This paper was written by Duane Peltzer of Landcare research in New Zealand. The paper is about experiments conducted to test the responses of plants to different soil origins and different types of competition then that which is normal for the plant. It focuses on the grass species of Bouteloua and the shrub species of Elaeagnus. The research conducted for this study found that competitive responses may be affected by factors such as soil type and in turn that plants affect the resources in their soils and in their soil community. In the studies researched not many studies viewed these effects as feedbacks and that both positive and negative feedbacks drive species level replacement. It was also found that soil communities are dominated by fungi in the forest and bacteria in the prairie. From this information Peltzer chose to study weather grassy and woody plants respond differently to competition in the prairie and forest, whether the outcome of competition is dependent on soil origin and whether plant-soil feedbacks occur between prairie and forest. He hypothesized that if there ...
Reproduction and passing on genetic and behavioral traits to an offspring is a common fundamental to all the species on this planet. When studying forest ecology, it is crucial to study the proportion of individuals surviving at each stage of their growth as the lives and mortality experienced in a species population describes a characteristic of the species in question. In the case of American beech and sugar maple, their attempt to produce seeds is analogous to entering lottery, where every seedling has a potential chance of becoming a canopy but only some will survive and reach the canopy size; thus, becoming the fit ‘winners’. Our information shows that together, based on size class distribution, both the species display a ‘winner takes all’ pattern, which supports our hypothesis. The results showed a greater count for seedlings and short saplings than for tall saplings, sub-canopies and canopies. This is evident for a Type III survivorship curve. In Type III curve all individuals initially having a very low chance of survival. However, once the individuals pass their threshold age and survive, they live an advanced age. Only some individuals out the mast seeding production mature to become fully fit canopy trees. On the other hand, our hypothesis of canopy trees representing the bulk of the biomass was supported as the basal areas decreased going from growth stages of canopy to seedlings. This is evidence that once the individuals survive the bottleneck where there is high mortality of young individuals (seedlings), who are then considered as ‘losers’, will allow for the other larger size class individuals to flourish. Here, having considerable amount of dbh (diameter at breast height) accounts for greater surfac...
Many variations and species of plants can be found all around the world and in different habitats. These variations and characteristics are due to their adaptations to the natural habitat surrounding them. In three of many climatic zones, the arid, tropical and temperate zone, plants that vary greatly from each other are found in these locations. In this experiment, we’ll be observing the connection between the adaptations of the plants to their environment at the Fullerton Arboretum. The arboretum is a space containing numerous plants from different environments. The plants are carefully looked after and organized into their specific habitat. Therefore, we’ll be able to take a look at the plants within multiple
A population of Plantago lanceolata (ribwort plantain) on the path was found to have higher trampling tolerance than populations away from the path; this reflected the sharp differences in the conditions of the plant at these sites. Ribwort Plant had generally a higher tolerance to trampling than any other plants as more were found on the path, but there were less compared with other plants as distance increased from the path. These results suggest that the competition level found on the path was sufficient enough to impose a selection pressure for the evolution of tolerance in a sensitive species, but in some areas the distribution of Ribwort Plantain were the same. This provides that other conditions affect the tolerance of trampling for Ribwort Plantain.
Competition between individuals is essential, and is one of the driving forces behind evolution. However, competition has different effects depending on the circumstances. Of course, competition between plants is different than between animals (Miller 1995), and interspecific competition has different effects than intraspecific competition. Plants compere by trying to gather as many resources as possible, as they cannot get up and go somewhere more plentiful. Some expand their root systems to collect more water and nutrients, and other grow taller to collect more sunlight. Either way, increasing competition will lower fitness and variation (Jones 2016) due to the plants having to share the same resources. In this experiment, we are using a protocol based around one developed by Miller and Schemske (1990) to determine the effects of intraspecific competition in Brassica rapa.
How does the vegetation surface type affect the amount of runoff? Speculate why this happens.
As a result of these factors, the flora has adapted to these conditions in a variety of ways including their shape, leaf type, root system, and color. One of the most prominent adapt...
For a species to survive and flourish within a given environment, it not only needs to replace itself but also all the other species around it exclusively. Hence, if one species completely replaces another species, the result is a single dominant species, a monoculture (source 2). According to Gause’s law, every species in a given environment occupies different niches for survival. Therefore, two separate species competing for similar resources cannot fundamentally coexist (source Gause). This is known as the competitive exclusion principle. When comparing animal niche’s to that of different autotrophic plants, one can rather easily differentiate adequate ecological niches for the animal species merely based on food-requirements (P.J. Grubb). On the contrary, many autotrophic plants contradict the competitive exclusion principle by sharing similar ecological niches such as sunlight, carbon dioxide, water, and alike mineral nutrients (p.j. grubb).
The communities of various native plants have been significantly minimized as a result of ...
2008). In this experiment, two deciduous tree species, speckled alder (Alnus incana ssp. rugosa) and white birch (Betula papyrifera), dominant in the lowland and highland ecosystems respectively, will be compared and contrasted in terms of their decomposition rate, leaf senescence, leaf herbivory, arthropod presence, soil characteristics, and microclimate. In other words, how do the abiotic and biotic interactions of an ecosystem influence the decomposition rate of leaf litter in said ecosystem, and how does it compare to another, different ecosystem over the course of early to later fall? This question is of importance as it has ramifications for the functioning and interconnectedness of ecosystems around the world (Smith and Smith 2015). To investigate this phenomenon in action, the leaves from both tree species will be will be placed in their native habitat ecosystems as well as in the respective other to determine their decomposition rate and the degree to which the surrounding environment influences said decomposition. The highland ecosystem is noticeably more dry and rocky, with lower plant density and uneven topography than the lowland site – which is considerably more moist, muddy (i.e. wetland) and has a greater plant density than the highland. In leaf herbivory, the leaf damage caused by insect guilds is investigated to observe differences and changes between the two tree species over a period of time. Leaf senescence, the purposeful re-allocation of foliage nutrients to the plant body in preparation for winter, is studied in respect to the changing in the colour and appearance of leaves over the course of the experiment (Smith and Smith 2015). In addition, arthropod pitfall traps are used to characterize and compare the different species of arthropods and other organisms present within each
[1] “Mixedwood Plains.” Canadian Ecozones. Toronto: n.p., n.d. N. pag. TDSB Online Library School Sites. Web. 13 Dec. 2013. .
A wildfire is one example of secondary succession. When a disturbance in the environment occurs, such as a wildfire, either part or all of the community is destroyed. The aftermath of the wildfire leaves a barren landscape open to new growth, vegetation, and re-colonization of plant species (Gurevitch et al, 2002). Various studies have been undertaken and completed regarding the restoration and recovery of plant communities following wildfires. These studies include aspects of species richness during colonization to niche development.
Native plants in any given area have adapted to all the other organisms in a given area and genetically diverse ecosystems are generally maintained.
a) The Daintree rainforest at Cape Tribulation, in far north Queensland is diverse in many ways. It holds 12 of the 19 primitive plant families in the world (Cairns Today, 2007). The forest covers an area of 1100 square kilometres and is approximately eighty kilometres wide. This dense and luxuriant rainforest has the greatest diversity than any other in Australia and many in the world. The Daintree is also the home of rare and threatened of being extinct plant and animal species. The importance of this ecosystem is the very high. This ecosystem contributes to the overall health of this plant in many ways. The diversity contributes in the breakdown of pollution and helps to control the climate to name a few. This rainforest also is a great ‘carbon sink’. It has many photosynthesising plants and this allows the control of carbon dioxide (CO2). The plants take in the CO2 from the atmosphere and return oxygen (O2)
Thesis: Forests provide the earth with a regulated climate, strong biodiversity, and good nutrient rich soil for plants to strive on.
One of the reasons for loss in biodiversity is alteration of habitats. A habitat is the natural environment in which a species of living organism lives. If the habitat of a species is changed, it will cause the species to die or migrate to other places where it can find its natural habitat. There are many ways in which the habitat of plants and animals can be altered. One of them is land use changes. Since the beginning of human life, human beings have been changing land use for farming. Large areas of forests have been cleared by humans to increase the area of farming to satisfy their growing needs. Many biodiversity-rich landscape characteristics have been lost due to intensive farming (Young, Richards, Fischer, Halada, Kull, Kuzniar, Tartes, Uzunov & Watt, 2007). For example, traditional farming was replaced by private farms in Europe after the First World War causing an immense change in land use patterns. Another major proble...