Moon jellyfish (Aurelia aurita): The invasion

(Post by Aisha Kore)

Hillewaert, Hans. “Aurelia aurita.” 2008. https://commons.wikimedia.org/wiki/File:Aurelia_aurita_2.jpg. Accessed March 21, 2016.

 

Aurelia aurita, more commonly known as the moon jellyfish, is a species cartier bracelet
of jellyfish belonging to the Class Scyphozoa that fake cartier bracelet replica
is found in salt cartier replica water bodies how much does a cartier bracelet cost
all across www.callingallcakes.org the globe, though more notably cartierlovebracelet.co along coastal regions and ocean shelves (Lucas 2001). This jellyfish species is most commonly located in temperate waters and tropical waters (Stoecker et al. 1987), particularly northwest of Europe, in the Black Sea, around Japan, as well as in areas of North America (Lucas 2001). However, the moon jellyfish is very flexible and is able to adapt to many different hermes h bracelet
environment conditions (Lucas 2001). It is easily distinguished by the four horseshoe-like gonads (Lucas & Lawes 1998) seen from the top of its bell that give it the appearance of a flower. Moon jellyfish are armed with nematocysts, but unlike most other types of jellyfish, the stings are generally not considered dangerous to humans – although some moon jellyfish in certain areas of the world are capable of causing irritation to the skin – and people often play with them (Segura-Puertas et al. 2002). Additionally, these nematocysts have not been observed to take part in the capture of prey, either (Stoecker et al. 1987).

Moon jellyfish are considered to be generalists and feed www.callingallcakes.org on different types of zooplankton bracelet replica cartier (Costello & Colin 1994; Lucas 2001), phytoplankton, cypriids, ciliates, rotifers, copepods and bivalve and fish larvae (Stoecker et al. 1987). These jellyfish feed by capturing prey with the mucus lining the outside of their bodies; ciliary currents move the prey into food pouches found along the bell’s margin (Stoecker et al. 1987). The oral arms then move the mucus and prey into the gastric pouches (Stoecker et al. 1987). The prey density often influences the growth of the moon jellyfish (Lucas 2001). For instance, most populations of moon jellyfish are generally observed to have three main growth phases: winter to early spring, mid-spring and summer to autumn (Lucas 2001). Between winter and the beginning of spring, when the number of prey is relatively low, slow growth is observed; when food is abundant during bracelet replica cartier mid-spring, exponential growth is observed; and shrinkage is seen between summer and autumn as the jellyfish are beginning to reproduce (Lucas 2001). When high levels of prey are available, moon jellyfish are able to undergo very rapid growth thanks to its low carbon density; on the other hand, when not much food is available, the medusae tend to shrink to prepare to endure long periods of starvation (Lucas 2001). These states are observed to only be temporary as once food is abundant again, interestingly, the jellyfish will regain its original form, complete with fertile gonads (Lucas 2001).

In some areas around the world, during the summer months especially when the jellyfish start to reproduce, moon jellyfish blooms are a common sight (Lucas 2001). These blooms can have a very detrimental effect on the ecosystem along the coast (Stoecker et al. 1987), fisheries, tourism and even power stations, making them both a biological and an economical issue (Lucas 2001). As fish larvae are a part of the diet of the moon jellyfish, jellyfish blooms could cause a major problem for fisheries and the coastal populations of fish; additionally, the jellyfish could outcompete the fish larvae for food (Lucas 2001). On top of this, moon jellyfish blooms can also cause a number of other problems, as well, one of them being a bloom of a different organism: phytoplankton (Lucas 2001). If predatory pressure on the coastal phytoplankton population suddenly increases, but the levels of nutrient and light are high, “top-down regulation of plankton communities may also occur, resulting in increased phytoplankton blooms and alteration of species composition” (Lucas 2001). A moon jellyfish bloom is shown in the picture cartier bracelet of anastasia steele fifty
below.

Thyssen, Malene. “Vandmaend.” https://commons.wikimedia.org/wiki/File:Vandmaend.jpg. Accessed March 21, 2016.

Moon jellyfish blooms have proven to be a quite problem. Many replica cartier love bracelet Asian countries, especially China, regard jellyfish as a traditional delicacy (including me), but unfortunately, moon jellyfish are not harvested for this purpose (Li & Hsieh 2004); therefore, a different means of controlling the blooms will have to be established.