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Experimental manipulation of cavity temperature produces differential effects on parasite abundances in blue tit nests at two different latitudes - PubMed

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Experimental manipulation of cavity temperature produces differential effects on parasite abundances in blue tit nests at two different latitudes

Francisco Castaño-Vázquez et al. Int J Parasitol Parasites Wildl. 2021.

Abstract

Although different predictive models forecast that climate change will alter the distribution and incidence of parasitic diseases, few studies have investigated how microclimatic changes may affect host-parasite relationships. In this study, we experimentally increased the temperature inside nest boxes of the blue tit Cyanistes caeruleus during the nestling period at two different latitudes (central Spain and central Germany) to determine its effect on parasite abundance. The two localities have contrasting climate conditions: the southern one in Spain is warmer and drier than the northern one in Germany. Consistent with this, we observed that the parasitic fauna in nests at the two localities differs. The flea species Ceratophyllus gallinae was more abundant in the northern locality, while the blowfly species Protocalliphora azurea and biting midge species of the genus Culicoides were more abundant in the southern one, as were blood parasites. Moreover, dermanyssid mites and blackflies (Simuliidae) were observed only in the southern locality. The temperature inside nest boxes was increased using heat mats placed underneath the nest material during the nestling period (day 3 to day13 post-hatching). Compared with control nests, the average temperature in heated nests increased by 2.24 °C and 1.35 °C at night in Spain and Germany, respectively. Consequently, the average relative humidity in heated versus control nests decreased 4.93 and 0.82 units in Spain and Germany, respectively. The abundance of blowfly pupae in the heated nests was significantly lower than that of control nests at both localities. The abundance of larval fleas was also lower in the heated nests, but only at the Spanish locality. Infection by the blood parasites Haemoproteus/Plasmodium was higher in males attending the heated nests in Germany, and the control nests in Spain. Moreover, both male body mass and nestling wing length were negatively related to the abundance of larval fleas. In conclusion, our results indicate that increased temperature at the nestling stage may affect the fitness of blue tits by altering parasite prevalence rates.

Keywords: Latitude; Nest-dwelling ectoparasites; Relative humidity; Temperature.

© 2021 The Authors.

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Conflict of interest statement

There are no conflict of interest to declare for the manuscript entitled “Experimental manipulation of temperature produces differential effects on parasite abundances in blue tits at two different latitudes”, authored by F. Castaño-Vázquez, Y. R. Schumm, A. Bentele, P. Quillfeldt and Santiago Merino.

Figures

Image 1
Graphical abstract
Fig. 1
Fig. 1

Daily variation of temperature in nests of blue tits. Temperature is decreasing at 00:00 and lower values for the day are attained close to 8:00 h. Data from two different nests with nestling of 7 days old are represented from A) Spain and B) Germany.

Fig. 2
Fig. 2

Blowfly pupae abundance observed in control and heated nests of blue tits (Cyanistes caeruleus) in both localities (Spain and Germany). The data presented was controlled for the locality and the interaction between locality and treatment. Means ± intervals of confidence at 95% are shown.

Fig. 3
Fig. 3

Differences in the abundance of Haemoproteus/Plasmodium in blue tit males by treatment and locality. Means ± intervals of confidence at 95% are shown.

Fig. 4
Fig. 4

Differences in the body mass of adult blue tit males by heat treatment of nest boxes and locality. Means ± intervals of confidence at 95% are shown.

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