Changes in Redstart Breeding Territory

The Auk ◽  
1970 ◽  
Vol 87 (2) ◽  
pp. 359-361 ◽  
Keyword(s):  
Breeding Territory

scholarly journals Nesting of Great Cormorants (Phalacrocorax carbo) on man-made structures in Ukraine

2016 ◽  
Vol 24 (2) ◽  
Author(s):  
A. I. Sidorenko ◽  
V. D. Siokhin
Keyword(s):  
National Level ◽  
Field Work ◽  
Current Data ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
Breeding Sites ◽  
Breeding Territory ◽  
Wide Range ◽  
Maintenance Work ◽  
Great Cormorants

In Ukraine the Great Cormorant (Phalacrocorax carbo Linnaeus, 1758) uses a rather wide range of habitats for nesting: islands, trees and shrubs, reedbeds and a variety of man-made structures. In general, the strategy of nesting on man-made structures is uncommon both in Ukraine and Europe, and Cormorantsdo this only in the absence of other sites suitable for nesting. Special research onCormorant colonies on technogenic constructions was carried out during the field expeditions by the Research Institute of Biodiversity of Terrestrial and Aquatic Ecosystems of Ukraine in 2002–2003 and 2012–2016. Besides this, we used retrospective and current data from the literature and Internet resources. Most of the field work was carried out by making surveys by boat and on foot. As a result, we found 8 Cormorant colonies on technogenic constructions in Ukraine: gas platforms in the Sea of Azov (near the village Strilkove, Henichesk district of Kherson region); sunken ships – targets for bombing training near the Arabat Spit (these are also known as «ship islands»); electricity pylons of the high-voltage Enerhodar Dnipro Power Line where it crosses the Kakhovka Reservoir; the dock in Yahorlyk Bayk, used in the past as a target for bombing training bombing; artificial island-platforms on Lake Chernine (Kinburn Peninsula); an artificial island on the Sasyk Lagoon (Odessa region); artificial islands, made as navigation markers on the Kremenchuk and Kiev reservoirs. The study found that in most cases the accompanying species was the CaspianGull (Larus cachinnans Pallas, 1811), which actively destroys the Cormorants’ nests and eats their eggs and chicks. The number of nests in the colonies varied greatly (5–30 nests on the navigation marker islands and ca. 2 000–2 300 on the «ship-islands» and gas platforms). This is due, primarily, to the area of the breeding territory. The research found that fierce territorial competition was observed in most of the colonies both with Caspian Gulls and between Cormorants. In addition, we observed anthropogenic interference in the colonies by fishermen and workers conducting routine maintenance work (as happened in the case of electricity pylons and gas platforms). The benefit of this study is that it is the first research in Ukraine conducted at national level onthis type of nesting by Cormorants. Moreover, the study examines the history of emergence of these nesting territories and population dynamics of the Great Cormorant from the time of initial settlement of the breeding sites till the present.

Monitoring the effect of habitat loss on life-cycle aspects of the Masked Owl Tyto novaehollandiae in a semi-urban landscape

2020 ◽  
Vol 40 (4) ◽  
pp. 565-574
Author(s):  
Chris N. Thomson
Keyword(s):  
Site Fidelity ◽  
Large Scale ◽  
Urban Landscape ◽  
Negative Impact ◽  
Urban Expansion ◽  
Short Term ◽  
Breeding Activity ◽  
Breeding Territory ◽  
Term Monitoring

Long-term monitoring of the Masked Owl Tyto novaehollandiae in a semi-urban landscape before, during and after large-scale habitat removal identified a positive response in breeding activity in the short-term and a change in prey selectivity. Over the longer term, the loss in habitat had a negative impact on site fidelity. A pair of Masked Owls exhibited high fidelity to a particular breeding territory before and during the removal of large areas of habitat within this territory. Breeding success occurred over two consecutive seasons during the removal of known habitat and other disturbance events at which time the pair and their offspring were observed to exploit disturbed habitat and newly created forest edges in search of prey. Breeding activity was supported by an increased dietary focus on introduced rodents and other mammals displaced during habitat clearing. Fidelity to the breeding territory became more irregular post-disturbance and after two years the territory appeared to be abandoned. This response may suggest that the cumulative loss of habitat for established pairs as a result of urban expansion is likely to adversely affect reproductive success and site fidelity in the longer term.

Temporal and sex-specific patterns of breeding territory defense in a color-polymorphic cichlid fish

Hydrobiologia ◽  
2016 ◽  
Vol 791 (1) ◽  
pp. 237-245 ◽  
Author(s):  
Will Sowersby ◽  
Topi K. Lehtonen ◽  
Bob B. M. Wong
Keyword(s):  
Cichlid Fish ◽  
Territory Defense ◽  
Breeding Territory

scholarly journals Roosting behaviour of the endangered Sichuan Hill-partridge Arborophila rufipectus during the breeding season

2008 ◽  
Vol 18 (3) ◽  
pp. 260-266 ◽  
Author(s):  
Wenbo Liao ◽  
Jinchu Hu ◽  
Cao Li ◽  
Xin Lu
Keyword(s):  
Species Conservation ◽  
Tree Height ◽  
Primary Forest ◽  
Brooding Female ◽  
Adult Males ◽  
Broadleaf Forest ◽  
Breeding Territory ◽  
A Site ◽  
Trees And Shrubs ◽  
Median Height

AbstractRoosting behaviour in diurnal ground-dwelling birds is important to their conservation as they are particularly vulnerable to predation when on their roosts. In 2005, we studied the roosting behaviour of the globally ‘Endangered’ Sichuan Hill-partridge (Arborophila rufipectus) in Laojunshan Nature Reserve, southwest China, a site dominated by evergreen broadleaf forest. Our study showed that the birds roosted on elevated perches and roosting behaviour was associated with social organization. Breeding males roosted alone within their territories before mating or during the female's involvement in incubation, but at other times they roosted with the female bird. After hatching of the brood, the adult males roosted on the ground close to the brooding female for about two weeks. After this time the male left the female and chicks to roost elsewhere in the territory. High vegetation cover around the perch site was a key predictor of roosting sites for the partridges. Only six out of 84 tree and shrub species were typically used by the roosting birds, although individual roosting plants varied from night to night. The median height of roosting plants was 6.9 (3.8–10.5) m, which was significantly lower than many shrubs within the breeding territory. Perches were 1.7–6.4 (median = 2.7) m from the ground and independent of roost tree height, suggesting an optimum roosting height. The partridges preferred roosting sites with denser shrub vegetation. In terms of the species' conservation, our results highlight the importance of protecting primary forest that contains suitable roosting trees and shrubs.

Utilization of the Breeding Territory in the Black-Capped Chickadee

The Condor ◽  
1967 ◽  
Vol 69 (3) ◽  
pp. 259-267 ◽  
Author(s):  
Raymond A. Stefanski
Keyword(s):  
Breeding Territory

scholarly journals Song Learning by Chipping Sparrows: When, Where, and From Whom

The Condor ◽  
2006 ◽  
Vol 108 (3) ◽  
pp. 509-517 ◽  
Author(s):  
Wan-Chun Liu ◽  
Donald E. Kroodsma
Keyword(s):  
Social Interaction ◽  
Field Study ◽  
Laboratory Study ◽  
Young Male ◽  
Song Learning ◽  
Free Living ◽  
Breeding Territory ◽  
Study Sites ◽  
Spizella Passerina

Abstract Given the difficulty of following free-living, dispersing juvenile songbirds, relatively little is known about when, where, how, and from whom these young birds learn their songs. To explore these issues, we studied the Chipping Sparrow (Spizella passerina), males of which have a single, simple song, but populations of which may contain 20–30 different songs. In our western Massachusetts study sites, we color-banded 324 nestling and 32 fledgling sparrows. Twelve of these banded males returned to our study areas, dispersing a few hundred meters to 1.8 km away from their natal territories. The song of each yearling closely matched only one of his immediate neighbors on the breeding territory, revealing that a yearling sparrow precisely imitates one of his close neighbors after dispersal. Evidence from this field study and a previous laboratory study show that a young male is able to learn songs either during his hatching year or the following spring, perhaps depending on his chances of song exposure or social interaction with territorial neighbors.

scholarly journals Productivity of Black Oystercatchers: Effects of Recreational Disturbance in a National Park

The Condor ◽  
2006 ◽  
Vol 108 (3) ◽  
pp. 623-633 ◽  
Author(s):  
Julie A. Morse ◽  
Abby N. Powell ◽  
Michael D. Tetreau
Keyword(s):  
National Parks ◽  
National Park ◽  
Recreational Disturbance ◽  
Nest Sites ◽  
Daily Survival ◽  
Breeding Territory ◽  
Annual Productivity ◽  
Low Levels ◽  
Breeding Seasons ◽  
Territory Occupancy

Abstract National parks in Alaska are generally assumed to be high-quality, undisturbed wildlife habitats. However, these parks attract recreational users, whose presence may reduce the suitability of key habitats for nesting shorebirds. In Kenai Fjords National Park, Black Oystercatchers (Haematopus bachmani) often breed on gravel beaches that are also popular campsites. In this study, we examined the effects of recreational activities in coastal Alaska on reproductive performance of Black Oystercatchers. We monitored survival of nests and chicks on 35 to 39 breeding territories annually during four breeding seasons (2001–2004). Most recreational disturbance on these territories occurred after the peak hatching date of first clutches. Annual productivity was low (average of 0.35 chicks per pair), but was not strongly affected by recreational disturbance. Daily survival of nests varied annually and declined over the season. Our results suggest that nest survival was lower during periods of extreme high tides. Daily survival rate of broods increased over the season and was higher on island than mainland territories, likely due to differences in predator communities. Territory occupancy rate and site fidelity were high; 95% of color-banded oystercatchers returned to the same breeding territory in the subsequent year. We conclude that Black Oystercatchers are resilient to low levels of recreational disturbance. However, in light of projected increases in recreation, we suggest managers move campsites away from the traditional nest sites identified in this study to minimize future disturbances.

Territory size and polygyny in the spotless starling: resource-holding potential or social inertia?

2001 ◽  
Vol 79 (11) ◽  
pp. 1951-1956 ◽  
Author(s):  
José P Veiga ◽  
Juan Moreno ◽  
Pedro J Cordero ◽  
Eduardo Mínguez
Keyword(s):  
Breeding Success ◽  
Territory Size ◽  
First Year ◽  
Female Reproduction ◽  
Resource Holding Potential ◽  
Nest Boxes ◽  
Breeding Territory ◽  
Territory Acquisition ◽  
Contradictory Evidence

In male birds that base their acquisition of mates on the defence of resources essential for female reproduction, the size or quality of the territory decisively affects polygyny rate and breeding success. However, there is contradictory evidence concerning the importance of resource-holding potential (RHP) versus factors not related to individual quality on between-year consistency in territory occupancy and hence on long-term reproductive success. We manipulated the aggressiveness (a major determinant of RHP) of male spotless starlings (Sturnus unicolor) by means of androgens and antiandrogens to investigate the importance of RHP in breeding-territory acquisition and maintenance, polygyny rate, and breeding success over 3 years (1996–1998). The number of males that held a territory for the first time was high in 1996 with respect to the year before the experiment began. Most of these males still bred in the colony during the third study year, though new owners established territories to the detriment of the former males, especially in 1998. Manipulation of testosterone activity during the first year affected the number of nest boxes defended by males and also the number of mates gained and the number of successful breeding attempts made throughout the 3 study years. The results were in the expected direction: an increase in testosterone activity led to greater success. The results suggest that RHP may be important in the acquisition of territory and mates, at least under conditions of recently established interindividual relationships. However, social inertia, i.e., the maintenance of dominance status irrespective of changes in RHP, seems to be of crucial importance in the long-term maintenance of territory resources and polygyny rates.

scholarly journals An experimental test of whether pied flycatchers choose the best territory for rearing the young

2015 ◽  
Vol 61 (4) ◽  
pp. 604-613 ◽  
Author(s):  
Elina Mäntylä ◽  
Päivi M. sirkiä ◽  
Tero Klemola ◽  
Toni Laaksonen
Keyword(s):  
Free Choice ◽  
Ficedula Hypoleuca ◽  
Habitat Characteristics ◽  
Territory Quality ◽  
Long Distance ◽  
Invertebrate Prey ◽  
Nest Sites ◽  
Breeding Territory ◽  
Essential Question ◽  
The Right

Abstract It is often assumed that birds are able to choose a breeding territory that will later on have the most food for nestlings. Studies on this essential question are, however, few. We studied territory choice of a long-distance migrant, the pied flycatcher Ficedula hypoleuca in southwestern Finland. In one study area, we monitored the territory choice of males via the order of territory settlement. Female territory choice was studied experimentally in another study area where the correlation between male and territory quality was removed by not allowing males a free choice of territory. We defined several habitat characteristics and estimated the abundances of invertebrate prey from air, ground and trees with appropriate traps from the surroundings of the nest sites in both study areas. Against the expectation that parent birds would choose an arthropod-rich territory, neither males nor females seemed to choose those territories that later had the most food for nestlings. There was, however, some evidence that more eggs were laid in territories with more aphids and that more fledglings were produced in territories with high ant abundance. Our findings thus suggest that while it would be beneficial for birds to be able to choose food-rich territories, they may not be able to detect the right cues for doing so early in the breeding season. The possibility and importance of detecting the territories with the best prospects of rearing young may, however, vary among and within seasons and more studies on this topic are clearly needed.

Sign in / Sign up

Export Citation Format

Share Document