scholarly journals Assembly of Optimum Habitats for Asian Houbara Bustard (Chlamydotis macqueenii) in the Arabian Peninsula: The Vegetation Aspects

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Naseraldeen Baqer Asadalla ◽  
Mohammad Sulaiman Abido ◽  
Asma Abahussain ◽  
Mohamed Shobrak
Keyword(s):  
Arabian Peninsula ◽  
Species Abundance ◽  
Acacia Tortilis ◽  
Biotic Factors ◽  
Factors Affecting ◽  
Houbara Bustard ◽  
Abiotic And Biotic Factors ◽  
Study Sites ◽  
And Behavior ◽  
Line Intercept

This research was conducted in four sites at Mahazat as-Sayd reserve in Saudi Arabia to determine the optimum habitats’ constituents for Asian houbara bustard Chlamydotis macqueenii via assessing abiotic and biotic factors with special reference to vegetation aspects. Vegetative parameters were quantified using combinations of distance and line intercept methods. Acquired data were analyzed using cluster analysis and analysis of variance tests. Results indicated that three of the four plant communities of the study sites were dominated by Acacia tortilis with underground cover composed of lesser species. On the other hand, White Jabal was dominated by scrubs composed mainly of Fagonia indica with sparse Acacia trees. Rumrumiyya site recorded the highest species abundance and vegetative coverage (133%) among the sites. It is concluded that Black Jabal and White Jabal sites are used as nesting and foraging habitats for houbaras, whereas Jabal Khurse is specifically a males’ display site. Nevertheless, Rumrumiyya site was used for foraging and shelter. The study confirmed that density and vegetation cover are of prime importance for houbara site selection. However, other factors affecting feeding and behavior of the species must be considered in further studies.

Abiotic and biotic factors affecting crop seed germination and seedling emergence: a conceptual framework

2018 ◽  
Vol 432 (1-2) ◽  
pp. 1-28 ◽  
Author(s):  
Jay Ram Lamichhane ◽  
Philippe Debaeke ◽  
Christian Steinberg ◽  
Ming Pei You ◽  
Martin J. Barbetti ◽  
...  
Keyword(s):  
Seed Germination ◽  
Conceptual Framework ◽  
Seedling Emergence ◽  
Biotic Factors ◽  
Factors Affecting ◽  
Abiotic And Biotic Factors ◽  
Crop Seed

scholarly journals Dingoes dining with death

2021 ◽  
Author(s):  
Emma Spencer ◽  
Thomas Newsome
Keyword(s):  
Biotic Factors ◽  
Functional Roles ◽  
Remote Cameras ◽  
Animal Remains ◽  
Closed Canopy ◽  
Carcass Persistence ◽  
Abiotic And Biotic Factors ◽  
Study Sites ◽  
Almost All

ABSTRACT Dingoes (Canis dingo) are known for hunting and killing animals to meet their energetic requirements, but like almost all predators they also scavenge animal remains. To improve our understanding of dingo scavenging ecology, we investigated the role of abiotic and biotic factors in shaping carcass utilisation by dingoes and further determined whether dingo scavenging influenced carcass persistence in the landscape. To do so, we monitored visitation and scavenging by dingoes using remote cameras positioned on 119 kangaroo carcasses in open and closed canopy habitats and in warm and cool seasons. The carcasses were monitored across multiple study sites, which incorporated forest, alpine and desert ecoregions in Australia. We found that season played an important role in shaping carcass utilisation by dingoes, as well as carcass persistence. Warmer seasons increased the rate of carcass discovery 6.3-fold in the Forest study site and 4.8-fold in the Alpine study site, and also increased the time dingoes spent feeding on carcasses in the Alpine study site. Further, across all study sites, carcasses persisted at least 4.7 times longer in cool compared with warm seasons. On the other hand, carcass utilisation by dingoes was not influenced by habitat, although carcasses were more likely to persist in open compared with closed canopy habitats in the Alpine study site. Finally, our study showed that dingo scavenging may contribute to substantial carcass removal in certain contexts. Indeed, decreased carcass persistence in the Forest study site was evident in the cool season, when dingo scavenging occurred during the first two weeks of monitoring. The variability in results highlights the complexity of patterns in dingo scavenging and, more broadly, of vertebrate scavenging. It emphasises the need to consider multiple abiotic and biotic factors to properly understand the functional roles of different scavenger species. Longer-term studies with additional seasonal replicates may also yield a more detailed picture of the role of dingoes as apex scavengers.

Abiotic and Biotic Factors Affecting the Ingestion Rates of Mixotrophic Nanoflagellates (Haptophyta)

2018 ◽  
Vol 77 (3) ◽  
pp. 607-615 ◽  
Author(s):  
Ya-Fan Chan ◽  
Kuo-Ping Chiang ◽  
Yun Ku ◽  
Gwo-Ching Gong
Keyword(s):  
Biotic Factors ◽  
Ingestion Rates ◽  
Factors Affecting ◽  
Abiotic And Biotic Factors

scholarly journals Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite PathogenNeozygites floridana

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Vanessa da Silveira Duarte ◽  
Karin Westrum ◽  
Ana Elizabete Lopes Ribeiro ◽  
Manoel Guedes Corrêa Gondim Junior ◽  
Ingeborg Klingen ◽  
...  
Keyword(s):  
Pathogenic Fungus ◽  
Field Studies ◽  
Spore Formation ◽  
Biotic Factors ◽  
Tetranychus Evansi ◽  
Tropical Regions ◽  
Factors Affecting ◽  
Resting Spore ◽  
Resting Spores ◽  
Abiotic And Biotic Factors

Neozygites floridanais an obligate mite pathogenic fungus in the Entomophthoromycota. It has been suggested that resting spores of this fungus are produced as a strategy to survive adverse conditions. In the present study, possible mechanisms involved in the regulation of resting spore formation were investigated in the hostsTetranychus urticaeandTetranychus evansi. Abiotic and biotic factors mimicking conditions that we, based on earlier field studies, thought might induce resting spores in temperate and tropical regions were tested with isolates from Norway and Brazil. A total of 42 combinations of conditions were tested, but only one induced the formation of a high number of resting spores in only one isolate. The Brazilian isolate ESALQ1420 produced a large number of resting spores (51.5%) inT. urticaeat a temperature of 11°C, photoperiod of 10L:14D, and light intensity of 42–46 (μmol m−2 s−1) on nonsenescent plants (nondiapausing females). Resting spores of the BrazilianN. floridanaisolate ESALQ1421 were found at very low levels (up to 1.0%). Small percentages ofT. urticaewith resting spores (0–5.0%) were found for the Norwegian isolate NCRI271/04 under the conditions tested. The percentages of resting spores found for the Norwegian isolate in our laboratory studies are similar to the prevalence reported in earlier field studies.

scholarly journals Abiotic and biotic factors affecting the replication and pathogenicity of bee viruses

2016 ◽  
Vol 16 ◽  
pp. 14-21 ◽  
Author(s):  
Alexander J McMenamin ◽  
Laura M Brutscher ◽  
William Glenny ◽  
Michelle L Flenniken
Keyword(s):  
Biotic Factors ◽  
Factors Affecting ◽  
Abiotic And Biotic Factors ◽  
Bee Viruses

Surrounding Vegetation, Climatic Elements, and Predators Affect the Spatial Dynamics of Bemisia tabaci (Hemiptera: Aleyrodidae) in Commercial Melon Fields

2019 ◽  
Vol 112 (6) ◽  
pp. 2774-2781 ◽  
Author(s):  
Thiago Nunes Pinto Felicio ◽  
Thiago Leandro Costa ◽  
Renato Almeida Sarmento ◽  
Rodrigo Soares Ramos ◽  
Poliana Silvestre Pereira ◽  
...  
Keyword(s):  
Bemisia Tabaci ◽  
Natural Enemies ◽  
Density Ratio ◽  
Spatial Dynamics ◽  
Sampling Location ◽  
Biotic Factors ◽  
Factors Affecting ◽  
Abiotic And Biotic Factors ◽  
Pest Density ◽  
Climatic Elements

Abstract Studying the spatial dynamics of pests allows the determination of abiotic and biotic factors affecting time and locations of pest attack to the crops. Such abiotic and biotic factors mainly include 1) climatic elements, 2) natural enemies, 3) phenological stage of plants, and 4) surrounding vegetation. Melon (Cucumis melo L. [Cucurbitales: Cucurbitaceae]) is among the most consumed fruit in the world, and the whitefly Bemisia tabaci (Gennadius) is among the main pests of this crop. This work aimed to determine the effects of surrounding vegetation, natural enemies, climatic elements, and stages of plants on the spatial dynamics of B. tabaci in commercial melon fields. Adult whitefly densities were monitored on four melon fields in a tropical climate region. Sampling location in crops was georeferenced. Experimental data were submitted to geostatistical analysis. The highest densities of B. tabaci occurred during hot periods experiencing lower rainfall, and when the surrounding area presented crops hosting B. tabaci, especially other melon farms. The density ratio of the predators (i.e., spiders and Geocoris sp.) were dependent on pest density. The pattern of field colonization by B. tabaci varies according to its density. Therefore, the surrounding vegetation, air temperature, and predators influence the spatial distribution of B. tabaci in melon fields. These results provide important information to melon farmers, assisting them to improve the management of B. tabaci in the field.

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