57-467: The Gippsland Plains Grassy Woodland is an ecological temperate grassland community located in the Gippsland region in southern Victoria , Australia. Stretching from Bairnsdale in the east to the eastern portion of Melbourne in the west, they typify one of Victoria's most threatened and disconnected indigenous ecosystems. The Gippsland Red Gum Grassy Woodland is the most prominent community in
114-507: A community is a group or association of populations of two or more different species occupying the same geographical area at the same time, also known as a biocoenosis , biotic community , biological community , ecological community , or life assemblage . The term community has a variety of uses. In its simplest form it refers to groups of organisms in a specific place or time, for example, "the fish community of Lake Ontario before industrialization". Community ecology or synecology
171-443: A tree canopy , but it has mostly been cleared. Shrubs are thinly distributed in both forms, with a cover of less than 10 per cent. However, despite being mostly cleared, the community is still sparsely present on roadsides or railways, cemeteries and nature reserves . Annual rainfall typically ranges between 570 mm and 650 mm, and elevation is relatively low at 20–40 m above sea level. The Gippsland Red Gum Grassy Woodland ecoregion
228-449: A V-shaped cross section, and generally exhibit peg-like projections or “teeth” along the leaf midrib and margins. It is clonal , meaning one plant or colony consists of multiple genetically identical ramets connected via a rhizome , and it is capable of both vegetative (asexual), and sexual reproduction . Shoots can appear up to 30 cm apart along rhizomes, but usually less. Inflorescences are 20–90 cm high and consist of
285-478: A biological community with respect to ecological interactions is referred to as community structure. Species can compete with each other for finite resources . It is considered an important limiting factor of population size , biomass and species richness . Many types of competition have been described, but proving the existence of these interactions is a matter of debate. Direct competition has been observed between individuals, populations and species, but there
342-568: A community is defined by the interactions between the organisms in it. All species are interdependent, each playing a vital role in the working of the community. Due to this communities are repeatable and easy to identify, with similar abiotic factors controlling throughout. Frederic Clements developed the holistic (or organismic) concept of community, as if it were a superorganism or discrete unit, with sharp boundaries. Clements proposed this theory after noticing that certain plant species were regularly found together in habitats, he concluded that
399-430: A community, by creating physical changes to the environment itself. These species can occupy any trophic level, but tend to be producers. Red mangrove is a foundation species in marine communities. The mangrove's root provides nursery grounds for young fish, such as snappers . Whitebark pine ( Pinus albicaulis ) is a foundation species. Post fire disturbance the tree provides shade (due to its dense growth) enabling
456-416: A community. They cause physical changes to the habitat and alter the resources available to the other organisms present. Dam building beavers are ecological engineers. Through the cutting of trees to form dams they alter the flow of water in a community. These changes influence the vegetation on the riparian zone , studies show biodiversity is increased. Burrowing by the beavers creates channels, increasing
513-472: A filter to the type of species that are present in the community. Each population has the same adaptive value (competitive and dispersal abilities) and resources demand. Local and regional composition represent a balance between speciation or dispersal (which increase diversity), and random extinctions (which decrease diversity). Species interact in various ways: competition, predation , parasitism , mutualism , commensalism , etc. The organization of
570-565: A fine scale in terms of local processes constructing (or destructing) an assemblage of species, such as the way climate change is likely to affect the make-up of grass communities. Recently this local community focus has been criticized. Robert Ricklefs , a professor of biology at the University of Missouri and author of Disintegration of the Ecological Community , has argued that it is more useful to think of communities on
627-411: A group means bigger prey can be taken, however, the food source must be shared. Wolves are group predators, whilst tigers are solitary. Predation is density dependant , often leading to population cycles. When prey is abundant predator species increases, thus eating more prey species and causing the prey population to decline. Due to lack of food the predator population declines. Due to lack of predation
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#1732765133372684-920: A mostly cleared, farming landscape. The zone is bounded by the Strzelecki Ranges to the East, the Great Dividing Range to the North and the Mornington Peninsula to the West, reaching Cranbourne and Westernport in Melbourne's east. The community caters to many nationally and state-listed threatened plants and animals. The open grasslands of the Central Gippsland Plains used to cover about 600 km of land and
741-405: A regional scale, drawing on evolutionary taxonomy and biogeography , where some species or clades evolve and others go extinct. Today, community ecology focuses on experiments and mathematical models, however, it used to focus primarily on patterns of organisms. For example, taxonomic subdivisions of communities are called populations , while functional partitions are called guilds . Within
798-472: A role in the trophic pyramid. They provide energy source and nutrients to the plant species in the community. Decomposers such as fungi and bacteria recycle energy back to the base of the food web by feeding on dead organisms from all trophic levels. A guild is a group of species in the community that utilize the same resources in a similar way. Organisms in the same guild experience competition due to their shared resource. Closely related species are often in
855-518: A slender scape with fragrant flowers with blue-purple tepals and yellow stamens , which develop into dark blue-purple fruits following buzz pollination by native bees. It is partially summer deciduous when water stressed, but can flower from October to April in favourable conditions. Dianella amoena was first described in 1995 by G.W Carr and P.F. Horsfall. Before being formally described, known populations were referred to as Dianella. sp. nov. (Nutfield). Its specific epithet comes from
912-475: A species changing gradually along complex environmental gradients. Each species changes independently in relation to other species present along the gradient. Association of species is random and due to coincidence. Varying environmental conditions and each species' probability of arriving and becoming established along the gradient influence the community composition. Individualistic theory proposes that communities can exist as continuous entities, in addition to
969-418: A vampire bat feeding on a cow. Parasitism can however lead to death of the host organism over time. Another example is the feeding on plants of herbivores , for example, a cow grazing. Herbivory is a type of predation in which a plant (the prey in this example) will attempt to dissuade the predator from eating the plant by pumping a toxin to the plant leaves. This may cause the predator to consume other areas of
1026-446: Is a result of a parasitic relationship between a female Anopheles mosquito and Plasmodium . Mosquitos get the parasite by feeding on an infected vertebrate. Inside the mosquito the plasmodium develops in the midgut's wall. Once developed to a zygote the parasite moves to the salivary glands where it can be passed on to a vertebrate species, for example humans. The mosquito acts as a vector for Malaria. The parasite tends to reduce
1083-458: Is an interaction between species in which both species benefit. An example is Rhizobium bacteria growing in nodules on the roots of legumes. This relationship between plant and bacteria is endosymbiotic , the bacteria living on the roots of the legume. The plant provides compounds made during photosynthesis to the bacteria, that can be used as an energy source. Whilst Rhizobium is a nitrogen fixing bacteria, providing amino acids or ammonium to
1140-657: Is listed as "Critically Endangered" under the Flora and Fauna Guarantee Act 1988 state legislation in Victoria , and "Rare" under the Threatened Species Protection Act 1995 state legislation in Tasmania . The main threats to the species are weed invasion, habitat disturbance, mowing and grazing. A recovery plan was prepared in 2010, and estimated 1,400 plants remained over 120 locations, however
1197-460: Is little evidence that competition has been the driving force in the evolution of large groups. Predation is hunting another species for food. This is a positive-negative interaction, the predator species benefits while the prey species is harmed. Some predators kill their prey before eating them, also known as kill and consume. For example, a hawk catching and killing a mouse. Other predators are parasites that feed on prey while alive, for example,
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#17327651333721254-853: Is located at wetter sites with poor soil to the south and west of the central Gippsland plain, from coastal Gippsland in the south to Traralgon , where it features thinly scattered eucalypts, such as Eucalyptus ovata and Eucalyptus viminalis . Furthermore, the New Zealand native Kunzea ericoides has invaded some parts of the grassland. The groundcover features many different wildflowers , including Arthropodium strictum , Chrysocephalum apiculatum and Xerochrysum palustre, Dianella revoluta , Diuris punctata , Acaena echinata , Hypericum gramineum , Dianella amoena , Chrysocephalum apiculatum , Dichondra repens , Drosera peltata , Hydrocotyle laxiflora , Poranthera microphylla , Thysanotus patersonii , Tricoryne elatior and Wurmbea dioica , which inhabit
1311-407: Is passed up through trophic levels. Energy is lost at each level, due to ecological inefficiencies . The trophic level of an organism can change based on the other species present. For example, tuna can be an apex predator eating the smaller fish, such as mackerel. However, in a community where a shark species is present the shark becomes the apex predator, feeding on the tuna. Decomposers play
1368-442: Is so named because Eucalyptus tereticornis is prevalent, in addition to Eucalyptus bridgesiana , Eucalyptus camaldulensis , Eucalyptus globoidea , Eucalyptus angophoroides , Eucalyptus bosistoana , Eucalyptus pauciflora , Eucalyptus melliodora and Eucalyptus polyanthemos , as well as patches of Allocasuarina littoralis , Acacia implexa , Acacia mearnsii and Allocasuarina verticillata . The South Gippsland Plains Grassland
1425-663: Is the study of the interactions between species in communities on many spatial and temporal scales, including the distribution, structure, abundance, demography , and interactions of coexisting populations. The primary focus of community ecology is on the interactions between populations as determined by specific genotypic and phenotypic characteristics. It is important to understand the origin, maintenance, and consequences of species diversity when evaluating community ecology. Community ecology also takes into account abiotic factors that influence species distributions or interactions (e.g. annual temperature or soil pH ). For example,
1482-542: The biodiversity of the community. A species' trophic level is their position in the food chain or web. At the bottom of the food web are autotrophs , also known as primary producer . Producers provide their own energy through photosynthesis or chemosynthesis , plants are primary producers. The next level is herbivores (primary consumers), these species feed on vegetation for their energy source. Herbivores are consumed by omnivores or carnivores . These species are secondary and tertiary consumers. Additional levels to
1539-526: The Forest Red Gum Grassy Woodland around 1200 km at the time of European settlement, but are now most likely nonexistent. The Forest Red Gum Grassy Woodland is situated on Lower Pleistocene gravels, sands, silts and clays, with some Tertiary alluvium . The community is situated on undulating to generally flat plains that are less than 100 metres above sea level, with some presence on low hills up to 220 metres. There used to be
1596-627: The Latin amoenus , meaning beautiful or pleasing. This is in reference to the plant's appearance, particularly the fragrant, colourful flowers which are in the upper size range for Dianella . A phylogenetic study of Dianella taxa using combined chloroplast DNA and nuclear DNA placed Dianella amoena samples among some members of the Dianella longifolia species complex and Dianella tarda , Dianella porracea , and Dianella crinoides , suggesting these taxa to be its closer relatives in
1653-588: The areas between tussocks. Grasses include tussock grasses such as Themeda triandra , and as well as Austrodanthonia laevis, Pentapogon quadrifidus , Wahlenbergia gracilis , Austrostipa , Hypoxis hygrometrica , Lomandra filiformis , Carex breviculmis , Microlaena stipoides , Schoenus apogon , Themeda triandra , Hemarthria uncinata var. uncinata, Lachnagrostis spp. and Juncus subsecundus . Animals include Lathamus discolor , Anthochaera phrygia , Litoria raniformis , Dasyurus maculatus and Isoodon obesulus . Ecological community In ecology,
1710-424: The bee. The plant benefits through fertilisation, whilst the bee is provided with food. Commensalism is a type of relationship among organisms in which one organism benefits while the other organism is neither benefited nor harmed. The organism that benefited is called the commensal while the other organism that is neither benefited nor harmed is called the host . For example, an epiphytic orchid attached to
1767-475: The community, each species occupies a niche . A species' niche determines how it interacts with the environment around it and its role within the community. By having different niches species are able to coexist. This is known as niche partitioning. For example, the time of day a species hunts or the prey it hunts. Niche partitioning reduces competition between species such that species are able to coexist because they suppress their own growth more than they limit
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1824-406: The connections between habitats. This aids the movement of other organisms in the community such as frogs. Community structure is the composition of the community. It is often measured through biological networks , such as food webs . Food webs are a map showing species networks and the energy that links the species together through trophic interactions. Holistic theory refers to the idea that
1881-418: The discrete groups referred to in the holistic theory. Stephen P. Hubbell introduced the neutral theory of ecology (not to be confused with the neutral theory of molecular evolution ). Within the community (or metacommunity ), species are functionally equivalent, and the abundance of a population of a species changes by stochastic demographic processes (i.e., random births and deaths). Equivalence of
1938-461: The genus. However, many nodes in the molecular phylogeny were poorly supported. Further molecular and morphological research was suggested to resolve relationships among these taxa, and no taxonomic changes were advised. Dianella amoena inhabits grassland and grassy woodland ecosystems, often on volcanic soils. It has a sparse distribution across south-eastern Australia, mostly in the states of Victoria and Tasmania , with some records extending
1995-405: The growth of other species (i.e., the competition within a species is greater than the competition between species, or intraspecific competition is greater than interspecific). The number of niches present in a community determines the number of species present. If two species have the same niche (e.g., the same food demands) then one species outcompetes the other. The more niches filled, the higher
2052-411: The host to prepare an environment suitable for life. For example, kelp has a root like system, called a holdfast , that attaches it to the seabed. Once rooted it provides molluscs , such as sea snails, with a home that protects them from predation. The opposite of commensalism is amensalism , an interspecific relationship in which a product of one organism has a negative effect on another organism but
2109-465: The loss of the wolf population through overhunting resulted in the loss of biodiversity in the community. The wolves had controlled the number of elks in the park, through predation. Without the wolves the elk population drastically increased, resulting in overgrazing . This negatively affected the other organisms in the park; the increased grazing from the elks removed food sources from other animals present. Wolves have since been reintroduced to return
2166-652: The mosquito's lifespan and inhibits the production of offspring. Dianella amoena Dianella amoena , commonly known as the matted flax-lily , is an endangered, herbaceous , perennial plant endemic to Australia. It belongs to the family Asphodelaceae , subfamily Hemerocallidoideae . It has long grey-green leaves which grow in clumps from an underground rhizome , and displays blue-purple flowers in spring-summer, up to 90 cm in height. The common name Matted Flax-lily refers to its extensively rhizomatous nature, sometimes forming large mats up to 5m wide. The slender, grey-green leaves of Dianella amoena have
2223-425: The original organism is unaffected. An example is an interaction between tadpoles of the common frog and a freshwater snail . The tadpoles consume large amounts of micro-algae. Making algae less abundant for the snail, the algae available for the snail is also of lower quality. The tadpole, therefore, has a negative effect on the snail without a gaining noticeable advantage from the snail. The tadpoles would obtain
2280-493: The park community to optimal functioning. See Wolf reintroduction and History of wolves in Yellowstone for more details on this case study. A marine example of a keystone species is Pisaster ochraceus . This starfish controls the abundance of Mytilus californianus , allowing enough resources for the other species in the community. An ecosystem engineer is a species that maintains, modifies and creates aspects of
2337-561: The plan considered Dianella amoena endemic to Victoria as records outside of Victoria were limited at the time. A more recent population estimate considering the entire range of the species is unavailable. The extensively rhizomatous nature of the species makes accurate population estimation difficult, as genetically distinct plants cannot be easily distinguished. The species has also been subject to numerous translocations , both for conservation and development mitigation purposes, which may have impacted total population size. Some plants in
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2394-416: The plant communities inhabiting deserts are very different from those found in tropical rainforests due to differences in annual precipitation. Humans can also affect community structure through habitat disturbance , such as the introduction of invasive species . On a deeper level the meaning and value of the community concept in ecology is up for debate. Communities have traditionally been understood on
2451-441: The plant or not consume the plant at all. Predation may affect the population size of predators and prey and the number of species coexisting in a community. Predation can be specialist, for example the least weasel predates solely on the field vole. Or generalist, e.g. polar bear primarily eats seals but can switch diet to birds when seal population is low. Species can be solitary or group predators. The advantage of hunting in
2508-462: The plant. Insects pollinating the flowers of angiosperms , is another example. Many plants are dependent on pollination from a pollinator. A pollinator transfers pollen from the male flower to the female's stigma . This fertilises the flower and enables the plant to reproduce. Bees, such as honeybees , are the most commonly known pollinators. Bees get nectar from the plant that they use as an energy source. Un-transferred pollen provides protein for
2565-447: The prey population increases. See Lotka–Volterra equations for more details on this. A well-known example of this is lynx - hare population cycles seen in the north. Predation can result in coevolution – evolutionary arms race , prey adapts to avoid predator, predator evolves. For example, a prey species develops a toxin that kills its predator and the predator evolves resistance to the toxin making it no longer lethal. Mutualism
2622-503: The range into New South Wales . The species exists in small fragments of its original range in roadsides, railways, and urban nature reserves, often in degraded habitats. Recruitment is believed to be non-existent, but it is long-lived and persists in remnant clonal patches. Dianella amoena is listed as "Endangered" under the Environment Protection and Biodiversity Conservation Act 1999 federal legislation. It
2679-527: The regrowth of other plant species in the community, This growth prompts the return of invertebrates and microbes needed for decomposition. Whitebark pine seeds provide food for grizzly bears. Keystone species have a disproportionate influence on the community than most species. Keystone species tend to be at the higher trophic levels, often being the apex predator. Removal of the keystone species causes top-down trophic cascades . Wolves are keystone species, being an apex predator. In Yellowstone National Park
2736-426: The same amount of food with or without the presence of the snail. An older, taller tree can inhibit the growth of smaller trees. A new sapling growing in the shade of a mature tree struggles to get light for photosynthesis. The mature tree also has a well-developed root system, helping it outcompete the sapling for nutrients. Growth of the sapling is therefore impeded, often resulting in death. The relationship between
2793-403: The same guild, due to traits inherited through common descent from their common ancestor . However, guilds are not exclusively composed of closely related species. Carnivores, omnivores and herbivores are all basic examples of guilds. A more precise guild would be vertebrates that forage for ground dwelling arthropods , this would contain certain birds and mammals. Flowering plants that have
2850-405: The same pollinator also form a guild. Certain species have a greater influence on the community through their direct and indirect interactions with other species. The population of influential species are affected by abiotic and biotic disturbances. These species are important in identifying communities of ecology. The loss of these species results in large changes to the community, often reducing
2907-523: The species in the community leads to ecological drift. Ecological drift leads to species' populations randomly fluctuating, whilst the overall number of individuals in the community remains constant. When an individual dies, there is an equal chance of each species colonising that plot. Stochastic changes can cause species within the community to go extinct, however, this can take a long time if there are many individuals of that species. Species can coexist because they are similar, resources and conditions apply
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#17327651333722964-400: The species were dependent on each other. Formation of communities is non-random and involves coevolution . The Holistic theory stems from the greater thinking of Holism —which refers to a system with many parts, all required for the system to function. Henry Gleason developed the individualistic (also known as open or continuum) concept of community, with the abundance of a population of
3021-413: The stability of the community. Climate change and the introduction of invasive species can affect the functioning of key species and thus have knock-on effects on the community processes. Industrialization and the introduction of chemical pollutants into environments have forever altered communities and even entire ecosystems. Foundation species largely influence the population, dynamics and processes of
3078-678: The system situated in the centre. Situated in the South East Coastal Plain , the Gippsland grasslands consist of South Gippsland Plains Grassland (east), Central Gippsland Plains Grasslands (centre) and Forest Red Gum Grassy Woodland (west) in southern Victoria, where they border Victorian Volcanic Plain grasslands in the west. The vegetation community was once ubiquitous across the Gippsland plain, but now only less than five per cent of its original extent remains, partly consisting of sporadic vegetation areas encircled by
3135-435: The tree for support benefits the orchid but neither harms nor benefits the tree. This type of commensalism is called inquilinism , the orchid permanently lives on the tree. Phoresy is another type of commensalism, the commensal uses the host solely for transport. Many mite species rely on another organism, such as birds or mammals, for dispersal. Metabiosis is the final form of commensalism. The commensal relies on
3192-420: The trophic scale come when smaller omnivores or carnivores are eaten by larger ones. At the top of the food web is the apex predator , this animal species is not consumed by any other in the community. Herbivores, omnivores and carnivores are all heterotrophs . A basic example of a food chain is; grass → rabbit → fox. Food chains become more complex when more species are present, often being food webs. Energy
3249-453: The two trees is amensalism, the mature tree is unaffected by the presence of the smaller one. Parasitism is an interaction in which one organism, the host, is harmed while the other, the parasite, benefits. Parasitism is a symbiosis , a long-term bond in which the parasite feeds on the host or takes resources from the host. Parasites can live within the body such as a tapeworm . Or on the body's surface, for example head-lice . Malaria
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