scholarly journals Population status and distribution of Taita White-eye Zosterops silvanus in the fragmented forests of Taita Hills and Mount Kasigau, Kenya

2007 ◽  
Vol 17 (2) ◽  
pp. 141-150 ◽  
Author(s):  
Ronald K Mulwa ◽  
Leon A Bennun ◽  
Callistus K. P. O. Ogol ◽  
Luc Lens
Keyword(s):  
Bird Species ◽  
Small Population ◽  
Forest Fragments ◽  
Population Status ◽  
Conservation Action ◽  
Taita Hills ◽  
Line Transects ◽  
Indigenous Trees ◽  
Fragmented Forests ◽  
Dry Woodland

AbstractOur study focused on the Taita White-eye Zosterops silvanus, one of three bird species endemic to the Taita Hill forests, south-east Kenya. Formerly considered Critically Endangered, Taita White-eye has been down-listed to Endangered following the findings of this study. Between November 1998 and September 1999 we counted this species along line transects to establish their current population status and distribution in its entire range. White-eye censuses were conducted in nine forest fragments of the Taita Hills and the virtually undisturbed Mt Kasigau forest. The total global population of Taita White-eyes was estimated to be c. 7,100 birds. Mt Kasigau was shown to be the species' main stronghold, maintaining a very high density (26 birds ha−1) and holding 80% (5,600 individuals) of the entire population. In the Taita Hills forests, densities were consistently higher in the small isolated fragments than in the large ones, though the former held only a small population (3% of total). At Mt Sagala, a large isolated block where indigenous trees have been largely replaced with exotic plantation, this species was not encountered. We found no evidence of interchange between the White-eye populations on Mt Kasigau and the Taita Hills forests, probably because of the separation by a low-altitude, dry woodland habitat barrier. While prioritization for conservation action should focus more on the Taita Hills forest fragments, Mt Kasigau should be treated as fragile ecosystem which holds a huge, apparently insular population of Taita White-eyes.

scholarly journals Reconciling Community Livelihood Needs and Biodiversity Conservation in Taita Hills Forests for Improved Livelihoods and Transformational Management of the Landscape

2021 ◽  
pp. 17-35
Author(s):  
Chemuku Wekesa ◽  
Leila Ndalilo ◽  
Carolyne Manya
Keyword(s):  
Biodiversity Conservation ◽  
Management Practices ◽  
Landscape Connectivity ◽  
Local Population ◽  
Wood Products ◽  
Forest Fragments ◽  
Goods And Services ◽  
Taita Hills ◽  
Fragmented Forests ◽  
Integrated Conservation

AbstractThe fragmented forests of Taita Hills form an exceptional multi-functional socio-ecological production landscape with outstanding diversity of flora and fauna that provide ecosystem goods and services supporting human wellbeing and livelihood systems. However, these forests are threatened by illegal logging for wood products and encroachment for crop farming. A study was conducted in villages surrounding five forest fragments to establish the conservation programmes responsible for keeping these forests intact for provision of goods and services to the local communities. Semi-structured questionnaires were used to collect data from 250 respondents in 25 villages surrounding the five forest fragments. Twenty-five focus group discussions (FGDs) were held with key informants actively involved in conservation activities. Results showed that the Taita community conserves the forest fragments through management practices that integrate livelihood needs in conservation, such as butterfly farming, bee-keeping and ecotourism. Additionally, community tree nurseries have been established to produce seedlings for restoring degraded areas, and agroforestry belts have been established on the forests’ edges to provide wood products and protect the forests from encroachment. Likewise, village committees have been established to oversee conservation activities inside the village jurisdictional area. The integrated conservation and livelihood approach has reduced forest destruction, enhanced landscape connectivity for biodiversity conservation, increased incomes, enhanced capacity of the community to adapt to climate change, improved food security, enhanced carbon storage, strengthened traditional knowledge and practices, and ensured availability of clean water for the local population.

scholarly journals The endemic land snail Gulella taitensis of the Taita Hills forests, Kenya: on the brink of extinction

Oryx ◽  
2006 ◽  
Vol 40 (3) ◽  
pp. 362-364 ◽  
Author(s):  
Charles N. Lange
Keyword(s):  
Population Size ◽  
Conservation Status ◽  
Legal Protection ◽  
Land Snail ◽  
Iucn Red List ◽  
Small Population ◽  
Red List ◽  
Forest Fragments ◽  
Forest Reserves ◽  
Taita Hills

This paper describes the distribution, population size and conservation needs of the land snail Gulella taitensis (Gastropoda: Streptaxidae) endemic to the Taita Hills, Kenya. The species was investigated using timed searches between July and December 2000. In total 37 snails were recorded from only five of nine forest fragments searched. The snail was generally more abundant in the smaller forest fragments. The species appears to be a forest specialist, exhibiting preference for the least disturbed sections of forest. The small population size, restricted distribution and concentration in the smallest and most fragile forest fragments suggests the species is on the brink of extinction. The species fulfills the requirements for changing its conservation status from Endangered to Critically Endangered on the IUCN Red List. Promotion of the Forest Reserves to a conservation category that provides greater legal protection is necessary.

scholarly journals Natural History Observations on a Warty Frog: Callulina dawida (Amphibia: Brevicipitidae) in the Taita Hills, Kenya

ISRN Zoology ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Patrick K. Malonza
Keyword(s):  
Natural History ◽  
Cold Season ◽  
Tree Plantations ◽  
Forest Fragments ◽  
Pitfall Trapping ◽  
Taita Hills ◽  
Exotic Tree ◽  
Indigenous Trees ◽  
Indigenous Forest ◽  
Privately Owned

Amphibian populations are declining throughout the world, but most of the susceptible species possess particular biological attributes. Understanding these traits plus the environmental factors responsible for declines greatly aids conservation prioritization and planning. This paper examines the natural history observations and ecological characteristics of Callulina dawida, a frog endemic to the montane forests of the Taita Hills, Kenya. Sampling was accomplished by use of standardized pitfall trapping, transects, and time-limited searches. Mean monthly temperature and elevation significantly influenced the species distribution and abundance but mean monthly rainfall did not. The species was rare or absent during the cold season and its abundance increased with elevation. Breeding occurred during the long dry season (June to October) with juveniles being abundant between January and March. Available evidence shows that this species deposits a cluster of large yolk-rich eggs on the forest floor with maternal care and direct development. Its occurrence only within highly fragmented indigenous forests makes the species worth listing as critically endangered. To conserve this species, all remaining indigenous forest fragments including those communally or privately owned should be preserved and connected through planting of indigenous trees along stream valleys. In addition, the exotic tree plantations should be replaced with indigenous trees to restore the species habitat.

scholarly journals Distribution and conservation of the Javan Hawk-eagle Spizaetus bartelsi

1999 ◽  
Vol 9 (4) ◽  
pp. 333-349 ◽  
Author(s):  
S. (BAS) van Balen ◽  
Vincent Nijman ◽  
Resit Sözer
Keyword(s):  
Habitat Fragmentation ◽  
Population Size ◽  
Bird Species ◽  
Small Population ◽  
Forest Fragments ◽  
Field Surveys ◽  
Illegal Hunting ◽  
Small Population Size

SummaryThe Javan Hawk-eagle Spizaetus bartelsi is endemic to the island of Java. Severe habitat fragmentation and small population size, aggravated by illegal hunting have put this rainforest species on the list of threatened bird species. Intensive searching since 1986 resulted in the discovery of a large number of localities additional to the historic ones. All known locality records of Javan Hawk-eagle have been scrutinized and are listed in the present paper. Confirmed post-1980 records are from 24 forest fragments of varying sizes: 10 (including 28 discrete localities) in west, seven (including 14 discrete localities) in central and seven (including 20 discrete localities) in east Java. The configuration of available habitat in forest clusters is evaluated. The co-existence with other threatened bird taxa, and the need for further field surveys and studies of the Javan Hawk-eagle are discussed.

scholarly journals Decadal persistence of frugivorous birds in tropical forest fragments of northern Paraná

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
Tiago Zaiden ◽  
Fernanda Cristina Marques ◽  
Hugo Reis Medeiros ◽  
Luiz dos Anjos
Keyword(s):  
Bird Species ◽  
The Other ◽  
Forest Fragments ◽  
Forest Fragment ◽  
Frugivorous Birds ◽  
Point Counts ◽  
Bird Populations ◽  
Frugivorous Bird ◽  
Line Transects ◽  
Extinction Events

Forest fragmentation is a major cause of loss of species. We evaluated the local extinction of medium-large frugivorous bird species in six forest fragments of northern Paraná: the Parque Estadual Mata dos Godoy (PEMG), the largest and most preserved forest fragment in the region, and five other fragments. Fixed-width point counts and line transects were conducted along trails in the PEMG for 10 days: from September 2010 to March 2011, and from August 2011 to November 2011. Avian surveys in each of the other forest fragments were made over four days from October to December 2011. We compared data with a previous census carried out 10 years earlier. No extinction events were recorded from the PEMG. However, the relative abundance of species significantly changed during the ten years between surveys. In all the other forest fragments at least two frugivorous bird species disappeared, and in some as many as seven. Protecting the PEMG is crucial for the maintenance of frugivorous bird populations in our studied landscape.

scholarly journals Population densities and conservation status of Norfolk Island forest birds

2012 ◽  
Vol 23 (3) ◽  
pp. 271-282 ◽  
Author(s):  
GUY DUTSON
Keyword(s):  
National Park ◽  
Conservation Status ◽  
Bird Species ◽  
Iucn Red List ◽  
Small Population ◽  
Population Densities ◽  
Point Counts ◽  
Norfolk Island ◽  
Population Sizes ◽  
Line Transects

SummaryThree weeks of intensive surveys in Norfolk Island National Park in 2009 failed to find White-chested White-eye Zosterops albogularis and it was calculated that there was a less than 17% probability that a population of 10 birds had been overlooked. The last multi-observer record of this species was in 1978, and it is recommended that the species’ IUCN Red List status of “Critically Endangered” is tagged as “Possibly Extinct”. During these surveys, the population densities of seven bird species were calculated from 352 independent point counts. Causes of imprecision and bias were investigated, suggesting a small underestimation. Other species were recorded too infrequently, or their distributions were too biased, for analysis. The population densities of the extant endemic taxa were relatively high and suggest no current declines, and the population estimates were consistent with previous studies. This study recommends monitoring most species by point counts, or line transects if resources are limited, supplemented with specific monitoring of Tasman (Norfolk Island) Parakeet Cyanoramphus cookii, Pacific Robin Petroica multicolor, Southern Boobook Ninox novaeseelandiae and seabirds. Ongoing monitoring of these birds is needed to help inform management of the National Park and the island in general, given their small population sizes and their likely susceptibility to rat and cat predation, competition from alien species and drought.

scholarly journals Avian Diversity and Habitat Use of Sultanpur National Park,Haryana, India

2021 ◽  
Vol 10 (1) ◽  
pp. 124-133
Author(s):  
Jagjeet Singh ◽  
◽  
Santosh Hooda ◽  
Annu Phogat ◽  
Vinay Malik ◽  
...  
Keyword(s):  
State Government ◽  
National Park ◽  
Bird Species ◽  
Passerine Bird ◽  
Current Status ◽  
Avian Diversity ◽  
Population Status ◽  
Constant Length ◽  
The Public ◽  
Line Transects

The species diversity, guild and current status of the avifauna in the Sultanpur National Park, Haryana was investigated during January 2018 to June 2019. The line transects method with constant length and variable width was used in the study. The presence of 111 species of birds belonging to 90 genera, 42 families and 17 orders were observed. Non-passerine bird species dominated over the passerine bird species in relative diversity. Data of residential status revealed that 82 species were resident and rest 29 were either winter or summer migrants. Sultanpur National Park supported 41 (36.9%) omnivorous, 29 (26.1%) carnivorous, 24 (21.6%) insectivorous, 9 (8.1%) granivorous, 6 (5.4%) frugivorous and 2 (1.8%) nectarivorous birds. It was further reported that Sultanpur National Park supported 1 endangered, 1 vulnerable and 6 near threatened species of birds. Analysis of population status as per IUCN revealed that 35 species were having stable, 32 decreasing, 25 increasing, 19 had unknown population trend. It is hoped that the study will be helpful in drawing attention, of the public and state government towards conservation of the Sultanpur National Park and, protection of its avian fauna.

scholarly journals Developing indicators for European birds

2005 ◽  
Vol 360 (1454) ◽  
pp. 269-288 ◽  
Author(s):  
Richard D Gregory ◽  
Arco van Strien ◽  
Petr Vorisek ◽  
Adriaan W Gmelig Meyling ◽  
David G Noble ◽  
...  
Keyword(s):  
National Level ◽  
Bird Species ◽  
Population Data ◽  
Biodiversity Loss ◽  
Farmland Birds ◽  
Conservation Action ◽  
Breeding Bird ◽  
Field Methods ◽  
Biodiversity Indicators ◽  
Farmland Bird

The global pledge to deliver ‘a significant reduction in the current rate of biodiversity loss by 2010’ is echoed in a number of regional and national level targets. There is broad consensus, however, that in the absence of conservation action, biodiversity will continue to be lost at a rate unprecedented in the recent era. Remarkably, we lack a basic system to measure progress towards these targets and, in particular, we lack standard measures of biodiversity and procedures to construct and assess summary statistics. Here, we develop a simple classification of biodiversity indicators to assist their development and clarify purpose. We use European birds, as example taxa, to show how robust indicators can be constructed and how they can be interpreted. We have developed statistical methods to calculate supranational, multi-species indices using population data from national annual breeding bird surveys in Europe. Skilled volunteers using standardized field methods undertake data collection where methods and survey designs differ slightly across countries. Survey plots tend to be widely distributed at a national level, covering many bird species and habitats with reasonable representation. National species' indices are calculated using log-linear regression, which allows for plot turnover. Supranational species' indices are constructed by combining the national species' indices weighted by national population sizes of each species. Supranational, multi-species indicators are calculated by averaging the resulting indices. We show that common farmland birds in Europe have declined steeply over the last two decades, whereas woodland birds have not. Evidence elsewhere shows that the main driver of farmland bird declines is increased agricultural intensification. We argue that the farmland bird indicator is a useful surrogate for trends in other elements of biodiversity in this habitat.

scholarly journals Bird communities in three forest types in the Pernambuco Centre of Endemism, Alagoas, Brazil

2013 ◽  
Vol 103 (2) ◽  
pp. 85-96 ◽  
Author(s):  
Lahert W. Lobo-Araújo ◽  
Mário T. F. Toledo ◽  
Márcio A. Efe ◽  
Ana C. M. Malhado ◽  
Marcos V. C. Vital ◽  
...  
Keyword(s):  
Species Richness ◽  
Bird Species ◽  
Bird Communities ◽  
Northeastern Brazil ◽  
Forest Fragments ◽  
Forest Types ◽  
Risk Of Extinction ◽  
Bird Fauna ◽  
Richness Patterns ◽  
Ombrophilous Forest

The Pernambuco Center of Endemism (PCE) in northeastern Brazil is highly fragmented and degraded. Despite its potential conservation importance the bird fauna in this area is still relatively unknown and there are many remnant fragments that have not been systematically surveyed. Here, we report the results of bird surveys in five forest fragments (one pioneer, two ombrophilous and two seasonal). In total, 162 taxa were recorded, 12 of which are endemic to the PCE. The frequency of endangered species was lower than what has been reported in studies from the same area and most of the taxa considered to be at risk of extinction were sub-species of uncertain taxonomic validity. The comparatively low number of endemic/threatened species may be due to the small size of the fragments in the present study - a consequence of the high levels of habitat loss in this region. Analysis of species richness patterns indicates that ombrophilous forest fragments are acting as refuges for those bird species that are most sensitive to environmental degradation.

scholarly journals Tolerance to Human Presence, a Comparison between Rural and Urban Birds in Southeastern Brazil

2021 ◽  
Vol 2 (3) ◽  
pp. 1-4
Author(s):  
Maria Cecília Barbosa de Toledo
Keyword(s):  
Rural Areas ◽  
Urban Areas ◽  
Bird Species ◽  
Urban Environments ◽  
Southeastern Brazil ◽  
Special Focus ◽  
Forest Fragments ◽  
Urban Birds ◽  
Human Presence ◽  
Individual Bird

Green urban areas such as parks, squares, gardens, and forest fragments present a large diversity of uses and conservation objectives. These spaces provide resources for many species of birds that are confronted with the necessity of living in proximity to humans. It is assumed that bird species that acquire resources in urban environments live in a constant state of fear to guarantee survival and reproduction. In this context, the objective of this study was to evaluate the tolerance of birds with respect to human presence in two distinct conditions, rural areas (low level of human presence) and urban areas (high level of human presence). The fieldwork was conducted in a city in the Southeast region of Brazil, and the methodology used the alert distance and flight initiation measurements based on the approach of an observer to the individual bird being focused. Our results suggest that individuals observed in urban areas rely on shorter alert and escape distances, especially males, adults, and birds that forage in interspecific flocks. We discuss the challenges and strategies with respect to escape characteristics of urban birds, with special focus on the economic escape theory. In general, our results support those from studies conducted in other urban areas in different biogeographic regions, and they will aid in comprehending the impacts caused by the increase in urban areas around the world.

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