Articles by Author: Ahmed H Alfarhan

Search results for Ahmed H Alfarhan

We found 40 results for you
  1. Breeding ecology of the Purple Heron <em>Ardea purpurea</em> in Numidia, north-eastern Algeria

    Breeding ecology of the Purple Heron <em>Ardea purpurea</em> in Numidia, north-eastern Algeria

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    During 2002–2007, we assessed the status of the Purple Heron Ardea purpurea in Numidia, Algeria by surveying all the major wetlands in the region. We located six distinct breeding sites; four of these were not previously known. We also investigated...
  2. Phenology, nest-site selection and breeding success of a North African colony of the yellow-legged gull, <em>Larus michahellis</em>

    Phenology, nest-site selection and breeding success of a North African colony of the yellow-legged gull, <em>Larus michahellis</em>

    Item type: Journal Article • Journal: African Zoology
    Gulls are good biological models to investigate anthropogenic changes affecting the environment. We studied the breeding ecology of a monospecific colony of yellow–legged gulls, Larus michahellis on the Algerian island of Srigina, during three consecutive years (2009–2011) and attempted to...
  3. Factors affecting nesting success in the Great-crested Grebe <em>Podiceps cristatus</em> at Lake Tonga, north-east Algeria

    Factors affecting nesting success in the Great-crested Grebe <em>Podiceps cristatus</em> at Lake Tonga, north-east Algeria

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The breeding ecology of the Great-crested Grebe Podiceps cristatus was investigated over four consecutive years (2009-2012) at Lake Tonga, north-east Algeria. In all four years, the egg-laying period was relatively short, spanning two months (end of March to end of...
  4. Nesting ecology of Ferruginous Duck <em>Aythya nyroca</em> in north-eastern Algeria

    Nesting ecology of Ferruginous Duck <em>Aythya nyroca</em> in north-eastern Algeria

    Item type: Journal Article • Journal: African Zoology
    The status of waterbirds breeding in protected areas in North Africa needs constant monitoring because of a naturally fluctuating environment and permissive attitudes towards illegal activities likely to negatively affect population dynamics of threatened species. We present the results of...
  5. Distribution and breeding ecology of the Ferruginous Duck <em>Aythya nyroca</em> in Algeria

    Distribution and breeding ecology of the Ferruginous Duck <em>Aythya nyroca</em> in Algeria

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    We conducted a survey of the distribution of Ferruginous Duck Aythya nyroca across Algeria and analysed the influence of nest-site characteristics on nesting success at a Ramsar site, Lake Tonga. The species was found to occupy different wetlands (freshwater lakes,...
  6. Estimation of thrips (<em>Fulmekiola serrata</em> Kobus) density in sugarcane using leaf-level hyperspectral data

    Estimation of thrips (<em>Fulmekiola serrata</em> Kobus) density in sugarcane using leaf-level hyperspectral data

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The aim of this study was to investigate the potential use of leaf-level hyperspectral data to predict the density of sugarcane thrips Fulmekiola serrata (Kobus). A hand-held spectroradiometer was used to make the spectral measurements on spindle leaves of 4-...
  7. Some properties and expansions associated with the <em>q</em>-digamma function

    Some properties and expansions associated with the <em>q</em>-digamma function

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    This paper is devoted to derive some properties and expansions associated with the q-digamma function. The Newton series which is consisting of terms of forward difference operator, is established for the q-digamma function. The maltiplication formula of the q-gamma function...
  8. Knowledge, attitudes and perceptions of HIV/AIDS among traditional birth attendants and herbal practitioners in Lagos State, Nigeria

    Knowledge, attitudes and perceptions of HIV/AIDS among traditional birth attendants and herbal practitioners in Lagos State, Nigeria

    Item type: Journal Article • Journal: African Journal of AIDS Research
    Recognising the widespread role of traditional birth attendants (TBAs) and herbal practitioners (HPs) in health care at community level in Nigeria, we set out to assess their knowledge, attitudes and practices in relation to HIV infection and prevention. Questionnaires were...
  9. Why HIV/AIDS should be treated as exceptional: arguments from sub-Saharan Africa and Eastern Europe

    Why HIV/AIDS should be treated as exceptional: arguments from sub-Saharan Africa and Eastern Europe

    Item type: Journal Article • Journal: African Journal of AIDS Research
    The idea that HIV and AIDS gets too much attention and funding emerged in 2008 with a call to end 'AIDS exceptionalism.' This article outlines a short history of AIDS exceptionalism — the idea that HIV and AIDS require a...
  10. Distribution, breeding phenology and time budget of Ruddy Shelduck <em>Tadorna ferruginea</em> during the annual cycle in the Hauts Plateaux, north-east Algeria

    Distribution, breeding phenology and time budget of Ruddy Shelduck <em>Tadorna ferruginea</em> during the annual cycle in the Hauts Plateaux, north-east Algeria

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Between September 2003 and July 2006, the reproductive biology and time budget of the Ruddy Shelduck Tadorna ferruginea was studied in the wetland complex of Oum el Bouaghi, north-east Algeria. Our results indicate a marked post-breeding dispersal of the Ruddy...