Physical controls of food supply to benthic filter feeders in the Menai Strait, UK

Tweddle, Jacqueline F.; Simpson, John H.; Janzen, C.

doi:10.3354/meps289079

Cited by 33 publications

(24 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…), similar to that reported by Tweddle et al (2005) for mussels in Menai Strait, but 3 to 10 × higher than the α ITZ (empirical) that we determined for Willapa Bay above. This level of benthic filtration is enough to clear the volume of SSFB 1.2 to 1.8 × daily (Cloern 1982).…”

Section: From Phytoplankton To Oyster Growthsupporting

confidence: 90%

“…Even in systems far below their overall bivalve carrying capacity, bivalve growth rates may be controlled by local depletion and the small-scale details of the circulation (Pitcher & Calder 1998). Progressive depletion of phytoplankton advected across benthic grazers can create strong food-concentration gradients on scales from several km (Norén et al 1999, Tweddle et al 2005 down to just a few meters (Newell 1990). Indeed, the α ITZ (empirical) model run depicted in Fig.…”

Section: Food Competition and Carrying Capacitymentioning

confidence: 99%

See 1 more Smart Citation

Tidal exchange, bivalve grazing, and patterns of primary production in Willapa Bay, Washington, USA

Banas¹,

Hickey

Newton

et al. 2007

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Willapa Bay, Washington, USA, is a shallow, coastal-plain, upwelling-influenced estuary where Pacific oysters Crassostrea gigas are intensively cultivated. CTD transect data show that in the long-term average over the May to September growing season, Willapa Bay is a sink for oceanic phytoplankton, not a net exporter: as the tidal circulation stirs ocean water into the estuary, chlorophyll concentration declines by 30 to 60% relative to a hypothetical dilution of the ocean end-member. A 3D circulation model (General Estuarine Transport Model, GETM) was modified to include a phytoplankton-like tracer subject to variable intertidal benthic grazing rates. The grazing rate that best reproduces the along-estuary phytoplankton biomass profile agrees, within confidence limits, with an estimate of cultivated-oyster filtration from literature values. Oysters and other intertidal benthic grazers may thus be the primary cause of the net loss of phytoplankton within the estuary in summer. These grazers appear to be within a small factor of their carrying capacity: as bay-total filtration capacity is increased in the model, the chlorophyll intrusion shortens and food intake per individual grazer declines. Nevertheless, only 8 to 15% of the net tidal supply of oceanic phytoplankton is consumed within the estuary. Even in this well-flushed system, the small-scale structure of tidal transport -rather than total oceanic supply -controls overall food availability for the benthos.

show abstract

Section: From Phytoplankton To Oyster Growthsupporting

confidence: 90%

Section: Food Competition and Carrying Capacitymentioning

confidence: 99%

Tidal exchange, bivalve grazing, and patterns of primary production in Willapa Bay, Washington, USA

Banas¹,

Hickey

Newton

et al. 2007

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…During the study period, turbulence levels were generally below the noise level of the accustic Doppler current profiler (ADCP) measurement system (Wiles et al 2006). Turbulence was also measured by a Nortec 'Vector' acoustic Doppler velocimeter (ADV) employed 0.03 or 1.90 m above the beds under different weather conditions, confirming that maximum Reynolds stress ~0.002 Pa (Wiles et al 2006) was much lower than in (for example) shallow tidal areas (~1 Pa) (Tweddle et al 2005). Hence, the 2 levels of turbulence applied in the present study (Fig.…”

Section: Turbulent Mixingmentioning

confidence: 75%

Grazing effects of blue mussel Mytilus edulis on the pelagic food web under different turbulence conditions

Maar¹,

Nielsen²,

Bolding³

et al. 2007

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

“…The Menai Strait is strongly tidal and well-mixed with a residual flow to the southwest (Tweddle et al 2005); thus, temperature is unlikely to vary substantially over the study site or between the temperature logger location and the study site.…”

Section: Temperature Seawater Temperature In the Menaimentioning

confidence: 99%

“…Seawater temperature in the Menai Strait was recorded during the study period at the low water mark using a Valeport 600 DR Mk III CTD (Valeport) or Tinytag Plus 2 temperature logger (Gemini Data Loggers) ~3 km southwest of the study site. The Menai Strait is strongly tidal and well-mixed with a residual flow to the southwest (Tweddle et al 2005); thus, temperature is unlikely to vary substantially over the study site or between the temperature logger location and the study site.Catch per unit effort. CPUE data were obtained from the commercial Carcinus maenas fishery operating over the mussel beds in the Menai Strait.…”

mentioning

confidence: 99%

Determining whether catch per unit effort is a suitable proxy for relative crab abundance

Murray

Seed²

2010

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Stock assessments of crabs commonly rely on catch per unit effort (CPUE) data derived from catches in baited traps. Baited traps have been used for many years to estimate the relative abundance of predators in the marine environment. However, traps may result in biased estimates due to inter-and intra-species variations in physiology and behaviour. The aim of this study was to determine the suitability of CPUE as a proxy for the relative abundance of Carcinus maenas. Crab abundance estimates were obtained using underwater camera surveys. The study was conducted on commercial mussel beds in the Menai Strait, United Kingdom. CPUE data were obtained from the local C. maenas fishery operating over the mussel beds. The influence of temperature-dependent feeding rates on CPUE was predicted from the number of mussels consumed at different experimental temperatures in laboratory aquaria. Both CPUE and estimated abundance showed marked seasonal variation. Abundance maxima preceded temperature maxima by 2 mo. CPUE increased with temperature up to 15°C, while relative crab abundance based on visual surveys exhibited a strong positive correlation with day-length. CPUE appears not to be a suitable proxy for the relative abundance of C. maenas because of the effects of temperature on crab activity levels and thus catches. KEY WORDS: Carcinus maenas · Day-length · Feeding · Fisheries · Migration · Photoperiod · Mytilus edulis Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 401: [173][174][175][176][177][178][179][180][181][182] 2010 Several methods have been used previously to assess the relative abundance of Carcinus maenas, including traps with bait (Rewitz et al. 2004) and without bait (Hunter & Naylor 1993, Gascoigne et al. 2005. The effectiveness of baited trap catches as a proxy for relative abundance is dependent on the influence of factors such as feeding rates and reproductive condition, which may vary both temporally and spatially and thus affect the catchability of the species. Baited traps can be both size and sex biased (Williams & Hill 1982, Addison & Lovewell 1991. Population size does undoubtedly influence catches (Maceina et al. 1993, Wright et al. 2006, Walter et al. 2007). However, it is important that the effects of physiological and behavioural factors on baited trap CPUE are understood if these values are to be used to estimate changes in crab stock size.Migration of crabs has a major impact on the intraannual trends in abundance. Annual offshore migrations are undertaken by many crustacean species, including Macropipus holsatus (Venema & Creutzberg 1973), Cancer pagurus (Ungfors et al. 2007) and Carcinus maenas. Welch (1968) suggested that increases and decreases in C. maenas abundance are associated with rising and falling temperature. The estimates used by Welch (1968) were based on baited trap catches and the observations of fishers. There is no doubt that unusually low winter temperatures can result in mass mortality of C. maenas and other ...

show abstract

Physical controls of food supply to benthic filter feeders in the Menai Strait, UK

Abstract: We report herein a study of the role of hydrodynamics in controlling the food supply to benthic filter feeders in the Menai Strait, a narrow channel between the island of Anglesey and north Wales, UK, which is tidally energetic with pronounced residual flow (~350 to 800 m 3 s -1

Cited by 33 publications

References 20 publications

Tidal exchange, bivalve grazing, and patterns of primary production in Willapa Bay, Washington, USA

Tidal exchange, bivalve grazing, and patterns of primary production in Willapa Bay, Washington, USA

Grazing effects of blue mussel Mytilus edulis on the pelagic food web under different turbulence conditions

Determining whether catch per unit effort is a suitable proxy for relative crab abundance

Contact Info

Product

Resources

About