Temperature and land use influence tree swallow individual health.

However, few of these relationships were significant ( P < 0.05); a single model revealed a negative trend between haemoglobin concentration and terrestrial insect body size ( P = 0.093; Table 1 ; Fig. 1a ).

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Other than a positive trend between terrestrial insect body size and haemoglobin ( Table 1 ; Fig. 1a ), we did not observe significant associations or trends between insect prey availability and haematocrit and haemoglobin concentration, although these relationships have been observed for passerine birds previously ( Banbura et al. , 2007 ).

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