Is Crangon crangon (L. 1758, Decapoda, Caridea) food limited in the Wadden Sea?

Hufnagl, Marc; Temming, Axel; Dänhardt, Andreas; Perger, Robert

doi:10.1016/j.seares.2010.06.001

Cited by 28 publications

(26 citation statements)

References 61 publications

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“…The T dependence of K is comparable to rates determined in starvation experiments (Hufnagl et al 2010c), increasing exponentially from K = 1.08 at 9°C to K = 2.29 at 20°C. Brown shrimp growth performance indices determined in this study are high in comparison to other similar sized crustaceans like Although T and L explained most of the observed growth variability, unexplained variation still remains.…”

Section: Factors Influencing Growthsupporting

confidence: 76%

Growth in the brown shrimp Crangon crangon. II. Meta-analysis and modelling

Hufnagl

Temming

2011

Mar. Ecol. Prog. Ser.

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Existing laboratory and field data on growth were combined, reanalyzed and discussed to generate a holistic temperature-, length-and gender-dependent growth rate (G, mm d -1 ) model for North Sea region brown shrimp Crangon crangon (L.). Length (L, mm) and temperature (T, °C) dependent growth rates of Crangon crangon are highly variable within and among studies but decrease with L and increase with T. Applying general nonlinear regression, mean growth was derived as G = 0.02421·T -0.00115·e 0.08492·T · L (r² = 0.860). Applying quantile regression (75th percentile), a growth model describing growth of the fastest growing fraction of the population was derived as G max = 0.03054·T -0.00104 · e 0.09984·T · L (r² = 0.857). Female growth rates were higher than male growth rates and were similar to G max . In a simulation, G and G max were used with seasonally varying temperature to generate monthly length trajectories (cohorts). Further, length-based mortality was included and the fraction of each cohort attaining minimal commercial size was calculated. May cohorts (5 mm initial length), representing spring recruitment, grew to 50 mm by November if G was used. Application of the fast growth model (G max ) allowed for the same length to be reached 2 mo earlier. We conclude that the autumnal peak in adult abundance in the North Sea is most probably due to recruitment from the spring cohort of the same year. Our results suggest that the previous year's summer cohort contributes little to this autumnal peak because of high cumulative and overwintering mortality.KEY WORDS: Growth rates · Life cycle · Recruitment · Commercial fishing · Size-at-age · Moult Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 435: [155][156][157][158][159][160][161][162][163][164][165][166][167][168][169][170][171][172] 2011 shrimps (> 50 mm) are adult females (Tiews 1954, Martens & Redant 1986.While Temming & Damm (2002) have shown that the spring recruitment most likely originates from the winter egg production of the previous winter, it is still not clear whether this spring recruitment generates the autumn peak of adult density. This uncertainty mainly originates from differences in reported growth rates from both laboratory and field studies. The different hypotheses assign the autumn peak in adult density either to shrimps from the same year's spring recruitment (Kuipers & Dapper 1984), the same year's summer recruitment (Boddeke & Becker 1979) or the previous year's summer recruitment (Campos et al. 2009a). Boddeke & Becker's (1979) hypothesis obviously requires the highest growth rates followed by the life cycle model of Kuipers & Dapper (1984). The latter concept was based on laboratory growth data obtained by M. Fonds (unpubl.), but these rates were too low to connect the maximum juvenile abundance in spring with the maximum landings per unit effort (LPUE) in autumn, as discussed by Beukema (1992). Berghahn (1991) calculated that higher temperatures experienced by juv...

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Section: Factors Influencing Growthsupporting

confidence: 76%

Growth in the brown shrimp Crangon crangon. II. Meta-analysis and modelling

Hufnagl

Temming

2011

Mar. Ecol. Prog. Ser.

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“…All surviving shrimps were frozen at -80°C at the end of each experiment and dry weight was determined after freeze-drying. Applying the length-weight relationship determined by Hufnagl et al (2010b), the condition index (CI) of each shrimp was calculated as CI = dry weight /(1.301 × 10…”

Section: Methodsmentioning

confidence: 99%

“…L was measured to the nearest mm from the scaphocerite to the tip of the uropods using laminated ruled paper. Total length can be converted to carapace length (CL, measured with a caliper) using CL = 0.2317 · L − 0.7486 (Hufnagl et al 2010b).…”

Section: Methodsmentioning

confidence: 99%

“…This assumption is based on calculations done by Temming & Damm (2002) showing that shrimps invad-ing the Wadden Sea at a length of 15 mm in mid June most likely originated from the winter egg production (December to April) and were starting their juvenile life around April or May. Shrimps collected in July were ~20 mm in size and this size class first occurred in Büsum in June (Hufnagl et al 2010b). Larger shrimps collected in May therefore likely represent overwintering shrimps originating from the late summer egg production of the previous year (September to October, i.e.…”

Section: Cohort Effect On Growth Ratesmentioning

confidence: 99%

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Growth in the brown shrimpCrangon crangon. I. Effects of food, temperature, size, gender, moulting, and cohort

Hufnagl

Temming²

2011

Mar. Ecol. Prog. Ser.

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“…Growth reduction due to food limitation was reported by Amara & Paul (2003) for the French coast of the eastern English Channel. Food limitation in brown shrimp has been shown to occur in the German Wadden Sea from November until April, when up to 75% of the population exhibited signs of starvation or food limitation (Hufnagl et al 2010). Nonetheless, Hufnagl et al (2010) conclude that food limitation has only limited direct effects on mortality and instead impairs growth performance.…”

Section: Opposing Trends In the Dutch Wadden Sea: Possible Mechanismsmentioning

confidence: 99%

Brown shrimp abundance in northwest European coastal waters from 1970 to 2010 and potential causes for contrasting trends

Tulp¹,

Bolle²,

Meesters³

et al. 2012

Mar. Ecol. Prog. Ser.

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We investigated long-term trends in abundance of the NE Atlantic population of brown shrimp Crangon crangon based on data collected in annual autumn surveys carried out along the coasts of the North Sea in The Netherlands, Germany and Denmark. Surveys covered some estuaries and intertidal areas, as well as shrimp fishery grounds. The 40 yr period showed distinct regional trend differences, but only in estuarine areas: the Western Dutch Wadden Sea (increase), the Eastern Dutch Wadden Sea (decrease) and the Oosterschelde (decrease). The decrease in the Oosterschelde coincided with the closure of this sea arm from fresh water inflow. Increases in the Western and Eastern Dutch Wadden Sea were driven primarily by increased abundance of small shrimp, suggesting that the causative mechanism likely affected younger shrimp. Trends in potential causes were examined in the 2 regions. Of all abiotic factors investigated, only water clarity decreased significantly in the west but not in the east. Mean abundance of potential predators (cod, whiting, shore crab and swimming crab) was used as an indicator of predation pressure. Shore crab showed similar increases in both areas. In the other 3 species, predator abundance in the east was generally initially higher than in the west, but declined towards similar densities in recent years. Shrimp fishing pressure in NW Europe has increased strongly since the 1990s. Preliminary, spatially resolved logbook data show that shrimp landings from the Western Wadden Sea followed this increase, but those from the Eastern Wadden Sea remained stable. Apart from mechanisms related to fishing pressure and water clarity, a candidate cause of differences in abundance may be differences in food condition or competition for food. Generally biomass of benthos, a primary food for shrimp, increased in the west and remained stable in the east. However, because brown shrimp are omnivorous, quantification of changing fractions of food available to them is difficult.

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Is Crangon crangon (L. 1758, Decapoda, Caridea) food limited in the Wadden Sea?

Cited by 28 publications

References 61 publications

Growth in the brown shrimp Crangon crangon. II. Meta-analysis and modelling

Growth in the brown shrimp Crangon crangon. II. Meta-analysis and modelling

Growth in the brown shrimpCrangon crangon. I. Effects of food, temperature, size, gender, moulting, and cohort

Brown shrimp abundance in northwest European coastal waters from 1970 to 2010 and potential causes for contrasting trends

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