Population Trends and Conservation Status of Forest Birds

2018 ◽  
pp. 389-426 ◽  
Author(s):  
Aleksi Lehikoinen ◽  
Raimo Virkkala
Keyword(s):  
Conservation Status ◽  
Forest Birds ◽  
Population Trends

scholarly journals Determining population trends and conservation status of the common quail (Coturnix coturnix) in Western Europe

2012 ◽  
Vol 35 (2) ◽  
pp. 343-352
Author(s):  
M. Puigcerver ◽  
◽  
F. Sardà–Palomera ◽  
J. D. Rodriguez-Teijeiro ◽  
◽  
...  
Keyword(s):  
Western Europe ◽  
Conservation Status ◽  
Population Trends ◽  
Distribution Model ◽  
Breeding Period ◽  
Distribution Models ◽  
Winter Cereal ◽  
Coturnix Coturnix ◽  
The Common ◽  
Common Quail

In this paper we review the conservation status and population trends of the common quail (Coturnix coturnix) from 1900 to the present. Data are sometimes contradictory with regard to the status of this species as it has some features that make it difficult to produce reliable population estimates. Recent data clearly suggest, either at a local scale or at a trans–national scale, that the Atlantic common quail populations have remained stable in the last two decades, and that restocking practices with farm–reared quails (hybrids with the Japanese quail, Coturnix japonica) do not affect our estimates. The complex movement patterns showed by this species require special attention. Analysis of ring recoveries can give important information, especially about the nomadic movement of quails in search of suitable habitats after the destruction of winter cereal crops due to harvesting. Thus, when developing a breeding distribution model for this species, continuously updated information on seasonal habitat and weather must be included for optimal prediction. Including fortnightly data of vegetation indices in distribution models, for example, has shown good results. Obtaining reliable predictions about changes in species distribution and movements during the breeding period could provide useful knowledge about the conservation status and population trends and would help in the design of future management measures.

scholarly journals Population trends and conservation status of the Northern Rockhopper PenguinEudyptes moseleyiat Tristan da Cunha and Gough Island

2009 ◽  
Vol 19 (1) ◽  
pp. 109-120 ◽  
Author(s):  
RICHARD CUTHBERT ◽  
JOHN COOPER ◽  
MARIE-HELENE BURLE ◽  
CONRAD J. GLASS ◽  
JAMES P. GLASS ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Conservation Status ◽  
Sharp Decrease ◽  
Population Trends ◽  
Tristan Da Cunha ◽  
Fur Seals ◽  
Introduced Predators ◽  
Gough Island ◽  
The Indian Ocean ◽  
The Impact

SummaryPopulations of the recently split Northern Rockhopper PenguinEudyptes moseleyiare restricted to Tristan da Cunha and Gough Island in the South Atlantic, and Amsterdam and St Paul in the Indian Ocean. The majority of the population is in the Atlantic (> 80%), but population trends at Tristan da Cunha and Gough are uncertain. Early records indicate “millions” of penguins used to occur at Tristan da Cunha and Gough Island. The most recent estimates indicate declines in excess of 90% for both Gough and the main island of Tristan that have occurred over at least 45 and 130 years, respectively. Numbers breeding at Inaccessible and Nightingale islands (TDC) also may have declined since the 1970s, albeit modestly, whereas numbers on Tristan appear stable over the last few decades. Current population estimates are 32,000–65,000 pairs at Gough, 18–27,000 at Inaccessible, 19,500 at Nightingale, and 3,200–4,500 at Tristan. Numbers and trends at Middle Island (TDC) are unknown. Middle Island supported an estimated 100,000 pairs in 1973, and recent observations suggest this colony is being impacted by competition for space with recently recolonising Subantarctic Fur SealsArctocephalus tropicalis. Past human exploitation and the impact of introduced predators may be responsible for the historical decline in numbers at Tristan, but these factors cannot explain the sharp decrease (since the 1950s) at Gough Island. Overall, declines at Gough, Tristan, Nightingale and Inaccessible islands indicate a three-generation decline of > 50%. Taken in combination with recent decreases in Indian Ocean populations, the Northern Rockhopper Penguins is now categorised as globally ‘Endangered’. Determining the causal factors responsible for these recent declines is an urgent priority.

scholarly journals A 10-year assessment of Asian Houbara Bustard populations: trends in Kazakhstan reveal important regional differences

2010 ◽  
Vol 21 (2) ◽  
pp. 134-141 ◽  
Author(s):  
SAMUEL RIOU ◽  
JACKY JUDAS ◽  
MARK LAWRENCE ◽  
SERGUEI POLE ◽  
OLIVIER COMBREAU
Keyword(s):  
Regional Differences ◽  
Conservation Status ◽  
Breeding Birds ◽  
Population Trends ◽  
Sharp Decline ◽  
Sharp Drop ◽  
North East ◽  
Houbara Bustard ◽  
Steep Decline ◽  
Variable Population

SummaryA sharp decline in the numbers of Asian Houbara Bustard Chlamydotis macqueenii towards the end of the 20th century raised concerns about the conservation status of this species. Yet due to its large breeding range in the remote steppes and deserts of Central Asia and to its cryptic behaviour, it has been difficult to obtain enough comparable data to make reliable estimates of population trends. Here, we present the results of 10 years of extensive biannual surveys throughout southern Kazakhstan, considered to host the majority of the breeding birds in Asia, and we discuss trends in the Kazakh populations for the first decade of this century. The breeding Houbara population has generally declined over the greater part of Kazakhstan between 2000 and 2009 but with important regional differences. A steep decline was observed in north-east Caspian and Karakum, and a sharp drop followed by a stabilisation occurred in Kyzylkum. Over the same period, estimated densities were stable or increased in the area surrounding Lake Balkash, and increased in the Betpak-Dala region of central Kazakhstan. Autumn surveys showed more variability and revealed little decline overall. It was also clear that Betpak-Dala and Balkash regions hosted the largest populations. Our findings suggest that it is a complex undertaking to assign a level of vulnerability for this species as a whole. Highly variable population trends between regions indicate that threats and pressures are to a considerable extent region-specific, and that conservation measures need to be adjusted locally.

scholarly journals Tendencias poblacionales recientes de la avutarda hubara en las Islas Canarias: análisis metodológico y estado de conservación

2012 ◽  
Vol 35 (1) ◽  
pp. 125-139
Author(s):  
C. Schuster ◽  
◽  
J. J. Iglesias-Lebrija ◽  
L. M. Carrascal ◽  
◽  
...  
Keyword(s):  
Canary Islands ◽  
Conservation Status ◽  
Distance Sampling ◽  
Small Variation ◽  
Population Trends ◽  
Line Transect ◽  
Sampling Area ◽  
Average Value ◽  
Houbara Bustard ◽  
Population Sizes

Recent population trends of the houbara bustard in the Canary Islands. Methods and conservation status Determining conservation status requires rigorous and reliable data about population sizes and trends, especially if they have to be applied to islands where the species have small populations. The Canary bustard houbara (Chlamydotis undulata fuertaventurae) is catalogued as ‘in danger’ by the Red Book of the Birds of Spain. This work analyzes the value of previously published information on the species using the method of adjacent linear transects separated by 200 m, as a baseline for establishing robust population trends in 30 important areas (ranging from 1.3 to 12.8 km2) for the houbara in the islands of Lanzarote and Fuerteventura (Canary Islands). Censuses were repeated on the same dates (from November to December) and localities as those carried out in 1994, 2004 and 2006. The detection probability of the houbara was estimated by means of distance sampling, being 0.42 up to 250 m from the observer, and 0.82 in the main census belt of 100 m on either side of the line transect. The method of adjacent linear transects —counting the maximum number of hubaras detected— provides accurate figures of population densities (detection of 95.2% of the birds). The previous estimations of houbara densities can therefore be considered highly trustworthy, with a probable average underestimation of only 5 %. Nevertheless, the confidence intervals of density estimations using only one census were very large. Therefore, with only one census per sampling area and year it is not possible to obtain precise estimates of houbara densities with small variation around the average value. This raises concern when trying to obtain solid evidence about the increases–decreases of houbara populations comparing different dates or study areas. The density of the Canary Island hubara bustard decreased significantly from 2004/2006 to 2011 in eight areas of Fuerteventura (Vega Vieja, Los Alares–Pocetas, Matas Blancas, Lorenzo– Diviso, Corralejo, Lajares and Fimapaire) and in two areas of Lanzarote (Argana and La Santa). Conversely, the density of the houbara significantly increased in three areas of Lanzarote (Zonzamas, Guatiza and Llano de las Maretas). As a whole, average population density did not differ significantly between 2004/2006 and 2011 in Fuerteventura (slight decrease of 29% in 2011), but there was a significant increase in Lanzarote (increase of 60% from 2004/2006 to 2011). The change in density from 2004/2006 to 2011 tended to be an increase in areas further from paved roads, and a decrease in locations predominantly covered by loose sandy soils.

scholarly journals To ornitofauna of the maniforated forestry of the Kharkov region

2019 ◽  
Vol 30 (1) ◽  
pp. 56-61
Author(s):  
V. V. Pesotskaya
Keyword(s):  
Conservation Status ◽  
Bird Species ◽  
Forest Birds ◽  
Ecological Groups ◽  
Berne Convention ◽  
Fringilla Coelebs ◽  
Dense Forest ◽  
Synanthropic Species ◽  
Forest Belts ◽  
Protective Forest

Modern forest belts are a large, complex and important part of the biosphere. The unique biocenoses in which specific ornithocomplexes are formed which include birds of different ecological groups are and feed on synanthropic species, birds of the forest, birds of the fields. The aim of the research is to study the features of the formation of ornithocomplexes of different (maple-ash purge forest belts, mixed dense forest belts, acacia purge forest belts, maple-lime openwork forest belts) protective forest belts within the Kharkiv region. In the course of the research we have registered 44 species of birds belonging to 8 rows Falconiformes, Galliformes, Columbiformes, Cuculiformes, Upupiformes, Piciformes, Passeriformes, Ciconiiformes. The formation of ornithocomplexes of protective forest belts depends on various factors. Outstanding is the phytocoenotic composition of forest belts and age structure of plantations. Settling of birds in shelterbelts afforestation occurs gradually, with the growth of trees and change conditions of the biocenosis.  The avifauna of maple-ash-tree scavenging forest belts is represented by 39 species of birds. Dominant and subdominant are: ficedula albicollis Temm., Fringilla coelebs L. In mixed shelterbelts purge nest 38 species of birds, is during foraging 2 types. Mixed dense forest belts inhabit 44 species of birds, biodiversity is associated with the floristic composition of the forest belt with significant density and well-formed undergrowth compared to other forest belts. Avifauna gorobinci purge belts are 26 species of birds. Ornithocomplex maple-lime fishnet shelterbelts are 41 species of birds. Analyzing the features of the formation of avifauna of forest belts, it can be argued that these biotopes are inhabited by birds of different ecological groups, biotopes, synanthropic species, birds of the forest, birds of the fields, are able to form unique biotopes. Therefore, field-protective forest plantations combined complex ecosystems. Analyzing the index of similarity of biodiversity of different types of forest belts, it can be argued that the most similar in species composition of birds are mixed dense forest belts and maple-lime openwork forest belts (jacquard Index – 93.1 and Serensen index 96.4) and maple-ash scavenging forest belts with mixed scavenging forest belts (jacquard Index-92.6 and Serensen index 96.2). Determined the relative numbers of registered types for zaplanovano classification V. P. Balka (2009): the most numerous Chaffinch (Fringilla coelebs L.), Zelenyak (Chloris chloris L.), goldfinch (Carduelis carduelis L.), Linnet (Acanthis cannabina L.), song thrush (Turdus philomelos Brehm.), sorokopud of thorns (Lanius collurio L.), Nightingale (Luscinia luscinia L), magpie (Pica pica L.), grey crow (Corvus cornix L.). Rare species are common berestyanka(Hippolais icterina L.), common Buzzard (Buteo buteo L.), common urticaria (Sylvia nisoria L.). The nature protection status of certain bird species is analyzed. 1 species listed in the Red book of Ukraine, 2 species In the red list of Kharkiv region. 2 types to the Washington Convention. Berne Convention Annex II (BC2) – 23 species, Berne Convention Annex III (BC3) – 13 species of birds, Bonn Convention Annex II (Bu2) – 10 species, Bonn Convention Annex I (BO1) – 2 species and 6 species of birds have no conservation status.

scholarly journals Preserving an obscure bird: achievements and future challenges of Corncrake (Crex crex Linnaeus, 1758) conservation in Hungary

2016 ◽  
Vol 24 (2) ◽  
pp. 1-17
Author(s):  
István Szentirmai ◽  
Sándor András Boldogh ◽  
Károly Nagy ◽  
Béla Habarics ◽  
Tibor Szép
Keyword(s):  
Protected Areas ◽  
Protected Area ◽  
Conservation Management ◽  
Conservation Status ◽  
Population Trends ◽  
Protected Species ◽  
Breeding Sites ◽  
Future Challenges ◽  
Research Findings ◽  
Extract Information

Abstract The Corncrake is a strictly protected species in Hungary and a qualifying species of many Natura 2000 sites. Despite its Least concern global conservation status, it receives much attention and was elected as “Bird of the Year” by MME BirdLife Hungary in 2016. In this paper, we estimate its population trends and analyse the suitability of the protected area system and agri-environment schemes for the species. We compiled information on major threatening factors and conservation measures applied for the species. We reviewed international publications on the ecology and conservation management of the species to extract information for practical conservation. We estimated that 500–2000 pairs of Corncrakes breed in Hungary. Although their breeding sites are well covered by protected areas, Natura 2000 sites (42%) and High Nature Value Areas (67%), their population has declined by 55% over the last 20 years. We found that most of the major threatening factors are addressed by conservation management, and appropriate measures are applied in most cases. Recent research findings and recommendations by the BirdLife International Corncrake Conservation Team suggest that mowing of grasslands around nesting places should be delayed until 1–15 August either in the entire field or at least on 2 hectares around nests. Prescriptions of agri-environment schemes should also be adjusted to the above requirements and more farmers should be encouraged to enrol in Corncrake conservation programmes. We strongly suggest that more emphasis should be devoted to combat important threats for the most important breeding sites such as aridification and flooding.

scholarly journals Annual adult survival drives trends in Arctic-breeding shorebirds but knowledge gaps in other vital rates remain

The Condor ◽  
2020 ◽  
Vol 122 (3) ◽  
Author(s):  
Emily L Weiser ◽  
Richard B Lanctot ◽  
Stephen C Brown ◽  
H River Gates ◽  
Joël Bêty ◽  
...  
Keyword(s):  
Large Scale ◽  
Conservation Status ◽  
Population Trends ◽  
Adult Survival ◽  
Demographic Model ◽  
Population Bottlenecks ◽  
Vital Rates ◽  
Population Surveys ◽  
Scale Population ◽  
Management Priorities

Abstract Conservation status and management priorities are often informed by population trends. Trend estimates can be derived from population surveys or models, but both methods are associated with sources of uncertainty. Many Arctic-breeding shorebirds are thought to be declining based on migration and/or overwintering population surveys, but data are lacking to estimate the trends of some shorebird species. In addition, for most species, little is known about the stage(s) at which population bottlenecks occur, such as breeding vs. nonbreeding periods. We used previously published and unpublished estimates of vital rates to develop the first large-scale population models for 6 species of Arctic-breeding shorebirds in North America, including separate estimates for 3 subspecies of Dunlin. We used the models to estimate population trends and identify life stages at which population growth may be limited. Our model for the arcticola subspecies of Dunlin agreed with previously published information that the subspecies is severely declining. Our results also linked the decline to the subspecies’ low annual adult survival rate, thus potentially implicating factors during the nonbreeding period in the East Asian–Australasian Flyway. However, our trend estimates for all species showed high uncertainty, highlighting the need for more accurate and precise estimates of vital rates. Of the vital rates, annual adult survival had the strongest influence on population trend in all taxa. Improving the accuracy, precision, and spatial and temporal coverage of estimates of vital rates, especially annual adult survival, would improve demographic model-based estimates of population trends and help direct management to regions or seasons where birds are subject to higher mortality.

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