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Artículos de revistas sobre el tema "Song sparrow Song sparrow Bird populations"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 4 de febrero de 2022

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1

Girard, J., A. Baril, P. Mineau, and L. Fahrig. "Foraging habitat and diet of Song Sparrows (Melospiza melodia) nesting in farmland: a stable isotope approach." Canadian Journal of Zoology 90, no. 11 (2012): 1339–50. http://dx.doi.org/10.1139/z2012-103.

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Agricultural intensification has been linked to declines in farmland and grassland bird populations in Europe and in North America. One factor thought to be behind these declines is reduced invertebrate food abundance in the breeding season, leading to reduced reproductive success. However, little is known about foraging habitat or diet of farmland birds in North America. We used stable isotopes to study foraging habitat and diet of Song Sparrows ( Melospiza melodia (A. Wilson, 1810)), a common hedgerow-breeding bird, by collecting claw clippings of Song Sparrow nestlings from farms in eastern

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2

Sung, Ha-Cheol, and Paul Handford. "Song characters as reliable indicators of male reproductive quality in the Savannah Sparrow (Passerculus sandwichensis)." Canadian Journal of Zoology 98, no. 1 (2020): 32–38. http://dx.doi.org/10.1139/cjz-2019-0018.

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Bird song may provide female birds with signals of male quality. To investigate this potential for sexual selection via female choice, we assessed the relationships between male song variation and male mating and reproductive success of the Savannah Sparrow (Passerculus sandwichensis (J.F. Gmelin, 1789)) over 3 years (2001–2003) in a population of Savannah Sparrows near London, Ontario, Canada. We measured song rate, as well as temporal and frequency attributes of song structure, as possible predictors of male quality, and then related these measures to attributes of male reproductive performa

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3

Liu, Wan-Chun, and Donald E. Kroodsma. "Song Learning by Chipping Sparrows: When, Where, and From Whom." Condor 108, no. 3 (2006): 509–17. http://dx.doi.org/10.1093/condor/108.3.509.

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Abstract Given the difficulty of following free-living, dispersing juvenile songbirds, relatively little is known about when, where, how, and from whom these young birds learn their songs. To explore these issues, we studied the Chipping Sparrow (Spizella passerina), males of which have a single, simple song, but populations of which may contain 20–30 different songs. In our western Massachusetts study sites, we color-banded 324 nestling and 32 fledgling sparrows. Twelve of these banded males returned to our study areas, dispersing a few hundred meters to 1.8 km away from their natal territori

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4

Sung, Ha-Cheol, and Paul Handford. "Songs of the Savannah Sparrow: structure and geographic variation." Canadian Journal of Zoology 84, no. 11 (2006): 1637–46. http://dx.doi.org/10.1139/z06-159.

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We investigated song structure and the pattern of geographic variation at the syllable and whole song levels in Savannah Sparrow, Passerculus sandwichensis (J.F. Gmelin, 1789). Songs were recorded for 179 males from eight sample populations distributed along a 230 km transect in southwestern Ontario in 2000. Subsequent analysis included measurement and comparison of structural song features and qualitative analysis of syllable and song type similarity among individuals both within and among populations, by reference to a syllable catalogue based on syllable similarity. Song type sharing within

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5

Searcy, William, Rindy Anderson, and Stephen Nowicki. "Testing the function of song-matching in birds: responses of eastern male song sparrows Melospiza melodia to partial song-matching." Behaviour 145, no. 3 (2008): 347–63. http://dx.doi.org/10.1163/156853908783402876.

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AbstractSong-matching has been hypothesized to be a signal of aggressive intentions whereby matching an opponent signals that the singer is likely to attack. Theory predicts that an aggressive signal should impose a cost that enforces the signal's reliability. A receiver-dependent cost imposed by the matched bird's aggressive retaliation has been proposed for song-matching. We tested for such a cost for partial song-matching in an eastern population of song sparrows where males lack the shared song types necessary for song type matching, but can perform partial song-matching using shared song

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6

Sandercock, Brett K., and Alvaro Jaramillo. "Annual Survival Rates of Wintering Sparrows: Assessing Demographic Consequences of Migration." Auk 119, no. 1 (2002): 149–65. http://dx.doi.org/10.1093/auk/119.1.149.

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AbstractThe demographic consequences of migration have important implications for both evolutionary ecology and conservation biology. We investigated local survival rates for six populations of sparrows at a wintering site. Recent developments in mark–recapture statistics were applied to a 13 year dataset with large numbers of marked individuals (n = 1,632 to 4,394). The study taxa were closely related, and included one resident species (Song Sparrow [Melospiza melodia gouldii]), one short-distance migrant (“Puget Sound” White-crowned Sparrow [Zonotrichia leucophrys pugetensis]), two moderate-

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7

Nelson, Douglas, Hitesh Khanna, and Peter Marler. "LEARNING BY INSTRUCTION OR SELECTION: IMPLICATIONS FOR PATTERNS OF GEOGRAPHIC VARIATION IN BIRD SONG." Behaviour 138, no. 9 (2001): 1137–60. http://dx.doi.org/10.1163/156853901753287172.

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AbstractExperience can have both instructive and selective effects on vocal development in song birds. Learning by instruction occurs when one male imitates the song of another. Learning by selection occurs when a male chooses one or more songs to retain in his repertoire based on interaction with other individuals. These models of learning make different predictions about the degree of microgeographic variation in song present in wild populations of birds. If males are instructed by their immediate territory neighbors, then the songs of territory neighbors should be more similar than are the

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8

Zimmerman, Hannah D., Scott M. Ramsay, Veronica Mesias, Marcelo Mora, Brent W. Murray, and Ken A. Otter. "Evolution of white-throated sparrow song: regional variation through shift in terminal strophe type and length." Behaviour 153, no. 15 (2016): 1839–61. http://dx.doi.org/10.1163/1568539x-00003394.

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We investigated the emergence over time of a novel song variant (doublet-ending song) in a western Canadian sub-population of white-throated sparrows; this variant differs from the species-typical, triplet-ending song. By analysing recent (1999–2014) and historic (1950/1960s) recordings, we show that populations west (British Columbia) and immediately east (Alberta) of the Rockies, and from central Canada (Ontario) initially all had triplet-ending songs. The shift to doublet-ending songs first arose west of the Rockies, and has increased immediately east of the Rockies in the last decade. The

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9

Nelson, Douglas A., Ben M. Nickley, Angelika Poesel, H. Lisle Gibbs, and John W. Olesik. "Inter-dialect dispersal is common in the Puget Sound white-crowned sparrow." Behaviour 154, no. 7-8 (2017): 809–34. http://dx.doi.org/10.1163/1568539x-00003445.

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Dispersal in birds can have an important influence on the genetic structure of populations by affecting gene flow. In birds that learn their songs, dispersal can affect the ability of male birds to share songs in song dialects and may influence mate attraction. We used Inductively Coupled Plasma Mass Spectrometry (ICP-MS) trace element analysis on the body feathers of birds to assess dispersal among four song dialects. We found that (1) most males had a feather element profile typical of only one dialect location; (2) males singing non-local (‘foreign’) dialects in a focal population often lea

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10

Greenberg, Russell, and Raymond M. Danner. "Climate, ecological release and bill dimorphism in an island songbird." Biology Letters 9, no. 3 (2013): 20130118. http://dx.doi.org/10.1098/rsbl.2013.0118.

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Sexual size dimorphism is expected to be more pronounced in vertebrates on islands, particularly in trophic characters, as a response to decreased interspecific competition for food. We found (based on measurements of 1423 museum specimens) that bill size dimorphism was greater in island than mainland populations of song sparrows. However, dimorphism varied among islands and was positively correlated with high summer temperature and island size. Island song sparrow bills follow the overall positive temperature bill size relationship for California song sparrows, which includes larger bills on

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11

Bell, Douglas, Hans Slabbekoorn, and Andrea Jesse. "Microgeographic song variation in island populations of the white-crowned sparrow (Zonotrichia leucophrys nutalli): innovation through recombination." Behaviour 140, no. 7 (2003): 947–63. http://dx.doi.org/10.1163/156853903770238409.

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AbstractCurrent geographic variation in bird song dialects may be used to infer historical processes involved in dialect formation. Discrete island populations, separated by water or unsuitable habitat, may be particularly useful as they allow for unequivocal subdivision of populations. We analyzed song recordings of nine populations of the white-crowned sparrow within the San Francisco Bay area, both on 'true' islands separated by water and in habitat islands along the Bay shore. We found one or two unique songtypes in each population with little variation within songtypes among individuals.

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12

Moseley, Dana L., Jennifer N. Phillips, Elizabeth P. Derryberry, and David A. Luther. "Evidence for differing trajectories of songs in urban and rural populations." Behavioral Ecology 30, no. 6 (2019): 1734–42. http://dx.doi.org/10.1093/beheco/arz142.

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Abstract Learned traits, such as foraging strategies and communication signals, can change over time via cultural evolution. Using historical recordings, we investigate the cultural evolution of birdsong over nearly a 50-year period. Specifically, we examine the parts of white-crowned sparrow (Zonotrichia leucophrys nuttalli) songs used for mate attraction and territorial defense. We compared historical (early 1970s) recordings with contemporary (mid-2010s) recordings from populations within and near San Francisco, CA and assessed the vocal performance of these songs. Because birds exposed to

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13

Lein, M. Ross, and Kendall W. Corbin. "Song and plumage phenotypes in a contact zone between subspecies of the White-crowned Sparrow (Zonotrichia leucophrys)." Canadian Journal of Zoology 68, no. 12 (1990): 2625–29. http://dx.doi.org/10.1139/z90-366.

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We examined the transitions in a plumage character (lore color) and a learned behavioral character (song pattern) across a 400 -km intergrade zone between two subspecies of the White-crowned Sparrow (Zonotrichia leucophrys) in southwestern Alberta. The proportion of birds with black lores, characteristic of Z. l. oriantha, shifted gradually from over 80% in southernmost localities to less than 20% at the northern end of the zone, where most individuals had grey lores, characteristic of Z. l. gambelii. The song pattern of males also showed a complete transition across the zone, but the change w

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14

Louha, Swarnali, David A. Ray, Kevin Winker, and Travis C. Glenn. "A High-Quality Genome Assembly of the North American Song Sparrow, Melospiza melodia." G3: Genes|Genomes|Genetics 10, no. 4 (2020): 1159–66. http://dx.doi.org/10.1534/g3.119.400929.

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The song sparrow, Melospiza melodia, is one of the most widely distributed species of songbirds found in North America. It has been used in a wide range of behavioral and ecological studies. This species’ pronounced morphological and behavioral diversity across populations makes it a favorable candidate in several areas of biomedical research. We have generated a high-quality de novo genome assembly of M. melodia using Illumina short read sequences from genomic and in vitro proximity-ligation libraries. The assembled genome is 978.3 Mb, with a physical coverage of 24.9×, N50 scaffold size of 5

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15

Blackburn, Tim, Melanie Monroe, Becki Lawson, Cassey Phill, and John Ewen. "Body size changes in passerine birds introduced to New Zealand from the UK." NeoBiota 17 (June 28, 2013): 1–18. http://dx.doi.org/10.3897/neobiota.7.4841.

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One feature of global geographic variation in avian body sizes is that they are larger on isolated islands than on continental regions. Therefore, this study aims to assess whether there have been changes in body size following successful establishment for seven passerine bird species (blackbird Turdus merula, song thrush Turdus philomelos, house sparrow Passer domesticus, chaffinch Fringilla coelebs, greenfinch Chloris chloris, goldfinch Carduelis carduelis, yellowhammer Emberiza citrinella) introduced from the continental islands of the UK to the more isolated oceanic landmass of New Zealand

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16

Flux, John E. C. "Comparison of predation by two suburban cats in New Zealand." European Journal of Ecology 3, no. 1 (2017): 85–90. http://dx.doi.org/10.1515/eje-2017-0009.

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AbstractTo study the effects domestic cats may have on surrounding wildlife, a complete list was made of 558 items caught in the garden or brought into the house by one cat over 17 years, from 1988 to 2005. The effect on prey populations was assessed by comparing their abundance with the previous 15 years’ population without a cat. On balance, this cat (Cat 1) was clearly beneficial to the native bird species by killing rodents and deterring mustelids. The diet of a second cat (Cat 2) was recorded in the same way from 2006 to 2016. This cat caught half the number of items 148:287, but in the s

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17

Stoddard, Philip K., Michael D. Beecher, S. Elizabeth Campbell, and Cynthia L. Horning. "Song-type matching in the song sparrow." Canadian Journal of Zoology 70, no. 7 (1992): 1440–44. http://dx.doi.org/10.1139/z92-200.

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Song playback to song sparrows (Melospiza melodia) in a resident population in Washington state showed that the tendency of birds to respond with the same song type (match) depended on the identity of the singer. Matching rates were high to 'self song (60%) and 'stranger' song (50%) and low to 'neighbor' song (20%, not significantly above chance level). The higher matching rate to stranger song was particularly interesting, since the neighbor test songs were generally more similar to the subjects' songs than were the stranger test songs (the self songs, of course, were the most similar). The i

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18

Flesch, Aaron D., and Antonio Esquer. "Impacts of Riparian Restoration on Vegetation and Avifauna on Private and Communal Lands in Northwest Mexico and Implications for Future Efforts." Air, Soil and Water Research 13 (January 2020): 117862212093806. http://dx.doi.org/10.1177/1178622120938060.

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Restoring and enhancing riparian vegetation on private and communal lands in Mexico is important for biodiversity conservation given the ecological significance of these areas and the scarcity of public protected areas. To enhance riparian vegetation and wildlife habitats and train local people in restoration techniques, we implemented restoration and outreach efforts on private and communal lands in the Sky Islands region of northwest Mexico. We fenced 475 ha of riparian zones from livestock, erected erosion-control structures, planted trees, and developed management agreements for cool-seaso

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19

Derryberry, Elizabeth P. "Male response to historical and geographical variation in bird song." Biology Letters 7, no. 1 (2010): 57–59. http://dx.doi.org/10.1098/rsbl.2010.0519.

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In many species, individuals discriminate among sexual signals of conspecific populations in the contexts of mate choice and male–male competition. Differences in signals among populations (geographical variation) are in part the result of signal evolution within populations (temporal variation). Understanding the relative effect of temporal and geographical signal variation on signal salience may therefore provide insight into the evolution of behavioural discrimination. However, no study, to my knowledge, has compared behavioural response to historical signals with response to current signal

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20

Wood, William E., and Stephen M. Yezerinac. "Song Sparrow (Melospiza Melodia) Song Varies with Urban Noise." Auk 123, no. 3 (2006): 650–59. http://dx.doi.org/10.1093/auk/123.3.650.

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Abstract In urban environments, anthropogenic noise may mask bird song, especially the notes occurring at lower frequencies (1–2 kHz). Birds living in urban environments may modify their songs, particularly the low-frequency portions, to minimize masking by anthropogenic noise. Such modifications have been observed in Great Tits (Parus major) in The Netherlands, as well as in some mammals. We studied Song Sparrows (Melospiza melodia), which are common in both urban and rural environments in much of North America, and recorded the songs of 28 free- living males in Portland, Oregon. We also meas

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21

Nelson, Douglas. "Geographic Variation in Song of Gambel's White-Crowned Sparrow." Behaviour 135, no. 3 (1998): 321–42. http://dx.doi.org/10.1163/156853998793066258.

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AbstractWhite-crowned sparrow (Zonotrichia leucophrys) song varies geographically, often forming local 'dialects' in sedentary and short-distance migratory subspecies. In playback experiments males and females can distinguish this variation. Gambel's white-crowned sparrow (Z. L. gambelii) is a long-distance migrant that breeds across subarctic Canada and Alaska. Previous studies identified a wide degree of song variation within local populations of this subspecies. I compared songs recorded in Alaska and Churchill, Manitoba, and found significant differences in acoustic structure. As in other

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22

Peters, Susan, William A. Searcy, Michael D. Beecher, and Stephen Nowicki. "Geographic Variation in the Organization of Song Sparrow Repertoires." Auk 117, no. 4 (2000): 936–42. http://dx.doi.org/10.1093/auk/117.4.936.

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Abstract We asked whether geographic variation exists in the complexity of song repertoires in Song Sparrows (Melospiza melodia) by quantitatively comparing four measures of repertoire organization across four geographically distant populations: (1) repertoire size (the number of distinct song types), (2) the number of “minimal units of production” per repertoire, (3) mean similarity among variants of the same song type (“within-type” similarity), and (4) mean similarity among song types in a repertoire (“between-type” similarity). We found significant geographic differences among populations

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23

Cicero, Carla, and Morgan Benowitz-Fredericks. "Song Types and Variation in Insular Populations of Lincoln's Sparrow (Melospiza Lincolnii), and Comparisons With Other Melospiza." Auk 117, no. 1 (2000): 52–64. http://dx.doi.org/10.1093/auk/117.1.52.

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Abstract In contrast to the Swamp Sparrow (Melospiza georgiana) and Song Sparrow (M. melodia), vocal studies of the congeneric Lincoln's Sparrow (M. lincolnii) are essentially lacking. To provide comparative data on song variation in this species, we obtained and analyzed recordings from 58 males (4,537 songs) breeding in montane meadows of the Sierra Nevada and San Bernardino Mountains, California. Males sang from one to six song types, and repertoire size averaged 3.7 types. No two males shared an identical song type. Males varied their types by changing the number of repetitions of a syllab

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24

Scales, Jennifer, Jeremy Hyman, and Melissa Hughes. "Behavioral Syndromes Break Down in Urban Song Sparrow Populations." Ethology 117, no. 10 (2011): 887–95. http://dx.doi.org/10.1111/j.1439-0310.2011.01943.x.

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Foote, Jennifer R., and Colleen A. Barber. "High Level of Song Sharing in an Eastern Population of Song Sparrow (Melospiza Melodia)." Auk 124, no. 1 (2007): 53–62. http://dx.doi.org/10.1093/auk/124.1.53.

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Abstract Using shared songs is believed to be an integral part of neighbor communication and territory establishment strategies among many avian species with repertoires. Previous studies of two western subspecies of Song Sparrows (Melospiza melodia) reported a high level of song sharing among neighboring males, whereas studies of an eastern subspecies have reported a very low level. The purpose of our study was to investigate another population of the eastern subspecies to determine whether higher song-sharing levels existed within its range. Every song in the repertoire of 29 males was compa

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PRUETT, CHRISTIN L., and KEVIN WINKER. "Northwestern song sparrow populations show genetic effects of sequential colonization." Molecular Ecology 14, no. 5 (2005): 1421–34. http://dx.doi.org/10.1111/j.1365-294x.2005.02493.x.

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Wilson, Pamela L., Mary C. Towner, and Sandra L. Vehrencamp. "Survival and Song-Type Sharing in a Sedentary Subspecies of the Song Sparrow." Condor 102, no. 2 (2000): 355–63. http://dx.doi.org/10.1093/condor/102.2.355.

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AbstractThe extent and spatial pattern of song-type sharing among neighboring males in one subspecies of Song Sparrow, Melospiza melodia cooperi, were examined in two San Diego County populations. Repertoire size averaged 9.6 song types per male (range 7 to 14). Song-type sharing was greatest between neighbors and declined with distance between territories. Adjacent neighbors shared an average of 22% of their song types. Variation in the amount of sharing between adjacent territory owners was high, ranging from 0% to 86% repertoire overlap. Results are consistent with the expected pattern prod

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28

Nelson, Douglas A., Erica Szeyller, and Angelika Poesel. "Alerting and message components of white-crowned sparrow song differ in structure and environmental transmission." Behaviour 153, no. 3 (2016): 263–85. http://dx.doi.org/10.1163/1568539x-00003341.

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Signals that function over long distances, such as bird songs, must be detectable and discriminable from other signals by receivers despite being attenuated and degraded during environmental transmission. The acoustic design features that enhance detectability may conflict with those that enhance discriminability of different messages (e.g., the sender’s motivation or identity). The songs of many bird species begin with simple tonal notes, hypothesized to alert receivers to the following song parts. We describe structural differences in the songs of the Puget Sound white-crowned sparrow (Zonot

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Postma, Erik, Franziska Heinrich, Ursina Koller, et al. "Disentangling the effect of genes, the environment and chance on sex ratio variation in a wild bird population." Proceedings of the Royal Society B: Biological Sciences 278, no. 1720 (2011): 2996–3002. http://dx.doi.org/10.1098/rspb.2010.2763.

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Sex ratio theory proposes that the equal sex ratio typically observed in birds and mammals is the result of natural selection. However, in species with chromosomal sex determination, the same 1 : 1 sex ratio is expected under random Mendelian segregation. Here, we present an analysis of 14 years of sex ratio data for a population of song sparrows ( Melospiza melodia ) on Mandarte Island, at the nestling stage and at independence from parental care. We test for the presence of variance in sex ratio over and above the binomial variance expected under Mendelian segregation, and thereby quantify t

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Morrell, N., K. M. Johnson, C. E. Tarwater, and P. Arcese. "Nest defense and parental investment in Song Sparrows (Melospiza melodia)." Canadian Journal of Zoology 94, no. 7 (2016): 473–77. http://dx.doi.org/10.1139/cjz-2016-0042.

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Individual variation in nest defense behaviour is common in altricial birds, but despite clear predictions about why such variation exists, there is no consensus on its causes. We tested for an influence of five predictors of individual variation in nest defense behaviour, including time of season, offspring age, parental age and sex, and clutch size in a well-studied Song Sparrow (Melospiza melodia (A. Wilson, 1810)) population. We recorded parental responses to a standardized human approach and used model selection to assess support for each predictor. Parents tended to approach observers le

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Sarquis-Adamson, Yanina, and Elizabeth A. MacDougall-Shackleton. "Song sparrows Melospiza melodia have a home-field advantage in defending against sympatric malarial parasites." Royal Society Open Science 3, no. 8 (2016): 160216. http://dx.doi.org/10.1098/rsos.160216.

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Hosts and parasites interact on both evolutionary and ecological timescales. The outcome of these interactions, specifically whether hosts are more resistant to their local parasites (sympatric) than to parasites from another location (allopatric), is likely to affect the spread of infectious disease and the fitness consequences of host dispersal. We conducted a cross-infection experiment to determine whether song sparrows ( Melospiza melodia ) have an advantage in dealing with sympatric parasites. We captured birds from two breeding sites 437 km apart, and inoculated them with avian malaria (

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Avelino, Márcio F., and Jacques M. E. Vielliard. "Comparative analysis of the song of the Rufous-collared Sparrow Zonotrichia capensis (Emberizidae) between Campinas and Botucatu, São Paulo State, Brazil." Anais da Academia Brasileira de Ciências 76, no. 2 (2004): 345–49. http://dx.doi.org/10.1590/s0001-37652004000200023.

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The regional dialects or regiolects of the Rufous-collared Sparrow Zonotrichia capensis were compared between Campinas (47º06'W-22º90'S) and Botucatu (48º44'W-22º88'S), São Paulo State, Southeastern Brazil. Songs of 88 individuals from thirteen localities were recorded. Sonograms showed that two areas presented more homogeneous songs, forming two regiolects. In 11 localities most individuals shared the same song type. At the other two localities, they sang up to 5 different song types. This occurs at the boundaries of the regiolects, and was also where individuals singing more than one song ty

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Ellison, Anne Margaret, and Ron Ydenberg. "Risk allocation: acute and chronic predator exposure have contrasting effects on Song Sparrow (Melospiza melodia) singing behaviour." Canadian Journal of Zoology 97, no. 3 (2019): 258–66. http://dx.doi.org/10.1139/cjz-2018-0147.

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Increasing the danger posed by predators may cause prey animals to alter their behaviour. For example, they may be more vigilant and so feed more slowly. Breeding male Song Sparrows (Melospiza melodia (A. Wilson, 1810)) spend much time in conspicuous, loud song, which is an important behaviour for territorial defense and for mate attraction. We measured their singing behaviour in relation to both chronic (active Cooper’s Hawk (Accipiter cooperii (Bonaparte, 1828)) nest nearby) and acute (playback of hawk calls) predator exposure. We found that proximity to a Cooper’s Hawk nest had little or no

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York, Jennifer E., Andrew J. Young, and Andrew N. Radford. "Singing in the moonlight: dawn song performance of a diurnal bird varies with lunar phase." Biology Letters 10, no. 1 (2014): 20130970. http://dx.doi.org/10.1098/rsbl.2013.0970.

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It is well established that the lunar cycle can affect the behaviour of nocturnal animals, but its potential to have a similar influence on diurnal species has received less research attention. Here, we demonstrate that the dawn song of a cooperative songbird, the white-browed sparrow weaver ( Plocepasser mahali ), varies with moon phase. When the moon was above the horizon at dawn, males began singing on average 10 min earlier, if there was a full moon compared with a new moon, resulting in a 67% mean increase in performance period and greater total song output. The lack of a difference betwe

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Beaulieu, Michaël, and Keith W. Sockman. "Song in the cold is ‘hot’: memory of and preference for sexual signals perceived under thermal challenge." Biology Letters 8, no. 5 (2012): 751–53. http://dx.doi.org/10.1098/rsbl.2012.0481.

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The environmental conditions under which signals are perceived can affect receiver responses. Many songbird populations produce a song chorus at dawn, when, in cold habitats, they would experience thermal challenge. We recorded temperature and the song activity of Lincoln's sparrows ( Melospiza lincolnii ) on a high-elevation meadow, and determined that song behaviour is concentrated around the coldest time of the day, at dawn. We hypothesized that this is because male song in the cold is more attractive to females than song in the warm. To test this, we exposed laboratory-housed Lincoln's spa

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Osugi, T., K. Ukena, GE Bentley, et al. "Gonadotropin-inhibitory hormone in Gambel's white-crowned sparrow (Zonotrichia leucophrys gambelii): cDNA identification, transcript localization and functional effects in laboratory and field experiments." Journal of Endocrinology 182, no. 1 (2004): 33–42. http://dx.doi.org/10.1677/joe.0.1820033.

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The neuropeptide control of gonadotropin secretion is primarily through the stimulatory action of the hypothalamic decapeptide, GnRH. We recently identified a novel hypothalamic dodecapeptide with a C-terminal LeuPro-Leu-Arg-Phe-NH2 sequence in the domestic bird, Japanese quail (Coturnix japonica). This novel peptide inhibited gonadotropin release in vitro from the quail anterior pituitary; thus it was named gonadotropin-inhibitory hormone (GnIH). GnIH may be an important factor regulating reproductive activity not only in domesticated birds but also in wild, seasonally breeding birds. Thus, w

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Poesel, Angelika, Anthony C. Fries, Lisa Miller, H. Lisle Gibbs, Jill A. Soha, and Douglas A. Nelson. "High levels of gene flow among song dialect populations of the Puget Sound white-crowned sparrow." Ethology 123, no. 9 (2017): 581–92. http://dx.doi.org/10.1111/eth.12632.

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Chan, Yvonne, and Peter Arcese. "Subspecific Differentiation and Conservation of Song Sparrows (Melospiza Melodia) in the San Francisco Bay Region Inferred by Microsatellite Loci Analysis." Auk 119, no. 3 (2002): 641–57. http://dx.doi.org/10.1093/auk/119.3.641.

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Abstract We examined genetic population structure of five putative subspecies of Song Sparrows (Melospiza melodia) in the San Francisco Bay region (M. m. samuelis, M. m. maxillaris, M. m. pusillula, M. m. gouldii, and M. m. heermanni) at nine microsatellite loci to assist the development of Song Sparrow conservation and management strategies. We sampled nine populations from five putative subspecies and found low estimates of differentiation between populations within subspecies and between. Despite low estimates of divergence, genetic structure at the subspecies level was indicated by the lar

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Wilson, Scott, and Peter Arcese. "Nest Depredation, Brood Parasitism, and Reproductive Variation in Island Populations of Song Sparrows (Melospiza Melodia)." Auk 123, no. 3 (2006): 784–94. http://dx.doi.org/10.1093/auk/123.3.784.

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Abstract Theory suggests that the persistence of metapopulations will be influenced by the degree of synchrony in the dynamics of their component populations. Various studies have shown that climate can promote synchrony in the size of adjacent populations linked by dispersal, but fewer studies have examined the effects of climate on underlying demographic rates. We studied annual variation in the timing of breeding and reproductive rates in Song Sparrow (Melospiza melodia) on islands linked by dispersal to determine whether biotic factors acting at local scales or climatic factors acting at a

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40

Nietlisbach, Pirmin, Lukas F. Keller, Glauco Camenisch, et al. "Pedigree-based inbreeding coefficient explains more variation in fitness than heterozygosity at 160 microsatellites in a wild bird population." Proceedings of the Royal Society B: Biological Sciences 284, no. 1850 (2017): 20162763. http://dx.doi.org/10.1098/rspb.2016.2763.

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Although the pedigree-based inbreeding coefficient F predicts the expected proportion of an individual's genome that is identical-by-descent (IBD), heterozygosity at genetic markers captures Mendelian sampling variation and thereby provides an estimate of realized IBD. Realized IBD should hence explain more variation in fitness than their pedigree-based expectations, but how many markers are required to achieve this in practice remains poorly understood. We use extensive pedigree and life-history data from an island population of song sparrows ( Melospiza melodia ) to show that the number of g

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41

Wang, Gang, Clifford E. Harpole, Jiffin Paulose, and Vincent M. Cassone. "The role of the pineal gland in the photoperiodic control of bird song frequency and repertoire in the house sparrow, Passer domesticus." Hormones and Behavior 65, no. 4 (2014): 372–79. http://dx.doi.org/10.1016/j.yhbeh.2014.02.008.

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42

Pruett, Christin L., Angela Ricono, Cory Spern, and Kevin Winker. "Island life and isolation: The population genetics of Pacific Wrens on the North Pacific Rim." Condor 119, no. 1 (2017): 131–42. http://dx.doi.org/10.1650/condor-16-183.1.

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Abstract Conservation of intraspecific variation is a growing focus of conservation biology. Island populations can make up a large portion of the variation of widespread species, as they are often isolated and exhibit differences in phenotype and genetic structure compared with mainland populations. We genotyped 169 Pacific Wrens (Troglodytes pacificus) from 9 locations and 6 subspecies in Alaska, USA, and British Columbia, Canada, to examine the population structure, genetic diversity, and likelihood of genetic rescue of island populations of conservation concern. We found that 25% of geneti

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Myers, Rachel Elizabeth, and Jeremy Hyman. "Differences in measures of boldness even when underlying behavioral syndromes are present in two populations of the song sparrow (Melospiza melodia)." Journal of Ethology 34, no. 3 (2016): 197–206. http://dx.doi.org/10.1007/s10164-016-0465-9.

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Sandoval, Luis, Roselvy Juárez, and Mauricio Villarreal. "Different Messages are Transmitted by Individual Duet Contributions and Complete Duets in a Species with Highly Overlapped Duets." Open Ornithology Journal 11, no. 1 (2018): 56–67. http://dx.doi.org/10.2174/1874453201811010056.

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Background: Duet function hypotheses have been mostly studied in bird species that produce duets with male and female solo songs. However, in order to understand if patterns of duet function are similar across all duetting species, it is highly necessary to test the duet function hypotheses in species that produce duets with vocalizations other than solo songs. Objective: We studied the responses of territorial pairs to each sex’s individual duet contribution and complete duets in a species that produces duets with a vocalization other than male and female solo songs. Methods: We conducted a p

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Wilson, Scott, D. Ryan Norris, Amy G. Wilson, and Peter Arcese. "Breeding experience and population density affect the ability of a songbird to respond to future climate variation." Proceedings of the Royal Society B: Biological Sciences 274, no. 1625 (2007): 2539–45. http://dx.doi.org/10.1098/rspb.2007.0643.

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Predicting how populations respond to climate change requires an understanding of whether individuals or cohorts within populations vary in their response to climate variation. We used mixed-effects models on a song sparrow ( Melospiza melodia ) population in British Columbia, Canada, to examine differences among females and cohorts in their average breeding date and breeding date plasticity in response to the El Niño Southern Oscillation. Climatic variables, age and population density were strong predictors of timing of breeding, but we also found considerable variation among individual femal

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WINGFIELD, J. "Plasma levels of prolactin and gonadal steroids in relation to multiple-brooding and renesting in free-living populations of the song sparrow, Melospiza melodia." Hormones and Behavior 24, no. 1 (1990): 89–103. http://dx.doi.org/10.1016/0018-506x(90)90029-w.

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Haney, J. Christopher, David S. Lee, and Mark Wilbert. "A Half-Century Comparison of Breeding Birds in the Southern Appalachians." Condor 103, no. 2 (2001): 268–77. http://dx.doi.org/10.1093/condor/103.2.268.

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Abstract We evaluated long-term (∼50-year) change in a bird community of an extensively forested region of the southern Appalachian mountains in North Carolina and Tennessee. A species accumulation curve for a 1996–1998 survey identified a core of 50 breeding species in upper elevations of the Unicoi Mountains. Since a 1944–1946 survey, dominant species have remained identical, no species have disappeared, and mean ranked abundance of both short and long-distance migrants has not changed. Permanent residents, however, had decreased in rank by the late 1990s. Three “new” disturbance-dependent s

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Zanette, Liana, Daniel T. Haydon, James N. M. Smith, Mary J. Taitt, and Michael Clinchy. "Reassessing the Cowbird Threat." Auk 124, no. 1 (2007): 210–23. http://dx.doi.org/10.1093/auk/124.1.210.

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Abstract The demographic significance of parasitism by Brown-headed Cowbirds (Molothrus ater; hereafter “cowbirds”) has been debated for years, because manipulative studies are few and mathematical models of cowbird-host systems have not led to tests of their predictions. We combine results from a cowbird- removal experiment (Smith et al. 2002, 2003) with a stochastic simulation model that we developed, to reassess the effect of cowbirds on the annual reproductive success (ARS) and nesting success in Song Sparrows (Melospiza melodia). Our model followed the breeding success of individual Song

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Williams, Heather. "Mechanisms of Cultural Evolution in the Songs of Wild Bird Populations." Frontiers in Psychology 12 (April 26, 2021). http://dx.doi.org/10.3389/fpsyg.2021.643343.

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Young songbirds draw the source material for their learned songs from parents, peers, and unrelated adults, as well as from innovation. These learned songs are used for intraspecific communication, and have well-documented roles for such functions as territory maintenance and mate attraction. The songs of wild populations differ, forming local “dialects” that may shift over time, suggesting that cultural evolution is at work. Recent work has focused on the mechanisms responsible for the cultural evolution of bird songs within a population, including drift, learning biases (such as conformity a

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To, Ann W. Y., Caroline Dingle, and Sarah A. Collins. "Multiple constraints on urban bird communication: both abiotic and biotic noise shape songs in cities." Behavioral Ecology, July 13, 2021. http://dx.doi.org/10.1093/beheco/arab058.

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Abstract Ambient noise can cause birds to adjust their songs to avoid masking. Most studies investigate responses to a single noise source (e.g., low-frequency traffic noise, or high-frequency insect noise). Here, we investigated the effects of both anthropogenic and insect noise on vocalizations of four common bird species in Hong Kong. Common Tailorbirds (Orthotomus sutorius) and Eurasian Tree Sparrows (Passer montanus) both sang at a higher frequency in urban areas compared to peri-urban areas. Red-whiskered Bulbuls (Pycnonotus jocosus) in urban areas shifted the only first note of their so

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