Prey density and a conspecific competitor influence multiple predator effects in a crab - clam foraging system

Liu, Dapeng; Guo, Xiantao; Zhong, Dasen; Wang, Fang; Li, Li; Hu, Nan

doi:10.1016/j.aquaculture.2018.05.015

Cited by 15 publications

(3 citation statements)

References 55 publications

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“…The different age and sex classes of a single predator species appear thus to act functionally as different predator types ('trophic species', as defined by Sih et al 1998). In addition, the diet of a predator can also be altered by the density of the main prey, as shown here and in previous studies (see, e.g., Norrdahl 1989, 1991;Nielsen 1999;Therrien et al 2014;Liu et al 2018). Age and sex segregation in foraging could mean a lower impact on the population of the single species of prey, especially in the context of fluctuating abundance of the main prey.…”

Section: Total Response Of Pygmy Owlssupporting

confidence: 58%

Age and sex differences in numerical responses, dietary shifts, and total responses of a generalist predator to population dynamics of main prey

et al. 2020

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Fluctuations in the abundance of main prey species might shape animal communities, by inducing numerical responses and dietary shifts in predators. Whether numerical responses and dietary shifts differ among individuals of different age and sex has so far gained little attention. These differences could affect how much predators consume main and alternative prey, thus causing variation in predation pressure on main and alternative prey species. We studied the effect of fluctuating main prey abundance (voles) in autumn on the age and sex composition of a food-hoarding population of Eurasian pygmy owls Glaucidium passerinum (327 individuals), and on the species composition of their food stores in western Finland during 2003-2017 (629 food stores). Numbers of yearlings (< 1-year old) of both sexes and adult (+ 1-year old) females increased with increasing vole abundance. During low vole abundance, adult owls stored more small birds and less small mammals than yearlings. Females stored more small mammals than males and showed a tendency to store less birds. The amount of consumed birds (the most important alternative prey), and in particular of crested, willow, great, and blue tits, increased with low vole densities. Our results show that numerical, functional, and total responses of pygmy owls, and probably also other vertebrate predators, to the availability of the main prey in winter are shaped by the age and sex composition of the predator population, which both show large spatio-temporal variation in boreal forests.

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Section: Total Response Of Pygmy Owlssupporting

confidence: 58%

Age and sex differences in numerical responses, dietary shifts, and total responses of a generalist predator to population dynamics of main prey

et al. 2020

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“…In addition, behavioral characteristics such as burrowing speed and horizontal or vertical movement ability can reflect the degree of adaptation to the substrate [ 14 , 17 ]. It is intuitive and rapid to investigate the adaptation of marine organisms to the substrate through behavioral responses, and this method has been widely used for species such as fish [ 13 , 18 ], crabs [ 19 , 20 ], and shrimps [ 2 ]. However, studies on the behavior of benthic shellfish are not yet thorough, and such studies can be used to screen for suitable substrate types for benthic shellfish and provide data for behavioral studies on shellfish.…”

Section: Introductionmentioning

confidence: 99%

Influences of Substrate Grain Size on the Burrowing Behavior of Juvenile Meretrix meretrix

Xue

Fang

et al. 2022

Animals

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The substrate is the key environmental factor that affects the growth, survival, population and distribution of dwelling mollusks in mudflat settings. To clarify the effect of the substrate grain size on soft substrate preference, burrowing ability and behavior during the selection process of juvenile Meretrix meretrix, four different grain size substrates (coarse sand, medium sand, fine sand, and natural substrate) were set up for comparison. The results indicated that: (1) the burrowing ability of juvenile specimens in fine sand was the strongest; (2) the degree (from high to low) of the juvenile’s preference for the four substrates was in the order of fine sand > natural substrate > medium sand > coarse sand; and (3) the selection process of the substrate by the juveniles could be divided into four stages: preparation, selection, burrowing and end stages. These stages showed the behavioral characteristics of a longer selection time and higher percentage of movement in coarse sand. Therefore, our results demonstrated that sea areas or ponds with fine sand as the main component are more suitable for stock enhancement with M. meretrix. These results provide basic data for habitat selection and suitability evaluations for the aquaculture of M. meretrix.

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“…Although shelters are useful, feeding methods are also important. Liu et al [ 21 ] used clams ( Ruditapes philippinarum ) as bait to observe the hunting behavior of a pair of Po. trituberculatus crabs and found that increased bait density effectively reduced the competition between crabs.…”

Section: Introductionmentioning

confidence: 99%

Improving Survival of Juvenile Scalloped Spiny Lobster (Panulirus homarus) and Crucifix Crab (Charybdis feriatus) Using Shelter and Live Prey

Huang

Chang

et al. 2021

Animals

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Cannibalism is a major problem in lobster and crab aquaculture. Reducing the aggressive characteristics of lobsters and crabs can improve survival during the culturing process. In this study, juvenile scalloped spiny lobsters (Panulirus homarus) and crucifix crabs (Charybdis feriatus) were both cultured under different shelter and live prey conditions. Groups with shelter (seaweed and cotton filter) showed a better survival rate than the control group (no shelter; p < 0.05) for both Pa. homarus and Char. feriatus. Co-culturing with live prey (Litopenaeus vannamei) significantly benefited the juveniles of Pa. homarus and visibly increased the survival of juvenile Char. feriatus. Although providing shelter is currently the main method for reducing agonistic behavior, it must be continually altered as the lobsters and crabs grow. Live prey can grow and attract lobsters and crabs to hunt them, and live prey can be supplemented at any time. They can also be used as an additional source of income during the harvest season.

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Prey density and a conspecific competitor influence multiple predator effects in a crab - clam foraging system

Cited by 15 publications

References 55 publications

Age and sex differences in numerical responses, dietary shifts, and total responses of a generalist predator to population dynamics of main prey

Age and sex differences in numerical responses, dietary shifts, and total responses of a generalist predator to population dynamics of main prey

Influences of Substrate Grain Size on the Burrowing Behavior of Juvenile Meretrix meretrix

Improving Survival of Juvenile Scalloped Spiny Lobster (Panulirus homarus) and Crucifix Crab (Charybdis feriatus) Using Shelter and Live Prey

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