Yellow Warbler Research Articles

Small Endemic Birds and Hot Climate: Avian and Environmental Predictors of Avifauna Road Mortality in Santa Cruz Galapagos

In the Galapagos Islands, the main road in Santa Cruz is one of the elements involved in bird road mortality along with vehicles and the impacted species. This study reports the number of roadkilled birds found on the road from the Itabaca Channel to Puerto Ayora, and the main factors, whether avian or environmental, involved in bird roadkill mortality. We collected individual carcasses in 2004, 2005, 2006, and 2018 with a prevalence of 278, 252, 265, and 294, respectively, across 21 species. The endemic Yellow Warbler Setophaga petechia aureola was the most affected bird. We used a PRIDIT model to rank the top avian and environmental predictors of road mortality. We found that for the sampled years, bird body size (i.e., 8–35 g) and the endemism status (i.e., endemic/native) were the main predictors of roadkill mortality, along with seasonality (i.e., hot season). Weaker predictors related to the bird (i.e., age and sex) and the environment (ecosystem, road slope, vegetation, or precipitation) are also reported as determinants of roadkill mortality. This study on avian mortality aims to inform conservation strategies to reduce the rate of wildlife avian roadkill on Santa Cruz Island and other islands with similar problems.

Slow and steady: auditory features for discriminating animal vocalizations.

We propose that listeners can use temporal regularities - spectro-temporal correlations that change smoothly over time - to discriminate animal vocalizations within and between species. To test this idea, we used Slow Feature Analysis (SFA) to find the most temporally regular components of vocalizations from birds (blue jay, house finch, American yellow warbler, and great blue heron), humans (English speakers), and rhesus macaques. We projected vocalizations into the learned feature space and tested intra-class (same speaker/species) and inter-class (different speakers/species) auditory discrimination by a trained classifier. We found that: 1) Vocalization discrimination was excellent (> 95%) in all cases; 2) Performance depended primarily on the ~10 most temporally regular features; 3) Most vocalizations are dominated by ~10 features with high temporal regularity; and 4) These regular features are highly correlated with the most predictable components of animal sounds.

Invasive shrub species as nest substrates do not appear to impact nest failure for Yellow Warblers (Setophaga petechia)

Invasive shrub species as nest substrates do not appear to impact nest failure for Yellow Warblers (Setophaga petechia)

Bird‐habitat associations and local‐scale vegetation structure in lowland brushlands

AbstractBrushlands support a diverse suite of bird species, including species of conservation concern in the western Great Lakes region of central North America. Information on how to effectively manage lowland brushlands for birds and associations between breeding birds and local‐scale vegetation structure and composition is lacking. We surveyed lowland brushlands from 2016–2018 in Minnesota, USA, to assess bird‐habitat associations using avian point‐count surveys and fixed‐radius vegetation plots. We used Poisson regression models to assess the associations between breeding bird species richness, total abundance, and abundance of frequently detected species (using counts as an index for abundance) to woody stem density and height, patchiness of woody stem density, variation of woody stem height, and number of woody plant species. Sedge wrens (Cistothorus stellaris), the most abundant species, were negatively associated with multiple woody plant metrics and positively associated with patchiness. Common yellowthroats (Geothlypis trichas) were the second‐most abundant species and associated with low‐stature woody plants (<1 m based on average heights in study sites). Bird species richness, alder flycatchers (Empidonax alnorum), chestnut‐sided warblers (Setophaga pensylvanica), swamp sparrows (Melospiza georgiana), veeries (Catharus fuscescens), and yellow warblers (Setophaga petechia) increased with woody vegetation height. Chestnut‐sided warbler and Nashville warbler (Leiothlypis ruficapilla) abundances also increased with woody stem density. We suggest that managing lowland brushlands to promote diverse woody plant structure, including tall shrubs and areas with patchy, open herbaceous cover, by implementing temporally and spatially variable disturbance regimes, may benefit bird species that rely on lowland brushlands with a range of vegetation structure requirements.

A highly contiguous genome assembly for the Yellow Warbler (Setophaga petechia).

The Yellow Warbler (Setophaga petechia) is a small songbird in the wood-warbler family (Parulidae) that exhibits phenotypic and ecological differences across a widespread distribution and is important to California's riparian habitat conservation. Here, we present a high-quality de novo genome assembly of a vouchered female Yellow Warbler from southern California. Using HiFi long-read and Omni-C proximity sequencing technologies, we generated a 1.22 Gb assembly including 687 scaffolds with a contig N50 of 6.80 Mb, scaffold N50 of 21.18 Mb, and a BUSCO completeness score of 96.0%. This highly contiguous genome assembly provides an essential resource for understanding the history of gene flow, divergence, and local adaptation in Yellow Warblers and can inform conservation management of this charismatic bird species.

Bird color and taxonomic diversity are negatively related to human disturbance in urban parks

Abstract. Recently, studies have shown that highly urbanized areas are numerically dominated by birds with grey plumage, probably favoring camouflage with impervious grey surfaces. However, patterns of bird color diversity in urban green areas remain unexplored. In urban parks, sites surrounded by highly urbanized areas may be dominated by grey bird species, whereas urban parks with pedestrians that feed birds may favor commensal birds which also have grey plumage. Thus, we explore the relationship between environmental variables and bird taxonomic and color diversity in urban parks. Bird surveys were conducted twice by fixed points in urban parks of six cities in central Argentina. Bird color diversity was assessed by characterizing bird plumage coloration in different parts of the bird body and the presence of plumage sexual dimorphism, polymorphism, and iridescence. Then, color richness and color diversity (abundance-based) were calculated with species mean pairwise distance. Null models were used to quantify richness-corrected color diversity. Bird species richness and diversity increased with green-area size, and bird diversity decreased with increasing pedestrian traffic. Color richness decreased with increasing car traffic, whereas color diversity was positively related to green-area size and negatively related to car and pedestrian traffic. Richness-corrected color diversity related negatively to car and pedestrian traffic. The abundance of grey birds increased in parks near the urban centers and related positively to pedestrian and car traffic. The abundance of yellow birds increased in parks near rural areas or small cities. Color diversity increased with green-area size, but richness-corrected color diversity ceased to be related to area size. Therefore, the increase in color diversity with area size was mediated by increases in species richness. Color diversity was clustered in parks with the highest human disturbance, favoring the abundance of grey species which probably took advantage of food discarded by humans.

Functional neurogenomic responses to acoustic threats, including a heterospecific referential alarm call and its referent, in the auditory forebrain of red-winged blackbirds

In animal communication, functionally referential alarm calls elicit the same behavioral responses as their referents, despite their typically distinct bioacoustic traits. Yet the auditory forebrain in at least one songbird species, the black-capped chickadee Poecile atricapillus, responds similarly to threat calls and their referent predatory owl calls, as assessed by immediate early gene responses in the secondary auditory forebrain nuclei. Whether and where in the brain such perceptual and cognitive equivalence is processed remains to be understood in most other avian systems. Here, we studied the functional neurogenomic (non-) equivalence of acoustic threat stimuli perception by the red-winged blackbird Agelaius phoeniceus in response to the actual calls of the obligate brood parasitic brown-headed cowbird Molothrus ater and the referential anti-parasitic alarm calls of the yellow warbler Setophaga petechia, upon which the blackbird is known to eavesdrop. Using RNA-sequencing from neural tissue in the auditory lobule (primary and secondary auditory nuclei combined), in contrast to previous findings, we found significant differences in the gene expression profiles of both an immediate early gene, ZENK (egr-1), and other song-system relevant gene-products in blackbirds responding to cowbird vs. warbler calls. In turn, direct cues of threats (including conspecific intruder calls and nest-predator calls) elicited higher ZENK and other differential gene expression patterns compared to harmless heterospecific calls. These patterns are consistent with a perceptual non-equivalence in the auditory forebrain of adult male red-winged blackbirds in response to referential calls and the calls of their referents.

Come and See the Yellow Bird, Dear!

Come and See the Yellow Bird, Dear!

An Ecocritical Perspective of Flora and Fauna under the 2003 Invasion of Iraq in American and Iraqi novels

Abstract This essay offers ecocritical discussions of Iraqi flora and fauna under the 2003 invasion of Iraq from the point of view of both American and Iraqi novelists. The purpose of this paper is to examine how the American Kevin Powers’s in The Yellow Birds (2012) and Iraqi Sinan Antoon's in The Book of Collateral Damage (2019) extend their moral mission of the 2003 invasion of Iraq which moves beyond the human species to include flora and fauna in light of ecocriticism. More specifically, the paper attempts to expose the outrageous things reflected by Antoon and Powers that the US invasion has done to flora and fauna which are officially ignored. It also examines the proper employment of different forms of symbolism and techniques to strengthen their ecological conservation values. The study concludes that despite the selected writers’ different experiences of colonialism, they similarly stand in creating eco-consciousness that comes from their understanding that the costs of war are not only measured by the loss of humans, but also by the devastation of flora and fauna to institutionalize a strong oppositional stance towards the war in Iraq. Key words : Ecocriticism , Biocentric Vsion , Eco-justice Perspective , Environmental Ethics , Human and Nonhuman Relationship , Los of Biodiversity , Sustainability .

Absence of Referential Alarm Calls in Long-term Allopatry from the Referent: A Case Study with Galapagos Yellow Warblers

Absence of Referential Alarm Calls in Long-term Allopatry from the Referent: A Case Study with Galapagos Yellow Warblers

Mastering English Multiple Adjectives Ordering among Early versus Late Second Language Speakers: Evidence from Arabic-English Bilinguals

Recent research has shown that learners demonstrate huge variability in second language (L2) end-state attainment. While some L2 learners attain native-like command, others only attain an undeveloped command and some stuck in between. It is also assumed that early learners often surpass owing to Lenneberg’s Critical Period Hypothesis (1967) that proposes that early onset often advance L2 development. This study investigates the extent to which, age is associated with mastering the target language among late versus early Arabic-English bilinguals. Specifically, this study concerns itself with the issue of how Arabic-English bilinguals typically perceive the right ordering of multiple consecutive adjectives (e.g., the small yellow bird). A considerable amount of literature has established that L2 learners encounter challenges in mastering the right sequence of adjectives, particularly when there are several adjectives modifying a single noun. To determine how Arabic-learners of English perceive English descriptive adjective orderings, this study observes whether an earlier age of first contact with English enhances the learners’ accuracy and the reaction time. To test this assumption, the intuitions of two groups of early (n=8) vs. late (n=8) Arabic-English bilinguals in the United Kingdom (i.e. Leeds) were compared for English descriptive adjective ordering preferences through a Speeded Acceptability Judgment Task (SAJT). The participants were requested to show their ordering preferences for a couple of multi-adjective strings (n=16). The findings suggested that early Arabic-English bilinguals significantly outperformed late Arabic-English bilinguals in terms of exhibiting native-like ordering preferences. The study concludes that early exposure is more likely to facilitate mastering the target system and that it generally accelerates L2 development. This study also concludes that accuracy and response time may reflect the L2 development. The study suggests a number of pedogeological implications for teaching and learning an L2.

Multi-character approach reveals a new mangrove population of the Yellow Warbler complex, Setophaga petechia, on Cozumel Island, Mexico.

The Setophaga petechia complex includes 43 subspecies distributed within the new world, of which some are migratory and others are resident, with only two resident subspecies in the Mexican Caribbean: Setophaga petechia bryanti a mangrove subspecies belonging to the erithachorides group resident on the mainland of the Yucatan Peninsula and Setophaga petechia rufivertex endemic to Cozumel Island and belonging to the petechia group. Recently, a new population of individuals presenting intermediate phenotypic traits and living in mangrove ecosystems was discovered and reported for Cozumel Island. In this study, we used a multi-character approach including genetic (five ISSR genetic markers), morphometric (eight traits), phenotypic (four characteristics of males), and acoustic dataset (11 parameters) to understand the process of differentiation and the status of these new island individuals in relation to the two well-established subspecies using a total of 60 individuals (20 for each group). Through multivariate analyses based on different dataset used in our study, we show how the new population is related to the endemic island subspecies, S. p. rufivertex and to the mainland subspecies, S. p. bryanti while demonstrating finite differences. We conclude that the new population of S. petechia on Cozumel Island is a well-established population with high level of differentiation.

Vegetation Analysis of Target Species for Feeding Lesser Yellow Bird of Paradise (Paradisaea minor jobiensis Rothschild, 1897) in the Imbowiari Forest Area of Barawai Village, Yapen Islands District, Papua Province, Indonesia

The research aims to determine the plant species, structure, and composition of the food sources of P. minor jobiensis in the Imbowiari Barawai forest area, Yapen Islands Regency. The method used in this research the method of observation, interviews, documentation, literature, and the checkered line method. Data analysis techniques used are density, dominance, frequency, relative density, relative dominance, relative frequency, important value index, and diversity index. The results of the study found 6 species of plants as food for P. minor jobiensis and spread at the level of seedlings, poles, saplings, and trees namely Elaeocarpus sphaericus, Ficus benjamina, Gnetum gnemon, Syzygium sp., Myristica sp., and Palaquium ambounense

Tree Architecture and Powdery Mildew Resistance of Yellow-flowering Magnolias in Tennessee, USA

Magnolias (Magnolia sp.) are economically important woody ornamental plants; however, plant damage associated with frost and powdery mildew (Microsphaera alni and Phyllactinia corylea) disease is a major production challenge. To understand the tree architecture and powdery mildew resistance, 26 yellow-flowering magnolias (Magnolia sp.) were evaluated in McMinnville, TN, USA (USDA Plant Hardiness Zone 6b). One-year-old containerized trees were planted in a field plot during Mar 2006, with 4.6-m plant-to-plant and 3.7-m row-to-row spacing. The experiment was a completely randomized block design with three single-plant replications. Plant height and canopy diameter were measured on Dec 2016 and Feb 2018, and the apical dominance ratio (i.e., indicating tree architecture) was calculated by dividing the height by the canopy diameter. Plants were evaluated for powdery mildew severity and defoliation using a scale of 0% to 100% of the total plant canopy affected or defoliated, respectively, from Aug to Oct of 2016 and 2017. The area under the disease progress curve (AUDPC) was calculated for the evaluation period of each year. The plant apical dominance ratio ranged from 1 to 3, with ‘Gold Cup’ and ‘Sun Spire’ having the highest value, and ‘Lois’, ‘Gold Star’, ‘Golden Gala’, ‘Solar Flair’, ‘Stellar Acclaim’, ‘Sun Ray’, ‘Sunburst’, and ‘Sundance’ having the lowest value (i.e., relatively round shape). Of the 26 cultivars, Sundance, Sun Spire, Sun Ray, and Gold Cup had the lowest powdery mildew severity (10% to 33% in 2016 and 40% to 60% in 2017), AUDPC, and defoliation. Cultivars Anilou, Gold Star, Golden Pond, Golden Rain, Golden Sun, Green Bee, Honey Liz, Judy Zuk, Koban Dori, Lois, Solar Flair, Stellar Acclaim, and Yellow Bird were highly susceptible to powdery mildew (>80% disease severity) and had the highest AUDPC values. Results of this research may aid breeders, nursery producers, and landscapers when selecting yellow-flowering magnolia cultivars with desirable tree architecture and resistance to powdery mildew.

First national assessment of wildlife mortality in Ecuador: An effort from citizens and academia to collect roadkill data at country scale.

Ecuador has both high richness and high endemism, which are increasingly threatened by anthropic pressures, including roads. Research evaluating the effects of roads remains scarce, making it difficult to develop mitigation plans. Here, we present the first national assessment of wildlife mortality on roads that allow us to (1) estimate roadkill rates per species, (2) identify affected species and areas, and (3) reveal knowledge gaps. We bring together data from systematic surveys and citizen science efforts to present a dataset with 5010 wildlife roadkill records from 392 species, and we also provide 333 standardized corrected roadkill rates calculated on 242 species. Systematic surveys were reported by ten studies from five Ecuadorian provinces, revealing 242 species with corrected roadkill rates ranging from 0.03 to 171.72 ind./km/year. The highest rates were for the yellow warbler Setophaga petechia in Galapagos (171.72 ind./km/year), the cane toad Rhinella marina in Manabi (110.70 ind./km/year), and the Galapagos lava lizard Microlophus albemarlensis (47.17 ind./km/year). Citizen science and other nonsystematic monitoring provided 1705 roadkill records representing all 24 provinces in Ecuador and 262 identified species. The common opossum Didelphis marsupialis, the Andean white-eared opossum Didelphis pernigra, and the yellow warbler Setophaga petechia were more commonly reported (250, 104, and 81 individuals, respectively). Across all sources, we found 15 species listed as "Threatened" and six as "Data Deficient" by the IUCN. We recommend stronger research efforts in areas where the mortality of endemic or threatened species could be critical for populations, such as in Galapagos. This first country-wide assessment of wildlife mortality on Ecuadorian roads represents contributions from academia, members of the public, and government, underlining the value of wider engagement and collaboration. We hope these findings and the compiled dataset will guide sensible driving and sustainable planning of infrastructure in Ecuador and, ultimately, contribute to reduce wildlife mortality on roads.

Red-winged blackbirds nesting nearer to yellow warbler and conspecific nests experience less brood parasitism.

In functionally referential communication systems, the signaler's message intended for a conspecific receiver may be intercepted and used by a heterospecific eavesdropper for its own benefit. For example, yellow warblers (Setophaga petechia) produce seet calls to warn conspecifics of nearby brood parasitic brown-headed cowbirds (Molothrus ater), and red-winged blackbirds (Agelaius phoeniceus) eavesdrop on and recruit to seet calls to mob the brood parasites. Prior work found that warblers nesting closer to blackbirds were less likely to be parasitized, suggesting that blackbirds may even be the target of warbler's seet calls to assist with antiparasitic defense. Here we discovered for the reverse to apply too: blackbirds nesting closer to yellow warblers also experienced lower probability of brood parasitism. Concurrently, we also found that blackbirds nesting closer to other blackbirds also experience lower parasitism rates. Although these are strictly correlational results, they nonetheless suggest that blackbirds are better able to defend their nest against cowbirds when also listening to nearby warblers' referential alarm calls.

The Making of War Victims in Kevin Powers’ The Yellow Birds

This paper aims at examining Kevin Powers’ The Yellow Birds in terms of victimhood and its function regarding soldiers’ culpability for atrocities in the context of the 2003 war on Iraq. Victimization is perpetuated in the time of war to serve pro-war narrative and justify violence against the other side of the equation. One party is made innocent and vulnerable while the other is shown to be capable of despicable acts and inconsiderate to any ethical standards. We investigate the position of American soldiers and locals in Iraq, both militant and civilian, and compare the novel’s approach towards their status as war victims. Americans and Iraqis are both victims of war in Powers’ novel, but Americans are its most visible and innocent casualty; their voices are consistently heard and their personal sufferings are untiringly detailed.

Vulnerable Lives and Culpability in American War Narrative: A Comparative Approach

This paper analyses Kevin Powers’ The Yellow Birds (2012), Phil Klay’s Redeployment (2015), and Roy Scranton’s War Porn (2016) in terms of vulnerability of Iraqis’ lives in the context of the 2003 War on Iraq. It aims at uncovering the differential methods implemented by Americans to approach the lives of locals in Iraq and culpability for war atrocities. It draws on Judith Butler’s contention that Western societies address the lives/deaths of non-Western people in a differential method; the lives of Western people are prioritized at the expense of the safety and wellness of non-Western peoples. The argument is made through comparative analysis of selected works in two constructs: ‘vulnerable lives,’ and ‘accountability and culpability in war’. This paper argues that Powers and Klay’s works are more centred on soldiers’ victimized status, whilst Scranton’s is keen on showcasing Iraqis’ vulnerable position and soldiers’ accountability for their anguishes. Keywords: Iraq War; Roy Scranton; Kevin Powers; Phil Klay; Ungrievable; War Novel.

Homines Sacri in Contemporary War Novels: A Comparative Insider–Outsider Perspective

This paper examines the status of Iraqis in Sinan Antoon’s The Corpse Washer (2013) and Kevin Powers’ The Yellow Birds (2013) within the circumstances of war in Iraq and addresses the repercussions of the American-led 2003 war on Iraq from an insider–outsider perspective, that is, Antoon’s portrayal of his native land, Iraq, vis-à-vis that of Powers, an American who served in Iraq as a machine gunner for the US Army. This paper draws on Derek Gregory’s conception of homo sacer, which is initially derived from Agamben’s 1998 work. Homines sacri (singular: homo sacer), which emerge when the law suspends itself, are placed outside the law and can be abused and/or killed advertently. The insider–outsider perspectives in the aforementioned novels converge in the way that Iraqi civilians are given the ‘bare life’ status. The fragility and vulnerability of Iraqis in the face of American intervention can be seen both in life and death as the struggles of the living in performing the necessary Muslim ritual of cleansing and burying the deceased. However, the insider’s perspective in Antoon’s novel emphasizes the muted voices of the homines sacri.

From Silence to Story, through Listening and Healing: Following the Cinematic Arc of the Returning Combat Veteran in The Yellow Birds

From Silence to Story, through Listening and Healing: Following the Cinematic Arc of the Returning Combat Veteran in The Yellow Birds