quora
Nobody downloaded yet

Nereis succinea - Essay Example

Comments (0) Cite this document
Summary
Introduction: (La) Although this topic is a new topic in terms of the impact of ocean acidification, a study carried out recently by Cripps and colleagues (2011) expressed that ocean conditions in the future would likely prevent fishes from adjusting to the changing food availability in the ocean…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER95.7% of users find it useful
Nereis succinea
Read TextPreview

Extract of sample
"Nereis succinea"

Download file to see previous pages Even as the decrease in feeding may indicate a decrease in olfactory sensing, greater levels of activity may refer to compensation through visual detection, i.e. a certain amount of time would have to be devoted in finding food. It is crucial to evaluate both parties in the interactions of predator and prey especially as both parties would likely be affected differently, eventually implying changes in the life of each party. Nereis succinea reproduction: (la) The mass spawning for the N. succinea is mostly seen from June to September at night during a new or full moon with temperatures higher than 16oC. This must however be influenced by the location population (Ram et al., 1999). The females give off the cysteine-glutathione disulphide (CSSG) when they swim. Such pheromone, first discovered by Zeeck et al. in 1998, seems to attract mates at depressed concentrations. The swimming of the male spawns becomes elevated (Ram et al., 2008) leading to a rise in the possibility of being faced with a sexually ready female (Fei et al., 2008). As these spawns meet, both males and females swim around each other in tight circles gradually becoming smaller in size. Males unleash some sperm along with the egg release pheromone (ERP) (Zeeck et al. 1996, 1998). Such ERP is made up mostly of inosine with glutamic acid and glutamine; it leads to the females releasing both eggs as well as significant amounts of sperm release pheromone (SRP), CSSG, at elevated levels (Hardege et al., 2004). Consequently, the males then unleash significant amounts of sperm, thereby leading to the fertilization of the female egg. Chemical nature of nereidid sex pheromones (la) Nereis succinea 1. Cysteine-glutathione disulphide (CSSG) Cysteine-glutathione disulphide (‘nereithione’) (CSSG) (Figure 10) is released by the female N. succinea while swimming; it is also considered a tetra- peptide pheromone. At low levels of concentration (10-9 M), CSSG causes the males to increase the pace and speed of their swimming; allowing the faster access to the slow-paced females. At elevated levels, (in excess of 10-6 M) CSSG causes the release of gametes by the male spawns (Ram et al., 1999). Glutathione (GSH) found in the body fluids and cysteine (amino acid) is utilized to provide synthesis for CSSG as needed. This production happens only during the heteronereid level of the life cycle (Hardege et al., 2004). Figure 10. Structure of the sex pheromone in N. succinea, CSSG (Source: Guidechem). Spawning hormones and pheromonal communication are responsible for the transduction of this information (Bentley and Pacey, 1992) eventually leading to the mass spawning phenomenon often seen for the nereidid species. 1. Males usually cover large distances as they swim over water surfaces seeking the slow swimming females. At some point, females may shift their swimming patterns, often swimming in circles for a few seconds. At which point, they may give off the sex pheromone 5-methyl-3-heptanone and start to swim in tighter circles (Zeeck et al., 1988). 2. Ripe males detecting swimming females may notice the pheromone in the water and change the quality of their swimming. They then return to the source of the ‘smell’ of the female while also giving off some coelomic fluid, which is otherwise referred to as a ‘sperm cloud’ (Hardege, 1999). Such sperm cloud includes the egg release pheromone (ERP), L – Ovothiol A (Rohl et al., 1999) (Figure 6). 3. The ERP then prompts the female to swim ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Nereis succinea Essay Example | Topics and Well Written Essays - 11000 words”, n.d.)
Retrieved de https://studentshare.org/biology/1484782-nereis-succinea
(Nereis Succinea Essay Example | Topics and Well Written Essays - 11000 Words)
https://studentshare.org/biology/1484782-nereis-succinea.
“Nereis Succinea Essay Example | Topics and Well Written Essays - 11000 Words”, n.d. https://studentshare.org/biology/1484782-nereis-succinea.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document
CHECK THESE SAMPLES - THEY ALSO FIT YOUR TOPIC
OSMOREGULATION IN CLAMWORMS
OSMOREGULATION IN CLAMWORMS Introduction: Neries belongs to the division Annelida and class Polychaeta. The worm has 160 segments with well developed setose parapodia. They are the common in tropical and temperate marine habitats. Their native is American Atlantic coasts.
5 Pages(1250 words)Essay
Effect of Ocean acidification upon ability to genetically adapt in Nereis species
The species adapt either phenotypically or genotypically to their new environment. High levels of CO2 in the atmosphere result in increased uptake of CO2 by ocean water thus decreasing
2 Pages(500 words)Essay
Effect of Ocean acidification upon ability to genetically adapt in Nereis species
Therefore the project aims to determine if the worms obtained from natural CO2 vents are different from those living under controlled conditions, in terms of behaviour and physiology. As summarised by Lawrence and Soame, (2009, p.3,363), ragworm (Nereis) species utilises
4 Pages(1000 words)Essay
Effect of Ocean acidification upon ability to adapt to climate change in Nereis species
In order to test that I sample animals from all these species exposed them short and long term to low pH and stored samples for gene expression. The hypotheses shall read as follows: P dumerilii has exhibited its
6 Pages(1500 words)Research Paper
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Let us find you another Essay on topic Nereis succinea for FREE!
logo footer
Contact us:
+16312120006
Contact Us Now
FREE Mobile Apps:
  • StudentShare App Store
  • StudentShare Google play
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • Miscellaneous
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us