LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 5 of total 5

Search options

  1. Article: Hyper-arid tall shrub species have differing long-term responses to browsing management

    Gallacher, David J / Khafaga, Tamer

    Arid land research and management. 2020 Jan. 2, v. 34, no. 1

    2020  

    Abstract: Hyper-arid rangeland vegetation is typically dominated by large woody species which are often overlooked in herbivory studies. Long-term responses of tall shrub populations to herbivory change are poorly understood in the Arabian Peninsula. Population ... ...

    Abstract Hyper-arid rangeland vegetation is typically dominated by large woody species which are often overlooked in herbivory studies. Long-term responses of tall shrub populations to herbivory change are poorly understood in the Arabian Peninsula. Population and size of 1559 individuals from four shrub species were assessed over an 11-year period under two herbivory regimes, one in which domestic livestock (camels) were replaced by semi-wild ungulates (Oryx and gazelles) before, and the other during, the study period. Each shrub species exhibited a different response to the change in herbivory. Populations of Calotropis procera decreased dramatically. Populations of both Calligonum polygonoides and Lycium shawii increased through sexual reproduction, but the spatial distribution of recruits indicated different modes of seed dispersal. Average lifespans were estimated at 22 and 20 years respectively. The persistence strategy of Leptadenia pyrotechnica was similar to tree species of this habitat in that vegetative regrowth was prioritized over recruitment, and average lifespan was estimated at 95 years. Shrub responses to changes in ungulate management are therefore species-specific. The response of individual plant size was faster than the response of population size, which was limited by slow sexual recruitment (L. pyrotechnica) or localized seed dispersal (C. polygonoides).
    Keywords browsing ; Calligonum ; Calotropis procera ; camels ; gazelles ; habitats ; herbivores ; Leptadenia ; longevity ; Lycium shawii ; Oryx ; population size ; rangelands ; regrowth ; seed dispersal ; sexual reproduction ; shrubs ; trees ; vegetation ; woody plants ; West Asia
    Language English
    Dates of publication 2020-0102
    Size p. 99-116.
    Publishing place Taylor & Francis
    Document type Article
    ZDB-ID 1490766-5
    ISSN 1532-4990 ; 1532-4982
    ISSN (online) 1532-4990
    ISSN 1532-4982
    DOI 10.1080/15324982.2019.1605631
    Database NAL-Catalogue (AGRICOLA)

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Article: Zoometric data extraction from drone imagery: the Arabian oryx (Oryx leucoryx)

    de Kock, Meyer E / O’Donovan, Declan / Khafaga, Tamer / Hejcmanová, Pavla

    Environmental conservation. 2021 Dec., v. 48, no. 4

    2021  

    Abstract: Data extraction from unmanned aerial vehicle (UAV) imagery has proved effective in animal surveys and monitoring, but to date has scarcely been used for detailed population analysis and individual animal feature extraction. We assessed the zoometric and ... ...

    Abstract Data extraction from unmanned aerial vehicle (UAV) imagery has proved effective in animal surveys and monitoring, but to date has scarcely been used for detailed population analysis and individual animal feature extraction. We assessed the zoometric and feature extraction of the Arabian oryx (Oryx leucoryx) using data acquired from a captive population for comparison with reintroduced populations monitored by UAVs. Highly accurate scaled and geo-rectified imagery derived from UAV surveys allowed precise morphometric measurements of the oryx. The scaled top-view imagery combined with baseline data from known sex, age, weight and pregnancy status of captive individuals were used to develop predictive models. A bracketed index developed from the predictive models showed high accuracy for classifying the age group ≤16 months, animals with a weight >80 kg and pregnancy. The pregnancy classification decision tree model performed with 91.7% accuracy. The polynomial weight predictive model performed well with relatively high accuracy when using the total top-view surface measurement. Photogrammetrically processed UAV-acquired imagery can yield valuable zoometric data, feature extraction and modelling; it is a tool with a practical application for field biologists that can assist in the decision-making process for species conservation management.
    Keywords Oryx leucoryx ; animals ; decision making ; decision support systems ; models ; morphometry ; natural resources conservation ; pregnancy ; unmanned aerial vehicles
    Language English
    Dates of publication 2021-12
    Size p. 295-300.
    Publishing place Cambridge University Press
    Document type Article
    ZDB-ID 1470226-5
    ISSN 1469-4387 ; 0376-8929
    ISSN (online) 1469-4387
    ISSN 0376-8929
    DOI 10.1017/S0376892921000242
    Database NAL-Catalogue (AGRICOLA)

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  3. Article ; Online: Potentially Zoonotic Viruses in Wild Rodents, United Arab Emirates, 2019-A Pilot Study.

    Weidinger, Pia / Kolodziejek, Jolanta / Khafaga, Tamer / Loney, Tom / Howarth, Brigitte / Sher Shah, Moayyed / Abou Tayoun, Ahmad / Alsheikh-Ali, Alawi / Camp, Jeremy V / Nowotny, Norbert

    Viruses

    2023  Volume 15, Issue 3

    Abstract: The majority of emerging viral infectious diseases in humans originate from wildlife reservoirs, such as rodents and bats. We investigated a possible reservoir, namely wild gerbils and mice trapped in a desert reserve within the emirate of Dubai, United ... ...

    Abstract The majority of emerging viral infectious diseases in humans originate from wildlife reservoirs, such as rodents and bats. We investigated a possible reservoir, namely wild gerbils and mice trapped in a desert reserve within the emirate of Dubai, United Arab Emirates (UAE). In total, 52 gerbils and 1 jird (Gerbillinae), 10 house mice (
    MeSH term(s) Humans ; Animals ; Mice ; Pilot Projects ; United Arab Emirates/epidemiology ; Phylogeny ; Gerbillinae ; Middle East Respiratory Syndrome Coronavirus ; Hemorrhagic Fever Virus, Crimean-Congo ; Hemorrhagic Fever, Crimean
    Language English
    Publishing date 2023-03-07
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v15030695
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article ; Online: MERS-CoV Found in

    Weidinger, Pia / Kolodziejek, Jolanta / Loney, Tom / Kannan, Dafalla O / Osman, Babiker Mohammed / Khafaga, Tamer / Howarth, Brigitte / Sher Shah, Moayyed / Mazrooei, Hessa / Wolf, Nadine / Karuvantevida, Noushad / Abou Tayoun, Ahmad / Alsheikh-Ali, Alawi / Camp, Jeremy V / Nowotny, Norbert

    Viruses

    2023  Volume 15, Issue 6

    Abstract: The main mode of transmission of Middle East respiratory syndrome-related coronavirus (MERS-CoV) between dromedaries is likely via the respiratory route. However, there must be other modes to explain how the infection is brought to MERS-CoV-negative ... ...

    Abstract The main mode of transmission of Middle East respiratory syndrome-related coronavirus (MERS-CoV) between dromedaries is likely via the respiratory route. However, there must be other modes to explain how the infection is brought to MERS-CoV-negative closed herds, such as transmission by ticks. Here, we present a study performed at three different locations in the United Arab Emirates (UAE) involving 215 dromedary camels (
    MeSH term(s) Animals ; Middle East Respiratory Syndrome Coronavirus/genetics ; Camelus ; Livestock ; Coronavirus Infections/epidemiology ; Coronavirus Infections/veterinary ; Ticks ; United Arab Emirates/epidemiology ; Ixodidae ; RNA
    Chemical Substances RNA (63231-63-0)
    Language English
    Publishing date 2023-05-30
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v15061288
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  5. Article ; Online: Crimean-Congo Hemorrhagic Fever Virus Endemicity in United Arab Emirates, 2019.

    Camp, Jeremy V / Kannan, Dafalla O / Osman, Babiker Mohammed / Shah, Moayyed Sher / Howarth, Brigitte / Khafaga, Tamer / Weidinger, Pia / Karuvantevida, Noushad / Kolodziejek, Jolanta / Mazrooei, Hessa / Wolf, Nadine / Loney, Tom / Nowotny, Norbert

    Emerging infectious diseases

    2020  Volume 26, Issue 5, Page(s) 1019–1021

    Abstract: We conducted a cross-sectional survey of Crimean-Congo hemorrhagic fever virus (CCHFV) in dromedary camels and attached ticks at 3 locations in the United Arab Emirates. Results revealed a high prevalence of CCHFV-reactive antibodies in camels and viral ... ...

    Abstract We conducted a cross-sectional survey of Crimean-Congo hemorrhagic fever virus (CCHFV) in dromedary camels and attached ticks at 3 locations in the United Arab Emirates. Results revealed a high prevalence of CCHFV-reactive antibodies in camels and viral RNA in ticks and camel serum, suggesting the virus is endemic in this country.
    MeSH term(s) Animals ; Cross-Sectional Studies ; Hemorrhagic Fever Virus, Crimean-Congo ; Hemorrhagic Fever, Crimean/epidemiology ; Ticks ; United Arab Emirates/epidemiology
    Language English
    Publishing date 2020-05-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1380686-5
    ISSN 1080-6059 ; 1080-6040
    ISSN (online) 1080-6059
    ISSN 1080-6040
    DOI 10.3201/eid2605.191414
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Zs.A 4778: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

To top