[tlocoh-info] Using T-LoCo to look at spatial and temporal avoidance between individuals

Andy Lyons lyons.andy at gmail.com
Fri Apr 10 09:46:47 CEST 2015

Hi Nalani,

Yes you have an interesting study. The interactions between individuals 
are at the center of a lot of important questions, and I think there's a 
growing interest in using tracking data to look at interaction. Home 
range overlap, which Minta's (1992) method builds off of, seems like a 
good place to start. You can certainly compute home range overlap in 
T-LoCoH (for details see Measuring area of intersection for isopleths 
<http://tlocoh.r-forge.r-project.org/tips_faqs.html>). T-LoCoH has a bit 
more flexibility than other home methods because it allows you to define 
a home range along a number of gradients (such as revisitation rate or 
directionality), which could be useful in intersection studies depending 
on the question.

I believe the analysis of interactions from movement data is an area 
where more research is needed. Techniques that are based on the 
intersection of home ranges and UDs wash away the temporal dynamics that 
questions like yours are interested in. I present in chapter 6 of my 
some preliminary ideas for using hulls themselves (not isopleths) to 
characterize the spatiotemporal dynamics of two individuals, which might 
be of interest.


On 4/9/2015 8:40 AM, Wayne Getz wrote:
> Hi Nalani:
> Sounds like an interesting study. I look forward to seeing your results.
> Best
> Wayne
>> On Apr 8, 2015, at 10:44 AM, Nalani Ludington 
>> <nalani.ludington at gmail.com <mailto:nalani.ludington at gmail.com>> wrote:
>> Hello all,
>> I am using T-LoCo for a study of black bear in Yosemite National 
>> Park, California. I will be examining how despotic distribution 
>> influences adult male and adult female use of areas of human 
>> development. Part of my study involves looking at males and females 
>> whose home ranges overlap in a developed area. I will look at 
>> presences and absences of each sex in the area of overlap to see if 
>> females are avoiding the shared area when a male is present. I was 
>> wondering if anyone knows if there has been any work done on a 
>> question like this using T-LoCo? The current method that I plan to 
>> use was presented in Minta 1992 (see full citation below). This 
>> method basically takes presences and absences for each animal and 
>> compares them to the expected frequency of spatially independent home 
>> range use by each animal relative to the other, and the expected 
>> frequency of temporally independent home range use by the two animals.
>> Minta, S.C. 1992. Test of spatial and temporal interaction among 
>> animals. Ecological Applications 2: 178-188.
>> Thanks!
>> -Nalani
>>  Nalani Ludington
>> Humboldt State University
>> Wildlife Department
>> 1 Harpst St. Arcata, CA 95521
>> nalani.ludington at gmail.com <mailto:nalani.ludington at gmail.com>
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