Does this account for the possibility that some birds might just be easier to capture than others, therefore the number that were missed in all counts would likely be higher than in a case where the birds were identical and behaved independently?
Thank you, sir! the repeat mark-recapture is also known as Schnabel estimate. Meanwhile, Chapman estimate is a modified version of the Lincoln-Petersen estimate that is widely used for capture-recapture. Pray for my bachelor fyp guys!!!
I can't think of anything that would last a year, to be honest. The only thing I can think of is fingernail polish covered with something waterproof... but over that period of time I think it would wear off or result in greater rates of predation?
Can you please list out the indices of mark recapture model. I need a list like Lincoln Peterson estimate, Schnabel index like that.. so that it'll be very helpful for doing a dissertation on this topic for the completion of my masters degree
Any chance you could point me in the direction of a paper that uses the repeated mark-recapture formula given here? Or the name of the formula? Trying to use this formula for a class paper. Thanks!
Hi! Thanks a lot for yout video its very clear, i have one question, if in a repeat mark-recapture model you register an individual on day 3 that was marked on day one, you count it normally as a recapture or this need an special treatment? Thanks a lot again
The R2 value would be zero. This suggests that you have an exceptionally large population or a sample size that is insufficient. It would probably indicate that your results as-is are questionable. Thanks for the great question!
Hi, I have a question re: a repeat-mark-recapture method. I will be using a jolly-seber model for trapping palm civets. If I design the trapping for 3 sampling sessions (2 wks apart) and each session will be 2-days straight. If I caught a civet during the 1st day and released it the same day but then got caught (and released) again the 2nd day, how would I treat the animal as data for the jolly seber model? I am confused since the 2 days would be treated as one session in the jolly-seber method. Thanks. Hope my question is clear. ☺
I'm doing a research in which I got a trap happy mouse which got in my traps all 6 trapping nights. I'm wondering if there is a correction for that since my calculated population size now is lower than it probably is in reallity.
Hello, I was working with dogs, to try to stimate the quantity of dogs free on the street and see their movement dinamyc, we worked 2 day, doing 2 observantions each day. How can I apply your formula? Can I add M4 and C4 to formula? and Which is your bibliographic source?. Thanks.
You can definitely add a M4 and C4. I don't have a specific source that I've used for this formula - I believed it to be of relatively common use and practice. Most textbooks I have observed that cover the topic exhibit something to this extent. Interesting to study dogs and movement dynamics!
This completely explained the formula I'd been trying to learn for my lab practical, thank you from the bottom of my heart
You're welcome! Thanks for taking the time to comment.
Very clear explanation, thank you!
+Aleksandr Hovhannisyan Thanks. I'm glad I could help.
Here because of AP biology❤ thx!
today is my final ecology lab terminal nd this help me alot thank you
I'm glad I could be helpful! You're welcome.
Does this account for the possibility that some birds might just be easier to capture than others, therefore the number that were missed in all counts would likely be higher than in a case where the birds were identical and behaved independently?
Thank you, sir! the repeat mark-recapture is also known as Schnabel estimate. Meanwhile, Chapman estimate is a modified version of the Lincoln-Petersen estimate that is widely used for capture-recapture. Pray for my bachelor fyp guys!!!
It is quite clear to me that you know much more about the subject than I do. Good luck!
I would like to estimate population of giant land snails in a protected area, what is there any ways to mark snails that last for 1 year?
I can't think of anything that would last a year, to be honest. The only thing I can think of is fingernail polish covered with something waterproof... but over that period of time I think it would wear off or result in greater rates of predation?
great video! I have to look over it a couple more times, but the explanation is very clear. THANK YOU :)
Thanks so much!
Can you please list out the indices of mark recapture model. I need a list like Lincoln Peterson estimate, Schnabel index like that.. so that it'll be very helpful for doing a dissertation on this topic for the completion of my masters degree
thank you. How can i calculate the 95% confidence interval in the repeated mark-recapture case?
Journal of the American Statistical Association, 2015, p.1491-1499
Any chance you could point me in the direction of a paper that uses the repeated mark-recapture formula given here? Or the name of the formula? Trying to use this formula for a class paper. Thanks!
I'm probably too late but ruclips.net/video/FWpQvwVcPRM/видео.html
Hi! Thanks a lot for yout video its very clear, i have one question, if in a repeat mark-recapture model you register an individual on day 3 that was marked on day one, you count it normally as a recapture or this need an special treatment? Thanks a lot again
Recapture. In the past I’ve used permanent marker on mouse tails. Different colors each day.
Very well explained.But for greater accuracy would( M1C1+M2C2+M3C3+MnCn)/R1+R2+R3+Rn be logical?
yes
What is the difference between the C & R variables in the equation? I found the slides defining them to be confusing.
Nevermind! Thank you!
what if zero marked organisms are present in the second capture???
The R2 value would be zero. This suggests that you have an exceptionally large population or a sample size that is insufficient. It would probably indicate that your results as-is are questionable. Thanks for the great question!
thank you for your reply :)
You're welcome!
The only thing that I do not understand here is how do you find Cn and Rn. Are they just picked randomly or they are defined by something?
Is this lincoln method or schnabel method
No idea, my apologies. Just my summary of the process from what I remembered learning.
Hi, I have a question re: a repeat-mark-recapture method. I will be using a jolly-seber model for trapping palm civets. If I design the trapping for 3 sampling sessions (2 wks apart) and each session will be 2-days straight. If I caught a civet during the 1st day and released it the same day but then got caught (and released) again the 2nd day, how would I treat the animal as data for the jolly seber model? I am confused since the 2 days would be treated as one session in the jolly-seber method. Thanks. Hope my question is clear. ☺
Keep them isolated. So if you caught them, hold on to them for the following day. Release all of them at once when the capturing is over.
@@haykmkrtchian5784 Thanks for this. Will do. 🙂
Mr Cullian Appreciates your video
Thanks, Mr. Cullian!
I'm doing a research in which I got a trap happy mouse which got in my traps all 6 trapping nights. I'm wondering if there is a correction for that since my calculated population size now is lower than it probably is in reallity.
Thank you so much. This was so useful!❤️
I'm happy to help! Thanks!
I'm here because I want to know how many bugs are there in my program
I'm afraid I can't help you there...
Hello, I was working with dogs, to try to stimate the quantity of dogs free on the street and see their movement dinamyc, we worked 2 day, doing 2 observantions each day. How can I apply your formula? Can I add M4 and C4 to formula? and Which is your bibliographic source?. Thanks.
You can definitely add a M4 and C4. I don't have a specific source that I've used for this formula - I believed it to be of relatively common use and practice. Most textbooks I have observed that cover the topic exhibit something to this extent. Interesting to study dogs and movement dynamics!
thank you, this video help and save time a lot
Good luck with the tasks :)
Glad it helped!
I learned a lot thank you
how do you do this for more captures? Im not great at maths aha. I did 6 visits
Just keep on going with the same pattern. It sure gets a bit ugly, but it works and (should get) more accurate.
if I'm counting for m4, should i take the number from m2 or m3 to add to the new individuals?
see john bingham question.
Thanks for the video
No problem!
Nice 👊
Thanks!
Thank you
Population ecology brought me here
Thanks for watching!
so good. Gracias
Glad to help! De nada!
Thank you for your help; you explain very well.
Thank you! I'm glad I could help.
this did not help
Sorry about that! This concept is definitely a tough one.
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we lost bro
this is so bad
real
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real