Yahkat Barshep

Yahkat Barshep
A. P. Leventis Ornithological Research Institute · Department of Zoology

PhD
1. Moult in birds 2. Avian response to changing earth systems 2. Emerging and re-emerging infectious diseases

About

26
Publications
7,226
Reads
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213
Citations
Additional affiliations
November 2016 - present
A. P. Leventis Ornithological Research Institute
Position
  • Senior Researcher
Education
May 2007 - December 2011
University of Cape Town
Field of study
  • Statistical Ecology
September 2006 - April 2007
Lund University
Field of study
  • Theoretical Ecology

Publications

Publications (26)
Article
Full-text available
Molt is a major component of the annual cycle of birds, the timing and extent of which can affect body condition, survival, and future reproductive success through carry-over effects. The way in which molt is fitted into the annual cycle seems to be a somewhat neglected area which is both of interest and of importance. Study of the causes of annual...
Conference Paper
Full-text available
There are many different protocols available for monitoring butterflies in the field but none of them can uniformly be considered as the best because every field protocol has its own set of advantages and disadvantages in terms of effectiveness and cost-efficiency, and these may differ with environment and the group of butterflies being surveyed. I...
Article
Full-text available
This study presents data on woody plant species richness and diversity of an inaccessible dry forest of Tula Mountains Woodland (TMW) located in the northeast of Nigeria. TMW supports a minimally disturbed mosaic of dry forest‐woodland. We sampled woody species in 190 plots of size 0.01‐ha, spaced 50 m apart on series of line transects. We found a...
Article
Full-text available
The Bergmann’s rule predicts that in endotherms, body sizes will differ with respect to thermal gradients. Larger bodied individuals will inhabit colder environments while in warmer environments, individuals will be smaller-bodied. This hypothesis has been proved and disproved many times due to inconsistencies in body size differences along latitud...
Article
The Convention of Migratory Species aims to protect migratory animals throughout their range, but efficient mitigation of threats facing migratory birds is hindered by poor knowledge about the magnitude and geographic range of threats. We used an expert assessment to prioritise which threats to mitigate in 13 countries along the eastern Mediterrane...
Article
Full-text available
The measurement of stable hydrogen isotope ratios (δ2H) in animal tissues is a popular means of inferring spatial origins and migratory connections. However, the use of this isotope to infer diet and potentially trophic position remains poorly understood, especially in non-aquatic terrestrial ecosystems. In many animal communities, tissue δ15N valu...
Article
Short note: Acoustic record and nesting attempts of the Ibadan Malimbe (Malimbus ibadanensis) in Emerald Forest Reserve, southwest Nigeria
Preprint
Millions of large soaring birds migrate from the Palaearctic to Africa every year, and follow distinct flyways around the Mediterranean Sea. While there is conservation concern for many long-distance migratory bird populations, the magnitude and geographic range of threats affecting birds along flyways are poorly known, which complicates efficient...
Article
Full-text available
Background: Plasma HIV-RNA viral load (VL) of HIV-infected persons is an important prognostic factor in HIV management. We determined the VL among antiretroviral therapy (ART)-naive patients to identify the association between patients' demographic, clinical and laboratory characteristics with VL. Method: A cross-sectional study of 224 ART-naive HI...
Article
Trade‐offs between moult and fuelling in migrant birds vary with migration distance and the environmental conditions they encounter. We compared wing moult and fuelling at the northern and southern ends of migration in two populations of adult Common Whitethroats Sylvia communis. The western population moults most remiges at the breeding grounds in...
Article
Full-text available
Background: Malaria is a serious disease and still remains a public health problem in many parts of Nigeria. Objectives: The aim of this study was to describe malaria transmission trends and analyzed the impact of climatic factors on malaria transmission in the highlands of Plateau State, Central Nigeria. Methods: The study was a retrospective surv...
Article
Full-text available
Identifying species most vulnerable to environmental change requires reliable estimates of population trends and identification of traits that tend to be associated with these trends. Using state-space models that explicitly describe how the population size changes over time, we estimated population trends of 25 non-migratory African, 13 intra-Afri...
Article
Full-text available
Malaria is a major public health problem in the remote areas of lower Plateau state. This study described malaria transmission patterns and analysed the impact of meteorological variables on the disease transmission in the study area. The study was a retrospective study, which involved the use of archival data relating to rainfall, temperature, rel...
Article
Full-text available
Background Plasma HIV-RNA viral load (VL) of HIV-infected persons is an important prognostic factor in HIV management. We determined the VL among antiretroviral therapy (ART)-naive patients to identify the association between patients’ demographic, clinical and laboratory characteristics with VL. Method A cross-sectional study of 224 ART-naive HIV...
Article
Full-text available
Occurrence of animals in an area and the size of territories they occupy is a function of resource availability and the environmental conditions in that area. Territory location in birds is often determined by availability of nesting habitat and we investigate whether this is the case for the little-studied Northern Anteater-chat Myrmecocichla aeth...
Article
Full-text available
The breeding phenology and moult cycle of the vulnerable and range-restricted Bannerman's Weaver Ploceus bannermani was studied on the Obudu Plateau in the eastern region of Nigeria. The peak breeding season was between August and October; a major cause of breeding failure was egg predation by children. The estimated start date of moult for the ave...
Article
Full-text available
Zoonoses pose a risk to public health. To carry out the investigation of the prevalence of gastrointestinal parasites of baboons, Papio anubis, frequenting the Wikki base Camp in Yankari National Park, Nigeria. Formol-ether concentration technique was used to isolate parasite eggs and cysts from faecal samples. Parasites recovered were Ascaris lumb...
Article
Full-text available
We investigated the adaptations of primary moult to conditions on the nonbreeding areas in the Curlew Sandpiper Calidris ferruginea, an Arctic breeding, long-distance migratory wader (shorebird). Parameters of moult (start date, duration, and standard deviation) and how they are affected by rainfall patterns were estimated using and extension of th...
Article
Full-text available
Recent shifts in the timing of migration and breeding have been attributed to climate vari-ation in some migratory birds. However, the divergent patterns in the timing of autumn migration among different bird species suggest a significant role of factors other than cli-mate. Using data of constant-effort catches, determinants for the annual variati...
Article
Full-text available
This study on the non-breeding ecology of the Whinchat Saxicola rubetra was conducted in central Nigeria from February through April. The core site was at Gwafan (N09°53', E08°57'), an open scrubland located 10 km east of the city of Jos. The density of Whinchats at Gwafan was 0.58 individuals/ ha, almost three times the overall density around Jos....
Article
Full-text available
The population moult parameters, yearly onset of moult and sex-specific schedule of moult in relation to breeding success, and pattern of feather mass growth were examined in a population of Curlew Sandpipers Calidris ferruginea that migrate to northwest Australia. The mean start date of moult was 18 September, and it lasted on average 129 days. No...
Article
Full-text available
Using constant-effort catch data, causes of annual variation in the timing of migration of Curlew Sandpipers (Calidris ferruginea) migrating through Ottenby, Sweden, as well as the trend in timing of migration from 1946-2005, was investigated. Variation in the timing of autumn migration of adult and juvenile Curlew Sandpipers was influenced by bree...
Article
Full-text available
The Garden Warbler breeds in the Palaearctic and migrates to sub-Saharan Africa for the non-breeding season. We studied its passage, body mass and moult at the Obudu Plateau in southeast Nigeria in October-December 2005 and December 2007-January 2008. In Nigeria. Garden Warblers in the Guinea savanna have been shown to increase body mass in October...

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