Quantifying sea scallop bed diameter on Georges Bank with geostatistics

Adams, Charles Francis; Harris, Bradley P.; Marino, Michael C.; Stokesbury, Kevin D. E.

doi:10.1016/j.fishres.2010.09.021

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…Additionally, Adams et al. () found strong spatial structure at 1.24 scallops/m 2 (~ C a = 3–4 scallops; Appendix : Table S3) on southwestern and northeastern Georges Bank. Stokesbury and Himmelman () thought local scallop clumping might be due to small‐scale movement by individuals to enhance fertilization, while other workers have suggested movements may be to escape predators (e.g., Caddy , Thayer , Peterson et al.…”

Section: Discussionmentioning

confidence: 99%

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Sea scallops exhibit strong local spatiotemporal structure associated with seabed stability and high flows

Harris

Adams²,

Stokesbury³

2018

Ecosphere

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. 2018. Sea scallops exhibit strong local spatiotemporal structure associated with seabed stability and high flows. Ecosphere 9(3):e02133. 10. 1002/ecs2.2133 Abstract. Sea scallops (Placopecten magellanicus) live along the Northwest Atlantic continental shelf and are aggregated over a broad range of spatial scales (m 2 -10 5 km 2 ). However, little is known about the spatial distribution of local scallop neighborhoods, the scale at which spawning, intra-specific competition, and predator-prey interactions occur. We surveyed 30,995 km 2 of Georges Bank and the Great South ) of scallop habitat. There were 13 persistent high-concentration aggregations (7-217 km 2 ), and all but two occurred on gravel-dominated sediments left by prehistoric glacial retreat. Model-derived benthic boundary shear stresses in the persistent aggregations averaged two times higher than in scallop habitat, but the seabed was about two times more stable because it had significantly less sand and more granule-pebble and cobble sediment. The area occupied by scallops each year varied little (9%) despite a 49% increase in total scallop abundance between 2005 and 2007, suggesting Georges Bank scallops have a proportional density population structure. Most scallops occurred alone or at low concentrations (≤2) where fertilization success is probably poor. The persistent high-concentration aggregations we identified may be critical for successful reproduction and sustainable harvest. Observing organisms at scales corresponding to their individual interactions reveals important processes shaping their landscape-scale spatiotemporal distributions. These processes are obscured by the methods typically employed to estimate abundances of commercial fishery species. The spatiotemporal structure of sea scallop distribution has important implications for the design of abundance surveys and the assumptions underlying stock assessment methods. These should be investigated. Finally, this work suggests that natural disturbance (sediment stability) may play a substantial role in shaping spatiotemporal distributions and dynamics of benthic marine populations.

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Section: Discussionmentioning

confidence: 99%

“…Based on our field observations and spatial analyses of some scallop beds (Adams et al. ), we hypothesize that there are persistent high‐concentration scallop aggregations on Georges Bank. This idea is consistent with decades of observations by commercial scallop fishers but has never been formally investigated.…”

Section: Introductionmentioning

confidence: 86%

Sea scallops exhibit strong local spatiotemporal structure associated with seabed stability and high flows

Harris

Adams²,

Stokesbury³

2018

Ecosphere

Self Cite

View full text Add to dashboard Cite

show abstract

“…Adams et al (2010) surveyed two regions of Georges Bank, close to Nantucket Island, USA, annually from 1999 to 2007 inclusive. They used an underwater camera to enable them to count sea scallops, Placopecten magellanicus.…”

Section: Fisheriesmentioning

confidence: 99%