Anthropogenic and natural effects on the coastal lagoons in the southwest of Spain (Doñana National Park)

Sousa, Arturo; García‐Murillo, Pablo; Morales, Julia; García-Barrón, Leoncio

doi:10.1093/icesjms/fsp106

Cited by 26 publications

(20 citation statements)

References 16 publications

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“…Some studies in south-western Europe have shown that the potential influence of climate change on continental aquatic ecosystems can contribute to intensifying the pre-existing impacts of anthropogenic influence (Álvarez-Cobelas et al 2005, Álvarez-Cobelas 2007. These estimates are consistent with studies examining the impact of past climate periods such as the Little Ice Age (Sousa & García-Murillo 2003, Sousa et al 2006 or climatic variations at the end of the late 19 th /early 20 th century in different aquatic ecosystems in the south of the Iberian Peninsula (Sousa et al 2009(Sousa et al , 2010.…”

Section: Discussionsupporting

confidence: 89%

Past and current trophic development in Lake Ammersee - Alterations in a normal range or possible signals of climate change?

Vetter¹,

Sousa²

2012

fal

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In the past decades, nutrient concentrations in several pre-Alpine lakes in central Europe have increased due to human activity in the catchment area. Here, we examine whether this trend will continue in the future, through our analysis of the development of the trophic status, over a period of 25 years (1984-2009), of the pre-Alpine, dimictic tempered Lake Ammersee (South-Eastern Germany). The lake showed signs of an elevated eutrophic status until the 1990s. Immense management activities in the catchment area led to a reduction in the nutrient load in the tributaries. The study of dissolved oxygen, total phosphorus (TP) and chlorophyll-a revealed a substantial improvement in the trophic conditions of the lake. We identified a transition period in the development of trophic levels during the years 1996/1997. Therefore, our investigation is divided into two periods: 1984-1996 and 1997-2009. By comparing values during these two periods, we found that the annual mean TP concentrations of the complete water column declined from 18.2 µg l-1 (1984-1996) to 8.8 µg l-1 (1997-2009). During this period the chlorophyll-a values are in relationship to other trophic variables such as TP, dissolved oxygen and sight depths (R 2 between 0.41 and 0.56). At the same time, during the summer months, the surface temperature in the epilimnion increased (by about 0.8 K per decade), which was approximately in line with the thermal increase (about 0.6 K per decade) in the northern hemisphere (Pearson's correlation coefficient, omitting 2006, of 0.81). In conclusion, in the case of Lake Ammersee, a decrease in nutrient input has led, most recently (1997-2009), to a substantial improvement in the trophic state. This improvement is fundamentally a result of measures taken to correct any anthropogenic impact. Nevertheless, we show that the thermal stability of the lake reacts to climate-triggered alterations. Therefore it seems that the impact of recent climate change on trophic conditions will have to be monitored closely in the future.

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Section: Discussionsupporting

confidence: 89%

Past and current trophic development in Lake Ammersee - Alterations in a normal range or possible signals of climate change?

Vetter¹,

Sousa²

2012

fal

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“…The system of ponds on Doñana's aeolian sands is a good example of Mediterranean temporary ponds. They have been declining with climate change by an increased aridification since the "Little Ice Age" [10][11][12]53,54] but have also been suffering an increased anthropogenic pressure [1,55]. It has been documented how groundwater abstraction for agriculture [13] or for tourism resorts has negatively influenced or dessicated certain ponds in the system [34].…”

Section: Discussionmentioning

confidence: 99%

Effect of Protection Level in the Hydroperiod of Water Bodies on Doñana’s Aeolian Sands

2016

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Mediterranean temporary ponds on Doñana's aeolian sands form an extensive system of small dynamic water bodies, dependent on precipitation and groundwater, of considerable importance for biodiversity conservation. Different areas of the aeolian sands have received different levels of environmental protection since 1969, and this has influenced the degree of conservation and the flooding dynamic of these temporary surface waters. We use the Landsat series of satellite images from 1985 to 2014 to study the temporal dynamic of small temporary water bodies on the aeolian sands in relation to the protection level and to distance to water abstraction pressures from agriculture and residential areas. The results show that even with small and ephemeral water bodies optical remote sensing time-series are an effective way to study their flooding temporal dynamics. The protected areas of the aeolian sands hold a better preserved system of temporary ponds, with a flooding dynamic that fluctuates with precipitation. The unprotected area shows an increase in mean hydroperiod duration, and surface flooded, and a decline in hydroperiod variability. This seems to be due to the creation of irrigation ponds and the artificialization of the flooding regime of the natural temporary ponds, that either receive excess irrigation water or dry-up due to the lowering of the groundwater table level. Although a decline in hydroperiod duration of temporary ponds is seen as negative to the system, an increase in hydroperiod of surface waters due to artificialization, or a decline in variability cannot be considered as positive compensatory effects.

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“…Intensive land use and groundwater exploitation or drainage have led to deterioration of springs (e.g. Howe, 2002), coastal wetlands (Halvorson et al, 2003), lagoons (Sousa et al, 2009), headwater lakes and peatlands (Kvaerner & Snilsberg, 2008).…”

Section: Introductionmentioning

confidence: 99%

Protection of groundwater dependent ecosystems: current policies and future management options

et al. 2014

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Groundwater dependent ecosystems (GDEs) include many terrestrial and aquatic systems with high biodiversity and important ecosystem services. The need for protection of these systems has recently received increasing recognition in many regions, including the European Union (EU), as pressures on groundwater are increasing due to increased consumption in agriculture and intensive land use. A key issue is to provide legislative frameworks that safeguard the ecosystem services these systems provide. This paper reviews European legislation and present methods for theoretical frameworks, and hydrological and ecological observations of GDEs. Insights into the current state of research are provided and gaps in scientific knowledge identified. Different restoration and protection measures, such as buffer zones, are presented and evaluated. Recommendations are given for the future protection of GDEs. Future research should focus on nationally important GDE sites to establish conceptual models describing the individual and interactive impacts of multiple stressors on the hydrological and ecological functioning of GDEs. Proactive management is required to protect GDEs from contamination, for example by using extended buffer zones and careful land use planning in the groundwater capture zone.

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Anthropogenic and natural effects on the coastal lagoons in the southwest of Spain (Doñana National Park)

Cited by 26 publications

References 16 publications

Past and current trophic development in Lake Ammersee - Alterations in a normal range or possible signals of climate change?

Past and current trophic development in Lake Ammersee - Alterations in a normal range or possible signals of climate change?

Effect of Protection Level in the Hydroperiod of Water Bodies on Doñana’s Aeolian Sands

Protection of groundwater dependent ecosystems: current policies and future management options

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