Does the Functional Richness of Plants Reduce Wave Erosion on Embryo Coastal Dunes?

Maximiliano-Cordova, Carmelo; Salgado, Karla; Martínez, M. Luisa; Mendoza, Edgar; Silva, Rodolfo; Guevara, Roger; Feagin, Rusty A.

doi:10.1007/s12237-019-00537-x

Cited by 31 publications

(25 citation statements)

References 63 publications

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“…Mobile dunes could be vulnerable to coastal erosion and flooding. However, vegetation on fixed dunes can reduce scarp retreat, wave run up erosion and dune structure failure (Delgado-Fernandez et al, 2019b;Feagin et al, 2019;Maximiliano-Córdova et al, 2019;Sigren et al, 2014). Furthermore, it was also suggested that the effects of sea-level rise may be obscure in developed areas since human efforts may protect and maintain a stable resource base in some degree (Nordstrom, 1994).…”

Section: Changes In Climatementioning

confidence: 99%

Coastal dune mobility over the past century: A global review

Gao

Kennedy

Konlechner

2020

Progress in Physical Geography: Earth and Environment

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The mobility of coastal dunes is characterised by bio-geomorphological responses related to change in boundary conditions, particularly sediment supply, wind and vegetation cover, as well as human activities. There remains uncertainty regarding the relative importance of these drivers on dune mobility at a global scale. In this study, trends and dominant drivers of coastal dune mobility are synthesised through the literature review focusing on shifts in dune mobility over the last century (1870–2018). In total, 176 individual dunes, with 55 dunes from the Europe-Mediterranean area, 23 from Africa, 30 from North America, 23 from South America, 20 from Oceania and 23 from Asia, are reviewed in this work. The results show that there is a worldwide trend of dune stabilisation, with 93% (164 out of 176) of the reviewed sites showing a loss of bare sand area due to an increase in vegetation cover and urbanisation expansion. Multiple factors have contributed to the stabilisation process, including (a) land-use change such as the change of traditional farming practises, coastal urbanisation and tourism development; (b) dune stabilisation projects; (c) sediment decline caused by the riverine and coastal constructions; and (d) change in climate (i.e. the decrease in windiness, and the increase in temperature and rainfall) and storms. Our results suggest human intervention played a dominant role in altering dune mobility for most dunes during the past century, while climate and storms are also important drivers, especially for dune sites with limited human activities.

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Section: Changes In Climatementioning

confidence: 99%

Coastal dune mobility over the past century: A global review

Gao

Kennedy

Konlechner

2020

Progress in Physical Geography: Earth and Environment

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“…We expect different clonal expansion strategies to be advantageous in different environmental settings. In physically challenging environments a tight shoot clumping – indicative of Brownian‐like expansion (Reijers et al ., 2019b) – may enhance engineering strength and protect plants against hydrodynamic forcing or alleviate local anoxia stress (Silliman et al ., 2015; Maximiliano‐Cordova et al ., 2019; Reijers et al ., 2019c; de Battisti and Griffin, 2020). However, in more benign environments a Brownian‐like pattern may hamper plant expansion and local nutrient limitations may restrict growth potential (Fischman et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

Sediment availability provokes a shift from Brownian to Lévy‐like clonal expansion in a dune building grass

et al. 2020

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In biogeomorphic landscapes, plant traits can steer landscape development through plant‐mediated feedback interactions. Interspecific differences in clonal expansion strategy can therefore lead to the emergence of different landscape organisations. Yet, whether landscape‐forming plants adopt different clonal expansion strategies depending on their physical environment remains to be tested. Here, we use a field survey and a complementary mesocosm approach to investigate whether sediment deposition affects the clonal expansion strategy employed by dune‐building marram grass individuals. Our results reveal a consistent shift in expansion pattern from more clumped, Brownian‐like, movement in sediment‐poor conditions, to patchier, Lévy‐like, movement under high sediment supply rates. Additional model simulations illustrate that the sediment‐dependent shift in movement strategies induces a shift in optimisation of the cost–benefit relation between landscape engineering (i.e. dune formation) and expansion. Plasticity in expansion strategy may therefore allow landscape‐forming plants to optimise their engineering ability depending on their physical landscape.

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“…The significance and importance of coastal dune systems are well known (Arens et al, 2001;Hanley et al, 2014;Ruz et al, 2009). Coastal sand dunes, and particularly foredunes, act as a protective barrier on many of the world's coastlines (Carter, 1991;Doody, 2012;Maximiliano-Cordova et al, 2019;Simm et al, 1996) and, hence, are an important natural defence against inundation by seawater of economically and environmentally significant land, infrastructure, and activities (Fernández-Montblanc et al, 2020;Hanley et al, 2014;Maximiliano-Cordova et al, 2019). They are also intrinsically areas of high ecological significance themselves, as well as sources of raw materials, grazing land, and recreation (Doody, 2012;Everard et al, 2010;Hanley et al, 2014;Martínez et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…In order to function as a successful defence, coastal dunes must endure storm damage and erosion (Hanley et al, 2014;Roelvink et al, 2009). Therefore, there is a large amount of interest in the drivers that control dune erosion and accretion as they can dictate the response to, and interactions of, coastal sand dunes with the beach and nearshore (Castelle et al, 2015(Castelle et al, , 2017Davidson-Arnott, 2005;Masselink et al, 2016;Maximiliano-Cordova et al, 2019;Pye and Blott, 2008;Saye and Pye, 2007), and dictate the degree of resilience of coastal dune systems (Houser et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Controls on dune scarping

Davidson

Hesp

Silva

2020

Progress in Physical Geography: Earth and Environment

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The controls that affect the degree of spatio-temporal change to foredunes following scarping are reviewed herein. As sea-levels rises and climate changes, dune scarping will become more common. Thus, it is critical to understand what factors contribute to the magnitude of scarping, and what effect this has on dune systems to better manage coastal erosion into the future. Scarping occurs when foredunes are partially eroded by waves, generally during periods of high water level. The controls on the degree and magnitude of scarping examined include water level, foredune vegetation cover and species present, plant root mass, height and volume of the foredune, the original foredune morphology, surfzone–beach type, and compaction of sediment. Water-level height and duration of high water is the most significant control as it determines the elevation at which wave action can erode the dune and, therefore, the extent of scarping and dune volumetric loss. Higher plant density, greater rooting depth, high root mass, and greater compaction aid in reducing the degree of scaping. The presence of large woody debris and wrack may also influence the degree of scarping. The effects scarping has on the morphology of a foredune after the initial erosion event can range from small changes (e.g. minor, small scarps and slight slumping), to moderate changes such as the foredune translating landwards, to large change such as the transition of an entire dune system into a new transgressive dunefield phase. A new model summarising the key controls and their relationship/significance to the magnitude and extent of scarping is presented.

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Does the Functional Richness of Plants Reduce Wave Erosion on Embryo Coastal Dunes?

Cited by 31 publications

References 63 publications

Coastal dune mobility over the past century: A global review

Coastal dune mobility over the past century: A global review

Sediment availability provokes a shift from Brownian to Lévy‐like clonal expansion in a dune building grass

Controls on dune scarping

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