Questions tagged [wildlife-ecology]

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4
votes
0answers
39 views

Quantifying similarity between two independent areas?

I'm assessing areas for suitability for species relocations, so essentially I'm looking to quantify how similar a possible relocation site is to a source site in several metrics. The species may ...
0
votes
1answer
27 views

Why do moving window neighborhood analysis when building habitat model using ArcGIS Desktop?

I am currently developing a habitat model within ArcGIS Desktop for coyotes as a final project. One of the papers I read for my research did something similar, but they used a moving neighborhood ...
6
votes
2answers
172 views

Calculating daily travel distance from large dataset using QGIS?

My dataset is around 200 days worth of data on the daily distance travelled by a troop of monkeys. I've never properly used QGIS on my own so don't really know where to start. All of the days are ...
1
vote
2answers
29 views

SDM: Dealing with coarse environmental data

I wish to determine the most important environmental covariates controlling a species distribution. I have a large collection of species presence data for a small survey area (e.g., 600 presence ...
4
votes
1answer
105 views

Automatic polygon placement from trail

I have a shapefile with >300 points that correspond to the points where vegetation survey plots were carried out 10m from the road on both sides. Plots have the dimensions 20mx50m. The attributes ...
2
votes
0answers
287 views

Choosing bandwidth and scaling factor for Kernel Density Estimate in ArcGIS Desktop?

I have some points that represent animal locations over the course of a few months at the scale of ~20 sqkm. I am emulating the work of previous researchers in this field, but I'm having trouble ...
5
votes
2answers
1k views

Adding attribute features from the intersection of a grid with a point shapefile?

I want to calculate the frequency of observation of an animal in a forest habitat within the different zones of my study area. To do this I will use the simple equation (number of individuals)/(survey ...
1
vote
2answers
15k views

Error in (function (classes, fdef, mtable) : unable to find an inherited method for function ‘shapefile’ for signature ‘“NULL”’

I've used the following code to generate home range isopleths using r: library(rhr) library(rgeos) #list all *.txt files. fls <- list.files(path = "C:/Users/evan/Desktop/mydir", pattern = "*.txt",...
2
votes
1answer
11k views

Error: undefined columns selected

My question is simple and hopefully can be answered quickly. I have a code in R that is for calculating home ranges. Everything works except one line of the code, which I've included here: locoh <-...
2
votes
1answer
71 views

Method for Spatial Analysis of Raptor Predation

I currently have presence data on two birds, a falcon species and the grouse that it prefers to hunt. These data are in two point shapefiles, one for each species. The grouse shapefile represents all ...
2
votes
0answers
59 views

How to create a surface area that interpolates and visualizes trends in physical activity in ArcGIS?

I have a dataset that contains several hundred telemetry points for my focal species around twilight hours. Attached to these points are mean values that represent how active the animal was 10 ...
5
votes
1answer
123 views

Relative position of nodes

I am studying bird movements and have tracked their locations, ie from flower 1 to flower 2 to flower 3 etc. Each point is mapped out. I am trying to work out the relative direction for each movement ...
1
vote
0answers
101 views

How Can I extract region-specific Information from ascii grid file in and run spatial GLM's in R?

I have data on various climate variables in acsii grid format. I have imported data into R using Rainfall<-read.asciigrid("E:/R Learning Project/Rainfall.txt") and then used plot(Rainfall) to ...
1
vote
2answers
307 views

How to make input data in MaxEnt with several occurences at the same coordinates?

I have insect traps data with several hundreds insects caught every day. In this paper, authors say "Running the model using the number of mosquitoes per trap-night resulted in clustering of high ...
1
vote
0answers
357 views

Generating a predictive map with standardized variables

I have a model from which I am attempting to create a predictive map (in GIS, but I'm aware of some options in R). The response values are constrained to [0,1] using an offset term in the model (see ...
3
votes
3answers
535 views

Saving separate output files when iterating ArcGIS model?

I need to run a model in ModelBuilder 1000 times in order to obtain the average distance of random points in a wildlife species' home range to anthropogenic features. I need to find the average of the ...
5
votes
1answer
269 views

Anyone have recommendations on data collection system for bird point counts?

We will be conducting point counts this spring and summer, and would like to move away from paper data entry forms (yeah, I know). I have spent a little time exploring ArcPad (10), there are ...