Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Pioneer species"”.
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Seed Banks, Seed Mortality, and the Role of Fungal Communities in Neotropical Forests
… fungi; tropical forest ecology; seed bank; pioneer species; pathogens; ITS; Barro Colorado Island, Panama; La Selva, Costa Rica; Yasuni, Ecuador; recruitment limitation.
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Reproductive traits of pioneer gastropod species colonizing deep-sea hydrothermal vents after an eruption
The colonization dynamics and life histories of pioneer species are vital components in understanding the early succession of nascent hydrothermal vents. The reproductive ecology of pioneer species at deep-sea hydrothermal vents may provide insight into their dispersal, population connectivity, and …
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Light microsite requirements of seedlings of some Afromontane forest tree species: the role of canopy gaps promoting regeneration
… for seven common Afromontane forest tree species were made by testing above ground relative growth rate (RGR) and photosynthetic response of seedlings of the respective species under different light intensities. Virgilia oroboides and Halleria lucida, with either a very high photosynthetic …
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Reproductive traits of pioneer gastropod species colonizing deep-see hydrothermal vents after an eruption
The colonization dynamics and life histories of pioneer species are vital components in understanding the early succession of nascent hydrothermal vents. The reproductive ecology of pioneer species at deep-sea hydrothermal vents may provide insight into their dispersal, population connectivity, and …
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Ice storms as a disturbance factor in Appalachian oak forests
… view, succession is said to be accelerated as pioneer species sustain greater damage than equilibrium species. The resistant equilibrium species would then fill canopy gaps, shifting the stand to a more advanced stage. Alternatively, extensive canopy damage allows more light to reach the forest …
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ΣΥΝΘΗΚΕΣ ΤΗΣ ΦΥΣΙΚΗΣ ΕΓΚΑΤΑΣΤΑΣΗΣ ΤΗΣ ΔΑΣΙΚΗΣ ΠΕΥΚΗΣ ΣΕ ΠΕΡΙΟΧΗ ΤΗΣ ΡΟΔΟΠΗΣ
… WERE MISSING AND A RAPID SUCCESSION BEGAN. THE PIONEER SPECIES THAT ESTABLISHED THE FIRST STANDS, WAS THE SCOTCH PINE (PINUS SYLVESTRIS L.) AND LATER ON OTHER SPECIES. WAYS FOR MORE ECONOMICAL STANDESTABLISHMENT AND SILVICULTURAL MEASURES FOR THE EXISTING STANDS, IN ORDER TO BE MORE PRODUCTIVE, …
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Linking mechanism to pattern in community assembly: Ant-mediated seed dispersal in neotropical pioneer tree species
… to describe the movement of seeds of Neotropical pioneer tree species that are not known to have elaiosomes by ants. For my research, I chose Neotropical pioneer tree species that are commonly found in the soil seed bank of Barro Colorado Island (BCI), Panama. The seeds of these tree species do …
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Native forest tree conservation in tropical agroforests: Case study of cacao farms in the Atlantic Forest of southern Bahia, Brazil
… native timber. I found that a number of native pioneer species are regenerating at relatively high frequencies and abundances. I also found that many secondary native forest tree species are also regenerating although their sapling are found less frequently and at lower abundances. Most primary …
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Tree functional diversity affects litter decomposition and arthropod community composition in a tropical forest
… and forest recovery from disturbance alters species- and functional diversity, which in turn can modify decomposition processes and affect ecosystem carbon and nutrient cycling. Despite numerous studies on tropical litter decomposition, the links among plant- and invertebrate diversity and …
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Restoring the Chocó: Growth and Survival of Native Chocoan Trees Using Different Propagation Methods
… data on the survival and growth rates of native species can contribute to the design of effective ecological restoration strategies in the region. With this objective, we evaluated the establishment capacity of 28 native species propagated from large cuttings. The results showed that survival …
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Nutrient fluxes and soil microbial processes
… specific information on the impact of tree species on nutrient cycling, soil properties and microbial activities. In this study, six broadleaved species were growing at the same site with similar condition in terms of soil type, land use history and climate. Thus, the potential effects on …
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Character displacement in Burkholderia biofilm communities and the effect of adaptive history on the evolution of niche breadth
… in many habitats, which would make them good pioneer species for colonization. We investigated the role of character displacement and facilitation in maintaining diversity in a synergistic, biofilm-adapted population of Burkholderia cenocepacia, an opportunistic pathogen of cystic fibrosis …
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Impacts of Laurel Wilt Disease on Redbay (Persea Borbonia) Population Structure and Forest Communities in the Coastal Plain of Georgia, USA
… when dead stems were included. Two co-dominant species to redbay, sweetbay (Magnolia virginiana) and loblolly bay (Gordonia lasianthus), ranked 1st and 2nd in mean IV at infested sites but 2nd and 3rd in mean IV at control sites and may be increasing in importance. Increases in herbaceous …
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Ecological significance of seed traits in the genus Macaranga
… and pathogens. In this study ten Macaranga species (Euphorbiaceae) varying in seed mass and adult crown illumination were used as a study system to test hypotheses linking seed mass to light and soil moisture requirements for germination, investment in seed chemical and physical defense, and …
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The Ecology of Invase tree species in Singapore
Invasive species have been recognized as one of the main threats to biodiversity. Invasive trees, however, are relatively understudied compared to other taxa, especially in Tropical East Asia. This study was conducted on invasive trees in Singapore: an ideal study site for tree invasions in …
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Firestorms in a mesic savanna-forest mosaic
… of forest margins as the seed bank of these pioneer species is depleted over time. In the future, chance fires which are not suppressed will lead to larger losses of forest area as shade intolerant pioneer species are not readily available to reclaim forest edges. There are clear differences …
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Dynamics in Discrete Time: Successional Communities, Spatial Models, and Allee Effects
… predictions can aid decision-making regarding species conservation, habitat design, biological control, and other matters related to ecosystem management. In this dissertation, I build and analyze several discrete-time population models, including developing a method for analyzing the spatial …
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Investigation on Revegetation/ Phytoremediation of Campo Pisano abandoned mine area
… selected due to its special characteristics as a pioneer species growing spontaneously on Campo Pisano (CP) mine tailing, a multiple heavy metal contamination site in SW-Sardinia, Italy. The aim of this PhD thesis is to assess the phytoremediation capability of P. halepensis and focuses on …
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Discreet dynamical population models : higher dimensional pioneer-climax models
… dissertation, the basic elements of the model - pioneer and climax species - are described and discussed from an ecological as well as a dynamical systems perspective. An attempt is made to explain why the chosen hierarchical form of the model to explain why the chosen hierarchical form of the …
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