Is ‘re-mobilisation’ nature restoration or nature destruction? A commentary
Coastal dunes are experiencing increases in vegetation cover and reduced mobility levels in many sites around the world. Ecology-led approaches to coastal dune management perceive this change as ‘undesirable’ because the increase in plant cover leads to a reduction in partially vegetated to bare sand habitats and the species depending on them. This has generated a shift in the management paradigm where the objective is to revert this trend by intervening in the landscape, with actions ranging from re-introducing grazing and mowing, to mechanical removal of dune form and vegetation (dune ‘rejuvenation’). In some cases, such as many coastal dunes in Britain, this has also led to low controls on visitor pressure and allowing/promoting human trampling as a ‘natural’ way to free up areas of bare sand. This commentary critically analyses the main principles (and terminology) underlying this relatively recent shift in management paradigm, and questions assumptions such as ‘bare sand is good’ and/or ‘mobility is natural’ in the context of dune evolutionary cycles and responses to abiotic and biotic drivers. We review the limitations and dangers of this approach and argue that it is not sustainable given the current climatic and environmental conditions, and that it can increase the risk of coastal erosion and force dune systems to deviate from adapting and changing to direct/indirect drivers. Finally, we present the benefits of a management approach that focuses on minimizing human impacts so that natural processes continue to occur.
KeywordsCoastal dune management Nature conservation Coastal dune evolution
Background and aim
Over the past three decades there has been increasing recognition, particularly in Western Europe, of a relatively rapid increase in the vegetation cover of coastal dune systems, leading to a decline in the extent of mobile dunes and of bare sand cover (Provoost et al. 2011). This process has been described from many countries (Rhind et al. 2001; Jackson and Cooper 2011; Arens et al. 2013; Darke et al. 2013; Miot da Silva et al. 2013; Pye et al. 2014; Moulton et al. 2019; Osswald et al. 2019) and has in turn given rise to studies that attempt to determine the causes of this phenomenon and others which have focused on describing what effects the changes in vegetation and reduced dune mobility have had, or may have, on the dune ecology and geomorphology. In particular dune sealing (loosely defined here as the growth of vegetation across the front of, or within active dunes) has been identified as leading to a decrease in ecological diversity and species richness, as well as posing a threat to rare or endangered species (Smith 2009; Jones et al. 2010; Howe et al. 2010; Houston 2016). These species are mainly ones which are associated with bare sand areas, blowouts, deflation plains and basins, and dune slack wetlands. For example, there is commonly a suite of species (often rare) that occur in damp to seasonally flooded deflation areas/slacks, and these usually disappear once the deflation area/slack is fully stabilized or accretes to where flooding/ponding is less or does not occur (e.g. Esler 1970; Zoladeski 1991; Muñoz-Reinoso 2018). One result of this has been the development of various strategies to reverse the process of dune stabilization and/or sealing and to increase the proportion of bare sand cover leading to the creation of new landform units and/or remobilization of dunes (van Boxel et al. 1997; Arens et al. 2012; Murphy et al. 2019). These strategies are often described as rejuvenating the dunes or making them more dynamic with an implicit, or sometimes explicit, assertion that rejuvenated dunes are good and vegetated, static dunes are bad. Increasing dune mobility and decreasing vegetation cover has thus become an acceptable form of conservation restoration. There have been a wide range of actions aimed at the restoration of dunes of the Atlantic province of Europe, many of them funded through the EU and associated with LIFE Nature projects (Geelen et al. 2015; Houston 2016), and justified within the context of implementing the Habitats Directive (EU Council Directive 92/43/EEC on the Conservation of Natural Habitats and of Wild Fauna and Flora). Many of these projects include efforts to reduce vegetation cover through actions ranging from increased grazing, mowing, removal of invasive plant species, and the use of heavy machinery to clear vegetation and to produce artificial blowouts and slots connecting foredunes to inland dunes (Burton 2001; Hoffmann et al. 2001; Grootjans et al. 2002; Terlouw and Slings 2005; Rhind and Jones 2009; Arens et al. 2013; Millett and Edmondson 2013; Ruessink et al. 2018).
In our view the widespread application of this paradigm goes against both our understanding of the functioning of coastal dune systems and the scientific basis for restoration of dunes as natural systems. We are concerned that many activities that are being carried out, or are proposed, have not received the level of critical examination that they should have and that potential shortcomings or adverse consequences are obscured as a consequence. Thus, the purpose of this paper is to describe what we see as the shortcomings and dangers in this approach to dune conservation and to suggest an alternate paradigm within which management of coastal dunes and dune restoration should be carried out. Our focus here is on the Atlantic dunes of western Europe and especially on those in England and Wales.
Factors controlling dune evolution
We begin with a reminder that Nature does not recognise ‘good’ and ‘bad’. These are human values that may be driven, for example, by perception of beauty in a landscape or perceived threats to lives and to infrastructure. Coastal erosion may be a threat to human infrastructure and thus perceived as bad – but in nature it is simply a process. A large dune field with a mix of mobile and fixed dunes with bare patches may be regarded as good because of the contrasting views and wide range of flora and fauna, but it is just one manifestation of natural dune landscapes and no better or worse than any other. In fact, it usually represents just one stage of several possible evolutionary stages (Hesp 2013; de Groot et al. 2017; Pickart and Hesp 2019). Assigning human values to particular processes or landforms/landscapes is not intrinsically unsound. However, when these values are used to justify a particular course of action in the name of dune restoration, rather than simply letting nature take its course, it needs to be clearly indicated. In doing so, the rationale for carrying out the particular form of human intervention or alteration can be incorporated into a thorough assessment of it. We will return to this theme later.
In planning the conservation and restoration of coastal dune systems it is important to recognise the critical role of abiotic properties (e.g. sediment size and mineralogy) and controlling processes (e.g., precipitation and temperature; wind and wave climate; littoral and dune sediment budgets) in determining the characteristics of dune form, dynamics and evolution (Arens et al. 2013). At a global scale, for example, in the absence of human intervention we can expect dunes of the arid Namibian coast or west African arid coastal regions (e.g. Western Sahara) to be characterized by high mobility and a large potential for the inland transfer of sand because high temperatures and low precipitation limit vegetation cover. Conversely, we can expect the dunes of the British coast to be characterized by low mobility and limited inland transport of sand because cool temperatures and high precipitation promote dense vegetation cover. These factors are also reflected in nebkha (discrete dune mound formed in an isolated plant) being the characteristic foredune in Morocco, Western Sahara and Mauritania (mean annual rainfall range 30 - 150 mm) while a more laterally continuous vegetated foredune is characteristic of British coastal dunes. Locally, the potential for mobility is increased by large sediment supply and decreases with small sediment supply. Together, regional climate and sediment supply are important determinants of the spatial variability in coastal dunes at the global, regional and local scale (Hesp 2004; Pickart and Hesp 2019; García-Romero et al. 2019). They also control the potential range of mobility for coastal regions and they therefore set limits on what can be expected for a particular dune system under natural conditions. It is also recognized that the dynamics of coastal dunes will vary with the coastal setting and with the evolution of the coast and the dune field itself (Barrett-Mold and Burningham 2010) so that dunes of barrier islands, such as those on the east coast of North America and the west coast of Europe enclosing the Wadden Sea, are likely to be more dynamic compared to many British dunes because of the absence of stability provided by bedrock substrate and headlands, and the relatively regular occurrence of hurricanes and significant storm surge.
Abiotic factors are also important controls on the temporal variability of the dynamics of coastal dunes, and especially in the extent of bare sand and dune mobility. The magnitude and frequency of storm events controls the temporal pattern of foredune erosion and in turn this, together with the potential rate of sediment supply from the beach, controls foredune evolution and the volume of sand storage (Davidson-Arnott et al. 2018). Some of this variability in storminess may be global or regional in scale, and in western Europe may reflect broad climatic controls (Clarke and Rendell 2011; Clemmensen et al. 2014; Goslin et al. 2018). Variability may also be stochastic, reflecting the interaction of changing storm tracks, and coastal form and orientation (Masselink et al. 2016; Brooks et al. 2017; Castelle et al. 2017). On the East and Gulf coasts of the United States similar variability is associated with the random pattern of the landfall of tropical cyclones (hurricanes) (e.g., Lindner and Neuhauser 2018). The result of this is that on the Atlantic coast of Europe we can expect temporal variations in dune disturbance due to storms that may be synchronous over most, or all, of the region as well as disturbances due to individual storm events that will affect a limited section of the coast.
The interplay of abiotic processes and vegetation in dune systems is complex, particularly in the pioneer zone on the backshore and stoss slope of the foredune (Hesp 1991; Maun 2009). The rate of colonization and development of a continuous vegetation cover depends on the relationship between the rate of sediment supply and the ability of colonizing plants to withstand burial and in turn these will influence the form of the foredune and the rate at which sediment is transferred inland (Ruggerio et al. 2018). This is highlighted by the results of recent attempts to remove introduced Ammophila sp. from the west coast of North America (Pickart 2013; Pickart and Hesp 2019; Darke et al. 2016) and in New Zealand (Hilton et al. 2005; Hesp and Hilton 2013) which produced significant contrasts in the dune form and mobility between native pioneer species and the introduced Ammophila. Within dune fields disturbance may originate in various ways, including development of deflation basins, plains and slacks, and from the migration of slip faces associated with blowouts, parabolic and transgressive dunes (Hesp and Thom 1990) with the magnitude of disturbance varying with the height of the slip face and the rate of its migration (Hesp and Martinez 2007). Blowouts also commonly form as dunefields undergo natural vegetation colonization and stabilization (Hesp 2013; Hesp and Martinez 2007). Reactivation of vegetated dunefields by wind alone, for example, as a result of increased storminess, is much more difficult because of the hysteresis effect which requires much greater wind activity to disturb established vegetation than to maintain a vegetation-free surface (Tsoar 2005; Yizhaq et al. 2009). As a result, in humid environments such as that of western Europe, mobilization of dunes landward of the foredune is initiated primarily by disturbance of the foredune, either naturally or as a result of human activities, while disturbance originating from within the dunefield is commonly caused by human activities.
Additional to the processes described above, coastal areas are exposed to low frequency – high magnitude marine storms with the potential to ‘re-set’ entire dune fields or portions of dune fields. Mathew et al. (2010) document an example on Prince Edward Island on the east coast of Canada where the impact of an intense storm in October 1923 generated a very large storm surge and eliminated the foredune along several tens of km of the shoreline of the NE coast, with wave action penetrating up to 500 m inland. It took nearly 40 years for a vegetated foredune to be restored, during which time large volumes of sand were transported inland and a new transgressive dune field was formed (Mathew et al. 2010; Walker et al. 2017). The growth of the foredune cut off most of the sediment supply to the interior and in the last 30 years the dune field has stabilized and is now largely vegetated. Stabilization of the inland dunes and growth of the foredune has produced a number of ponds and dune slacks which are still evolving. A century after the initial disturbance, the dune system has undergone continuous transformation and the composition and relative abundance of the biotic components have evolved in conjunction with the abiotic components. This has occurred with limited human intervention and presently management by PEI National Park is simply to allow the system to continue to evolve naturally in response to changing sediment budget and rising sea level.
Anthropogenic activities and traditional approaches to dune restoration
There are many studies that have documented the degree to which human activities have reduced the number and area of sand dune systems and have altered the vegetation cover and species of flora and fauna present in dune systems in the UK (e.g. Ranwell 1960a, b; Rhind et al. 2001), in Europe (e.g., Provoost and van Landuyt 2001; Paskoff 2001; Malavasi et al. 2013; Calvão et al. 2013) and elsewhere (e.g. Seabloom et al. 2006; Zarnetske et al. 2010). These alterations have resulted from many actions, including construction of buildings on dune systems, recreational pressures, shore protection structures, introduction and subsequent spread of invasive species, grazing, and many others (Nordstrom 2008). They have also directly affected sand transport and supply to the beach, from the beach to the foredune, and from the foredune inland (Hilton et al. 2006). In response to this, the traditional approach to dune management and restoration in the last few decades of the twentieth century was to protect existing systems from further development, remove infrastructure such as buildings, caravan parks and roads, and to reduce the effects of humans on the dune vegetation by development of paths, boardwalks and fencing, and reduced grazing of livestock (e.g., Ley et al. 2007; Nordstrom and Jackson 2013; Rosario Acosta et al. 2013). This was done within a paradigm of restoring natural functioning of the dune system – particularly the foredune system - and of revegetating bare areas produced by human activities using typical pioneer plants such as marram. In some cases, revegetation of areas in the dune field landward of the foredune involved the planting of trees to stop the migration of sand onto agricultural fields, roads, buildings and other human infrastructure. This was done with the aim of protecting infrastructure and was a result of poor management leading to the destruction of dune vegetation by trampling and the introduction of invasive species to deal with the consequences of it (e.g. marram grass in North America, Australia and New Zealand; Acacia in South Africa; pine trees in Spain and other European countries). Over time, these exotic species artificially stabilized and/or created new dunes resulting in widespread problems including the elimination of native flora, with many current de-vegetation programs now aiming at eradicating introduced species and hence reversing previous management decisions. Alternatively, good management practices involving the removal of artificial stressors and sustainable environmental uses would have allowed the system to seal naturally and hence prevented the need for planting trees.
Shift in paradigm and critical examination of dune rejuvenation objectives
In western Europe since the 1990s a new paradigm has appeared which contrasts in many ways with the traditional one. The object of dune management and restoration under this paradigm is to reduce the proportion of dune covered by vegetation and to increase the area of bare sand and dune mobility. Measures taken to accomplish this include restoration of grazing, reintroduction of rabbits, mowing of vegetation in dunefields and mature dune slacks and deflation basins/plains, mechanical uprooting of scrub, bulldozing of slots through the foredune and the creation of artificial blowouts in the dunefield. In Britain one example of the adoption of this approach is the awarding of a £4.3 million grant for dune restoration to be managed by Natural England in partnership with Plantlife, The National Trust and the Wildlife Trusts. According to the press release accompanying the award (Natural England 2018):
Healthy sand dunes with moving sand are a sanctuary for endangered plants and animals like the natterjack toad, dune gentian and sand lizard. However, these habitats are currently being smothered and fixed by a tide of invasive non-native plants turning it into scrubland. The scheme will: 1) Deliver a programme of removal of invasive species to rebalance the natural processes of dune colonisation; 2) Restore sand dunes and dune slacks; 3) Create bare sand patches by turf stripping and sand scraping; 4) Encourage more people to access and enjoy dunes and take part in their conservation.
The removal of introduced invasive species such as Rosa rugosa and Hippophae rhamnoides (Smith 2009; Richards and Burningham 2011) can be justified as part of an overall objective of restoring the operation of natural processes to the dune systems. However, the other three objectives all involve human interventions which will alter the landscape and interfere with the natural controlling processes or drivers. Thus, 2) “Restoring sand dunes and dune slacks” involves the use of heavy machinery to cut slots in foredunes, the creation of artificial blowouts and the excavation of dunes down to the water table to create dune slacks. Similarly, 3) “Creating bare sand patches...” is accomplished by mechanically stripping vegetation and turf, or by introducing grazing by domestic animals. Finally, 4) “Encouraging people to access and enjoy dunes…” is actually a call to allow visitors to trample the dune vegetation and create random bare sand pathways. This is all guided by a desire to ‘restore’ the dunes to an idealised, more ‘dynamic’, form that is intended to provide a landscape that will: a) maximise biodiversity within each dune system; and b) will provide within it more habitat space geared to promoting the survival of a small number of species of flora and fauna. The latter are primarily those associated with bare sand areas, and commonly existing due to the proximity of the water table, that have been identified as being rare and endangered. The enthusiasm with which this paradigm has been adopted is epitomised in a post on the web site (https://www.gov.uk/government/news/threatened-sand-dunes-given-a-new-lease-of-life) with introductory paragraph stating “Sand dunes across England are set for a golden future” (our emphasis) accompanying the funding announcement to the effect that:
Re-enlivening the sand dunes - much of them now suffocated under a blanket of thick grass and scrub - is urgent if we are to save dune flowers such as the plucky little fen orchid from extinction. Purple milk-vetch and dune gentian, two other rare dune gems, face an increasingly uncertain future without the help of this exciting project. And the really great news is that everybody who visits the dunes can make a difference: we know now that trampling feet is a great way to free up space for rare plants.
One can argue that creating bare patches within vegetated dunes may increase the number of plant, animal and insect species present, i.e. increasing the biodiversity within that system, and that removing late successional vegetation from dune slacks, or creating entirely new ones will do the same thing. This has occurred to an extent in some cases (e.g. Grootjans et al. 2002; Murphy et al. 2019) but the jury remains out in others (Ruessink et al. 2018). However, there is no need for every dune system to have every possible form of flora and fauna. Instead, in a natural system, biodiversity is dependent on the interaction of the abiotic and biotic elements and the resulting biodiversity is neither good nor bad – it is just the outcome of that interaction. Moreover it will change over time as a result of both internal evolution and external forcing. As we noted earlier, there are sufficient differences in the abiotic properties, processes and evolution of the dune landscape in the coastal dunes of Britain and Western Europe to produce a wide range of habitats and an equally wide range of flora and fauna. The removal of introduced species will aid in the restoration of the natural functioning of these systems, thus enhancing the overall biodiversity in the region. As a result, we would argue that there is no scientific justification for any further interventions to alter the functioning of dune systems. Because of the present climate of England and Wales it is likely that vegetation colonization and stabilization of dunes will continue, and there will therefore be an ongoing requirement for continued human intervention to maintain the areas of bare sand and the transfers of sand from the beach and foredune to the interior (Arens and Geelen 2006; Delgado-Fernandez et al. 2019). In effect there will still be significant human impact on the natural system – just of a different sort. Maintaining a status that is not natural (i.e., not adjusted to contemporary environmental conditions) can turn coastal dune management into expensive habitat engineering.
The second set of drivers of intervention to promote the development of dynamic dunes are related to perceived needs to save particular plants, animals and insects that are seen as rare and whose existence may be threatened by the absence of bare sand in the dune system (Rhind and Jones 1999; Howe et al. 2010; Wouters et al. 2012). Again, this seems to be a case where human perceptions of the value attached to a particular species, in this case because it is ‘rare’, have led to the development of a set of actions that are intended to manipulate a whole ecosystem so as to favor the habitat required for these particular few species. This appears to have occurred without sufficient consideration for the impact it may have on other plant and animal communities (e.g., Zarnetske et al. 2010) and whether it is sustainable under existing abiotic conditions (Delgado-Fernandez et al. 2019). In particular, it seems that the proposed actions are designed to replicate conditions from decades ago that came into existence primarily because of human disturbance of dune vegetation. The increased dune sealing and/or vegetative stabilization as a result of a reduction in anthropogenic disturbance has led to a reduction in bare sand and thus it can be expected that there is a reduction in habitat suitable for bare-sand specialists. However, as noted earlier, taken as a whole, natural dune environments will always have some areas of bare sand, especially in the foredune zone, and the areas will likely expand and contract temporally and spatially as a result of the timing and magnitude of natural disturbance and coastal evolution.
If dune management is focused on increasing the proportion of dune systems that are largely free of human impacts and are able to evolve naturally then this is likely to have the greatest benefit for all dune species. Manipulating the system to favor a few chosen species runs the risk of endangering the system as a whole; and this is particularly true of suggestions to permit visitors to the beach and dune system to run and trample all over the dunes. The potential for habitat destruction is especially important for the backshore, embryo or incipient dune and the toe of the stoss slope of the foredune where the pioneer perennial and annual plant species are most vulnerable to trampling. Increases in trampling intensity can lead to long lasting ecosystem changes including a decrease in species diversity, alterations to the proportion of different species, and dissemination of invasive species as people’s clothing and dog’s hair transport seeds from nearby gardens and other locations (Hesp et al. 2010; Malavasi et al. 2016; Pérez-Maqueo et al. 2017). Furthermore, little consideration is being given to concerns arising from dune rejuvenation leading to increased coastal erosion (Lindell et al. 2017). Vegetation reduces wave run up dune erosion by approximately 40% (Feagin et al. 2019), with vegetated foredunes having post-storm sediment volumes that are larger than dunes with no vegetation (Maximiliano-Córdova et al. 2019). The presence of plants decreases scarp retreat by over 30%, and mature roots double the time for dune structural failure and increase the shear required to erode sediment by 180% (Sigren et al. 2014).
Finally, some reports have suggested that sealing and stabilization of the dunes and the reduction of sand transfers inland will somehow make the dune system more vulnerable to destruction due to sea level rise (Rhind and Jones 2009). There is no geomorphological basis for this that we are aware of. Relative sea level rise will inevitably lead to more frequent erosion of the foredune during storms and enhanced landward transfers over the dune crest and as a result of blowout development (Davidson-Arnott 2005; Pye and Blott 2016a; Walker et al. 2017). However, artificial enhancement of inland sand transfers may leave the foredune more vulnerable to enhanced scarping and/or overwash and thus to destruction of inland habitats that are protected by the presence of the foredune. If natural dune processes are permitted to operate without intervention, the only management required is to ensure that there is sufficient area inland for dune translation or migration to take place – i.e., that coastal squeeze does not occur (Pontee 2013).
Re-focusing coastal dune management
The changing temporal and spatial nature of coastal dune systems has been captured in many studies (e.g., Nordstrom et al. 1990; Sherman and Bauer 1993; Maun 2009; Reed et al. 2009; Davidson-Arnott et al. 2019; Hesp and Walker 2013; Hesp 2013; Walker et al. 2017) but we select the following reflection by Rhind et al. (2001, p.377):
… At Newborough Warren there is compelling evidence that the vegetation cover has been through major phases of change and that at some time in the future, it may undergo a complete reversal of its current trend. Are we ever therefore justified in attempting to either retard or reverse this process of change? Such action has certainly been a general characteristic of past conservation management. When dunes were more mobile there were attempts to stabilize them; now the emphasis is often more on destabilization. Furthermore, when dealing with an evolving system should any given point on the spectrum of change be regarded as optimal in terms of conservation value? For example, was Newborough as Ranwell knew it in the 1950s any better or worse than it is today? If there is a lesson to be learnt here, it is that sand dune conservation has to embrace the fact that flux is an integral part of the system. More emphasis should therefore be devoted towards assessing the direction of the current trends, and on extending the timescales over which future management is considered.
There are many forms of dune restoration and certainly no shortage of coastal dunes to restore (Martínez et al. 2013). But ‘restoration’ invites the question of ‘restoration to what?’ and hence implies consideration of aspects such as what is expected of the natural system (Elliott et al. 2007). Following on Rhind et al’s arguments above, how do we choose what to restore dunefields to? Studies can tell us about landform evolution and morphologies of some dune fields formed over the past 10,000 years to the present … so which point in time do we select as some idealised dune state? Labelling a particular dune evolutionary stage (e.g., mobility) as ‘natural’ or ‘desirable’ seems arbitrary and vague, especially within the context of anthropogenic land uses of European dunes going back hundreds of years.
Interfering with the evolution of coastal dunes to maintain artificial levels of bare sand leads to systems that are not natural (i.e., not attuned to the ambient conditions), and, in fact, fight against natural evolutionary processes taking place in the dunefields. Aside from efforts to remove, and at the very least, control the further spread of invasive species, there is no evidence that removing native dune grasses and mature vegetation is restoration but rather landscaping to create ‘desirable’ dune habitats. Pioneer dune species tend to colonize more mobile sections of dune fields with other species following and vegetation succession driving the system towards mature stages characterised by low dune mobility levels. Perceiving low mobility as ‘bad’ in these natural scenarios is a type of perspective because the presence / absence of particular species is simply a result of habitat evolution and dune dynamic change. Instead, we propose that coastal dune management should focus on protecting coastal dunes by minimizing human impacts and controlling visitor pressure, so that dunes can evolve naturally.
The implementation of the Habitats Directive seems to have been conducted without careful consideration of risks to coastal erosion or the changing nature of coastal dunes as a result of both abiotic and biotic drivers. It is also worth noting that many of the coastal dune management experiences shared across EU countries include examples from the Netherlands (see Houston et al. 2001). The Dutch have a clear driving need to manage or intervene in their dunes, in particular maintaining them as dykes and defense structures, and to prevent a re-occurrence of the 1953 storm surge event. Their activities are therefore not often a good example to follow because the scenarios for coastal dune management in Europe are much more diverse and the context varies markedly depending on the particular history and drivers at each dune field.
To our knowledge, while nitrogen aerosol deposition has increased due to industrial activity in parts of Europe (Ten Harkel 1996; van Boxel et al. 1997; Grootjans et al. 2004; Stevens et al. 2010), and the rabbit populations have been reduced (Ranwell 1960b), there is little evidence suggesting that the trend towards vegetation colonization and stabilization of dunes and dune sealing observed over the last few decades is also not natural. Indirect human-induced changes such as nitrogen deposition could be aiding in dune stabilization, but the extent to which these have played a significant role remains to be clearly established (Aggenbach et al. 2017). As Kooijman et al. (2017) detail, the magnitude of nitrogen deposition varies considerably within different countries of western Europe and differs also between sites close to the sea and those inland. In addition, the impact of nitrogen on dune systems varies considerably in relation to factors such as the carbonate content of sands and the extent of activities such as grazing of livestock. Thus, we suggest that any dune management plan that includes proposals to enhance dune mobility artificially because of recent vegetative growth should demonstrate that a mobile dune system would exist under a lowered nitrogen regime and natural conditions. Natural stabilization of dunefields is also now common across the southern hemisphere (and likely not just due to rabbit control as it has occurred where rabbits were never present).
Although a range of human-induced changes such as warmer temperatures and modified precipitation regimes have been cited as potential global drivers for dune sealing (Jackson et al. 2019) there is no evidence that these are playing a primary role at the regional or local scale (Moulton et al. 2019; Delgado-Fernandez et al. 2019; Rodgers et al. 2019). Instead, the consequences of direct human actions leading to artificial dune landscapes (from planting pine trees and widespread issues associated to invasive species to destroying native dune grasses via trampling or with machinery) are well-understood and can be prevented. In our view, the default approach to dune conservation should begin with no intervention and then any proposed artificial disturbances would require a clear assessment of the potential impact of the intervention on the whole dune system with a view to minimize such impact. We acknowledge that some species are important from an ecological point of view and that there may be areas where local vegetation removal could be considered in order to preserve flora and/or fauna that are rare and endangered regionally. Again, we would argue that this situation should occur rarely and should only be implemented after thorough evaluation of the evidence and potential impacts. It is one thing to act against habitat destruction due to human activities (e.g., habitat encroachment due to urbanization or the introduction of invasive species) and quite a different one is to act against habitat change due to the evolution of the system (as in many sites in Britain, where native grasses are removed to artificially inject ‘dynamism’ into the landscape). Attempting to ‘reverse’ natural trends to provide past ‘desirable’ conditions because of a set of rare species forces the landscape to become unattuned to ambient conditions. Dunes change to adapt to environmental conditions and this adaptability is directly linked to their resilience (Kombiadou et al. 2019). While some species might be key from an ecology point of view there is a need to consider the bigger picture and investigate the consequences of displacing the system from its evolutionary path, especially in the context of recent evidence suggesting that rejuvenation can be short-lived and hence unsustainable (Arens et al. 2013; Rodgers et al. 2019) and that it can increase the risk of coastal erosion (Lindell et al. 2017).
In short, we conclude that the primary principle of coastal dune management should be management of people - not management of natural processes.
This work is a contribution to Edge Hill University’s IKEF programme (grant 1IKIDE18). The authors are grateful to Nicholas O’Keeffe for comments on earlier material. PH thanks the BEADS lab and Flinders University for support. IDF thanks Graham Weaver and Natural England staff for critical discussion and on-going dialogue. Thanks to Jeff Ollerhead and an anonymous reviewer for comments on the submitted draft.
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