Data for: Seasonally mediated niche partitioning in a vertically compressed pelagic predator guild
Data files
Dec 04, 2023 version files 140.13 MB
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Logan_et_al_3d_KUD_df.csv
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Logan_et_al_IndividualDiveCharacterisitics.csv
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Logan_et_al_SIA_data.csv
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Logan_et_al_TimeSeries_DepthTemp.csv
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README.md
Abstract
Niche partitioning among closely related, sympatric species is a fundamental concept in ecology, and its mechanisms are of broad interest for understanding ecosystem functioning and predicting the impacts of human-driven environmental change. However, identifying mechanisms by which top marine predators partition available resources has been especially challenging given the difficulty of quantifying resource use of large pelagic animals. In the eastern tropical Pacific (ETP), three large, highly mobile and ecologically similar pelagic predators (blue marlin (Makaira nigricans), black marlin (Istiompax indica) and sailfish (Istiophorus platypterus)) coexist in a vertically compressed habitat. To evaluate each species’ ecological niche, we leveraged a decade of recreational fisheries data, multi-year satellite tracking with high-resolution dive data, and stable isotope analysis. Fishery interaction and telemetry-based three-dimensional seasonal utilization distributions suggested high spatial and temporal overlap among species; however, seasonal and diel variability in diving behaviour produced spatial partitioning, leading to low trophic overlap among species. Expanding oxygen minimum zones will reduce the available vertical habitat within predator guilds, likely leading to increases in interspecific competition. Thus, understanding the mechanisms of habitat partitioning among predators in the vertically compressed ETP can provide insight into how predators in other ocean regions may respond to vertically limited habitats.
README: Data for: Seasonally mediated niche partitioning in a vertically compressed pelagic predator guild
Description of the data and file structure
Across all files, NA indicates no data were obtained for the given cell.
In "Logan et al_TimeSeries_DepthTemp.csv"
- Day - Date
- Ptt - Satellite tag ID number, unique for each individual
- Depth - depth in meters of the time series messages received
- DateTime - Date and Time of time series messages received
- Day1 - Date
- Hour - Hour of Day
- month - month of year
- time - value that increases daily for inclusion of time since tagging in models
- season - season of the year, based on month. Wet and Dry.
- tag_seaon - indicates which tagging year each fish was tagged in
- ascention - unique ID for each fish
In "Logan et al_IndividualDiveCharacterisitics.csv", each row holds information about 1 individual dive
- begdesc - date and time of when a dive descent began
- enddesc - date and time of when a dive descent ended
- begasc - date and time of when a dive ascent began
- botttim - duration (seconds) of time spent at the bottom phase of the dive
- divetim - duration (seconds) from the beginning of the descent to the end of the ascent
- bottdist - distance covered (meters) vertically during the bottom phase of a dive
- bottdep.mean - average depth (meters) of the bottom phase of the dive
- maxdep - maximum depth (meters) that was attained on the dive
- spp - Species (BUM = blue marlin, BAM = black marlin, SFA = sailfish)
- Ptt - unique tag ID for each fish
- Date - date the dive was performed on
- month - month of the year the dive was perfomed in
- season - season of the year the dive was perfomed in
In "Logan et al_3d_KUD_df.csv"
- Ptt - unique tag ID for each fish
- Date - date of the location estimate
- spp - Species (BUM = blue marlin, BAM = black marlin, SFA = sailfish)
- Lat - Latitude (decimal degrees) of the daily location estimate
- Lon - Longitude (decimal degrees) of the daily location estimate
- month - month of the year the of the location estimate
- season - season of the year of the location estimate
- max - maximum depth (meters) obtained for the day of the location estimate
In "Logan et al_SIA_data.csv"
- C13 - Carbon 13 isotope value
- N15 - Nitrogen 15 isotope value
- Short_Name - Species (BUM = blue marlin, BAM = black marlin, SFA = sailfish)
Sharing/Access information
please email the lead author, Ryan Logan, rklogn@gmail.com with any questions or for additional information/data.