Asexual and Sexual Reproduction in Soft Corals
The battle between sexual and asexual reproduction is a competition that has been ongoing for millions of years. Somewhere along the way due to its higher level of genetic variation, sexual reproduction was able to overcome the two fold advantage of asexual reproduction, and now dominates reproduction in organisms. However, some types of organisms such as worms and corals have acquired the ability to reproduce both sexually and asexually. The purpose of this paper is to explore the differences in asexual and sexual reproduction both from a biological and an evolutionary standpoint and to explain why evolution has made it possible for soft corals to reproduce both sexually and asexually.
Introduction:
Soft corals are very widespread among the Great Barrier Reef and other Indo-Pacific coral reefs. On the Great Barrier Reef they may cover up to 37% of the reef area (Bastidas, et. al, 2001). Even though soft corals are abundant on the Great Barrier Reef they have been overshadowed by the study of hard corals. Very little research has been conducted on them, yet they are just as fascinating as their hard coral neighbors. The main purpose of this paper is to explain why evolution has made it possible for soft corals to reproduce both sexually and asexually. To do this I will first introduce soft corals, then explain the types of reproduction soft corals are capable of, and finally explain why evolution has made it possible for soft corals to reproduce both sexually and asexually, using numerous studies to support my claims. Most of the information on this topic was very species specific, but this paper will explain the reproductive evolution of soft corals in a broader array that will pertain to the scientific order Alcyonacea, or all types of soft corals.
What are soft corals?
Soft corals are grouped in the phylum Cnidaria, class Anthozoa, and order Alcyonacea. Their distinguishing characteristic is that their polyps always bear eight tentacles which are on both edges fringed by rows of pinnules (Fabricius and De’ath, 2002). The common name “soft coral” comes from the fact that they have no massive external skeleton as compared to the more commonly studied hard corals.
Earth, an endless source of wonder and beauty, produced the Great Barrier Reef. Hustling and bustling, the Reef thrives like a busy city, teeming with life. Sheltering thousands, corals, maintain the well-being of the Reef; however, the world threatens its nature and delicacy. Populations growing and technological advances increasing, the world becomes more and more disconnected with the natural world, posing an alarming risk for the planet we live on. Although many organizations try to keep the oceans clean, because of human interference and unnatural occurrences, the Great Barrier Reef needs scientific help to adapt corals to new conditions for means of survival, putting pressure on the Australian government to save their ocean environment.
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Coral reefs are systems of large, underwater structures that are composed of the mineralized bodies of corals. These corals are a class of marine invertebrates known as Anthozoans, and belong to the phylum Cnidaria, and are thus related to sea anemone and jellyfish. Each individual coral animal is only a few millimeters in diameter, and a few centimeters in length. Due to their sessile nature, and their ability to reproduce asexually, they are able to construct, over many generations, massive colonies of genetically identical individuals. Additionally, they secrete a hard exoskeleton of calcium carbonate to support and protect their bodies, and it is from this process that the colony constructs what is known as a single coral “head.”
Coral reefs “form the foundation of all atolls are composed of the skeletons of marine animals which have become fastened onto a rocky substrate in shallow warm water, rich in the calcium used for construction of the skeletons. Most often this attachment is to the skeletons of preceding
The outer layer of a reef consists of living animals, or polyps, of coral. Single-celled algae called zooxanthellae live within the coral polyps, and a skeleton containing filamentous green algae surrounds them. The photosynthetic zooxanthellae and green algae transfer food energy directly to the coral polyps, while acquiring scarce nutrients from the coral. The numerous micro habitats of coral reefs and the high biological productivity support a great diversity of other life.
Coral, which is a sedentary coelenterate of warm and tropical seas, comes in two forms: either hard or soft. According to reefed.edu, soft corals are “soft bodies made up of a large number of polyps connected by a fleshy tissue.” Meanwhile, hard, or “stony,” corals consist of a solid, limestone skeleton. Hard and soft coral can also be easily distinguished by the number of tentacles a coral has. Soft corals have eight tentacles on each polyp, while hard corals have multiples of six tentacles per polyp (ReefED, “Hard Corals”). Hard corals are also able to come together to form the basis of coral reefs, while soft corals cannot build reefs (ReefED, “Soft Corals).
Corals are a type of animal called a polyp, the simplest of predators that eat meat in the form of drifting zooplankton…all corals have boarders, zillions of microscopic, one-celled plants called zooxanthellae that live inside the polyps and transform sunlight into oxygen, keeping the corals alive. As you will see, the corals need these algae in order to live, but too much is deadly.
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“Try not to become a man of success, but rather try to become a man of value” is how Albert Einstein defined success, so is that what it really means to be successful? Over time people in society have developed a view that celebrities and wealthy people are a true representation of success. But what truly defines a person of success? Merriam Webster states that success is a “favorable or desired outcome; also: the attainment of wealth, favor, or eminence.” Although most people admire this definition, success should really be defined as this: it cannot be achieved until witnessing failure and is not the same for each individual which encourages various definitions, and how success is reached through a journey filled with obstacles, not easily attained.
The true definition of success is the accomplishment of an aim or purpose. Although, many people have different perceptions of success. Success is judged by the individuals themselves. Success can be defined in many ways including: wealth, happiness, fame, etc. Success can be anything from material goods to concepts. It all depends on your concept and how you achieve your goals. You have to have persistence within yourself. Varying on your profession, you will need a certain skill level. Your definition of success can be suitable best for you, but not for others. It is about truly not giving up, reaching your full potential, and self-fulfillment.
Jainism is one of the oldest religions founded in India (“History of Jainism”). Jainism holds...
The main goal of PR is to affect individuals or groups to help organizations reach more successful by building relationships with them through organization’s activities. PR people’s functions and key tasks can be varied. In simple terms, the role of public relations in an organization is immense and wide scope and it can be divided into the following categories:
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