animal migration migration Ecology European bee-eater Haemoproteus Merops PAM logger Passer domesticus Passer hispaniolensis Plasmodium accelerometer aerobic scope annual cycle avian malaria avian moult energetics bird migration blood parasites breeding departure disease fitness flight performance food abundance geolocation geolocator group decision-making insects maximum metabolic rate metabolic rate migration ecology nocturnal migrant oxygen consumption parasitaemia pathogen phenology population dynamics pressure sensor primary productivity proxy remote sensing resting metabolic rate secondary productivity social interactions synchrony transmission of parasites wetland birds wintering