FishTracker: a GIS toolbox for kernel density estimation of animal home ranges that accounts for transit times and hard boundaries

Laffan, Shawn W.; Taylor, Matthew D.; Bay, Nelson

doi:10.36334/modsim.2013.h2.laffan

Cited by 2 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FishTracker, an add-in tool in ArcGIS, was used to calculate the home range and core areas of juvenile and adult blue suckers from the active telemetry detections (Laffan and Taylor 2013). The core area is defined as the 50% kernel density estimate (KDE) and the home range is the 90% KDE.…”

Section: Core Area and Home Rangementioning

confidence: 99%

Blue sucker habitat use in a regulated Texas river: implications for conservation and restoration

et al. 2021

View full text Add to dashboard Cite

Species conservation requires a clear understanding of habitat availability and subsequent use of those habitats. In cases where species declines have occurred and gone undetected by conservation managers, habitat alteration, fragmentation, and loss are often the largest contributors. River fragmentation often results in altered flow regimes, subsequently impacting the availability of riverine habitats. Blue sucker (Cycleptus elongatus) is associated with riffle and run habitat, which is especially impacted when river flows are altered. The goal of this research was to identify the extent of blue sucker habitat and mobility of the species in the Colorado River, Texas. To understand habitat selection and use, blue suckers (N = 49) were surgically implanted with telemetry tags. During 2015-2017, thirty-eight attempts were completed to relocate individuals. Optimized hotspot analysis identified three river reaches critical for blue suckers that accounted for 20% of the study area. Blue suckers used these locations year-round including during spawning. Habitats used by blue sucker were composed of gravel, cobble, boulder, and bedrock typically in riffle and run habitat. Mobility, as measured by home range size, increased as riffle density decreased. Larger home ranges were presumably necessary to find habitat to complete aspects of their life history. Results of this study suggest suitable habitats are limited throughout the fragmented riverscape. Conservation action in the form of habitat construction or increased stream connectivity through barrier mitigation could have positive impacts on the future of blue suckers in the lower Colorado River, Texas.

show abstract

Section: Core Area and Home Rangementioning

confidence: 99%

Blue sucker habitat use in a regulated Texas river: implications for conservation and restoration

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Home range size estimations were analysed using the Fishtracker 10.1 toolbox extension in ArcGIS 10.5 software. Fishtracker uses a least-cost path to determine the travel speed between sequential observations and convert it to per-segment travel times (Laffan & Taylor, 2013). The movement rate was then used in a standard kernel density analysis.…”

Section: Discussionmentioning

confidence: 99%

Habitat Use and Movement Activity of Neolissochilus soroides and Channa lucius during Post Inundation of Tembat Reservoir, Hulu Terengganu

Sharir¹,

Zulkipli²,

Mohamad³

et al. 2021

JTAS

View full text Add to dashboard Cite

The drastic changes in hydroelectric reservoir development created a completely new ecosystem that affects the river, particularly in the inundated area. In this study, five Neolissochilus soroides and Channa lucius were surgically implanted with a unique coded acoustic transmitter to observe the habitat utilisation and movement activity in Tembat Reservoir after the inundation process. All of the individuals were released into the transition zone of the reservoir and observed using passive and active acoustic tracking devices from April to December 2018. Kruskal-Walis test showed no significant difference between the average size of core area for N. soroides and C. lucius, x2(1) = 1.320, p = 0.251. The home range also showed a similar result for N. soroides and C. lucius where there was an insignificant difference, x2(1) = 0.273, p = 0.602. However, duration wise, N. soroides spend more time in the transition zone, R1 (M = 2.71 hrs, SE = 0.38), and C. lucius in the riverine zone, R5 (M = 7.14 hrs, SE = 6.13) and R6 (M = 3.85 hours, SE = 6.36). From the active tracking survey, PCA identified three (62.32%) and four (71.19%) components with eigenvalues greater than 1 for N. soroides and C. lucius, respectively. Three most important habitat parameters for N. soroides were the size of river (r = 0.97), existence of canopy cover (r = 0.77), and substrate type (r = 0.79).While, for C. lucius were mesohabitat type (r = 0.79), distance to riffle (r = 0.97), existence of canopy cover (r = 0.90), and elevation (r = 0.90). A 24-hour movement frequency analysis for both species revealed two active hours of movement at dusk and dawn for both species. From the study, it is known that N. soroides and C. lucius respond differently towards the inundation of the reservoir. The findings in this study can be implemented for effective aquatic management and conservation plan to ensure sustainable dam development.

show abstract

FishTracker: a GIS toolbox for kernel density estimation of animal home ranges that accounts for transit times and hard boundaries

Cited by 2 publications

References 28 publications

Blue sucker habitat use in a regulated Texas river: implications for conservation and restoration

Blue sucker habitat use in a regulated Texas river: implications for conservation and restoration

Habitat Use and Movement Activity of Neolissochilus soroides and Channa lucius during Post Inundation of Tembat Reservoir, Hulu Terengganu

Contact Info

Product

Resources

About