The Current Status of Populations of the Sea Cucumber Apostichopus japonicus (Selenka, 1867) in the Far Eastern Marine Reserve

Lysenko, V. N.; Zharikov, V. V.; Lebedev, A. M.

doi:10.1134/s1063074018020074

Cited by 8 publications

(2 citation statements)

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“…The dry weight of A. japonicus is calculated according to Sun et al [4] who reported that the dry weight of A. japonicus equals 0.075×wet weight. The mean wet weight m Aj was set at 150g [47]. Prey to predator conversion efficiency is calculated as e CS ¼ m bact m Aj 0:25 ¼ 0:28�10 À 12 g 150g�0:075 0:25 ¼ 6:22�10 À 15 .…”

Section: Parametrization Of the Modelmentioning

confidence: 99%

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Infective prey leads to a partial role reversal in a predator-prey interaction

2021

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An infective prey has the potential to infect, kill and consume its predator. Such a prey-predator relationship fundamentally differs from the predator-prey interaction because the prey can directly profit from the predator as a growth resource. Here we present a population dynamics model of partial role reversal in the predator-prey interaction of two species, the bottom dwelling marine deposit feeder sea cucumber Apostichopus japonicus and an important food source for the sea cucumber but potentially infective bacterium Vibrio splendidus. We analyse the effects of different parameters, e.g. infectivity and grazing rate, on the population sizes. We show that relative population sizes of the sea cucumber and V. Splendidus may switch with increasing infectivity. We also show that in the partial role reversal interaction the infective prey may benefit from the presence of the predator such that the population size may exceed the value of the carrying capacity of the prey in the absence of the predator. We also analysed the conditions for species extinction. The extinction of the prey, V. splendidus, may occur when its growth rate is low, or in the absence of infectivity. The extinction of the predator, A. japonicus, may follow if either the infectivity of the prey is high or a moderately infective prey is abundant. We conclude that partial role reversal is an undervalued subject in predator-prey studies.

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Section: Parametrization Of the Modelmentioning

confidence: 99%

“…According to the empirical study by Lysenko et al [47] the natural population density of A. japonicus is 0.14 individuals per square meter. The population density at the carrying capacity of the bacteria K C was taken from the literature [7,20].…”

Section: Plos Onementioning

confidence: 99%