Jaime Pereña - Academia.edu (original) (raw)

Papers by Jaime Pereña

Research paper thumbnail of Modelo de evaluación de la efectividad, continuidad y conectividad del sistema de áreas protegidas costeras mediante el análisis de su flora y vegetación

The coastal environments of Andalusia have been subjected to strong pressures of anthropic origin... more The coastal environments of Andalusia have been subjected to strong pressures of anthropic origin: tourism, urbanizations, recreational activities, invasions of alien species , etc., which have fragmented and altered, in the last 60 years, their structure, composition and functionality from a phytocenological point of view, which implies a threat to the conservation status of Natural habitats of Community interest, endangered species and, in sum, of plant biodiversity. From the study of 14 coastal protected areas (PAs), different conservation and anthropic interaction analyzes have been performed and, finally, the consistency of the nodes and the integral degree of effectiveness of the network have been estimated. It is observed that the intense artificialization of the Andalusian coast has produced a fragmentation of habitats and a loss of connectivity between focal habitats in coastal PAs, being especially important between the Mediterranean and Atlantic PAs blocks, separated by t...

Research paper thumbnail of The conquest of the dark spaces: An experimental approach to lighting systems in Paleolithic caves

PLOS ONE, 2021

Artificial lighting was a crucial physical resource for expanding complex social and economic beh... more Artificial lighting was a crucial physical resource for expanding complex social and economic behavior in Paleolithic groups. Furthermore, the control of fire allowed the development of the first symbolic behavior in deep caves, around 176 ky BP. These activities would increase during the Upper Paleolithic, when lighting residues proliferated at these sites. The physical peculiarities of Paleolithic lighting resources are very poorly understood, although this is a key aspect for the study of human activity within caves and other dark contexts. In this work, we characterize the main Paleolithic lighting systems (e.g., wooden torches, portable fat lamps, and fireplaces) through empirical observations and experimental archeology in an endokarstic context. Furthermore, each lighting system’s characteristic combustion residues were identified to achieve a better identification for the archaeological record. The experiments are based on an exhaustive review of archaeological information a...

Research paper thumbnail of Modelo de evaluación de la efectividad, continuidad y conectividad del sistema de áreas protegidas costeras mediante el análisis de su flora y vegetación

Botánica complutensis, 2020

Coastal ecosystems are strongly threatened by rising sea levels, flooding and coastalization of t... more Coastal ecosystems are strongly threatened by rising sea levels, flooding and coastalization of the population. Although the increasing effort to protect coastal areas, these are fragmented into tesserae surrounded by artificialized territories. Connectivity between these protected areas is the guarantee of the continuity of the ecosystem services they provide. We proposed a model for the evaluation of the potential effectiveness of the continuous system of coastal protected areas based on knowledge of their flora and vegetation. The degree of effectiveness is intended as an indicator for the adoption of spatial planning measures leading to the strengthening of the network as a measure to safeguard biodiversity. To test the proposed model, the coast of Andalusia (S of Spain) was chosen, a territory bathed by the Mediterranean and the Atlantic, which is susceptible to significant impacts. This coast has been subjected, during the last 60 years, to strong anthropic pressure that have fragmented and altered the structure, composition and functionality of the coastal ecosystems. These impacts threaten the standards in which the protected areas were declared, also jeopardize the connectivity between ecosystems. Consequently, this pressure has negative effects in the ecosystem services development. The methodology we proposed to measure the potential effectiveness of the system is based on the degree of legal protection, the phytogenic value and the degree of artificialisation. Based on the integration of the values obtained, the consistency of the nodes had been calculated and, in short, the effectiveness of the network. The application of this approach highlights which protected areas are most vulnerable to network deficiencies, especially due to connectivity difficulties.

Research paper thumbnail of Modelo de evaluación de la efectividad, continuidad y conectividad del sistema de áreas protegidas costeras mediante el análisis de su flora y vegetación

The coastal environments of Andalusia have been subjected to strong pressures of anthropic origin... more The coastal environments of Andalusia have been subjected to strong pressures of anthropic origin: tourism, urbanizations, recreational activities, invasions of alien species , etc., which have fragmented and altered, in the last 60 years, their structure, composition and functionality from a phytocenological point of view, which implies a threat to the conservation status of Natural habitats of Community interest, endangered species and, in sum, of plant biodiversity. From the study of 14 coastal protected areas (PAs), different conservation and anthropic interaction analyzes have been performed and, finally, the consistency of the nodes and the integral degree of effectiveness of the network have been estimated. It is observed that the intense artificialization of the Andalusian coast has produced a fragmentation of habitats and a loss of connectivity between focal habitats in coastal PAs, being especially important between the Mediterranean and Atlantic PAs blocks, separated by t...

Research paper thumbnail of The conquest of the dark spaces: An experimental approach to lighting systems in Paleolithic caves

PLOS ONE, 2021

Artificial lighting was a crucial physical resource for expanding complex social and economic beh... more Artificial lighting was a crucial physical resource for expanding complex social and economic behavior in Paleolithic groups. Furthermore, the control of fire allowed the development of the first symbolic behavior in deep caves, around 176 ky BP. These activities would increase during the Upper Paleolithic, when lighting residues proliferated at these sites. The physical peculiarities of Paleolithic lighting resources are very poorly understood, although this is a key aspect for the study of human activity within caves and other dark contexts. In this work, we characterize the main Paleolithic lighting systems (e.g., wooden torches, portable fat lamps, and fireplaces) through empirical observations and experimental archeology in an endokarstic context. Furthermore, each lighting system’s characteristic combustion residues were identified to achieve a better identification for the archaeological record. The experiments are based on an exhaustive review of archaeological information a...

Research paper thumbnail of Modelo de evaluación de la efectividad, continuidad y conectividad del sistema de áreas protegidas costeras mediante el análisis de su flora y vegetación

Botánica complutensis, 2020

Coastal ecosystems are strongly threatened by rising sea levels, flooding and coastalization of t... more Coastal ecosystems are strongly threatened by rising sea levels, flooding and coastalization of the population. Although the increasing effort to protect coastal areas, these are fragmented into tesserae surrounded by artificialized territories. Connectivity between these protected areas is the guarantee of the continuity of the ecosystem services they provide. We proposed a model for the evaluation of the potential effectiveness of the continuous system of coastal protected areas based on knowledge of their flora and vegetation. The degree of effectiveness is intended as an indicator for the adoption of spatial planning measures leading to the strengthening of the network as a measure to safeguard biodiversity. To test the proposed model, the coast of Andalusia (S of Spain) was chosen, a territory bathed by the Mediterranean and the Atlantic, which is susceptible to significant impacts. This coast has been subjected, during the last 60 years, to strong anthropic pressure that have fragmented and altered the structure, composition and functionality of the coastal ecosystems. These impacts threaten the standards in which the protected areas were declared, also jeopardize the connectivity between ecosystems. Consequently, this pressure has negative effects in the ecosystem services development. The methodology we proposed to measure the potential effectiveness of the system is based on the degree of legal protection, the phytogenic value and the degree of artificialisation. Based on the integration of the values obtained, the consistency of the nodes had been calculated and, in short, the effectiveness of the network. The application of this approach highlights which protected areas are most vulnerable to network deficiencies, especially due to connectivity difficulties.