Fig. 2: Spatial distributions of the Metabolic Index and species with distinct temperature sensitivities. | Nature

Fig. 2: Spatial distributions of the Metabolic Index and species with distinct temperature sensitivities.

From: Metabolic trait diversity shapes marine biogeography

Fig. 2

a, Northern shrimp (Pandalus borealis) from the north Atlantic, Pacific and Arctic Oceans. b, Small-spotted catshark (Scyliorhinus canicula) from the eastern Atlantic Ocean and Mediterranean Sea. c, Sea squirt (S. plicata), a cosmopolitan tunicate. The Metabolic Index is computed from monthly climatological measurements using the traits of each species, and averaged annually and over its longitudinal range in OBIS (http://iobis.org) for mapping (northern shrimp, 180°–45° E; catshark, 20° W–15° E; sea squirt, all longitudes). The species have similar hypoxia vulnerability (Vh, around 0.10–0.16 atm), but their temperature sensitivities (Eo) vary widely (northern shrimp, Eo ≈ 0.9; catshark, Eo ≈ 0.2; sea squirt, Eo ≈ −0.2) yielding different Φ gradients across latitude and depth. A single lower limit of Φ bounding each species range is contoured (Φcrit; black lines), along with climatological isotherms (grey lines, in °C) and observed species occurrences (blue dots) (Methods).

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