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2017 ; 71
(12
): 171
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The use of the nest for parental roosting and thermal consequences of the nest
for nestlings and parents
#MMPMID29170593
Nilsson JÅ
; Nord A
Behav Ecol Sociobiol
2017[]; 71
(12
): 171
PMID29170593
show ga
ABSTRACT: At temperate latitudes, altricial birds and their nestlings need to
handle night temperatures well below thermoneutrality during the breeding season.
Thus, energy costs of thermoregulation might constrain nestling growth, and low
nocturnal temperatures might require resources that parents could otherwise have
invested into nestlings during the day. To manipulate parental work rate, we
performed brood size manipulations in breeding marsh tits (Poecile palustris).
Nest box temperatures were always well above ambient temperature and increased
with increasing brood size. In line with predictions, a large majority of females
(but no males) made use of this benign environment for roosting. Furthermore,
females tending enlarged broods, thereby having to work harder during the day,
reduced their body temperature at night. This might have reduced nocturnal energy
expenditure. Our finding that a higher proportion of enlarged, as compared to
control, females continued to use the nest box as roosting sites even after a
simulated predation event despite increased vulnerability to predation, further
highlighting the need for energy conservation in this group. High nest box
attendance and reduced body temperature in brood-reduced females may indicate
that these females prioritised self-maintenance by initiating other costly
physiological adjustments, e.g. moult, when relieved from parental work. We
suggest that the energy demand for defending homeothermy is an element of the
general trade-off between current and future reproduction, i.e. between daytime
investment in food provisioning and the potential short- and long-term costs of a
reduction in body temperature and increased predation risk. SIGNIFICANCE
STATEMENT: Even during summer at temperate latitudes, breeding birds need to use
energy to maintain stable body temperature. Parents, thus, need to enter the
night with sufficient body reserves to cover energy requirements for
thermoregulation. As these resources could be used for feeding nestling during
the day, adaptations to reduce the cost of thermoregulation would be selected
for. We performed brood size manipulations, thereby increasing the need for
nestling provisioning in marsh tits (Parus palustris). We found that females
typically spent the night in the thermally benign environment of the nest box
together with their brood. Females working hard during the day continued to roost
in the nest box during the night despite an increase in the perceived risk of
nest predation. Furthermore, these females reduced their body temperature at
night, thereby reducing the gradient between ambient and body temperature,
further reducing the cost of thermoregulation.