Coastal and estuarine margins are considered natural resources with various functions and are covered by different management and protection tools. In Portugal, the Maritime Public Domain (MPD) aims to regulate property in maritime and coastal areas, assuming that these are public resources of the nation. Little is known, however, about how the MPD considers estuarine margins, which are also valuable, and vulnerable, environmental areas. This article analyses how the concept of MPD applies to the estuarine margins in Portugal. Moreover, as this concept has been subsequently adopted by other countries with close roots such as Angola, Brazil, and Mozambique, this paper also explores if estuaries are further considered in their legislation. For this purpose, it undertakes an analysis of legal documents establishing the MPD, focusing on the definition, types of areas where it applies, the width of the margins, ownership, and use restriction. The findings show that estuaries are considered by the MPD in Portugal and in the similar instruments of the other three countries. Nevertheless, their approaches differ, especially on the width of margins and the flexibility of the ownership regime, suggesting that the potential to protect margins has not been globally reinforced by the countries adopting MPD after Portugal. This study offers new insights on the MPD and brings to the fore a gap in the literature that deserves to be further explored in other countries with different legal traditions and deepening the analysis on the added value for the protection of estuarine margins.

AIM: To validate the reaching speed during attention and memory tasks as a functional indicator in the geriatric population.METHODS: Institutionalized elderly living in 4 Portuguese institutions were characterized by their functional profile, with the following variables: (i) cognition; (ii) independence in basic daily living activities; (iii) independence in instrumental activities of daily living; (iii) grip strength, (iv) diagnosis of depression; (v) upper limb sensorimotor function; (vi) executive functions. All these instruments underwent a linking process with the International Classification of Functioning and Health. The sample was divided into four functional groups considering the values below and above the mean range of reaching speed in attention tasks (Group 1 - G1, Group 2 - G2) and the range of RS in memory tasks (Group 3 - G3, Group 4 - G4). Characterization of the sample groups was performed using descriptive statistical measures of the ICFqualifiers and the difference between groups (G1 / G2 and G3 / G4) was tested using t-tests for independent samples.RESULTS: The results showed significant differences between low- and high profile groups in RS tasks (p <0.05), identifying the following priority intervention areas in institutionalized elderly: d6. Domestic life, d1. Learning and knowledge application, d4. Mobility, d5. Self-care and d8. Significant areas of life. Older adults with reaching speed in attention tasks <0.06m/s or <0.07m/s in memory tasks tend to have moderate to severe disability in Mobility and Self Care and severe/complete inability to participate in Household tasks.CONCLUSION: This study was an important contribution to the validation of reaching speed (a test for upper limb function) during attention and memory tasks as a functional indicator, enabling elderly functional evaluation in a large spectrum, including non-ambulate elderly people.