Unequal division of food resources suggests feeding hierarchy of signal crayfish (Pacifastacus leniusculus) juveniles

Ahvenharju, Tero; Ruohonen, Kari

doi:10.1016/j.aquaculture.2006.05.006

Cited by 5 publications

(5 citation statements)

References 37 publications

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“…refers to treatment period. F tests based on Wilk's Λ rates in these socially hierarchic animals (Ahvenharju and Ruohonen 2006). In accordance with the mechanism of state-dependent safety generated by high foraging rate (Luttbeg and Sih 2010), a positive correlation would have been expected between boldness and the size of morphological armaments signalling fighting ability (safety), i.e.…”

Section: Discussionmentioning

confidence: 96%

“…Such syndromes can be especially important in socially hierarchical species such as crayfishes. For example, dominance hierarchies affect food uptake levels of individual crayfish (Ahvenharju and Ruohonen 2006). In addition, crayfishes are dependent on the availability of burrows, which provide shelter, and often compete aggressively for them (Ranta and Lindström 1993;Garvey et al 1994;Figler et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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Boldness as a consistent personality trait in the noble crayfish, Astacus astacus

et al. 2010

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Consistent individual differences in behavioural responses to perceived predation risk may have extensive ecological and evolutionary implications. We studied the repeatability of boldness across time and its relation to resource holding potential in the noble crayfish, Astacus astacus L., using predator-naïve immature individuals. We followed individual's shelter use both with and without exposure to the chemical and physical cues of predators, and with and without the presence of a conspecific. In addition, we examined if armament, i.e. relative chelae size, would be correlated with individual differences in behaviour. Individuals showed repeatable behaviours across time and context. Individuals that occupied the shelter in competitive dyadic tests also spent more time in the shelter during individual control observations, suggesting that boldness is a personality trait that does not necessarily relate positively to high resource holding potential in the noble crayfish. The relative size of chelae did not correlate with any of the measured behavioural variables. Our results suggest that boldness can be considered as individually consistent and ecologically important personality trait in the noble crayfish.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Boldness as a consistent personality trait in the noble crayfish, Astacus astacus

et al. 2010

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“…Typically, crayfish consistently exhibit bold traits in environments [45]. For invasive species with social hierarchies, such as crayfish, those that consistently exhibit aggression, boldness, and exploration are more inclined to take risks in the pursuit of food and are better equipped to engage in competitive dominance interactions [62]. These repeatable behaviors in crayfish can reduce the cost of changing behavioral strategies in different population density environments [63], and contribute to the expansion of their territories across different density gradients, ensuring improved resource access and higher reproductive success.…”

Section: Discussionmentioning

confidence: 99%

Effect of Population Density on Personality of Crayfish (Procambarus clarkii)

Su,

Lu,

et al. 2024

Animals

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Personality is widely observed in animals and has important ecological and evolutionary implications. In addition to being heritable, personality traits are also influenced by the environment. Population density commonly affects animal behavior, but the way in which it shapes animal personality remains largely unknown. In this study, we reared juvenile crayfish at different population densities and measured their personality traits (shyness, exploration, and aggression) after reaching sexual maturity. Our results showed repeatability for each behavior in all treatments, except for the shyness of females at medium density. There was a negative correlation between shyness and exploration in each treatment, and aggression and exploration were positively correlated in medium- and high-density females. These indicate the presence of a behavior syndrome. On average, the crayfish raised at higher population densities were less shy, more exploratory, and more aggressive. We found no behavioral differences between the sexes in crayfish. These results suggested that population density may affect the average values of behavioral traits rather than the occurrence of personality traits. Our study highlights the importance of considering population density as a factor influencing personality traits in animals and, therefore, might help us to understand animal personality development.

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“…However, we found considerable interindividual isotopic variability within treatments in this study. One possible explanation for this variability is that when feeding levels are reduced, some individuals could have better access to the artificial diet than others due to the dominant hierarchy, whereby the subdominants compensated their lower rank in hierarchy by consuming less efficient alternative resources, such as H. vertivillata (Ahvenharju & Ruohonen, ). Such food resource differentiation could potentially explain the considerable uncertainty in crayfish isotopic values and the large 95% confidence intervals in food contributions found in this study.…”

Section: Discussionmentioning

confidence: 99%

Growth performance and muscle composition response to reduced feeding levels in juvenile red swamp crayfishProcambarus clarkii(Girard, 1852)

et al. 2019

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Overfeeding in aquaculture can lead to suboptimal growth and increased production costs. Red swamp crayfish, Procambarus clarkii, is one of the most noteworthy species cultured in China, but little information is available on the optimal feeding levels of this species, especially in ponds cultured with macrophytes. In this study, we tested the effects of five different feeding levels (20%, 40%, 60%, 80% and 100% satiation) of an artificial diet on growth performance and muscle composition of juvenile P. clarkii in 15 concrete ponds cultured with the macrophyte Hydrilla verticillata (three replicates for each treatment). The results showed that growth performance decreased only when feeding levels were below 60% satiation. Muscle composition analysis revealed that the moisture and ash contents of muscle did not vary significantly with feeding levels but that the lipid and protein contents of muscle significantly decreased when P. clarkii was fed to 40% satiation. Stable isotope analysis suggested a shift in crayfish diets to easily available H. verticillata when feeding levels decreased. With this study, we hope to encourage crayfish farmers to reduce feeding levels and increase natural food items such as macrophytes in cultured ponds to maximize crayfish yields and reduce production costs.

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Unequal division of food resources suggests feeding hierarchy of signal crayfish (Pacifastacus leniusculus) juveniles

Cited by 5 publications

References 37 publications

Boldness as a consistent personality trait in the noble crayfish, Astacus astacus

Boldness as a consistent personality trait in the noble crayfish, Astacus astacus

Effect of Population Density on Personality of Crayfish (Procambarus clarkii)

Growth performance and muscle composition response to reduced feeding levels in juvenile red swamp crayfishProcambarus clarkii(Girard, 1852)

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