The use of different planting techniques the use of tubers, bulbils and oospores and their ollection was also very detailed and methodic. The results showed that C.
Although there ere a few places that I thought needed to be addressed further such as the pH levels and the source lake of P. Tell us what you need to have done now! It was also revealed that different planting techniques emerged faster than others and which type of technique ended up being more dominant to the conclusion of the experiment.
Conclusion The article was very informative and resulted in an interesting take on competing plant species and the effects of light on these same plant species.
Not surprisingly it was also determined that due to the canopy shape of C.
In general, plants emerged more rapidly at a higher temperature than they did at a lower temperature. This is the first of two experiments conducted and revolves around the effects of temperature and length of day on the emergence of the two specified species of plants.
It was noted that neither light nor early emergence explained this twist. Could this oversight or omission have affected the efficiency of both plant species in comparison to a more direct and natural light source, or was it purely another nonissue within the confines of the experiment?
There was very little to disagree with on both of these points as the authors Competition between chara aspera and p very thorough and completed the experiment with accuracy and knowledge of the subject.
The results of the second experiment were presented and confirmed that P. The two visuals that I ound to be most helpful was Fig. Competition between Chara aspera and Potamogeton pectinatus as a function of temperature and light.
This, ultimately, lowered the value of this graph in the whole scheme of the article. The article then goes on to reveal how the second experiment was set up and conducted and revolved around light source competition between the two plant species.
Would these plants have been a hindrance or in completion for nutrients and resources to those plants that had not yet broke through.
Although these were used as more of a place setting between the C. Summary The authors include a brief history of Lake Veluwemeer and give a concise overview of how eutrophication led to the survival of the P. Van den Berg, Hugo Coop, Jan Simons and Annemarie de Keizer, it was theorized that one type of aquatic plant may be a better competitor for sunlight than another plant that is more of a bottom dweller.
I found this to be quite odd as this was a major part of the experiment and article subject matter and was almost a throwaway of the entire experiment. The only issue that can be pointed out with this step was that the tubers were not collected from Lake Veluwemeer but from Lake Eemmeer although the two locations are in close proximity to each other.
References Van den Berg, M. Another factor must be involved in this shift, which unfortunately we were not able to emonstrate this factor in the laboratory. It was then stated that although the results should have shown that P.
In Table 2 on pageit stated and gave evidence of confidence levels as to the data; simply stating that C. Table 1 was not that helpful as it was previously stated above that there was an issue with pH levels and this was, in the end, not accounted for. This may or may not have affected the speed of the plants natural growth patterns or cycle and even their ability to carry out the process of photosynthesis but that can only be speculated by the reader.
There is no indication that this was the case but there is also no indication that it was not. On the flip side of that argument, it is also possible that aquatic organisms could have fed off of these newly sprouted plants and essentially mimicked the removal by the scientists.
The use of tweezers in the control experiment was also something that raised an eyebrow. Possible errors in the study were then given by the authors.
The answer to these questions is unclear, as in a real lake environment, the plants would have remained in the sediment.
In the discussion section of the article, the data and results were reiterated and the authors then compared the results to their hypothesis. The results were then presented for the two experiments with the mergence experiment first and then the competition experiment lastly.Two experiments were carried out to study the interaction between Chara aspera Deth.
ex Willd. and Potamogeton pectinatus L.
The purpose of the first experiment was to assess the effect of. Competition between Chara aspera and Potamogeton pectinatus as a function of temperature and light Introduction In the article “Competition between Chara aspera and Potamogeton pectinatus as a function of temperature and light” by authors Marcel S.
Van den Berg, Hugo Coop, Jan Simons and Annemarie de Keizer, it was theorized that one. A growth experiment showed ash-free biomass for P. pectinatus was nearly two times as high as for C.
aspera at 3 mM HCO3−, but almost two times lower at mM than at Two experiments were carried out to study the interaction between Chara aspera Deth. ex Willd. and Potamogeton pectinatus L.
The purpose of the first experiment was to assess the effect of temperature on the rate of emergence and the second was designed to study the effect of light on the competition during the established phase. Competition experiment A second experiment was conducted to study the effect of light on the competition between C.
aspera and P. pectinatus of established plants. A complete additive design was used ŽSpencer and Rejmanek,´ As an example, we present an analysis of competition between the charophyte Chara aspera Deth.
ex Willd. and pondweed Potamogeton pectinatus L. The model suggests that alternative equilibria may arise as a result of two positive feedbacks: the enhancement of transparency by macrophytes and a feedback caused by bicarbonate competition.Download