Gut evacuation rates in &lt;i&gt;Nephrops norvegicus&lt;/i&gt; (L., 1758): laboratory and field estimates

Cristo, Margarida

doi:10.3989/scimar.2001.65n4341

Cited by 11 publications

(13 citation statements)

References 36 publications

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“…The R value can be obtained from the results of field experiments under certain conditions (Héroux & Magnan 1996;Cristo 2001) or by laboratory experiments (Sardà & Valladares 1990, Héroux & Magnan 1996Cristo 2001).…”

Section: Daily Ration Modelsmentioning

confidence: 99%

“…Results from feeding studies reveal that N. norvegicus feeds on a wide diversity of prey (Thomas & Davidson 1962;Lagardère 1977;Cristo 1998), presents median stomach fullness indices (Mytilineou et al 1992;Cristo & Cartes 1998), and has lower evacuation rates compared with other decapods (Cristo 2001). The objective of our study was to estimate food consumption by N. norvegicus from the south of Portugal, based on daily ration models, as a quantitative complement to the feeding ecology studies of this important species.…”

Section: Introductionmentioning

confidence: 99%

“…This is a species that has been widely studied in its different aspects of biology and fisheries (Figueiredo & Thomas 1967;Farmer 1975;Chapman 1980;Sardà 1995) but, as Sardà (1995) pointed out, feeding studies were poorly covered. For this reason the feeding ecology of N. norvegicus from the south coast of Portugal has been the subject of several recent studies (Cristo 1998(Cristo , 2001Cristo & Cartes 1998;Cristo & Encarnação 2000).…”

Section: Introductionmentioning

confidence: 99%

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Field estimation of daily ration of Norway lobster (Nephrops norvegicus) in the south of Portugal

Cristo¹,

Castro

2005

New Zealand Journal of Marine and Freshwater Research

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Daily ration estimates of Norway lobster (Nephrops norvegicus) from field samplings over a 24-h cycle were obtained. Four tows were conducted in the middle continental slope, off the south coast of Portugal. The results from Eggers (1977Eggers ( , 1979 and Elliot & Persson (1978) daily ration models were compared, by the Worobec 8-method (1984), showing no significant differences among them. The estimates of food consumption obtained varied from 1.098 to 1.170 g dry food per 100 g body wet weight in males and 1.642 to 1.755 g dry food per 100 g body wet weight in females. Our results were compared with daily rations reported for other crustaceans. Daily ration values were compared and tested by a two-way ANOVA, with interaction, showing significant differences between sexes. This has been registered for other decapods and may be explained by a period of active growth in females, on the onset of vitellogenesis, increasing their nutritional/ feeding needs.

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Section: Daily Ration Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field estimation of daily ration of Norway lobster (Nephrops norvegicus) in the south of Portugal

Cristo¹,

Castro

2005

New Zealand Journal of Marine and Freshwater Research

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“…This model has been considered appropriate for estimating evacuation of relatively easily digested particles from fish stomachs (Jobling 1986). This model has also been applied and fitted to experimental data for another crustacean species, Nephrops norvegicus (Cristo 2001). The estimated average stomach evacuation time in our study of 5.38 h at 2.9°C is lower than the 9.97 h estimated for lumpsucker eggs at 6°C (Mikkelsen & Pedersen 2012).…”

Section: Stomach Evacuation Ratementioning

confidence: 58%

“…The most frequently used models to estimate gastric evacuation rates of crustaceans are exponential decay models (Hill 1976, Sarda & Valladares 1990, Cristo 2001, although an ogive model has been used to estimate the evacuation of lumpsucker eggs in red king crabs (Mikkelsen & Pedersen 2012). One approach to estimate daily rations uses data on average stomach content and the integral of the gastric evacuation function (Olson & Boggs 1986).…”

Section: Introductionmentioning

confidence: 99%

Invasive red king crabs feed on both spawned-out capelin and their eggs

Mikkelsen¹,

Pedersen²

2017

Mar. Ecol. Prog. Ser.

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The aim of the present study was to test the hypothesis that the invasive red king crab Paralithodes camtschaticus may hamper capelin (Mallotus villosus) recruitment through egg consumption. Field studies (2005, 2006), laboratory experiments (2011), and models of consumption were applied. To explore the response of the predator to prey density, crab abundance and capelin egg density were estimated in stratified study areas. Stomach evacuation rates of capelin eggs in red king crab stomachs were investigated experimentally, and the average evacuation time estimated to be 5.38 h at 2.9°C. The average evacuation time was applied to a consumption model where uncertainty in input values was assessed by Monte Carlo simulation. Estimated egg consumption values were 0.04% and 2.23% of the total number of eggs in studied spawning areas, in 2005 and 2006, respectively. The high variability in quantity of eggs in stomachs generated most of the uncertainty in consumption estimates. Red king crabs did not show an aggregative response to capelin egg density, nor was the magnitude of egg consumption correlated with egg density. Dead post-spawn capelin was a major and more important prey than eggs for red king crab. Our findings imply that semelparity in Barents Sea capelin may lead to predator swamping, thereby reducing capelin egg consumption by the invasive red king crab.

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A review of gastric processing in decapod crustaceans

2012

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This article reviews the mechanical processes associated with digestion in decapod crustaceans. The decapod crustacean gut is essentially an internal tube that is divided into three functional areas, the foregut, midgut, and hindgut. The foregut houses the gastric mill apparatus which functions in mastication (cutting and grinding) of the ingested food. The processed food passes into the pyloric region of the foregut which controls movement of digesta into the midgut region and hepatopancreas where intracellular digestion takes place. The movements of the foregut muscles and gastric mill are controlled via nerves from the stomatogastric ganglion. Contraction rates of the gastric mill and foregut muscles can be influenced by environmental factors such as salinity, temperature, and oxygen levels. Gut contraction rates depend on the magnitude of the environmental perturbation and the physiological ability of each species. The subsequent transit of the digesta from the foregut into the midgut and through the hindgut has been followed in a wide variety of crustaceans. Transit rates are commonly used as a measure of food processing rates and are keys in understanding strategies of adaptation to trophic conditions. Transit times vary from as little as 30 min in small copepods to over 150 h in larger lobsters. Transit times can be influenced by the size and the type of the meal, the size and activity level of an animal and changes in environmental temperature, salinity and oxygen tension. Ultimately, changes in transit times influence digestive efficiency (the amount of nutrients absorbed across the gut wall). Digestive efficiencies tend to be high for carnivorous crustaceans, but somewhat lower for those that consume plant material. A slowing of the transit rate allows more time for nutrient absorption but this may be confounded by changes in the environment, which may reduce the energy available for active transport processes. Given the large number of articles already published on the stomatogastric ganglion and its control mechanisms, this area will continue to be of interest to scientists. There is also a push towards studying animals in a more natural environment or even in the field and investigation of the energetic costs of the components of digestion under varying biotic and environmental conditions will undoubtedly be an area that expands in the future.

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Gut evacuation rates in <i>Nephrops norvegicus</i> (L., 1758): laboratory and field estimates

Cited by 11 publications

References 36 publications

Field estimation of daily ration of Norway lobster (Nephrops norvegicus) in the south of Portugal

Field estimation of daily ration of Norway lobster (Nephrops norvegicus) in the south of Portugal

Invasive red king crabs feed on both spawned-out capelin and their eggs

A review of gastric processing in decapod crustaceans

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