Hi
I'm plan a new study that will focus on Eliomys melanurus community. I'm aware for two sample methods. the first one is to use Sherman traps and the second is to use IR camera. Do you have other ideas how to sampling population size of this extremely rare species?
Many thanks
Guy
http://onlinelibrary.wiley.com/doi/10.1002/9781118490747.ch11/summary
use occupancy models!
As I am unsure of how hard it is to detect this species at low abundance I have found predator scats/pellet hair analyses are a good way for detecting hard to detect small mammals; however, the data is only really suitable for occupancy at a landscape level
You can use capture-recapture. I have no experience with Eliomys melanurus, but I've used sherman traps to catch E. quercinus and I think is pretty easy to do it. You have to install a grid of 30-40 traps (maybe at 50-100 m) and I recommend to use a spatial capture-recapture or spatial mark-resight.
I recommend capture-recapture using live-traps, but 50 traps may be insufficient to accurate population density if you have low capture rates. I had used 100 traps in a 10x10 grid (but also you can use web based design, see Parmenter et al 2003). You can use 5-7 days if you have high recapture, but for low population densities it is unlikely, so I think 10 days for accurate estimation of population densities. I also recommend a spatially explicit model for discriminating individuals that can move in/out from the grid/web (using this kind of models you can even separate birth from inmigration, as a spatially explicit version of Pollock Robust Design, see Schaub & Royle 2014).
Best regard
Recommended references
Efford, M. (2004). Density estimation in live‐trapping studies. Oikos, 106(3), 598-610.
Parmenter et al 2003. Small-mammal density estimation: a field comparison of grid-based vs. web-based density estimators. Ecological monographs 73: 1-26.
Schaub M & Royle JA 2014. Estimating true instead of apparent survival using spatial Cormack–Jolly–Seber models. Methods in Ecology and Evolution 5: 1316-1326.
The review of methods of capturing and analysis of the big number of rodents is resulted in book, Karasev's Е.В Telitsina A.J., Zhigalsky Island А "Methods of studying of gnawers in field conditions".
Карасева Евгения Васильевна,
Телицына Александра Юрьевна, Жигальский Олег Антонович
Методы изучения грызунов в полевых условиях.— М.: Издательство ЛКИ, 2008.—416 с.
В настоящей книге описаны методы: учетов численности (относительных и абсолютных) и мечения (индивидуального и массового); определения возраста; генеративного состояния грызунов различных видов, а также методы статистиче¬ской обработки основных демографических характеристик популяции. Даны при¬меры применения методов во всех природных зонах России. Предложенная уни¬фикация описанных методов послужит усовершенствованию охраны грызунов одних видов и контролю численности других.
Для экологов и зоологов, а также для студентов вузов соответствующих специальностей.
Karaseva EV, Telitsina A. YD., Zhigalsky О. А. The Methods of Studying Rodents in the Wild Nature
The book contains the description of the methods of estimating of population numbers (absolute and relative) in Rodents and marking of them (individual and group), The authors compare the results obtained by means of various techniques, evaluate their significance and discuss their drawbacks and advantages. The results of application of these methods in different geographic zones of Russia are presented. Most attention is given to methods of marking elaborated recently: radiotclemetry, radioisotopes, and administration of antibiotics. The proposed scheme of identification would promote the conservation of some Rodent species and population control in others.
This book could be of interest to the zoologists (ecologists and ethologists), who work in Research Institutes, Biological Departments of Universities and so on). This book could be useful for students and graduate students.
Издательство ЛКИ. 117312, г. Москва, пр-т Шестидесятилетия Октября, д. 9. Формат 60*90/16. Пет. л. 26. Зое № 1618.
Отпечатано в ООО «ЛЕНАНД».
117312, г. Москва, пp-т Шестидесятилетии Октября, д. 11 А, стр. 11.
ISBN 978-5-382-00822-*
© Издательство ЛКИ, 2008
НАУЧНАЯ И УЧЕБНАЯ ЛИТЕРАТУРА
E-mail: [email protected] Каталог изданий в Интернете:
http://URSS.ru
Телефакс: 7 (499) 135-42-16 URSS Телефакс: 7 (499) 135-42-46
All kind
Successes
Hi Oleg,
The English version as PDF of this book would be very interesting. The Rusian version would be hard for me to understand... :)
Because you are dealing with an extremely rare species I would recommend non-invasive sampling techniques like DNA from hair of feces. Once you have a working sampling design it will be easy to do a CMR analysis.
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