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https://www.readbyqxmd.com/read/28088724/the-effect-of-urban-growth-on-landscape-scale-restoration-for-a-fire-dependent%C3%A2-songbird
#1
Bradley A Pickens, Jeffrey F Marcus, John P Carpenter, Scott Anderson, Paul J Taillie, Jaime A Collazo
A landscape-scale perspective on restoration ecology has been advocated, but few studies have informed restoration with landscape metrics or addressed broad-scale threats. Threats such as urban growth may affect restoration effectiveness in a landscape context. Here, we studied longleaf pine savanna in the rapidly urbanizing southeastern United States where a habitat-specialist bird, Bachman's sparrow (Peucaea aestivalis), is closely associated with savanna vegetation structure and frequent fire. Our objectives were to construct a species distribution model for Bachman's sparrow, determine the relationship between fire and urbanization, quantify the urban growth effect (2010-2090), identify potential restoration areas, and determine the interaction between restoration potential and urban growth by 2050...
January 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28087242/brains-for-birds-and-babies-neural-parallels-between-birdsong-and-speech-acquisition
#2
REVIEW
Jonathan Prather, Kazuo Okanoya, Johan J Bolhuis
Language as a computational cognitive mechanism appears to be unique to the human species. However, there are remarkable behavioral similarities between song learning in songbirds and speech acquisition in human infants that are absent in non-human primates. Here we review important neural parallels between birdsong and speech. In both cases there are separate but continually interacting neural networks that underlie vocal production, sensorimotor learning, and auditory perception and memory. As in the case of human speech, neural activity related to birdsong learning is lateralized, and mirror neurons linking perception and performance may contribute to sensorimotor learning...
January 10, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28078389/responses-of-a-federally-endangered-songbird-to-understory-thinning-in-oak-juniper-woodlands
#3
Ashley M Long, Mike E Marshall, Michael L Morrison, K Brian Hays, Shannon L Farrell
Wildlife conservation and management on military lands must be accomplished in the context of military readiness, which often includes ground-based training that is perceived to conflict with wildlife needs and environmental regulations. From 2008‒2012, we examined territory density, pairing success, and fledging success of the federally endangered golden-cheeked warbler (Setophaga chrysoparia; hereafter warbler) in relation to removal of small-diameter trees from the understory of mature oak-juniper (Quercus-Juniperus) woodland at the 87,890 ha Fort Hood Military Reservation in central Texas...
January 11, 2017: Environmental Management
https://www.readbyqxmd.com/read/28077768/corticosterone-and-timing-of-migratory-departure-in-a-songbird
#4
Cas Eikenaar, Florian Müller, Clara Leutgeb, Sven Hessler, Konstantin Lebus, Philip D Taylor, Heiko Schmaljohann
Bird migration entails replenishing fuel stores at stopover sites. There, individuals make daily decisions whether to resume migration, and must also decide their time of departure. Variation in departure timing affects the total time required to complete a migratory journey, which in turn affects fitness through arrival time at the breeding and wintering grounds. It is well established that stopover departure decisions are based on cues from innate rhythms, intrinsic factors and extrinsic factors. Yet, virtually nothing is known about the physiological mechanism(s) linking these cues to departure decisions...
January 11, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28077685/working-with-what-you-ve-got-unattractive-males-show-greater-mate-guarding-effort-in-a-duetting-songbird
#5
Jenélle Dowling, Michael S Webster
When mates are limited, individuals should allocate resources to mating tactics that maximize fitness. In species with extra-pair paternity (EPP), males can invest in mate guarding, or, alternatively, in seeking EPP. Males should optimize fitness by adjusting investment according to their attractiveness to females, such that attractive males seek EPP, and unattractive males guard mates. This theory has received little empirical testing, leaving our understanding of the evolution of mating tactics incomplete; it is unclear how a male's relative attractiveness influences his tactics...
January 2017: Biology Letters
https://www.readbyqxmd.com/read/28077286/assessment-of-neuroanatomical-and-behavioural-effects-of-in-ovo-methylmercury-exposure-in-zebra-finches-taeniopygia-guttata
#6
Maria S Yu, Margaret L Eng, Tony D Williams, Mélanie F Guigueno, John E Elliott
Methylmercury (MeHg) readily crosses the blood brain barrier and is a known neuro-toxicant. MeHg accumulation in the brain causes histopathological alterations, neurobehavioral changes, and impairments to cognitive motor functions in mammalian models. However, in birds the neurotoxic effects of MeHg on the developing pre-hatching brain and consequent behavioral alterations in adult birds have not received much attention. Moreover, passerine birds are poorly represented in MeHg neurotoxicology studies in comparison to other avian orders...
January 7, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28070300/a-before-after-control-impact-assessment-to-understand-the-potential-impacts-of-highway-construction-noise-and-activity-on-an-endangered-songbird
#7
Ashley M Long, Melanie R Colón, Jessica L Bosman, Dianne H Robinson, Hannah L Pruett, Tiffany M McFarland, Heather A Mathewson, Joseph M Szewczak, J Cal Newnam, Michael L Morrison
Anthropogenic noise associated with highway construction and operation can have individual- and population-level consequences for wildlife (e.g., reduced densities, decreased reproductive success, behavioral changes). We used a before-after control-impact study design to examine the potential impacts of highway construction and traffic noise on endangered golden-cheeked warblers (Setophaga chrysoparia; hereafter warbler) in urban Texas. We mapped and monitored warbler territories before (2009-2011), during (2012-2013), and after (2014) highway construction at three study sites: a treatment site exposed to highway construction and traffic noise, a control site exposed only to traffic noise, and a second control site exposed to neither highway construction or traffic noise...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28060907/sex-differences-in-brain-thyroid-hormone-levels-during-early-post-hatching-development-in-zebra-finch-taeniopygia-guttata
#8
Shinji Yamaguchi, Shin Hayase, Naoya Aoki, Akihiko Takehara, Jun Ishigohoka, Toshiya Matsushima, Kazuhiro Wada, Koichi J Homma
Thyroid hormones are closely linked to the hatching process in precocial birds. Previously, we showed that thyroid hormones in brain had a strong impact on filial imprinting, an early learning behavior in newly hatched chicks; brain 3,5,3'-triiodothyronine (T3) peaks around hatching and imprinting training induces additional T3 release, thus, extending the sensitive period for imprinting and enabling subsequent other learning. On the other hand, blood thyroid hormone levels have been reported to increase gradually after hatching in altricial species, but it remains unknown how the brain thyroid hormone levels change during post-hatching development of altricial birds...
2017: PloS One
https://www.readbyqxmd.com/read/28057835/how-social-learning-adds-up-to-a-culture-from-birdsong-to-human-public-opinion
#9
REVIEW
Ofer Tchernichovski, Olga Feher, Daniel Fimiarz, Dalton Conley
Distributed social learning may occur at many temporal and spatial scales, but it rarely adds up to a stable culture. Cultures vary in stability and diversity (polymorphism), ranging from chaotic or drifting cultures, through cumulative polymorphic cultures, to stable monolithic cultures with high conformity levels. What features can sustain polymorphism, preventing cultures from collapsing into either chaotic or highly conforming states? We investigate this question by integrating studies across two quite separate disciplines: the emergence of song cultures in birds, and the spread of public opinion and social conventions in humans...
January 1, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28054584/inefficient-co-feeding-transmission-of-borrelia-afzelii-in-two-common-european-songbirds
#10
Dieter J A Heylen, Hein Sprong, Aleksandra Krawczyk, Natalie Van Houtte, Dolores Genné, Andrea Gomez-Chamorro, Kees van Oers, Maarten J Voordouw
The spirochete bacterium Borrelia afzelii is the most common cause of Lyme borreliosis in Europe. This tick-borne pathogen can establish systemic infections in rodents but not in birds. However, several field studies have recovered larval Ixodes ricinus ticks infected with B. afzelii from songbirds suggesting successful transmission of B. afzelii. We reviewed the literature to determine which songbird species were the most frequent carriers of B. afzelii-infected I. ricinus larvae and nymphs. We tested experimentally whether B...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28051939/ecologically-relevant-cooling-early-in-life-alters-prefledging-adrenocortical-response-in-free-living-songbirds
#11
Sharon E Lynn, Michael D Kern
In vertebrates, exposure to stressful stimuli early in development may alter the activity of the hypothalamo-pituitary-adrenal (HPA) axis, with the potential for fitness consequences later in life. For altricial species, whose young rely on their parents for food, warmth, and protection from predators, adult behavior can modify the impact of some stressors on their offspring after birth or hatching. We have shown that single bouts of cooling that normally occur when brooding females leave the nest elevate corticosterone secretion in very young free-living eastern bluebird (Sialia sialis) chicks...
January 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28045891/susceptibility-and-antibody-response-of-the-laboratory-model-zebra-finch-taeniopygia-guttata-to-west-nile-virus
#12
Erik K Hofmeister, Melissa Lund, Valerie Shearn-Bochsler, Christopher N Balakrishnan
Since the introduction of West Nile virus (WNV) into North America in 1999 a number of passerine bird species have been found to play a role in the amplification of the virus. Arbovirus surveillance, observational studies and experimental studies have implicated passerine birds (songbirds, e.g., crows, American robins, house sparrows, and house finches) as significant reservoirs of WNV in North America, yet we lack a tractable passerine animal model for controlled studies of the virus. The zebra finch (Taeniopygia guttata) serves as a model system across a diversity of fields, and here we develop the zebra finch a songbird model for WNV...
2017: PloS One
https://www.readbyqxmd.com/read/28031398/principles-of-auditory-processing-differ-between-sensory-and-premotor-structures-of-the-songbird-forebrain
#13
Efe Soyman, David S Vicario
Sensory and motor brain structures work in collaboration during perception. To evaluate their respective contributions, the present study recorded neural responses to auditory stimulation at multiple sites simultaneously in both the higher-order auditory area NCM and premotor area HVC of the songbird brain in awake zebra finches (Taeniopygia guttata). Bird's own song (BOS) and various conspecific songs (CON) were presented in both blocked and shuffled sequences. Neural responses showed plasticity in the form of stimulus specific adaptation with markedly different dynamics between the two structures...
December 28, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28030559/breeding-dispersal-by-birds-in-a-dynamic-urban-ecosystem
#14
John M Marzluff, Jack H DeLap, M David Oleyar, Kara A Whittaker, Beth Gardner
Changes in land cover during urbanization profoundly affect the diversity of bird communities, but the demographic mechanisms affecting diversity are poorly known. We advance such understanding by documenting how urbanization influences breeding dispersal-the annual movement of territorial adults-of six songbird species in the Seattle, WA, USA metropolitan area. We color-banded adults and mapped the centers of their annual breeding activities from 2000-2010 to obtain 504 consecutive movements by 337 adults...
2016: PloS One
https://www.readbyqxmd.com/read/28004803/convergent-evidence-for-the-molecular-basis-of-musical-traits
#15
Jaana Oikkonen, Päivi Onkamo, Irma Järvelä, Chakravarthi Kanduri
To obtain aggregate evidence for the molecular basis of musical abilities and the effects of music, we integrated gene-level data from 105 published studies across multiple species including humans, songbirds and several other animals and used a convergent evidence method to prioritize the top candidate genes. Several of the identified top candidate genes like EGR1, FOS, ARC, BDNF and DUSP1 are known to be activity-dependent immediate early genes that respond to sensory and motor stimuli in the brain. Several other top candidate genes like MAPK10, SNCA, ARHGAP24, TET2, UBE2D3, FAM13A and NUDT9 are located on chromosome 4q21-q24, on the candidate genomic region for music abilities in humans...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27998740/identification-and-functional-characterization-of-the-house-finch-interleukin-1%C3%AE
#16
Myeongseon Park, Sungwon Kim, James S Adelman, Ariel E Leon, Dana M Hawley, Rami A Dalloul
Interleukin-1β (IL-1β), an inflammatory cytokine of the IL-1 family, is primarily produced as a precursor protein by monocytes and macrophages, then matures and becomes activated through proteolytic catalysis. Although the biological characteristics of avian IL-1β are well known, little information is available about its biological role in songbird species such as house finches that are vulnerable to naturally-occurring inflammatory diseases. In this study, house finch IL-1β (HfIL-1β) was cloned, expressed, and its biological function examined...
December 18, 2016: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/27994122/cranial-shape-evolution-in-adaptive-radiations-of-birds-comparative-morphometrics-of-darwin-s-finches-and-hawaiian-honeycreepers
#17
Masayoshi Tokita, Wataru Yano, Helen F James, Arhat Abzhanov
Adaptive radiation is the rapid evolution of morphologically and ecologically diverse species from a single ancestor. The two classic examples of adaptive radiation are Darwin's finches and the Hawaiian honeycreepers, which evolved remarkable levels of adaptive cranial morphological variation. To gain new insights into the nature of their diversification, we performed comparative three-dimensional geometric morphometric analyses based on X-ray microcomputed tomography (µCT) scanning of dried cranial skeletons...
February 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/27966648/anesthesia-and-brain-sensory-processing-impact-on-neuronal-responses-in-a-female-songbird
#18
G Karino, I George, L Loison, C Heyraud, G De Groof, M Hausberger, H Cousillas
Whether anesthesia impacts brain sensory processing is a highly debated and important issue. There is a general agreement that anesthesia tends to diminish neuronal activity, but its potential impact on neuronal "tuning" is still an open question. Here we show, based on electrophysiological recordings in the primary auditory area of a female songbird, that anesthesia induces neuronal responses towards biologically irrelevant sounds and prevents the seasonal neuronal tuning towards functionally relevant species-specific song elements...
December 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27956484/photoperiod-but-not-food-restriction-modulates-innate-immunity-in-an-opportunistic-breeder-loxia-curvirostra
#19
Elizabeth M Schultz, Thomas P Hahn, Kirk C Klasing
An organism's investment in immune function often varies seasonally but understanding of how fluctuations in environmental conditions directly modulate investment remains limited. This experiment investigated how changes in photoperiod and food availability affect investment in constitutive innate immunity and the acute phase response induced by lipopolysaccharide (LPS) injections in captive red crossbills (Loxia curvirostra). Crossbills are reproductively flexible songbirds that specialize on an unpredictably available food resource and display temporal variation in immunity in the wild...
December 12, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27942864/seasonal-survival-estimation-for-a-long-distance-migratory-bird-and-the-influence-of-winter-precipitation
#20
Sarah M Rockwell, Joseph M Wunderle, T Scott Sillett, Carol I Bocetti, David N Ewert, Dave Currie, Jennifer D White, Peter P Marra
Conservation of migratory animals requires information about seasonal survival rates. Identifying factors that limit populations, and the portions of the annual cycle in which they occur, are critical for recognizing and reducing potential threats. However, such data are lacking for virtually all migratory taxa. We investigated patterns and environmental correlates of annual, oversummer, overwinter, and migratory survival for adult male Kirtland's warblers (Setophaga kirtlandii), an endangered, long-distance migratory songbird...
December 9, 2016: Oecologia
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