Latitudinal cline of ocean dependence in a diadromous fish

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 interspeci..., , , # Latitudinal cline of ocean dependence in a diadromous fish

[https://doi.org/10.5061/dryad.r7sqv9smz](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, y...