IMPACTS CAUSED BY HUMAN ACTIVITY
Agriculture and use of fertilisers and pesticides: the village of Padul has always been mainly agricultural and livestock farming, especially with the cultivation of olive trees and vineyards. Nowadays a mosaic of crops predominates, combining dry and irrigated farming. The draining of the wetland was initiated for two main reasons: to eradicate malaria and to put it under cultivation (beet, cereals, tobacco and vegetable fields of no more than 10 hectares). However, this activity has been reduced in the area since the beginning of the 20th century due to urbanisation. Excessive use of fertilisers can lead to soil salinisation, which makes it more difficult for plants to grow and develop properly. Excess nutrients in the water, as a result of fertiliser use, can lead to eutrophication, which is the overgrowth of algae and aquatic plants. This results in oxygen depletion in the water and the death of aquatic animals.
The abundance of uncontrolled water extraction wells that could lower the water table with harmful consequences for the ecosystem.
It is surrounded by agricultural areas, some of which practically border the wetland.
In addition to crops, there are farmhouses with machinery that generate noise.
Infrastructures and urban area: the wetland receives wastewater from the village of Padul, and discharges from agricultural leachate and livestock slurry. The population of the village of Padul is on the increase, both due to population growth and the rise in popularity of second homes in Spain. There are various infrastructures for public use, promoted by the Town Council of Padul, together with the Regional Ministry of the Environment ("Consejería de Medio Ambiente", Junta de Andalucía). Most of them are related to the exploitation of the area (access roads, wetland drainage channels). The construction of infrastructures can fragment the wetland landscape, which has negative effects on animal mobility and seed dispersal. It can also lead to soil and water pollution due to the use of construction materials and waste disposal.
A few metres from the lagoon there is a regional road, which generates noise pollution and chemical pollution from the leachates of the asphalt, where dangerous pollutants are generated.
Constructions: farmhouses, restaurants, landscape impacts.
To the agricultural impacts that we can see in this panoramic photograph we add the wind turbines, which, in addition to having a landscape impact, cause bird deaths.
Impact of mining and quarrying: Peat exploitation (mining) rights are still in place, putting the area at risk. Mining and quarrying activities can contaminate groundwater and surface water sources in the wetland. Chemicals used in mining and quarrying, as well as waste generated, infiltrate groundwater aquifers and contaminate water sources. Both groups of lagoons in the area's lagoon system (the Agia lagoons and ponds and the Laguna Grande del Padul) have ditches leading from them, which distribute the water that emerges from within the earth to fill and drain the million-year-old lakes, which in Padul are called "madres", as they not only serve to transport and drain the water, but are also the source of the ecosystems and biodiversity of the area. There are currently two peat exploitations: the Turbera del Agia and the Turbera del Aguadero, mainly for the improvement of agricultural soils and for domestic gardening. In addition to the above, this can contribute to soil erosion in the wetland, which has a negative impact on soil quality and the capacity of the wetland to retain water.
Next to the lagoon we find this mine, which alters the landscape and generates dust and noise.
Noise pollution: 'Noise pollution is understood to be the presence in the environment of noise or vibrations, whatever the acoustic emitter that originates them, that imply a nuisance, risk or damage to people, to the development of their activities or to goods of any nature, or that cause significant effects on the environment'. Website of the Third Vice-Presidency of the Government, Ministry for Ecological Transition and the Demographic Challenge ("Ministerio para la Transición Ecológica y el Reto Demográfico"). Very close to the area of the lagoons and the wetland, we find the road. The high noise levels can alter the behaviour of the fauna inhabiting the wetland, such as birds, amphibians, fish and mammals, and can interfere with their migration, feeding and reproduction patterns.
Dust: the release of dust into the atmosphere can affect air quality, which has negative effects on the environment and the health of living beings in the area. As in all ecosystems of this type, dust can also be deposited in water, affecting water quality and reducing its ability to support aquatic life. Dust deposited on plants and trees is also capable of reducing the amount of sunlight reaching the leaves, causing difficulties in photosynthesis and thus slowing their growth and reproduction. Dust affects the health of animals living in the wetland, especially those that feed on contaminated plants or drink contaminated water.
Fragmentation: fragmentation can affect the structure and composition of the wetland ecosystem, with consequences for the food chain and the survival of wetland-dependent species. Fragmented ecosystems are more vulnerable to external disturbances (due to reduced resilience), such as forest fires, disease and invasion by exotic species. Fragmentation can reduce the capacity of the wetland to provide ecosystem services, such as water purification, climate regulation and flood control.
In the first photo carousel it can be seen that there are olive plantations and small orchards, which can lead to leaching of used fertilisers and damage to the ecosystem of the area.
One of the most important impacts found was the dumping of urban waste water, which alters the water and landscape, we observed how as we approached it we perceived the bad smell and signs of eutrophication, remains of stalks, etc. Although Padul has a treatment plant, it is insufficient to avoid this important contamination.
Impacts on the route that alter the landscape: there are some signs and rubbish left by visitors. There are also remains of the old exploitation of the peat bog that remain and could be a danger to animals that are cut by the rusty pipes.
During the tour we observed invasive species: these species displace the autochthonous species, affecting, in the case of the reed, plant species that cannot be installed in the area, as well as preventing others from being installed underneath them. Another example is the barbel, which has destroyed native fish populations and seriously affected amphibian species and other animal groups.
Also the carp, which with its whiskers stirs up the bottom and stirs up sand, preventing light from reaching the bottom and preventing the photosynthesis of these plants from taking place and causing them to die.
Photograph by Ana Mª Rebollo Baños, 2011
Here we can see another change in the route due to the invasion of the Asian cane. The first photograph, by Ana María Rebollo Baños, is from 2011. The second was taken by us when we went to the lagoon. You can appreciate the great change that has taken place in that part of the path taking as a reference a sign that has not been moved, and we can see the bad conditions there.