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Ecological role of seagrasses
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These two studies investigated the role of coastal habitats and ecosystems in relation to their productivity at the primary and secondary levels, as well as how these ecosystems are capable of shaping the dynamics of neighboring systems. The study conducted by Heck focused exclusively on seagrass ecosystems and their interconnectedness with nearby and distant habitats. The researchers investigated biomass exchanges that occur through both passive and active means. Consumers accomplish active transport as they directly transport biomass into and out of seagrass meadows. Passive transport of seagrass biomass is associated with roots, rhizomes and seagrass detritus that’s is carried out of the system by currents and waves. Therefore, the review conducted by Heck primarily focused on the role of primary production within seagrass ecosystesms. The decline of seagrass habitats is predicted to not only have effects upon the organisms that directly dwell in and feed off of them, but will also have far reaching effects on adjacent and distant habitats that they contribute to in the form of energy and biomass transfers. In contrast, the study conducted by Wong and her team, looked at a number of different types of estuarine coastal habitats and evaluated them based on their secondary production, in relation to their ability to contribute and sustain ecosystems. Ultimately, the researchers determined the values of these habitats based on their secondary production, and hope that their findings will help to direct restoration efforts in the future to protect those habitats with higher value based on ecological metrics.
According to the research presented by Heck, seagrass ecosystems are complex habitats that consist of both marine and terre...
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... coastal ecosystems and even distant marine food webs, due to their ability to interact with and exchange biomass and energy. Whether it be primary or secondary production that plays the more vital role is still up for debate. It is clear that that increasing stress from human activities will inevitably have far reaching effects on the linkages that exist between the various habitats discussed. More studies are needed to provide quality quantitative data at other sites around the globe especially those that have not yet been studied. It is also necessary to determine the extent and importance that the numerous habitats evaluated in Wong’s study currently have on neighboring as well as distant ecosystems for which they may have valuable connections with. This data could provide important insights that could then be better compared to the research presented by Heck.
Purpose: The purpose of this lab is to investigate the various components of different ecosystems in a smaller representation and study the conditions required for the ecosystem’s sustainability as well as the connections between
salt marsh habitats. Once a marsh has built up to such a level that it
In conducting my research, I observed activity on a rocky shore off the coast of Washington in the Northwest United States (workbook). This environment inhabits 10 species in shallow water nearly on top of each other. Each species helps form a complicated ecosystem where species protect, consume, and compete for space with other species. Out of the 10 species there are three producers, three sessile consumers (otherwise known as filter feeders), and four mobile consumers- one of which is an invasive species. In this environment the producers are Nori Seaweed (Porphyra), Black Pine (Neorhodomela), and Coral Weed (Corallina). Producers make their own food through sunlight, so only have predators and competition for space. Coral Weed is the strongest
The Chesapeake Bay is the nation’s largest estuary with six major tributaries, the James, the Potomac, the Susquehanna, the Patuxent, the York, and the Rappahannock Rivers, feeding into the bay from various locations in Maryland, Virginia, Pennsylvania, and the District of Columbia (Chemical Contaminants in the Chesapeake Bay – Workshop Discussion 1). These areas depend on the Bay as both an environmental and an economic resource. Throughout the last 15 years the Chesapeake Bay has suffered from elevated levels of pollution. Nitrogen and phosphorous from wastewater treatment plants, farmland, air pollution, and development all lead to reduced water clarity and lowered oxygen levels, which harm fish, crabs, oysters and underwater grasses (Key Commission Issues 1). There are other types of pollution in the bay such as toxic chemicals, but because nutrient pollution is the most significant and most widespread in the Bay its effects are the most harmful to fisheries. Nitrogen and phosphorous fuel algal blooms which cloud the water and block sunlight from reaching underwater grass beds that provide food and habitat for waterfowl, juvenile fish, blue crabs, and other species (Blankenship 11-12). Algae plays a vital role in the food chain by providing food for small fish and oysters. However, when there is an overabundance of algae it dies, sinks to the bottom of the Bay, and decomposes in such a manner that depletes the oxygen levels of the Bay (11). The reduced oxygen levels in the Bay reduce the carrying capacity of the environment and these “dead areas” sometimes kill off species that can not migrate to other areas of the Bay, such as oysters (11). Increased abundance of algal blooms also led to the overabundance of harmful and toxic algae species and microbes such as the microbe Pfiesteria, which was responsible in 1997 for eating fish alive and making dozens of people sick (12). The heightened awareness of diseases that can be contracted through consumption of contaminated fish also has an economic impact. Therefore, the excess levels of nitrogen and phosphorous have fueled an overabundance of algal blooms, which has reduced water clarity and lowered oxygen levels, affecting many species within the bay and ultimately the industries that rely on these species.
...uring the age of discovery, it is that environments and ecosystems are fragile and can be easily altered with devastating results. Therefore, as humans continue to discover exciting new worlds, either in the darkest depths of the ocean or on the surface of a strange new planet, it is important that we as humans consider the ecological impacts that may result from those discoveries.
One of the Bays biggest resources is its oysters. Oysters are filter feeders which mean they feed on agley and clean the water. The oysters feed on agley and other pollutants in the bay turning them into food for them, then they condense the food down to nutrient and developed things like pearls.Filtering the water also helps the oyster to grow. One oyster can filter 50 gallons of water a day, Oysters used to be able to filter the Bay in about a week. However these creatures are now scarce in the bay. The Chesapeake Bays Oyster (crassostrea virginica) Population has declined severely because of over harvesting, agricultural runoff, and disease. Now the Chesapeake Bay is becoming polluted without the oysters and the water is not nearly as clean as it once was. The Chesapeake Bay was the first estuary in the nation to be targeted for restoration as an integrated watershed and ecosystem. (Chesapeake Bay Program n/d). This report will show the cause and effect of the Chesapeake Bay's Oyster decline on the Bay.
Firstly, we need to gain a general understanding of the structure and functions of the salt marshes in Jamaica Bay. Salt marshes are most commonly manifested through the arrival of seeding’s of the cord grass known as Spartina alterniflora. The grass spreads asexually through the aquatic habitats beneath the earths’ surface. The grass becomes...
At the Aquarium of the Pacific, many different oceanic habitats are presented. These exhibits give the public an idea of the different environments our own oceans hold, providing a hands-on learning experience in the comfort of their own city. The two habitats that interested me are the coral reef and deep ocean. Both the coral reef and deep ocean are very different from each other, having varied ways of survival for the plethora of plants and animals that call those places home.
Change in water temperature changes the places where grasses are able to grow, when fish and crab feed, reproduce, and migrate ("Chesapeake Bay Program"). The temperature in the bay goes from high in the summer to very low in the winter. During summer, the surface water is warmer than the deeper water which creates two different temperature layers that actually separate surface waters from deeper waters (“Chesapeake Bay Program”). The temperature layers change th...
This paper introduces the environmental concerns of the loss of coastal wetlands. The paper will discuss the significance of wetlands and the devastation that is occurring because of human activity. Wetlands are an essential element of our environment both ecological and societal; conservation will be essential for the preservation of these precious ecosystems.
Oceans are such so vast that people underestimate the impact their actions —seeming so insignificant— have on them. Humans have by and large taken the oceans for granted; not considering how important a healthy ocean is to our survival. A popular mind-set is that the oceans are a bottomless supply of fish, natural resources, and an infinite waste dump. There are myriad reasons why the oceans should be saved and the most obvious one is marine life. With 71% of the Earth being covered by water, it is obvious that sea creatures are predominant form of life, making up 80% of the species of life on Earth. However, as important as marine life is, that is not the only reason why saving the oceans is crucial. The ocean floor provides natural resources such as, oil, natural gas, petroleum, minerals, medications, and ingredients for foods and products. The economic benefits of the oceans are huge and significant, as well. Fishing and fish products have provided employment to 38 million people and have generated about $124 billion in economic benefits. However, oceans are on the verge of crisis, marine life, natural resources, transportation, the economy, and important ingredients are at risk due to overfishing, pollution, and acidification. Thus, in this essay I will argue that, oceans are not impervious to human activity and threatening the health of the ocean threatens the health of humanity, since oceans key to our survival.
Coral reefs are well known for their colorful array of marvelous sights including a parade of exotic flora and fauna. They are said to be the foundation for a quarter of marine species, and are a crucial support for human life as well. The coral reef ecosystem is a diverse collection of species (ranging from microscopic to larger-than-life in size) that interact with each other and their physical environment. If any piece of a coral reef is harmed or removed the entire community can be seriously affected, even to the point of collapse. Unfortunately, human impact has resulted in long-term stresses that, unlike the short-term stress of natural disasters, coral reefs are not as capable to recover from. “Approximately half of the world’s coral reef ecosystem resources are considered by scientists to be in 'poor' or 'fair' condition and have declined over time due to several anthropogenic threats” (“Status of Corals” par. 2). Through poorly administered commercial practices, carelessness and ignorance among the common people, and human aggravated natural processes coral reef destruction has become a serious issue afflicting the world’s biodiversity and it’s intricate biosphere mechanics (“Human Impact on the Great Barrier Reef” 1) (“What Are Coral Reefs?” 1).
These results agree with the hypothesis that our “untouched and super-productive world” is affecting marine life ecosystems (Vannela, 2012). All of these results combined confirm the overall hypothesis that pollution is getting worse in the ocean and more marine life ecosystems are being affected, but there
...Dennison, W. C., Duarte, C. M., Fourqurean, J. W., Heck, K. L., & Williams, S. L. (2006). A global crisis for seagrass ecosystems.Bioscience, 56(12), 987-996.
...s are considered as part of a larger watershed, the recognization of the complexity of environmental stresses can be understood. Management plans can be developed to reduce impacts to mangroves, seagrasses and the reef ecosystem, based upon accurate data and a better understanding of the system. EPA is in the process of developing guidance for a watershed approach to coral ecosystem protection.