scholarly journals Remotely sensed forest understory density and nest predator occurrence interact to predict suitable breeding habitat and the occurrence of a resident boreal bird species

2020 ◽  
Vol 10 (4) ◽  
pp. 2238-2252
Author(s):  
Julian Klein ◽  
Paul J. Haverkamp ◽  
Eva Lindberg ◽  
Michael Griesser ◽  
Sönke Eggers
Keyword(s):  
Bird Species ◽  
Remotely Sensed ◽  
Breeding Habitat ◽  
Forest Understory ◽  
Nest Predator

scholarly journals Patterns of bird species richness explained by annual variation in remotely sensed Dynamic Habitat Indices

2021 ◽  
Vol 127 ◽  
pp. 107774
Author(s):  
Martina L. Hobi ◽  
Laura S. Farwell ◽  
Maxim Dubinin ◽  
Dmitrij Kolesov ◽  
Anna M. Pidgeon ◽  
...  
Keyword(s):  
Species Richness ◽  
Annual Variation ◽  
Bird Species ◽  
Remotely Sensed ◽  
Bird Species Richness ◽  
Dynamic Habitat

Bird species diversity in forest understory: Analysis of mist-net samples

Oecologia ◽  
1976 ◽  
Vol 25 (4) ◽  
pp. 373-379 ◽  
Author(s):  
Mary F. Willson ◽  
David J. Moriarty
Keyword(s):  
Species Diversity ◽  
Bird Species ◽  
Forest Understory ◽  
Bird Species Diversity ◽  
Mist Net

scholarly journals Model-Assisted Bird Monitoring Based on Remotely Sensed Ecosystem Functioning and Atlas Data

2020 ◽  
Vol 12 (16) ◽  
pp. 2549 ◽  
Author(s):  
Adrián Regos ◽  
Pablo Gómez-Rodríguez ◽  
Salvador Arenas-Castro ◽  
Luis Tapia ◽  
María Vidal ◽  
...  
Keyword(s):  
Life History ◽  
Energy Balance ◽  
Species Distribution ◽  
Ecosystem Functioning ◽  
Life History Traits ◽  
Vegetation Index ◽  
Bird Species ◽  
Remotely Sensed ◽  
Distribution Models ◽  
Atlas Data

Urgent action needs to be taken to halt global biodiversity crisis. To be effective in the implementation of such action, managers and policy-makers need updated information on the status and trends of biodiversity. Here, we test the ability of remotely sensed ecosystem functioning attributes (EFAs) to predict the distribution of 73 bird species with different life-history traits. We run ensemble species distribution models (SDMs) trained with bird atlas data and 12 EFAs describing different dimensions of carbon cycle and surface energy balance. Our ensemble SDMs—exclusively based on EFAs—hold a high predictive capacity across 71 target species (up to 0.94 and 0.79 of Area Under the ROC curve and true skill statistic (TSS)). Our results showed the life-history traits did not significantly affect SDM performance. Overall, minimum Enhanced Vegetation Index (EVI) and maximum Albedo values (descriptors of primary productivity and energy balance) were the most important predictors across our bird community. Our approach leverages the existing atlas data and provides an alternative method to monitor inter-annual bird habitat dynamics from space in the absence of long-term biodiversity monitoring schemes. This study illustrates the great potential that satellite remote sensing can contribute to the Aichi Biodiversity Targets and to the Essential Biodiversity Variables framework (EBV class “Species distribution”).

scholarly journals How Different Landscape Elements Limit the Breeding Habitat of Meadow Bird Species

Ardea ◽  
2010 ◽  
Vol 98 (2) ◽  
pp. 203-209 ◽  
Author(s):  
Roland E. van der Vliet ◽  
Jerry van Dijk ◽  
Martin J. Wassen
Keyword(s):  
Bird Species ◽  
Breeding Habitat ◽  
Landscape Elements

scholarly journals Severe recent decrease of adult body mass in a declining insectivorous bird population

2014 ◽  
Vol 281 (1786) ◽  
pp. 20140649 ◽  
Author(s):  
Sébastien Rioux Paquette ◽  
Fanie Pelletier ◽  
Dany Garant ◽  
Marc Bélisle
Keyword(s):  
Body Mass ◽  
Habitat Quality ◽  
Bird Species ◽  
Migratory Bird ◽  
Breeding Habitat ◽  
Tree Swallow ◽  
Adult Body Mass ◽  
Agricultural Intensity ◽  
Carry Over ◽  
Substantial Decline

Migratory bird species that feed on air-borne insects are experiencing widespread regional declines, but these remain poorly understood. Agricultural intensification in the breeding range is often regarded as one of the main drivers of these declines. Here, we tested the hypothesis that body mass in breeding individuals should reflect habitat quality in an aerial insectivore, the tree swallow ( Tachycineta bicolor ), along a gradient of agricultural intensity. Our dataset was collected over 7 years (2005–2011) and included 2918 swallow captures and 1483 broods. Analyses revealed a substantial decline of the population over the course of the study (−19% occupancy rate), mirrored by decreasing body mass. This trend was especially severe in females, representing a total loss of 8% of their mass. Reproductive success was negatively influenced by intensive agriculture, but did not decrease over time. Interestingly, variation in body mass was independent of breeding habitat quality, leading us to suggest that this decline in body mass may result from carry-over effects from non-breeding areas and affect population dynamics through reduced survival. This work contributes to the growing body of evidence suggesting that declines in migratory aerial insectivores are driven by multiple, complex factors requiring better knowledge of year-round habitat use.

scholarly journals Efecto de la estacionalidad y lluvias en la avifauna del Chaco Serrano Austral, Argentina

2017 ◽  
Vol 65 (3) ◽  
pp. 953
Author(s):  
Gustavo Alfredo Fava ◽  
Juan Carlos Acosta ◽  
Graciela Mirta Blanco
Keyword(s):  
Bird Species ◽  
Reproductive Activity ◽  
Breeding Habitat ◽  
Bird Abundance ◽  
Group Management ◽  
Natural Park ◽  
Chaco Serrano ◽  
Site Survey ◽  
Migrant Bird ◽  
Resident Bird

In subtropical regions like the Chaco Serrano (33° S), rainfall has a marked seasonality, and water flood, caused by heavy rains, may have important consequences for dependent ecosystems. Conversely, the high pressure on available resources during dry periods can also affect the fauna diversity and distribution. Even though birds have shown to be excellent ecological indicators of these shifts in the environment, currently little is known about the avifauna of the Argentine Chaco Serrano phytogeographic district. Our aim was to study the resident bird population status in the Southern Chaco Serrano, its fluctuations in richness and abundance, and its relationship to seasonal variations, in monthly and annual hydroperiods. In order to assess the resident bird status over a two year period (2011 Mar.-2013 Feb.) we carried out 18 sampling surveys during pre-breeding (spring), breeding (summer) and non breeding periods (autumn-winter), in the Northeastern part of the Valle Fértil Natural Park, San Juan province, Argentina. During each site survey, we recorded bird assemblages found in six transects, and obtained bird abundance and species diversity. A mixed general linear model was employed to evaluate relationships between the studied variables. We found a total of 98 species of birds belonging to 33 families (44 resident species, 23 spring visitors, six summer visitors, two winter visitors and 23 with scarce registers). We also registered 68 of these species in both hydroperiods, 28 only during rainy periods and only two during the dry period. Both richness and abundance showed the highest values during the pre-breeding and rainy seasons, while different tendencies were detected during the isolated monthly rainfalls. These changes in bird densities were associated with the arrival of migratory species, mainly spring visitors, and probably in relationship with their reproductive activity, and to seasonal fluctuations in food resources. The Southern Chaco Serrano is a subtropical semiarid place that seems to be an important breeding habitat for many migrant bird species, which in turn promoted seasonal changes in species density and diversity, mainly during rainy years. This work contributed to our understanding on the causes of richness and abundance variations on birds, and will contribute to this important group management and conservation in this area.

scholarly journals Experimentally induced antipredator responses are mediated by social and environmental factors

2019 ◽  
Vol 30 (4) ◽  
pp. 986-992 ◽  
Author(s):  
Frank Groenewoud ◽  
Sjouke A Kingma ◽  
Kat Bebbington ◽  
David S Richardson ◽  
Jan Komdeur
Keyword(s):  
Predation Risk ◽  
Nest Predation ◽  
Bird Species ◽  
Ecological Factors ◽  
Antipredator Defense ◽  
Trade Offs ◽  
Future Reproduction ◽  
Female Investment ◽  
Predator Model ◽  
Nest Predator

AbstractNest predation is a common cause of reproductive failure for many bird species, and various antipredator defense behaviors have evolved to reduce the risk of nest predation. However, trade-offs between current reproductive duties and future reproduction often limit the parent’s ability to respond to nest predation risk. Individual responses to experimentally increased nest predation risk can give insights into these trade-offs. Here, we investigate whether social and ecological factors affect individual responses to predation risk by experimentally manipulating the risk of nest predation using taxidermic mounts in the cooperative breeding Seychelles warbler (Acrocephalus sechellensis). Our results show that dominant females, but not males, alarm called more often when they confront a nest predator model alone than when they do so with a partner, and that individuals that confront a predator together attacked more than those that did so alone. Dominant males increased their antipredator defense by spending more time nest guarding after a presentation with a nest predator, compared with a nonpredator control, but no such effect was found for females, who did not increase the time spent incubating. In contrast to incubation by females, nest guarding responses by dominant males depended on the presence of other group members and food availability. These results suggest that while female investment in incubation is always high and not dependent on social and ecological conditions, males have a lower initial investment, which allows them to respond to sudden changes in nest predation risk.

Effects of Plant Species and Foliage Structure on the Foraging Behavior of Forest Birds

The Auk ◽  
1984 ◽  
Vol 101 (4) ◽  
pp. 672-684 ◽  
Author(s):  
Scott K. Robinson ◽  
Richard T. Holmes
Keyword(s):  
Plant Species ◽  
Tree Species ◽  
Escape Behavior ◽  
Bird Species ◽  
Leaf Size ◽  
Forest Understory ◽  
Attack Behavior ◽  
Foraging Patterns ◽  
White Ash ◽  
Foliage Structure

Abstract We quantified the behavior of four species of passerine birds foraging for arthropods among the foliage of different plant species and vertical strata of a northern hardwoods forest in New Hampshire (USA). Two species (Vireo olivaceus and Setophaga ruticilla) often changed their foraging patterns among strata but not among tree species, except in white ash. In the latter, both species flew more frequently between perches while searching for prey, which reflects the more open canopy and sparser distribution of ash foliage. A third species (Vireo philadelphicus) was stereotyped in its search and attack methods but had variable attack rates, indicating greater foraging success in some microhabitats than in others. The fourth species (Dendroica caerulescens), which inhabits the forest understory, showed few significant differences in its search or attack behavior, despite considerable variety in the sizes, shapes, and arrangements of leaves among available plant species. The foraging patterns of S. ruticilla were further influenced by differences among tree species in the abundance of a major prey type (leafhoppers, Cicadellidae: Homoptera) and by the active escape behavior of those prey. We conclude that these four bird species, all of which search leaves at a distance and fly up to hover or snatch arthropod prey from leaf surfaces, are relatively unaffected by details of foliage structure such as leaf size, shape, petiole length, and arrangement on twigs. The distribution of foliage within a plant, however, and, in some cases, the abundance of certain food resources do differentially influence the foraging tactics and capture success of these species. Because foliage distribution and arthropod availability both vary with plant species, the floristics of a site will strongly influence the "foraging opportunities" available to birds and therefore their success in exploiting particular habitats.

Habitat openness and edge avoidance predict Saltmarsh Sparrow abundance better than habitat area

The Condor ◽  
2020 ◽  
Vol 122 (3) ◽  
Author(s):  
Hallie Marshall ◽  
Erik J Blomberg ◽  
Valerie Watson ◽  
Meaghan Conway ◽  
Jonathan B Cohen ◽  
...  
Keyword(s):  
Population Decline ◽  
Bird Species ◽  
Breeding Habitat ◽  
Tidal Marshes ◽  
Bird Abundance ◽  
Marsh Edge ◽  
Marsh Bird ◽  
Saltmarsh Sparrow ◽  
Habitat Features ◽  
Better Than

Abstract The Saltmarsh Sparrow (Ammospiza caudacuta) is a tidal marsh bird facing rapid population decline throughout its range, largely caused by degradation and loss of breeding habitat. Thus, there is a need to preserve tidal marshes in the northeastern United States, but to do so requires an understanding of the habitat features that support robust populations. Previous studies have shown Saltmarsh Sparrow abundance increases with marsh size, but in similar bird species, area sensitivity is more directly linked to edge avoidance. Whether additional landscape features affect the abundance of Saltmarsh Sparrows is unknown. We explored how the height of objects on the horizon, an index of habitat openness, affected the abundance of Saltmarsh Sparrows. Our primary goal was to determine whether the angle to the highest point on the horizon (“angle to maximum horizon”) predicted abundance better than marsh area or distance to the marsh edge. We used N-mixture models to evaluate the combination of spatial factors that best predicted Saltmarsh Sparrow abundance while also accounting for survey-level variables that could influence detection probability. We found that the interaction between distance to edge and angle to maximum horizon best predicted abundance. Taller objects on the horizon were negatively correlated with bird abundance, and this effect was strongest within 50 m of the marsh edge. When we considered the predictive powers of patch area, distance to edge, and angle to maximum horizon individually, angle to maximum horizon was the best single predictor. We found the highest abundance of Saltmarsh Sparrows at point locations where the angle to maximum horizon was 0.0°, and at angles greater than 12° the predicted abundance fell below 1 bird per survey point. We propose that managers should prioritize marsh openness and experimentally test the effect of marsh edge manipulations when making conservation decisions for this rapidly declining species.

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