Nest attendance by tropical and temperate passerine birds: Same constancy, different strategy

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Nest attendance by tropical and temperate passerine birds : Same constancy, different strategy. / Austin, Suzanne H.; Robinson, William Douglas; Ellis, Vincenzo A.; Rodden Robinson, Tara; Ricklefs, Robert E.

In: Ecology and Evolution, Vol. 9, No. 23, 12.2019, p. 13555-13566.

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Austin, Suzanne H. ; Robinson, William Douglas ; Ellis, Vincenzo A. ; Rodden Robinson, Tara ; Ricklefs, Robert E. / Nest attendance by tropical and temperate passerine birds : Same constancy, different strategy. In: Ecology and Evolution. 2019 ; Vol. 9, No. 23. pp. 13555-13566.

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TY - JOUR

T1 - Nest attendance by tropical and temperate passerine birds

T2 - Same constancy, different strategy

AU - Austin, Suzanne H.

AU - Robinson, William Douglas

AU - Ellis, Vincenzo A.

AU - Rodden Robinson, Tara

AU - Ricklefs, Robert E.

PY - 2019/12

Y1 - 2019/12

N2 - Parental care in birds varies among species and geographic regions. Incubation behavior influences embryonic development rate and varies substantially among species. We studied attendance at the nest by videoing nests or collecting data from the literature for 112 species in north temperate and lowland tropical sites, then associated patterns of incubation on- and off-bouts with species and environmental traits. Songbirds nesting at low elevations incubate their eggs for an average of 74.1% (±12.9 SD, n = 60 species) of the time in temperate regions and 71.0% (±12.2 SD, n = 52 species) in tropical regions during daylight hours, and 84.3% (±8.2 SD) and 85.3% (±6.2 SD), respectively, of each 24-hr cycle. While these attendance percentages do not differ significantly between latitudes, our data also show that lowland tropical songbirds make fewer visits to the nest and, consequently, have longer on-bouts and off-bouts during incubation. This pattern in attendance reflects a latitudinal contrast in parental care strategy, where lowland tropical birds reduce visits to the nest by increasing on- and off-bout lengths while maintaining the same proportion of time spent incubating their eggs (constancy). Similar constancy across latitude suggests that tropical and temperate birds may be similarly constrained to maintain elevated egg temperatures for normal embryo growth. The different attendance strategies adopted in each region may reflect differences in ambient temperature, adult foraging time, and nest predation rate. Consistently warm ambient temperatures likely allow tropical birds to take longer off-bouts, and thereby to reduce activity around the nest, compared to temperate birds.

AB - Parental care in birds varies among species and geographic regions. Incubation behavior influences embryonic development rate and varies substantially among species. We studied attendance at the nest by videoing nests or collecting data from the literature for 112 species in north temperate and lowland tropical sites, then associated patterns of incubation on- and off-bouts with species and environmental traits. Songbirds nesting at low elevations incubate their eggs for an average of 74.1% (±12.9 SD, n = 60 species) of the time in temperate regions and 71.0% (±12.2 SD, n = 52 species) in tropical regions during daylight hours, and 84.3% (±8.2 SD) and 85.3% (±6.2 SD), respectively, of each 24-hr cycle. While these attendance percentages do not differ significantly between latitudes, our data also show that lowland tropical songbirds make fewer visits to the nest and, consequently, have longer on-bouts and off-bouts during incubation. This pattern in attendance reflects a latitudinal contrast in parental care strategy, where lowland tropical birds reduce visits to the nest by increasing on- and off-bout lengths while maintaining the same proportion of time spent incubating their eggs (constancy). Similar constancy across latitude suggests that tropical and temperate birds may be similarly constrained to maintain elevated egg temperatures for normal embryo growth. The different attendance strategies adopted in each region may reflect differences in ambient temperature, adult foraging time, and nest predation rate. Consistently warm ambient temperatures likely allow tropical birds to take longer off-bouts, and thereby to reduce activity around the nest, compared to temperate birds.

KW - incubation

KW - latitudinal gradient

KW - life-history evolution

KW - parental care

KW - passerine birds

U2 - 10.1002/ece3.5812

DO - 10.1002/ece3.5812

M3 - Article

VL - 9

SP - 13555

EP - 13566

JO - Ecology and Evolution

JF - Ecology and Evolution

SN - 2045-7758

IS - 23

ER -