Farsi / Persian
NetLogo User Community Models
## WHAT IS IT?
Netlogo model modeling the article Killer whales redistribute white shark foraging pressure on seals “Scientific Reports” (2019) (Salvador J. Jorgensen , Scot Anderson , Francesco Ferretti , James R.Tietz, Taylor Chapple , Paul Kanive , Russell W. Bradley, Jerry H. Moxley & Barbara A. Block)
Abstract: How do interactions between two top ocean predators, white sharks and killer whales affect the sharks predatory behavior along the Southeast Farallon Island and Northeastern Pacific.
## HOW IT WORKS
## HOW TO USE IT
Notice that when the model starts the whales don't swim towards the seals and only after the 50 tick mark will they start to move towards the seals and make the sharks distance themselves.
## THINGS TO TRY
For this model, we would suggest that the user try to change the population of whales using the slider provded. Do this to see how often times, the migration pattern of the sharks is changed as it may decrease faster than normal when more whales are present. We suggest doing the same thing with the sharks and the seals to change all variables. We also suggest paying attention to the seal population as you increase the population of whales and sharks you are able to keep an equilibrium by increasing the seals reproduction.
## EXTENDING THE MODEL
We would also suggest going into the code section and changing the direction that the whales travel in, this sometimes affects the sharks dramatically as they are programmed to avoid the whales.
## NETLOGO FEATURES
He said we dont have to do this
(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)
## RELATED MODELS
For this model, we relied our project on three different models. First, on the wolf and sheep predation model as we had the to program our sharks and whales to eat the seals and we also programmed our seals to reproduce. Secondly, we used a cat and mouse model since our sharks avoid the whales. Lastly, we used the fish and herons model since our sharks and whales had to only rarely prey on the seals.
## CREDITS AND REFERENCES
Jorgensen, Salvador J., et al. “Killer Whales Redistribute White Shark Foraging Pressure on Seals.” Scientific Reports, vol. 9, no. 1, 2019, doi:10.1038/s41598-019-39356-2.
NetLogo 6.1.1 User Manual, ccl.northwestern.edu/netlogo/docs/.
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