Grazing management affects fish diets in a Wadden Sea salt marsh

Friese, Julia; Temming, Axel; Dänhardt, Andreas

doi:10.1016/j.ecss.2018.07.014

Cited by 7 publications

(4 citation statements)

References 74 publications

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“…On the other hand, ungrazed soils may be colonized by tall plant communities and Orchestia sp. (Friese et al, 2018;Olff et al, 1997), a bioturbator that has been related to higher soil porosity (Howison et al, 2015), which in return could increase erodibility.…”

Section: Introductionmentioning

confidence: 99%

How grazing management can maximize erosion resistance of salt marshes

Marin‐Diaz

Govers

Wal

et al. 2021

Journal of Applied Ecology

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Section: Introductionmentioning

confidence: 99%

How grazing management can maximize erosion resistance of salt marshes

Marin‐Diaz

Govers

Wal

et al. 2021

Journal of Applied Ecology

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“…Nevertheless, long-term abandoned saltmarshes with high dominance of E . athericus make an important contribution to diversity if all trophic levels are considered (Rickert et al 2012 , Van Klink et al 2016 ) and provide more fish feeding opportunities in winter (Friese et al 2018 ). Thus, this type of saltmarsh forms an integral part of saltmarsh conservation (Van Klink et al 2016 ).…”

Section: Introductionmentioning

confidence: 99%

“…When grazing is abandoned or reduced, the species becomes dominant (Nolte et al 2019, Bakker et al 2020 and then negatively affects species diversity of plants (Wanner et al 2014) or halophilic spiders (Pétillon et al 2005) and reduces the habitat suitability for certain breeding birds (Mandema et al 2015). Nevertheless, long-term abandoned saltmarshes with high dominance of E. athericus make an important contribution to diversity if all trophic levels are considered (Rickert et al 2012, Van Klink et al 2016 and provide more fish feeding opportunities in winter (Friese et al 2018). Thus, this type of saltmarsh forms an integral part of saltmarsh conservation (Van Klink et al 2016).…”

Section: Introductionmentioning

confidence: 99%

New tools for old problems — comparing drone- and field-based assessments of a problematic plant species

Oldeland

Revermann

Luther-Mosebach

et al. 2021

Environ Monit Assess

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Plant species that negatively affect their environment by encroachment require constant management and monitoring through field surveys. Drones have been suggested to support field surveyors allowing more accurate mapping with just-in-time aerial imagery. Furthermore, object-based image analysis tools could increase the accuracy of species maps. However, only few studies compare species distribution maps resulting from traditional field surveys and object-based image analysis using drone imagery. We acquired drone imagery for a saltmarsh area (18 ha) on the Hallig Nordstrandischmoor (Germany) with patches of Elymus athericus, a tall grass which encroaches higher parts of saltmarshes. A field survey was conducted afterwards using the drone orthoimagery as a baseline. We used object-based image analysis (OBIA) to segment CIR imagery into polygons which were classified into eight land cover classes. Finally, we compared polygons of the field-based and OBIA-based maps visually and for location, area, and overlap before and after post-processing. OBIA-based classification yielded good results (kappa = 0.937) and agreed in general with the field-based maps (field = 6.29 ha, drone = 6.22 ha with E. athericus dominance). Post-processing revealed 0.31 ha of misclassified polygons, which were often related to water runnels or shadows, leaving 5.91 ha of E. athericus cover. Overlap of both polygon maps was only 70% resulting from many small patches identified where E. athericus was absent. In sum, drones can greatly support field surveys in monitoring of plant species by allowing for accurate species maps and just-in-time captured very-high-resolution imagery.

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“…). However, several faunal groups are under-represented, including mammals Lagendijk et al 2018), fish Friese et al 2018), amphibians (Rannap et al 2017) and pollinators Rickert et al 2018). The knowledge gap related to saltmarsh pollinators is particularly important from an ES perspective, due to a pressing need to recognise, preserve, and sensitively manage flower-rich habitats in order to prevent a collapse in crop pollination services (Goulson et al 2015).…”

Section: Livestock Grazing In Salt Marshesmentioning

confidence: 99%

Trade-offs between multiple ecosystem services in UK and US salt marshes

Kate¹

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Salt marshes supply vital ecosystem services (ES), providing material goods and recreation space, regulating natural hazards, and supporting diverse wildlife. However, increases in the utilisation of one ES can lead to reductions or ‘trade-offs’ in others. Because salt marshes are commonly used for grazing livestock, it is important to understand how this grazing impacts the saltmarsh ecosystem, and the consequences for ES supply. This thesis (i) uses a global meta-analysis to investigate the effects of livestock grazing on saltmarsh properties, and finds multiple significant changes to soil, vegetation and fauna properties. The meta-analysis reveals that the response of soil carbon is context dependent – there is no effect in Europe but a reduction in the Americas. (ii) Extensive surveys of soil carbon in grazed and ungrazed US marshes, controlling for key covariates, confirm that grazing trades-off against carbon storage in US marshes. These observational surveys, together with 18-month experimental exclusion of horses from a salt marsh in Georgia, show that grazing also disrupts the plant community in US marshes, but has little effect on resident invertebrates. (iii) Focussing on bees in salt marshes, a three-year study in south Wales, UK shows that grazing trades-off against bee habitat by reducing the flower cover of two key food plants, and that increases in plant diversity with grazing do not compensate for this negative effect. (iv) Spatial analyses of seven saltmarsh ES supplied by an estuary complex in south Wales show that marshes are not achieving their potential as a bee habitat here, due to the predominance of grazing. These analyses also show that the provision of ES by salt marshes is spatially heterogeneous, dependent on management, size and location. As a whole, this thesis adds to the understanding of grazer impacts and ES trade-offs, and supplies crucial data to support evidence-based management of salt marshes.

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Grazing management affects fish diets in a Wadden Sea salt marsh

Cited by 7 publications

References 74 publications

How grazing management can maximize erosion resistance of salt marshes

How grazing management can maximize erosion resistance of salt marshes

New tools for old problems — comparing drone- and field-based assessments of a problematic plant species

Trade-offs between multiple ecosystem services in UK and US salt marshes

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