10.5061/DRYAD.RN8PK0PBN
Hahn, Nathan
0000-0003-1429-6722
Colorado State University
Elephant agricultural use metrics in Mara-Serengeti ecosystem
Dryad
dataset
2021
FOS: Biological sciences
Mara Elephant Project*
Grumeti Fund*
2021-10-19T00:00:00Z
2021-10-19T00:00:00Z
en
https://doi.org/10.1111/1365-2656.13605
38445 bytes
5
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Agricultural use metrics were calculated for 66 elephants as part of a
study to characterize crop use tactics in the Mara-Serengeti ecosystem in
Kenya and Tanzania. Metrics were calculated to capture mean agricultural
use, maximum use from a moving average, and the difference between mean
and max use. These metrics were used to classify agricultural use tactics
for each elephant using Gaussian mixture models. Tables are provided with
metrics and tactic classifications for the lifetime track (TableS3) and
individual years (TableS4). Data contained in these files can be used to
reproduce and further investigate Guassian mixture model clustering and
cutpoint calculation, agricultural use linear mixed models, and tactic
change generalized logistic mixed models in Hahn et al. 2021.
Elephant tracking data was collected Masai Mara, Kenya (IACUC Protocol
No. 1458) and western Serengeti, Tanzania (IACUC Protocol No. xx) between
2011 and 2019. For each individual, metrics were calculated over the
lifespan of the GPS collar (n = 66 individuals) and on a yearly basis (n =
202 individual-years). For each time scale, we used R to calculate the
mean use (aggregate.mean, year.mean), the max 90-day moving average, and
the difference between mean and max (aggregate.delta, year.delta). These
values were used in Gaussian mixture models to identify tactic clusters in
the dataset using different combinations of these values. Tactic
classification results are presented for the top three models identified
in Hahn et al. 2021. Subject age class was assigned to all collared
elephants as young adults (15-34) and old adults (>35) based on
ageing criteria established from known elephant populations (Moss, 2001).
Home ranges were produced using minimum convex polygons. Mean daily
displacement is the average of the total distance moved during a 24-hour
period for each individual.
See the README file for a detailed description of column values.