DOI: 10.5061/dryad.2f2b3
title: Data from: Season and site fidelity determine home range of dispersing and resident juvenile Greenland cod (Gadus ogac) in a Newfoundland fjord

description: We used acoustic telemetry to track age 1 juvenile Greenland cod Gadus
 ogac in Newman Sound, Newfoundland, from October 2010 to November 2012, in
 2 consecutive 1 yr experiments. Using single (Year 1) and reciprocal (Year
 2) transplant study designs, we investigated seasonal dispersal, home
 range area, and potential homing behaviour between coves ~3.5 km apart. We
 tracked individuals moving at metre to kilometre scales, using a network
 of 26 to 32 hydrophones. We converted tag detections to position estimates
 in order to calculate seasonal home ranges and individual movement
 patterns. Home range increased significantly with season (pre-winter,
 winter, and post-winter) in both study years. Mean seasonal home range
 area ranged from 0.29 to 3.47 km2 in Year 1 and 0.43 to 1.72 km2 in Year
 2. In contrast, fish size-at-capture, capture location, and release
 location had no significant effect on seasonal home range. Increased
 movement distance during the winter and post-winter season suggests a
 reduction in predation pressure on age 1 juveniles at these times,
 challenging previous assumptions about their vulnerability. We observed
 variable behaviour spanning residency to kilometre-scale dispersal
 movements, which represent greater distances than previously assumed.
 Similar proportions of control and transplant fish visited the other cove,
 indicating an absence of homing behaviour among dispersing individuals.
 Juveniles of marine fishes are often characterized as key life history
 transition stages between vulnerable larvae and older, larger individuals
 which are less susceptible to predators. Our results indicate that early
 juvenile life stages may be substantially more mobile than presupposed and
 contribute to population connectivity in temperate fishes in ways not well
 described previously.
description: Data from: Season and
 site fidelity determine home range of dispersing and resident juvenile
 Greenland cod (Gadus ogac) in a Newfoundland fjord. A Canadian Healthy
 Oceans Network Population Connectivity, PC-03Acoustic telemetry data
 was collected from October 2010 - October 2011 for 42 individual age 1+
 Gadus ogac individuals tagged with Vemco Ltd™ V7-4L coded acoustic tags,
 programmed to emit a signal at a randomized average delay of every 240 ±
 70 s, and a nominal tag life of 415 days. A receiver network comprised of
 26 Vemco™ VR2W and VR2 hydrophones allowed for continual detection
 throughout Newman Sound over a full year. The data presented have been
 filtered to eliminate spurious detections using both a single detection
 filter (eliminating lone detections for a single fish over 24 hours) and a
 conservative speed filter (eliminating detections &gt; 2 body
 lengths/second apart which could indicate ingestion by a predator). Using
 known positions of the acoustic receivers, we calculated position
 estimates in hourly time intervals using a weighted arithmetic mean to
 increase precision from a presence/absence dataset to a position-based
 dataset. Therefore the beginning of each hour time interval is indicated
 in the "Date" and "Time" field. Positions are
 indicated in decimal degrees in the "COA_Lat" and
 "COA_Lon" fields of the CSV files. Also included are the ArcGIS
 defined "POINT_X" and "POINT_Y" fields using a
 NAD_1983_UTM_Zone_21N projection. Individual fish IDs are included in the
 "Tag" field. The "Transplant" field indicates whether
 the individual was in the control group (site of capture = site of
 release) or the transplant group (site of capture ≠ site of release). Site
 of capture is indicated by the "Cove" field (HC = Heffern's
 Cove; BC= Buckley's Cove).Season and site fidelity
 determine home range of dispersing and resident juvenile Greenland cod
 (Gadus ogac) in a Newfoundland
 fjord_year1.csvSeason and site fidelity
 determine home range of dispersing and resident juvenile Greenland cod
 (Gadus ogac) in a Newfoundland fjord (Year 2). A Canadian Healthy Oceans
 Network Population Connectivity, PC-03Acoustic telemetry data
 was collected from November 2011 - November 2012 for 42 individual age 1+
 Gadus ogac individuals tagged with Vemco Ltd™ V7-4L coded acoustic tags,
 programmed to emit a signal at a randomized average delay of every 240 ±
 70 s, and a nominal tag life of 415 days. A receiver network comprised of
 32 Vemco™ VR2W and VR2 hydrophones allowed for continual detection
 throughout Newman Sound over a full year. The data presented have been
 filtered to eliminate spurious detections using both a single detection
 filter (eliminating lone detections for a single fish over 24 hours) and a
 conservative speed filter (eliminating detections &gt; 2 body
 lengths/second apart which could indicate ingestion by a predator). Using
 known positions of the acoustic receivers, we calculated position
 estimates in hourly time intervals using a weighted arithmetic mean to
 increase precision from a presence/absence dataset to a position-based
 dataset. Therefore the beginning of each hour time interval is indicated
 in the "Date" and "Time" field. Positions are
 indicated in decimal degrees in the "COA_Lat" and
 "COA_Lon" fields of the CSV files. Also included are the ArcGIS
 defined "POINT_X" and "POINT_Y" fields using a
 NAD_1983_UTM_Zone_21N projection. Individual fish IDs are included in the
 "Tag" field. The "Transplant" field indicates whether
 the individual was in the control group (site of capture = site of
 release) or the transplant group (site of capture ≠ site of release). Site
 of capture is indicated by the "Cove" field (HC = Heffern's
 Cove; BC= Buckley's Cove).Season and site fidelity
 determine home range of dispersing and resident juvenile Greenland cod
 (Gadus ogac) in a Newfoundland
 fjord_year2.csv