Hello Sai

Yes it is possible. At a time more than one phytoplankton species can bloom in the same site. Probably it is because these species have slightly different resource requirements and sometimes they share niches.

You may look into this link: http://plankt.oxfordjournals.org/content/25/7/799.full.pdf

Good luck!

Dola.

thank u very much Dr.Dola............

A lot of algae species are found at the same place at the same time, but that also every time (day, month, year) you sample, you get different algae.

Yes, it is posible, sometimes Cyanobacteria species, when the phosphorous and Nitrogen components increase in the wáter. During red tides, sometimes you can find two species, but one of them used to be dominant.

@Mherinia thank u very much sir

True, multiple blooms may occur. nutrient preferences by the species, and different functional space in the microcosms or micro-habitat are key factors. Its also important to note that the number of concurrent blooms and its effect are regulated via

trophic structure i.e. a top-down regulation of phytoplankton biomass

yes , it is possible to have bloom of different species ; in spring in central eastern Mediterranean, every year I have a bloom of different diatoms (pseudo nitszchia spp, Leptocylindrus danicus, Rhizosolenia delicatula and chaetoceros spp); in coastal area, i can find also a bloom of neritic dinoflagellates such as Prorocentrum triestinum and other necked dinoflagellates

Algal bloom means a significant increase in the algal populations. For a bloom to occur, there must be a great number of nutrients available for consumption. If two phytoplankton populations rely on different nutrients and sources, then the two can co-exist and even bloom together. This is because they occupy separate niches, which still doesn't cause competitive exclusion.

Yes it is possible, most especially if two phytoplankton populations depend on two different types of nutrients. In this case, they don't have to compete with each another, thus leading to co-existence. Also, there is no niche overlap for the two types of phytoplankton so no competitive exclusion will occur. Of course it is important to take note that this is only possible if both types of nutrients available for the two phytoplankton populations exist in large amounts. If this weren't the case, then they may result to competition for one same source, thus leading to high mortality in the other phytoplankton population. In turn, they won't occur simultaneously because one has to dominate, and one has to be displaced.

Hope this helps! Good luck!

It is possible. This just tells us that these two phytoplankton species have different nutrient requirements or there is an abundance of the nutrients these two need. It is important to know that for two species to exist, such as this, there must be an abundance of resources or the two species have adapted to have needs that are different. Because if this is not met, one species will out compete the other and will eventually dominate.

A bloom only occurs when growth processes are higher than the removal processes. Growth is influences by bottom up controls such as light and nutrient availability while the removal is governed by grazing or physical removal via sinking etc. If one species grows better, maybe due to limited grazing or excess nutrients they will dominate since they can out compete all the others. This is highlighted in some harmful algal bloom events such as brown tides. These blooms are terminated when the removal processes catch up with growth. I think one answer to your question is that yes two species can bloom together as Yanni points out. For example during the spring bloom there are plenty of nutrients so diatoms who can grow quickly bloom. As nitrogen runs out you see those species with lower affinities for low N sources (higher half saturation constants) drop out of the mix and eventually when silicate, a requirement for all diatoms is sucked down you get succession to a whole other group, typically small flagellates with low nutrient and no silicate requirements take over. Phytoplankton blooms also frequently co-occur with bacterial blooms. During brown tide and some red tide blooms the heterotrophic bacterial community is an order of magnitude higher than during non-bloom conditions.

I saw many times two species can bloom together in the same depth or in the same column different depths...

All best