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Dynamic Model for Life History of Scyphozoa.

Xie C, Fan M, Wang X, Chen M - PLoS ONE (2015)

Bottom Line: The combination of temperature increase, substrate expansion, and predator diminishment acts synergistically to create a habitat that is more favorable for jellyfishes.Reducing artificial marine constructions, aiding predator populations, and directly controlling the jellyfish population would help to manage the jellyfish blooms.The theoretical analyses and numerical experiments yield several insights into the nature underlying the model and shed some new light on the general control strategy for jellyfish.

View Article: PubMed Central - PubMed

Affiliation: School of Mathematics and Statistics, Northeast Normal University, Changchun, Jilin, P. R. China; College of Science, Dalian Nationalities University, Dalian, Liaoning, P. R. China.

ABSTRACT
A two-state life history model governed by ODEs is formulated to elucidate the population dynamics of jellyfish and to illuminate the triggering mechanism of its blooms. The polyp-medusa model admits trichotomous global dynamic scenarios: extinction, polyps survival only, and both survival. The population dynamics sensitively depend on several biotic and abiotic limiting factors such as substrate, temperature, and predation. The combination of temperature increase, substrate expansion, and predator diminishment acts synergistically to create a habitat that is more favorable for jellyfishes. Reducing artificial marine constructions, aiding predator populations, and directly controlling the jellyfish population would help to manage the jellyfish blooms. The theoretical analyses and numerical experiments yield several insights into the nature underlying the model and shed some new light on the general control strategy for jellyfish.

No MeSH data available.


Related in: MedlinePlus

Impact of substrate and predation on steady state population sizes.(a) Steady state population sizes of polyp and medusa with respect to b1 (the intra-specific competition between polyps). (b) Steady state population sizes of polyp and medusa with respect to d4 (the mortality rate of medusa induced by inter-specific predation). The values of parameters are given by V2 in Table 1 except s1 = 0.2 in (a).
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pone.0130669.g005: Impact of substrate and predation on steady state population sizes.(a) Steady state population sizes of polyp and medusa with respect to b1 (the intra-specific competition between polyps). (b) Steady state population sizes of polyp and medusa with respect to d4 (the mortality rate of medusa induced by inter-specific predation). The values of parameters are given by V2 in Table 1 except s1 = 0.2 in (a).

Mentions: Fig 5(a) depicts the impact of b1 on the steady state population sizes or numbers of polyp and medusa. With the decreasing of intraspecific competition between polyps (b1), the population explodes abruptly. We also note that, as b1 decreases from 0.1 to 0.0001, the number of polyps and medusae increases from 660 to 49000 and from 660 to 6900, respectively. Fig 5(a) only draws a part of the curves (i.e., b1 ∈ (0, 0.016]). The whole curves for b1 ∈ (0, 0.1] shows that, when b1 > 0.016, the increasing of b1 has little effect on the variation of population sizes; for 0 < b1 < 0.016, the change is obvious. The value 0.016 of b1 is just the reciprocal of the maximum carrying numbers (62 ind/cm2) [48].


Dynamic Model for Life History of Scyphozoa.

Xie C, Fan M, Wang X, Chen M - PLoS ONE (2015)

Impact of substrate and predation on steady state population sizes.(a) Steady state population sizes of polyp and medusa with respect to b1 (the intra-specific competition between polyps). (b) Steady state population sizes of polyp and medusa with respect to d4 (the mortality rate of medusa induced by inter-specific predation). The values of parameters are given by V2 in Table 1 except s1 = 0.2 in (a).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4482707&req=5

pone.0130669.g005: Impact of substrate and predation on steady state population sizes.(a) Steady state population sizes of polyp and medusa with respect to b1 (the intra-specific competition between polyps). (b) Steady state population sizes of polyp and medusa with respect to d4 (the mortality rate of medusa induced by inter-specific predation). The values of parameters are given by V2 in Table 1 except s1 = 0.2 in (a).
Mentions: Fig 5(a) depicts the impact of b1 on the steady state population sizes or numbers of polyp and medusa. With the decreasing of intraspecific competition between polyps (b1), the population explodes abruptly. We also note that, as b1 decreases from 0.1 to 0.0001, the number of polyps and medusae increases from 660 to 49000 and from 660 to 6900, respectively. Fig 5(a) only draws a part of the curves (i.e., b1 ∈ (0, 0.016]). The whole curves for b1 ∈ (0, 0.1] shows that, when b1 > 0.016, the increasing of b1 has little effect on the variation of population sizes; for 0 < b1 < 0.016, the change is obvious. The value 0.016 of b1 is just the reciprocal of the maximum carrying numbers (62 ind/cm2) [48].

Bottom Line: The combination of temperature increase, substrate expansion, and predator diminishment acts synergistically to create a habitat that is more favorable for jellyfishes.Reducing artificial marine constructions, aiding predator populations, and directly controlling the jellyfish population would help to manage the jellyfish blooms.The theoretical analyses and numerical experiments yield several insights into the nature underlying the model and shed some new light on the general control strategy for jellyfish.

View Article: PubMed Central - PubMed

Affiliation: School of Mathematics and Statistics, Northeast Normal University, Changchun, Jilin, P. R. China; College of Science, Dalian Nationalities University, Dalian, Liaoning, P. R. China.

ABSTRACT
A two-state life history model governed by ODEs is formulated to elucidate the population dynamics of jellyfish and to illuminate the triggering mechanism of its blooms. The polyp-medusa model admits trichotomous global dynamic scenarios: extinction, polyps survival only, and both survival. The population dynamics sensitively depend on several biotic and abiotic limiting factors such as substrate, temperature, and predation. The combination of temperature increase, substrate expansion, and predator diminishment acts synergistically to create a habitat that is more favorable for jellyfishes. Reducing artificial marine constructions, aiding predator populations, and directly controlling the jellyfish population would help to manage the jellyfish blooms. The theoretical analyses and numerical experiments yield several insights into the nature underlying the model and shed some new light on the general control strategy for jellyfish.

No MeSH data available.


Related in: MedlinePlus