DOI: 10.5061/dryad.mw6m905vw
title: Data from: Crocodile social environments dictated by male philopatry

description: Examining the social behaviors of solitary species can be challenging due
 to the rarity in which interactions occur and the large and often
 inaccessible areas which these animals inhabit. As shared space-use is a
 prerequisite for the expression of social behaviors, we can gain insights
 into the social environments of solitary species by examining the degree
 of spatial overlap between individuals. Over a 10-year period, we examined
 how spatial overlap amongst 105 estuarine crocodiles Crocodylus porosus
 was influenced by season, sex and movement tactic. We discovered that
 crocodiles displayed highly consistent spatial overlaps with conspecifics
 between months and across years. Furthermore, male crocodiles that
 exhibited a greater degree of site fidelity displayed more stable social
 environments, while females and males that were less site-attached had
 more dynamic social environments with spatial overlaps between
 conspecifics peaking during the mating season. Our results
 demonstrate how long-term tracking of multiple individuals within the same
 population can be used to quantify the spatial structure and social
 environment of cryptic and solitary species.
description: Baker_et_al_acoustic_telmetry_dataset.csv - The raw acoustic
 telemetry detections of the 174 estuarine crocodile (Crocodylus porosus)
 that have been tagged in the Wenlock and Ducie river since 2008. The data
 has been processed to remove all tag detections from outside of the period
 they were implanted within an inidividual and has been reformated for
 analysis using the 'ReadInputData' function for the VTrack R
 package.  Baker_et_al_acoustic_hydrophone_location.csv
 - The location (latitude and longitiude) of each of the acoustic
 hydrophone stations that have been used as part of the Wenlock and Ducie
 river acoustic telemetry array. Included with the dataset is also the
 distance (km) that each hydrophone station is from the mouth of Port
 Musgrave in both eulidean (sDISTANCE) and distance along the river system
 via least cost paths (rDISTANCE). 
 Baker_et_al_crocodile_movement_tactics.csv - The identity of each
 tagged crocodile, along with their assigned movement tactic and total body
 length (m).  Baker_et_al_study_site_raster.asc - A 50 x
 50 m raster of the Wenlock and Ducie river systems for the extent of the
 acoustic hydrophone array as of 2019. 
 Baker_et_al_study_site_cost_raster.rds - A 50 x 50 m raster of
 the Wenlock and Ducie river systems for the extent of the acoustic
 hydrophone array as of 2019. This raster is used to genterate the least
 cost utilisation distributions of crocodiles. The rivers and their
 tributaries have been assigned a value of 1, and non-crocodile movement
 habitat have been assigned a value of 1000, indicating that it is 1000
 times more difficult to move through non-habitiat than habitat for least
 cost trajectory analyses. Baker_et_al_line_file - A
 folder containing the eight individual files which create the spatial
 lines file of the Wenlock and Ducie river systems for the extent of the
 acoustic hydrophone array as of 2019.