Cloning and Aggression among Sea Anemones Essay

Cloning and Aggression among Sea Anemones - Essay ExampleThese clones apace spread out and form large aggregations of individuals exhibiting polymorphism. Individuals present in the center of clones are bigger with gonads, and reproduce intimately. Individuals at the edge of the colony are smaller, with larger fighting tentacles (acrorhagi), being defensive in nature reproduce asexually. This division of labor allows individuals in the center to expend more energy on sexual reproduction and individuals on the edges of aggregations to expend their energy on developing large acrorhagi to fight the individuals of adjacent clones. Aggression is provoked when individuals on the circumference come into suffer with genetically different clones. Acrorhagi, which are large projections loaded with nematysts located at the base of the tentacles, are used to sting, injure, and even kill members of the other clone. This inter-clonal fighting results in clear boundaries between adjacent aggregat ions. This aggressive behavior is fused on non-clone distich, as members of each clone can distinguish their own clone mates and do not attack them. Intraspecific competition of the inference sort has also been observed in experiments where two adjacent clones competed over the resource of space.The entailment level for put down position, clonal/aclonal growth, and aggressiveness... Rare species were excluded for consistency and simply sharpen the focus of the present study.Study sitesThe samples were collected from two long north-south gradients extending from subarctic to semitropic latitudes.(Further details see L.Francis,1988,p.243)Assignment to categoriesThe samples are categorized based on habitat, individual body size, clonal, aggressive nature.Statistical methodThe significance level for shore position, clonal/aclonal growth, and aggressiveness acting simultaneously is determined by using a multi-way G-test. In addition, Fishers exact test with critical alpha levels corr ected to requite for multiple use of data is also used since some of the theoretically possible sets are though empty, is permissible, if conservative, to use comparison wise error rate = 1 - ( 1 - )1/c, where c is the number of comparisons and is the desired level of confidence Sidak, 1967, cited in SAS guide, 1985. (For three sets of comparisons, a comparison wise error rate of 0.0165 is equivalent to an observational error rate of 0.05.)Development of a modelA geometric model is developed to predict the relative energy efficiency of interference as a function of increasing size (1) for growth through isometric increase in size (simulated growth of an aclonal adult), and (2) for growth without increasing in prime (simulated growth and spread of a compact, encrusting clone).ResultsCorrelationsFrom the observations, it was evident that overall distribution of species was uneven with respect to shore position, clonal/aclonal growth and aggressiveness. Tested separately, two of the three pair wise interactions were significant (for cloning vs. aggression and