scholarly journals Prey and predator density‐dependent interactions under different water volumes

2021 ◽  
Author(s):  
Ross N. Cuthbert ◽  
Tatenda Dalu ◽  
Ryan J. Wasserman ◽  
Arnaud Sentis ◽  
Olaf L. F. Weyl ◽  
...  
Keyword(s):  
Predator Density ◽  
Density Dependent ◽  
Water Volumes

scholarly journals Spatio-temporal dynamics of a fish predator: Density-dependent and hydrographic effects on Baltic Sea cod population

PLoS ONE ◽  
2017 ◽  
Vol 12 (2) ◽  
pp. e0172004 ◽  
Author(s):  
Valerio Bartolino ◽  
Huidong Tian ◽  
Ulf Bergström ◽  
Pekka Jounela ◽  
Eero Aro ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Temporal Dynamics ◽  
Predator Density ◽  
Fish Predator ◽  
Density Dependent ◽  
Spatio Temporal

Dynamics of a non-autonomous density-dependent predator–prey model with Beddington–DeAngelis type

2016 ◽  
Vol 09 (04) ◽  
pp. 1650050 ◽  
Author(s):  
Haiyin Li ◽  
Zhikun She
Keyword(s):  
Density Dependence ◽  
Periodic Solutions ◽  
Sufficient Condition ◽  
Positive Periodic Solutions ◽  
Predator Density ◽  
Predator Prey ◽  
Density Dependent ◽  
Predator Prey Model ◽  
Prey System ◽  
Biological Environment

The goal of this paper is to investigate the dynamics of a non-autonomous density-dependent predator–prey system with Beddington–DeAngelis functional response, where not only the prey density dependence but also the predator density dependence are considered, such that the studied predator–prey system conforms to the realistically biological environment. We firstly introduce a sufficient condition for the permanence of the system and then use a specific set to obtain a weaker sufficient condition. Afterward, we provide corresponding conditions for the extinction of the system and the existence of boundary periodical solutions, respectively. Further, we get a sufficient condition for global attractiveness of the boundary periodic solution by constructing a Lyapunov function, arriving at the uniqueness of boundary periodic solutions since the uniqueness of boundary periodic solutions can be ensured by global attractiveness. Finally, based on the existence of positive periodic solutions, which can be ensured by the Brouwer fixed-point theorem, we provide a sufficient condition for the uniqueness of positive periodic solutions.

Urbanization impacts on production and recruitment of Fundulus heteroclitus in salt marsh creeks

2020 ◽  
Vol 645 ◽  
pp. 187-204
Author(s):  
PJ Rudershausen ◽  
JA Buckel
Keyword(s):  
Salt Marsh ◽  
Salt Marshes ◽  
Fundulus Heteroclitus ◽  
Multiple Factor Analysis ◽  
Southeastern Usa ◽  
Density Dependent ◽  
Dependent Relationship ◽  
Juvenile Abundance ◽  
The Relationship ◽  
Throw Trap

It is unclear how urbanization affects secondary biological production in estuaries in the southeastern USA. We estimated production of larval/juvenile Fundulus heteroclitus in salt marsh areas of North Carolina tidal creeks and tested for factors influencing production. F. heteroclitus were collected with a throw trap in salt marshes of 5 creeks subjected to a range of urbanization intensities. Multiple factor analysis (MFA) was used to reduce dimensionality of habitat and urbanization effects in the creeks and their watersheds. Production was then related to the first 2 dimensions of the MFA, month, and year. Lastly, we determined the relationship between creek-wide larval/juvenile production and abundance from spring and abundance of adults from autumn of the same year. Production in marsh (g m-2 d-1) varied between years and was negatively related to the MFA dimension that indexed salt marsh; higher rates of production were related to creeks with higher percentages of marsh. An asymptotic relationship was found between abundance of adults and creek-wide production of larvae/juveniles and an even stronger density-dependent relationship was found between abundance of adults and creek-wide larval/juvenile abundance. Results demonstrate (1) the ability of F. heteroclitus to maintain production within salt marsh in creeks with a lesser percentage of marsh as long as this habitat is not removed altogether and (2) a density-dependent link between age-0 production/abundance and subsequent adult recruitment. Given the relationship between production and marsh area, natural resource agencies should consider impacts of development on production when permitting construction in the southeastern USA.

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