Effects of Broadcasting Conspecific and Heterospecific Calls on Detection of Marsh Birds in North America

Conway, Courtney J.; Nadeau, Christopher P.

doi:10.1007/s13157-010-0030-1

Cited by 29 publications

(32 citation statements)

References 10 publications

(23 reference statements)

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“…In contrast to the species above, studies reported conflicting results regarding the effectiveness of call-broadcast at increasing vocalization probability of the bitterns. Call-broadcast increased the number of American Bitterns (Botaurus lentiginosus) detected by 240% in South Dakota (Allen et al 2004), and by 295% and 52%-59% in New York (Conway and Gibbs 2001;Lor and Malecki 2002), but did not increase numbers detected in other studies (Cashen 1998;Conway and Gibbs 2005;Conway and Nadeau 2010). Similarly, call-broadcast increased vocalization probability of Least Bitterns (Lxyobrychus exilis) by 140% and 80% in New York (Swift et al 1988;Bogner and Baldassarre 2002) and by 750% in Maine (Gibbs and Melvin 1993), but had little effect in other studies (Cashen 1998;Lor and Malecki 2002;Conway and Gibbs 2005;Tozer et al 2007;Soehren et al 2009;Conway and Nadeau 2010).…”

Section: Resultsmentioning

confidence: 71%

“…Many past studies identified factors that influence detection probability of marsh birds; these issues are summarized in the following sections. (Erwin et al 2002;Lor and Malecki 2002;Allen et al 2004;Conway et al 2004;Conway and Gibbs 2005;Pierluissi 2006;DesRochers et al 2008;Soehren et al 2009;Conway and Nadeau 2010). In contrast to the species above, studies reported conflicting results regarding the effectiveness of call-broadcast at increasing vocalization probability of the bitterns.…”

Section: Resultsmentioning

confidence: 99%

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Summary of Intrinsic and Extrinsic Factors Affecting Detection Probability of Marsh Birds

Conway

Gibbs

2011

Wetlands

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Many species of marsh birds (rails, bitterns, grebes, etc.) rely exclusively on emergent marsh vegetation for all phases of their life cycle, and many organizations have become concerned about the status and persistence of this group of birds. Yet, marsh birds are notoriously difficult to monitor due to their secretive habits. We synthesized the published and unpublished literature and summarized the factors that influence detection probability of secretive marsh birds in North America. Marsh birds are more likely to respond to conspecific than heterospecific calls, and seasonal peak in vocalization probability varies among co-existing species. The effectiveness of morning versus evening surveys varies among species and locations. Vocalization probability appears to be positively correlated with density in breeding Virginia Rails (Rallus limicola), Soras (Porzana carolina), and Clapper Rails (Rallus longirostris). Movement of birds toward the broadcast source creates biases when using count data from callbroadcast surveys to estimate population density. Ambient temperature, wind speed, cloud cover, and moon phase affected detection probability in some, but not all, studies. Better estimates of detection probability are needed. We provide recommendations that would help improve future marsh bird survey efforts and a list of 14 priority information and research needs that represent gaps in our current knowledge where future resources are best directed.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Summary of Intrinsic and Extrinsic Factors Affecting Detection Probability of Marsh Birds

Conway

Gibbs

2011

Wetlands

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“…Similarly, we included year in the abundance process to account for known or suspected changes in abundance across years (e.g., Tozer 2013) and survey interval in the detectability process to account for known differences in detectability between intervals before, during, and after conspecific call broadcasts (Conway and Nadeau 2010). As the main focus of the study, we included wind, temperature, cloud, date, daylight, and time of day in the availability and detectability processes to describe daily, seasonal, and weather-related variation in availability and detectability.…”

Section: Analysesmentioning

confidence: 99%

Modeling detection probability to improve marsh bird surveys in southern Canada and the Great Lakes states

Tozer¹,

Drake²,

Falconer³

2016

ACE

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ABSTRACT. Marsh birds are notoriously elusive, with variation in detection probability across species, regions, seasons, and different times of day and weather. Therefore, it is important to develop regional field survey protocols that maximize detections, but that also produce data for estimating and analytically adjusting for remaining differences in detections. We aimed to improve regional field survey protocols by estimating detection probability of eight elusive marsh bird species throughout two regions that have ongoing marsh bird monitoring programs: the southern Canadian Prairies (Prairie region) and the southern portion of the Great Lakes basin and parts of southern Québec (Great Lakes-St. Lawrence region). We accomplished our goal using generalized binomial N-mixture models and data from ~22,300 marsh bird surveys conducted between 2008 and 2014 by Bird Studies Canada's Prairie, Great Lakes, and Québec Marsh Monitoring Programs. Across all species, on average, detection probability was highest in the Great Lakes-St. Lawrence region from the beginning of May until mid-June, and then fell throughout the remainder of the season until the end of June; was lowest in the Prairie region in mid-May and then increased throughout the remainder of the season until the end of June; was highest during darkness compared with light; and did not vary significantly according to temperature (range: 0-30°C), cloud cover (0%-100%), or wind (0-20 kph), or during morning versus evening. We used our results to formulate improved marsh bird survey protocols for each region. Our analysis and recommendations are useful and contribute to conservation of wetland birds at various scales from local single-species studies to the continental North American Marsh Bird Monitoring Program. Modélisation de la probabilité de détection visant l'amélioration des suivis d'oiseaux de marais dans le sud du Canada et les États des Grands LacsRÉSUMÉ. Les oiseaux de marais sont célèbres pour leur moeurs discrètes, entraînant du coup des probabilités de détection variables selon les espèces, les régions, les saisons, le moment de la journée et les conditions météorologiques. Il est donc important d'élaborer des protocoles régionaux de relevé sur le terrain qui maximisent les détections, mais produisent aussi des données permettant d'estimer et d'ajuster analytiquement les différences de détectabilité restantes. Notre objectif était d'améliorer les protocoles régionaux de relevé sur le terrain en estimant la probabilité de détection de huit espèces de marais discrètes dans deux régions hôtes de programmes réguliers de suivis d'oiseaux de marais : le sud des Prairies canadiennes (région des Prairies), et la partie sud du bassin des Grands Lacs et des zones du Québec méridional (région des Grands-Lacs-Saint-Laurent). Pour ce faire, nous avons utilisé des modèles N-mélange binomiaux généralisés et les données de 22 300 relevés d'oiseaux de marais réalisés entre 2008 et 2014 dans le cadre des Programmes de surveillance des marais des Prairies, des Gran...

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“…Similarly, the sight of the Least Grebe (Tachy baptus dominicus) is considered to be uncommon in the region (OrtegaÁlvarez 2013). In a similar way, the unique observation that we had of the Sora (Porzana carolina) was notable because certain species of waterfowl, like some from the Ra llidae family, are elusive, cryptic and difficult to watch; therefore the studies of their abundance can be complemented with other techniques like recorded calling playback (Brambilla andJenkins 2009, Conway andNadeau 2010). These observations suggest that this wetland offers specific characteristics to rare species, which increase its ecological value.…”

Section: Hernández-colina Et Almentioning

confidence: 67%

Comunidad de aves acuáticas de un humedal protegido en el Estado de México, México

Hernández-Colina

Yadeun

Garcı́a-Espinosa

2017

Huitzil Rev. Mex. Ornitol.

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Wetlands are one of the most important ecosystems worldwide due to the great biologic diversity that they harbor and the resources and ecosystem services that they provide; however, their conservation is seriously threatened. Waterfowl are one of the most representative components of wetland biodiversity and the study of their communities is necessary to establish protection priorities appropriately. In this study, we describe the species richness and relative abundance of the waterfowl community of an artificial wetland in Mexico State which we visited from August 2010 to August 2011. We found 23 species, most of which belong to the Anatidae (ducks) and Ardeidae (herons) families and we recorded an accumulated abundance of 25,220 indivi duals. We performed an accumulation curve and we used Clench's model which estimated 24 species; thus, we observed 95% of the predicted species. The arrival of migratory species contributed substantially to the increase of the species richness and the abundance of individuals, especially from October to March. We consider that the species richness and the abundance that we recorded, including observations of rare species, species reproducing, and species under a conservation category, are indicative of the great ecological value of this wetland despite its limited size. Therefore, it is relevant to assess ecological features of natural and artificial wetlands, including waterfowl communities, in order to improve the conservation actions in this region.Keywords: Abundance, Anatidae, Ardeidae, conservation, distribution, diversity, species richness. ResumenLos humedales son de los ecosistemas más importantes en el mundo por la gran diversidad biológica que albergan y los recursos y servicios ecosistémicos que proporcionan; sin embargo, su conservación está severamente amenazada. Las aves acuáticas son uno de los componentes más representativos de la biodiversidad de los humedales y es necesario estudiar sus comunidades para establecer prioridades de protección adecuadamente. En este estudio describimos la riqueza de especies y abundancia relativa de la comunidad de aves acuáticas de un humedal del Estado de México que visitamos desde agosto de 2010 al mes de agosto de 2011. Encontramos 23 especies de aves acuáticas, la mayoría pertenecen a las familias Anatidae (patos) y Ardeidae (garzas) y registramos una abundancia acumulada de 25,220 individuos. Realizamos una curva de acumulación de especies y empleamos el modelo de Clench, cuya estimación fue de 24 especies; por lo tanto, observamos al 95% de las especies predichas. La llegada de especies migratorias contribuyó evidentemente al incremento de la riqueza de especies y la abundancia de individuos, especialmente de octubre a marzo. Consideramos que la riqueza de especies y la abundancia que registramos, así como la observación de especies poco comunes, especies reproduciéndose y especies sujetas a una categoría de conservación, indican el gran valor ecológico de este humedal a pesar de su extensión limitada. Por lo tanto,...

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Effects of Broadcasting Conspecific and Heterospecific Calls on Detection of Marsh Birds in North America

Cited by 29 publications

References 10 publications

Summary of Intrinsic and Extrinsic Factors Affecting Detection Probability of Marsh Birds

Summary of Intrinsic and Extrinsic Factors Affecting Detection Probability of Marsh Birds

Modeling detection probability to improve marsh bird surveys in southern Canada and the Great Lakes states

Comunidad de aves acuáticas de un humedal protegido en el Estado de México, México

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