Latitudinal cline of ocean dependence in a diadromous fish
Data files
Dec 22, 2024 version files 76.22 KB
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GrowthData.csv
63.03 KB
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IndividualData.csv
11.73 KB
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README.md
1.46 KB
Abstract
Diadromous fishes exhibit latitudinal clines of ocean dependency at inter- and intra-species levels. A pattern of ocean dependence at high latitudes and river dependence at low latitudes is explained by relative aquatic productivity. Such latitudinal productivity clines may induce geographical variations in life-history diversity within migratory phenotypes. We hypothesised that the lifetime ocean dependency of a regional migratory salmonid would display a latitudinal cline that increased at higher latitudes. Freshwater growth rate decreased with higher latitudes, whereas marine growth rate was independent of latitude. The percentage adult weight gain at sea was higher at higher latitudes. Relative weight gain [ln(ocean weight gain/freshwater weight gain)] decreased to zero at lower latitudes, indicating no growth benefit of going to sea at the southern distribution limit. These latitudinal variations in life history within salmonid migrants are consistent with the intra- and interspecific patterns and provide insight into the origin of diadromous migration, but raise the question of whether the current definition of anadromy may be insufficient to fully capture the complexity and continuum of river-ocean migrations.
README: Latitudinal cline of ocean dependence in a diadromous fish
https://doi.org/10.5061/dryad.r7sqv9smz
Description of the data and file structure
The dataset of anadromous white-spotted charr Salvelinus leucomaenis collected from 16 rivers in north Japan contains three files; IndividualData, GrowthData, and Rcode.
Files and variables
File: IndividualData.csv
Description:
IndividualData contains sample No, Date (YYYY/M/DD), Station No (St), River, Latitude (°N), Sex (f: female, m: male), Fork length (FL, mm), Body weight (BW, g), age (year), feeding or not (Vacuity, 1:feeding, 0:not feeding), otolith radius at capture (O_capture, μm), otolith radius at smolting (O_smolt, μm), smolt_FL (mm), smolt_BW (g), smolt_age (year), marine weight gain (%) and relative weight gain.
File: GrowthData.csv
Description:
GrowthData contains sample No, River, Latitude (°N), Sex (f: female, m: male), smolt_age (year), age (t, year), otolith radius at age t (Ot, μm), fork length at age t (Lt, mm), body weight at age t (BWt, g), fork length at age t+1 (Lt+1, mm), body weight at age t+1 (BWt+1, g), ΔLt (mm), ΔBWt (g), habitat at age t (habitat_t), and habitat at age t+1 (habitat_t+1).
File: Rcode_Goto_etal.R
Description:
The R code used for analysis and graphing is provided. Please load and use the two CSV files, IndividualData.csv and GrowthData.csv.