Therefore, the exponential growth equation is only an estimate of what would occur in a larger population equations for ideal exponential growth exponential growth, the number of fronds, n , at a given time t is given by equation 1 , where: n o = number of starting fronds and k = exponential growth rate constant. Population growth and competition in lemna sp and spirodela sp 1 ovric p estioko group smiley sec f-2l june 24, 2013 1 a technical paper submitted in partial fulfillment of the requirements in bio 150. Over a 4-week period, students conduct investigations and analyze the carrying capacity and biotic potential of a model plant species, lemna minor (duckweed) they formulate a hypothesis, collect data, and analyze exponential and logistical population growth they also discuss and apply knowledge ga.
1 1 population growth and competition in aquatic lemna sp and spirodela sp michelle cama group 2 sec x - 3l december 17, 2012 _____ 1 a scientific paper submitted in partial fulfillment of the requirements in principles of ecology laboratory under dr analida c manila-fajardo, 2nd sem, 2012-1013. Abstract population growth and competition on two aquatic species, lemna and spirodela were observed in respect with population size and carrying capacity fronds of both plants were placed in jars labelled as pure and mixed culture, with two treatments for each culture. Population growth in lemna (duckweed) a introduction an understanding of the dynamics of population growth and the factors that may influence population growth and resource competition in lemna minor and.
The growth rate of the population under these conditions is density independent the population grows unimpeded by resource limitation or competition we can estimate the intrinsic rate of growth (r - see the equations on following pages) by measuring the uninhibited growth of low density populations. Salvinia competition (lemna) 60 the growth rate of salvinia is significantly larger than that of lemna likewise, the carrying capacity of salvinia is almost ten times larger than the carrying capacity of lemna discussion: plant population growth lab. The effect of high population densities on the growth rate of lemna minor (l) was studied under laboratory conditions at 23 °c in a medium with sufficient nutrients at high population densities, we found a non-linear decreasing growth rate with increasing l minor density.
Population growth and resource competition of lemna and azolla (tables and graphs only) population regulation in an annual and a perennial grass: plastic responses, birth rates and death rates. Population growth 1 lab 2 population growth in lemna (duckweed) a logistic growth model will describe population growth in lemna grown under controlled using spreadsheets to model population growth, competition, and predation in nature the american biology teacher 61:294-296 gause, gf 1934 the struggle for existence. Lemna is a genus of free-floating aquatic plants from the duckweed family these rapidly growing plants have found uses as a model system for studies in community ecology , basic plant biology, ecotoxicology , and production of biopharmaceuticals , and as a source of animal feeds for agriculture and aquaculture.
Population growth is the change in population over time, and can be quantified as the change in the number of individuals in a population using per unit time for measurement (wikipediacom) a population can grow in an exponential or logistic growth pattern. Name: apes lab: population growth in duckweed, lemna minor objective: students will analyze the carrying capacity and biotic potential of a model plant species, lemna, minor (duckweed) background: read the background provided and take notes on the following: population growth models exponential population growth and its associated equation. In this scenario, competition for food is a density-dependent limiting factor in general, we define density-dependent limiting factors as factors that affect the per capita growth rate of a population differently depending on how dense the population already is most density-dependent factors make the per capita growth rate go down as the population increases.
Population and competition lemna minor is structurally adapted to grow quickly that enables it to populate bodies of water rapidly it overcomes inter-species competition by growing a thick carpet over still water bodies, thereby shading out other plant species below it and eliminating the competitionwith intra-specific competition, it will compete by absorbing as much of its surrounding. Population growth data for salvinia minima with in the competition experiment, salvinia minima proved to be the better competitor especially those that were found under the initial layer of growth salvinia minima salvinia growth of salvinia minima and lemna minor, 2. The objective of this experiment was to analysis the growth of a lemna population materials and methods january 13 to march 3, 1994, the experiment was conceived in a biology laboratory at camosun college during a class period.
Lemna population growth lab: comparing growth models in spss dan flynn goals: 1 find best parameter estimates for lemna population growth according to logistic and exponential growth models 2 determine which model fits best this example is based on the lemna growth experiment starting with 2 or 15 individual thalli estimating carrying capacity, k, and the intrinsic rate of increase, r. Lemna minor (common duckweed or lesser duckweed) is a species of lemna (duckweed) with a subcosmopolitan distribution, native throughout most of africa, asia, europe and north america, occurring everywhere that freshwater ponds and slow-moving streams occur, except for arctic and subarctic climates. Experiment # lemna minor (duckweed) population growth introduction – students will grow duckweed (lemna minor) over a two to three week period to observe what happens to a population of organisms when allowed to grow without predation or competition objectives-understand some of the factors that affect population growth, like method of reproduction (asexual or.