent disturbance is another unique characteristic that differentiates riparian areas. The major disturbances that shape riparian areas in Greece are unpredicted flood and drought events, as well as fires but to a lesser degree. Wetlands are another important semi-aquatic ecosystems that many consider as synonymous to riparian areas. In reality, these two ecosystems overlap but they are also different since wetlands are considered as "wetter" and less disturbance driven than riparian areas.

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PurposeThe purpose of this paper is to review the federal decisions to coronavirus disease 2019 (COVID-19) response in the United States and consider the different approaches employed by the California state government.Design/methodology/approachThis paper focuses on COVID-19-related issues, responses and implications in federal countries, and largely draws comparisons between the Trump Administration and California state.FindingsThe slow response of the federal government could have been avoided, had there been a current and tested national plan. The defunding of the Office of Pandemics and Emerging Threats, and the lack of coordination between the Trump Administration and the states have contributed to its ranking as the country with the highest COVID-19 infection and fatality rates worldwide. California state oversaw an effective initial pandemic response, which was ultimately undermined by a lack of national support and the refusal of some citizens to comply with the restrictions.Research limitations/implicationsThe paper draws upon open-source information published on government websites and news media.Originality/valueAs the COVID-19 pandemic in the United States is currently ongoing, information about the federal governance and state response is still evolving. The authors examine California as a state exemplar, since it is the largest such jurisdiction by populace and the first state to issue statewide mandatory lockdown measures. This comparison offers insights as to the decisive initiatives that could have occurred at the federal level. The “lessons learned” highlight the critical role of crisis leadership in societal and public health preparedness for future pandemic events.

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