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Temperature gradient apparatuses. (a) The entire set up of thermoregulatory apparatus, showing insulating 2 × 4's and large Plexiglas covers. (b) View of the sphagnum moss interior and small Plexiglas window sealing each apparatus. (c) Heat tape gradient and bottom of apparatus showing the space where the aluminum meets the heat tape. (d) Ice packs and bottom of apparatus showing the space where the aluminum meets the ice packs.
