An estimation of the effects of Ensis directus on the transport and burial of silt in the near-shore Dutch coastal zone of the North Sea

Witbaard, Rob; Bergman, M.J.N.; Weerlee, Evaline van; Duineveld, G.C.A.

doi:10.1016/j.seares.2016.12.001

Cited by 8 publications

(8 citation statements)

References 32 publications

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“…The study area is located 80 km north of the Rhine outflow in the far-field plume of the region of freshwater influence (ROFI) (Simpson et al, 1993).Temporary vertical stratification has been observed at the study site (Rijnsburger et al, 2016;Van der Hout et al, 2015) as well as at a location 5 km further offshore (Nauw and Van der Vegt, 2012). The seabed at the study site is sandy with a median grain size of 222 µm, the d50 is 181 µm (fine sands), with a clay percentage of 5% in the top layer of 0.05 m (Witbaard et al, 2016;this volume). (dashed: 2003, straight: 2010-2011) near Egmond.…”

Section: Bottom Frame Locationmentioning

confidence: 96%

“…Our summer SPM concentrations give a hint of the interference of organic matter, as in both years the summer SPM concentrations were lower than in winter for similar wave heights. Not only scavenging by sinking aggregates (Blauw et al, 2012;Jago et al, 2007;Fettweis et al, 2014), but also stabilization of fines in the seabed by the dominant Ensis Directus may have reduced the resuspension signal in summer (Borsje et al, 2008;Witbaard et al, 2016;this volume).…”

Section: Seasonalitymentioning

confidence: 99%

“…It is in this same zone that high densities of the benthic bivalve Ensis directus have been observed (Witbaard et al, 2015), which is a filter feeder thriving on suspended (phytoplankton) particles. These bivalves may contribute to the accumulation of SPM in the TMZ by (seasonal) burial of SPM into the seabed (Witbaard et al, 2016;this volume).…”

Section: Introductionmentioning

confidence: 99%

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The dynamics of suspended particulate matter (SPM) and chlorophyll- a from intratidal to annual time scales in a coastal turbidity maximum

Hout

Witbaard

Bergman

et al. 2017

Journal of Sea Research

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Section: Bottom Frame Locationmentioning

confidence: 96%

Section: Seasonalitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The dynamics of suspended particulate matter (SPM) and chlorophyll- a from intratidal to annual time scales in a coastal turbidity maximum

Hout

Witbaard

Bergman

et al. 2017

Journal of Sea Research

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“…In our study area, Magelona johnstoni, Nephtys hombergii, Spio martinensis, Limecola balthica and Ensis were found most frequently. These are typical species of the dynamic shallow sandy coast [17,[55][56][57] and characterize the Magelona-Ensis community as defined for the very nearshore waters of the Belgian part of the North Sea [58].…”

Section: Discussionmentioning

confidence: 99%

Benthic Species Distribution Linked to Morphological Features of a Barred Coast

Holzhauer

Borsje

Dalfsen³

et al. 2019

JMSE

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The composition of benthic species communities in the nearshore zone is closely related to the hydrodynamic and morphodynamic conditions. Sustainable management of the coastal ecosystem requires knowledge about the natural dynamics as well as human-induced changes on the ecosystem. To improve our knowledge of the benthic species distribution along a dissipative sandy shore with multiple breaker bars, an extensive dataset was collected in the nearshore zone of the barrier islands Ameland and Schiermonnikoog in the Dutch North Sea. From 2010 to 2014, every year, approximately 180 grab samples along 18 cross-shore transects were collected and analyzed for sediment characteristics and macrobenthic species composition. Mixed-effect-models and partial redundancy analysis were used to analyze the importance of morphological features (i.e., slopes, bar crests, and troughs) as an explanatory variable for the benthic species distribution. The results indicate that the morphological features in themselves explain three times more variation than the environmental parameters used. This demonstrates the importance of morphological features as a factor in explaining the distribution of benthic species communities in the nearshore. Detailed information on morphological features is easy to obtain from bathymetry maps or visual inspection. Incorporating morphological features in species distribution models will therefore help to improve sustainable management of our valuable sandy coastal systems.

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“…Sin embargo, aun si los resultados obtenidos se suscriben a los dos bancos estudiados, son un punto de partida al momento de discutir la implementación a gran escala de la pesca mediante hidrojet y sus posibles impactos sobre las comunidades asociadas. Por otra parte, al conocer que los bivalvos en general y las almejas navajas en particular son capaces de modificar las condiciones hidrológicas y la dinámica y granulometría de los sedimentos (Sousa et al 2009;Witbaard et al 2016), habría sido interesante agregar al diseño experimental nuevos tratamientos para evaluar por separado el efecto de la remoción de navajas y el de los disturbios físicos (generados por el chorro de agua producido por el hidrojet). Sin embargo, dado el hábito de la navaja y su capacidad de enterrarse varios centímetros resulta imposible extraerlas sin disturbar el sustrato circundante.…”

Section: D��unclassified

Comunidades infaunales asociadas a la almeja Ensis macha: impacto de la pesca por hidrojet

Méndez

Robledo²,

Molen

2017

Ecol. Austral

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R��. La almeja navaja (género Ensis) se explota en todo el mundo mediante una variedad de artes de pesca. Los impactos ambientales asociados a estas pesquerías incluyen cambios en las características físicas del sedimento y en la columna de agua, también efectos sobre las comunidades asociadas y sobre las mismas especies objetivo. El impacto producido depende principalmente del arte de pesca, del tipo de hábitat y de la intensidad de pesca. Los marisqueros del Golfo San José (Península Valdés, Chubut) emplean el hidrojet, una técnica que implica la inyección de agua en el sustrato para extraer navajas en distintos bancos. Si bien la explotación de este recurso en el Golfo San José aún es incipiente, resulta clave el estudio del impacto de esta pesquería para poder establecer medidas de manejo que se adecuen a la técnica empleada y al ambiente del Golfo, antes de que la pesquería se desarrolle a mayor escala. Así, el objetivo de este estudio fue evaluar de forma experimental el impacto de la pesca de la almeja navaja Ensis macha mediante el uso de la técnica hidrojet sobre las comunidades bentónicas asociadas a los bancos de esta almeja en el Golfo San José. Para ello, se comparó la composición de la fauna bentónica en dos bancos de navajas, uno con actividad extractiva y otro control, en el momento de la pesca y al año de realizada la actividad. Las comparaciones mostraron que en el tiempo inicial no se observaron diferencias entre el banco impactado y el control, mientras que luego de un año de realizada la actividad de pesca, las diferencias en la composición de las comunidades de ambos bancos fueron significativas. Así, el banco control se caracterizó por la presencia de poliquetos, anfípodos y estomatópodos, mientras que los moluscos bivalvos y gasterópodos fueron los grupos más representativos en el banco impactado. Los resultados hallados son útiles para sugerir medidas de conservación y gestión que eviten la degradación de la biodiversidad local.[Palabras clave: Patagonia, suficiencia taxonómica] A��. Infaunal communities associated to the razor clam Ensis macha: water-jet fishing impact. Razor clams (genus Ensis) are exploited worldwide through a variety of fishing gears. The environmental impacts produced by these fisheries include changes in the sediment physical characteristics and the water column, as well as the effects on the associated communities and on the target species. The impact mainly depends on the fishing gear, the type of habitat and the fishing intensity. San José gulf (Península Valdés, Chubut) fishermen use the water-jet technique, which involves the injection of water into the substrate to extract the razor clams. Although the exploitation of this resource in the San José gulf is still incipient, it is important to study the impact of this fishery in order to establish appropriate management measures to related the technique used and to the gulf environment, before the fishery grows. Thus, the aim of this study was to experimentally evaluate the impact of Ensis macha water-j...

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An estimation of the effects of Ensis directus on the transport and burial of silt in the near-shore Dutch coastal zone of the North Sea

Cited by 8 publications

References 32 publications

The dynamics of suspended particulate matter (SPM) and chlorophyll- a from intratidal to annual time scales in a coastal turbidity maximum

The dynamics of suspended particulate matter (SPM) and chlorophyll- a from intratidal to annual time scales in a coastal turbidity maximum

Benthic Species Distribution Linked to Morphological Features of a Barred Coast

Comunidades infaunales asociadas a la almeja Ensis macha: impacto de la pesca por hidrojet

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