Dispersal mode and assessments of recovery on the shores of Gruinard, the ‘anthrax island’

Johnson, Mark P.; Pye, Sankurie E; Allcock, A. Louise

doi:10.1007/s10531-007-9307-y

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…Immigration of molluscan species to areas of newly established artificial hard shores far smaller than hectads seems relatively rapid (Dethier et al ., ; Krone et al ., ). Other studies, however, suggest that recolonization can take decades for species with direct development (Johnson et al ., ). The converse of a positive effect of patch size on the supply of colonists to individual hectads would be an increase in extinction in small fragments of rocky shore.…”

Section: Discussionmentioning

confidence: 97%

Landscape effects in the intertidal around the coastline of Great Britain

Johnson

Maggs

Allcock

et al. 2015

Journal of Biogeography

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25Aim We tested whether the size of habitat patches along the coastline of Great Britain 26 influences molluscan species richness. Results 598 hectads were clustered into 15 groups, with the three largest groups (94% of 38 hectads) having broad associations consistent with hectad dominance by rocky shore habitat, 39 sheltered sediment or sediment on exposed coasts. For all three main groups, there were 40 fewer species in larger patches than would be expected from a random sampling of hectads.

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Section: Discussionmentioning

confidence: 97%

Landscape effects in the intertidal around the coastline of Great Britain

Johnson

Maggs

Allcock

et al. 2015

Journal of Biogeography

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“…Unfortunately, Crossthwaite et al (2012) did not count L. littorea below 15 mm shell height, so their observed site differences cannot be interpreted using the size-structured model. In contrast, a reinterpretation is possible for the reserve effect reported on the shores of Gruinard (Johnson et al, 2008) as density and shell sizes are both available. Gruinard is a small island used for biological warfare tests during the Second World War.…”

Section: Discussionmentioning

confidence: 99%

“…As a result of this, there were no visitors while the island was quarantined, and few visit now that the island has been returned to its original owners. A lack of access to harvesters was interpreted to be the cause of relatively high proportions of large L. littorea on Gruinard by Johnson et al (2008). Mean shell lengths for two shores on Gruinard were 1.84 and 2.28 cm for densities of 121.7 and 4.3 individuals (all sizes) m À2 .…”

Section: Discussionmentioning

confidence: 99%

Picking a way forward: valuing and managing traditional shellfish gathering for Littorina littorea

Johnson

McDermott²

2018

Aquat. Living Resour.

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Littorina littorea (periwinkles) have been harvested by hand picking from the shore since prehistoric times. Harvests are generally unregulated, catches are not linked to particular shores and fisheries statistics are considered to be unreliable. The absence of key data has made it difficult to develop harvesting recommendations. Surveys around Strangford Lough, Northern Ireland were used to investigate the size structure and relationships among densities in different size classes. Three size classes were identified in surveyed L. littorea, with mean shell lengths of 0.81, 1.56 and 2.48 cm. Assuming that the age classes represent year classes, data across different shores suggested that the ratio between densities in successive year classes was not constant. Proportionally fewer individuals were found in the larger, older, size class as the density of the smaller size class on a shore increased. This density-dependent relationship was modelled with a Ricker curve for the year 1 to year 2 and the year 2 to year 3 transitions. The predicted transition rates from Ricker curves were used in a size-structured model to describe L. littorea dynamics. An emergent property of the size-structured model is a decline in mean shell length with overall density of a population. This prediction was supported by the survey data from Strangford Lough and by an independent survey of Irish shores. The size-structured model predicts potential harvests of individuals above 2.06 cm as a function of recruitment rate. Maximum harvest was predicted for a density of 5 year 1 individuals m−2, leading to 13.8 year 3 individuals m−2 or an estimated annual harvest weight of 67 g m−2. Modelled estimates of production provide a means to value shores and develop harvest predictions for management purposes.

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Dispersal mode and assessments of recovery on the shores of Gruinard, the ‘anthrax island’

Cited by 2 publications

References 16 publications

Landscape effects in the intertidal around the coastline of Great Britain

Landscape effects in the intertidal around the coastline of Great Britain

Picking a way forward: valuing and managing traditional shellfish gathering for Littorina littorea

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