Habitat use in ducks breeding in boreal freshwater wetlands: a review

Holopainen, Sari; Arzel, Céline; Dessborn, Lisa; Elmberg, Johan; Gunnarsson, Gunnar; Nummi, Petri; Pöysä, Hannu; Sjöberg, Kjell

doi:10.1007/s10344-015-0921-9

Cited by 42 publications

(41 citation statements)

References 135 publications

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“…Here, UAS-remote sensing could contribute critical information, both in the planning process (e.g., placement of transects) and in providing an overview of the whole lake area facilitating vegetation cover estimates. Differentiation among growth forms of aquatic vegetation helps in describing the character of lakes and rivers, for example, in relation to aquatic plant succession and terrestrialization [23], and in assessing their value as habitat for a variety of species from invertebrates to migrating waterfowl (e.g., [24][25][26]), as well as undesired invaders. Ecke et al [27] demonstrated that lakes rich in nymphaeids (floating-leaved vegetation) and with wide belts of helophytes (emergent vegetation) showed a higher risk than other lakes of being invaded by muskrat (Ondatra zibethicus), an invasive species in Europe.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Manual Mapping and Automated Object-Based Image Analysis of Non-Submerged Aquatic Vegetation from Very-High-Resolution UAS Images

2016

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Aquatic vegetation has important ecological and regulatory functions and should be monitored in order to detect ecosystem changes. Field data collection is often costly and time-consuming; remote sensing with unmanned aircraft systems (UASs) provides aerial images with sub-decimetre resolution and offers a potential data source for vegetation mapping. In a manual mapping approach, UAS true-colour images with 5-cm-resolution pixels allowed for the identification of non-submerged aquatic vegetation at the species level. However, manual mapping is labour-intensive, and while automated classification methods are available, they have rarely been evaluated for aquatic vegetation, particularly at the scale of individual vegetation stands. We evaluated classification accuracy and time-efficiency for mapping non-submerged aquatic vegetation at three levels of detail at five test sites (100 m × 100 m) differing in vegetation complexity. We used object-based image analysis and tested two classification methods (threshold classification and Random Forest) using eCognition ® . The automated classification results were compared to results from manual mapping. Using threshold classification, overall accuracy at the five test sites ranged from 93% to 99% for the water-versus-vegetation level and from 62% to 90% for the growth-form level. Using Random Forest classification, overall accuracy ranged from 56% to 94% for the growth-form level and from 52% to 75% for the dominant-taxon level. Overall classification accuracy decreased with increasing vegetation complexity. In test sites with more complex vegetation, automated classification was more time-efficient than manual mapping. This study demonstrated that automated classification of non-submerged aquatic vegetation from true-colour UAS images was feasible, indicating good potential for operative mapping of aquatic vegetation. When choosing the preferred mapping method (manual versus automated) the desired level of thematic detail and the required accuracy for the mapping task needs to be considered.

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Section: Introductionmentioning

confidence: 99%

Comparison of Manual Mapping and Automated Object-Based Image Analysis of Non-Submerged Aquatic Vegetation from Very-High-Resolution UAS Images

2016

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“…A review of boreal nesting ducks by Holopainen et al (2015) reported that nest site use and success was primarily related to predator avoidance. Other studies have reported that Ringnecked Ducks tend to nest close to the water (Maxson and Riggs 1996) or over the water (Koons and Rotella 2003), but in this study, Ring-necked Ducks nested farther from open water.…”

Section: K W I Devmentioning

confidence: 99%

“…The combination of climate change and increasing development and fragmentation may interact and produce synergistic effects (Dale et al 2001). Concerns emanating from these impending changes have resulted in increased interest in understanding and conserving boreal forest waterfowl (Drever et al 2012, Holopainen et al 2015. Numerous duck species breed in the boreal forest, which is the second most important area for breeding ducks in North America (U.S.…”

Section: Introductionmentioning

confidence: 99%

“…Fish and Wildlife Service 2002, Slattery et al 2011). Yet impacts of anthropogenic influences on waterfowl breeding in the boreal forest are largely unknown, in part because of historically low anthropogenic development in these remote locations (Slattery et al 2011, Holopainen et al 2015. In the hemiboreal forest, a southern transitional zone of the boreal forest (Brandt 2009), many of the predicted changes for the more northerly continuous boreal forest zone are already occurring (MNDNR 2006).…”

Section: Introductionmentioning

confidence: 99%

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Nest and brood survival of Ring-necked Ducks in relation to anthropogenic development and wetland attributes

Roy¹

2018

ACE

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ABSTRACT. The boreal and hemiboreal forests are facing increasing anthropogenic development in areas that have traditionally been remote and inaccessible. Although these forests are recognized as important to breeding waterfowl, breeding season vital rates and the influence of anthropogenic development on these rates remain largely unexplored. I estimated nest and brood survival of Ring-necked Ducks (Aythya collaris) in the hemiboreal forest of Minnesota. I located 115 nests on 43 wetlands, radio-tagged 65 nesting hens, and monitored 32 broods. I considered the influence of distance to and density of buildings and roads, and road-surface type, as well as wetland characteristics and other variables hypothesized to influence waterfowl vital rates. The best-supported nest survival models included covariates for distance from the nest to nearest road and road-surface type. Nest survival declined with increasing distance from roads and was higher for nests near paved roads, at least when the distance was < 400 m. However, an interaction term in the topranked model suggested the effect of road type varied as a function of distance from nest. The model-averaged estimate of 35-day nest survival, based on the top two models was 0.278 (SE = 0.048). Brood survival increased with brood age and open water area, and decreased with nesting habitat area and distance from open water to nearest road. Cumulative brood survival to 30 days was 0.263 (SE = 0.035). These findings indicate that roads may influence both nest and brood survival. Furthermore, higher brood survival at wetlands with less nesting habitat area and more open water area may explain why hens move broods. Conservation managers should consider how habitat needs change throughout the breeding season to adequately address the needs of Ring-necked Ducks. Further study is needed to understand how anthropogenic development can be incorporated into conservation planning. Survie des nids et des couvées de Fuligules à collier en relation avec le développement d'origine anthropique et les caractéristiques des milieux humidesRÉSUMÉ. Les forêts boréales et hémi-boréales subissent une augmentation du développement d'origine anthropique dans des régions qui étaient autrefois éloignées et inaccessibles. Bien qu'on sache que ces forêts sont importantes pour la nidification de la sauvagine, les paramètres vitaux en saison de nidification et l'influence du développement d'origine anthropique sur ce groupe d'oiseaux demeurent grandement inexplorés. Les taux de survie de nids et de couvées de Fuligules à collier (Aythya collaris) ont été estimés dans la forêt hémi-boréale du Minnesota. Cent-quinze nids situés dans 43 milieux humides ont été localisés, 56 femelles nicheuses ont été équipées d'émetteurs radios et 32 couvées ont été suivies. L'effet de la distance et de la densité des bâtiments et des routes ont été examinés, tout comme le type de revêtement des routes, de même que les caractéristiques des milieux humides et d'autres variables pouvant influer les taux de survie de la s...

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“…Understanding the patterns of variation in nest survival and the mechanisms that give rise to these patterns therefore has the potential to be useful to managers of duck populations. Nest survival depends on a variety of factors including, but not limited to, the local assemblage of predators (Pieron and Rohwer , Amundson et al ), perceptibility of the nest to predators (Devries and Armstrong , Doherty et al ), nest age (Smith and Wilson ), distance and access to high quality foraging sites (Greenwood et al , Holopainen et al ), nesting density of concurrent species (Ringelman et al , Grant and Shaffer ), nest initiation date (Greenwood et al , Drever and Clark , Ringelman et al ), and annual variation in weather patterns (Skagen and Yackel‐Adams , Webb et al ). If management techniques can be identified that address any or all of the factors resulting in a change in nest survival, these tactics can be implemented to increase or decrease the productivity of a given species.…”

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confidence: 99%

Nest Site Selection Influences Cinnamon Teal Nest Survival in Colorado

Setash¹,

Kendall

Olson³

2020

J Wildl Manag

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Nest survival of ducks is partially a function of the spatiotemporal characteristics of the site at which a bird chooses to nest. Nest survival is also a fundamental component of population growth in waterfowl but is relatively unstudied for cinnamon teal (Spatula cyanoptera). We investigated cinnamon teal nest survival in a managed wetland complex in southern Colorado, USA, and assessed nest site selection to determine whether nest site characteristics were adaptive. We monitored 85 nests in 2015–2017 on Monte Vista National Wildlife Refuge, Colorado and did not detect a difference in nest survival across years. Based on nest site selection data from 2017, cinnamon teal selected nest sites characterized by a lower proportion of forbs than available sites. The relationships between habitat characteristics and nest survival were variable. Microhabitat characteristics exhibited only weak effects on nest survival during the laying stage. Nest survival during incubation was negatively related to the proportion of forbs at the nest site and, to a lesser extent, the proportion of grasses. Nest site selection was predictive of future nest survival based on the percent of forbs and grasses around the nest site, suggesting teal select nest locations to benefit reproductive success. These results have the potential to guide local habitat management actions for breeding waterfowl. © 2020 The Wildlife Society.

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Habitat use in ducks breeding in boreal freshwater wetlands: a review

Cited by 42 publications

References 135 publications

Comparison of Manual Mapping and Automated Object-Based Image Analysis of Non-Submerged Aquatic Vegetation from Very-High-Resolution UAS Images

Comparison of Manual Mapping and Automated Object-Based Image Analysis of Non-Submerged Aquatic Vegetation from Very-High-Resolution UAS Images

Nest and brood survival of Ring-necked Ducks in relation to anthropogenic development and wetland attributes

Nest Site Selection Influences Cinnamon Teal Nest Survival in Colorado

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