ipl-logo

Summary: The Evolution Of Non-Native Species

1370 Words6 Pages

Well-documented records of introduction for non-native species provide a remarkable opportunity to understand how populations evolve in a new environment. Commonly, species introduced into a new environment came from a few individuals, which is translated mostly in a low genetic diversity due to that they have just part of the genetic diversity of the original population (Frankham 2005; Roman and Darling 2007). Additionally, the process of random genetic drift as it is predicted by the genetic theory is stronger in small populations (Frankham 1996; Roman and Darling 2007). Like further consequence related to genetic drift during the process of introduction, frequently is followed by a strong selection by the new environment what can drive an …show more content…

Salmo trutta, S. salar, Oncorhynchus tshawytscha, O. kisutch, and O. mykiss; Basulto 2003; León-Muñoz et al. 2007; Soto et al. 2006), therefore Salmonids are useful models to address how species evolve in a new environment. In this context, Rainbow trout Oncorhynchus mykiss Walbaum, 1972 is one of the most introduced and successful freshwater species due to its economic value, its ease of culture, and importance to sport fishing (Casal 2006; Crawford and Muir 2008). In addition this species is listed in the 100 of the world’s worst invasive alien species (Lowe et al. 2000).The native distribution of rainbow trout is the northern hemisphere along the eastern and western Pacific Ocean from California through the Kamchatka Peninsula. This species has several life history forms, including fluvial, ad fluvial, and anadromous (steelhead), and is iteroparous, maturing at several ages including paar (Quinn 2005). This plasticity and economic value have resulted in the worldwide introductions and subsequent colonization of rainbow trout including rivers and lakes in Chilean …show more content…

Subsequent records were not well documented until the 1980s with the onset of the salmon aquaculture industry (Basulto 2003). Rainbow trout introduced in northern Patagonian had occurred in diverse Araucanian lakes where highlighted two contrasting lakes that can tell us different histories about how rainbow trout populations have evolve after their establishment, Lake Llanquihue and Lake Todos Los Santos (TLS). Differences among them are related mainly to farming pressure and nutrient production (Arismendi et al. 2009; Soto et al. 2006). Lake Llanquihue with an area of 870.5 Km2 is the most important producer of salmonid smolts for aquaculture in the country and the history of introductions occurred between 1910 and 1916 from a temporary rainbow trout hatchery at the outlet of Llanquihue (i.e. Maullin River) (Basulto 2003; León-Muñoz et al. 2007). This temporary hatchery was focused in stoked the lake Llanquihue and tributaries with individuals of rainbow trout brought from Germany (Basulto 2003). After the 1980s the lake Llanquihue became the second producer of rainbow trout smolts with an average of 5.1 million of fish produced between 1998 and 2005 (León-Muñoz et al. 2007). It had been suggested that the current free living population is a combination of earlies stocked and posteriorly individuals escaped

Show More
Related
614 Words | 3 Pages

In 2012, mean daily growth rates in terms of differences of fork length (weight) from March 28 to April 26 were: 0.278 mm/day (0.048 g/day), 0.408 mm/day (0.078 g/day), 0.255 mm/day (0.048 g/day), and 0.293 mm/day (0.048 g/day) at the Merced River Ranch, Robinson’s restoration reach, Gallo’s property, and Livingston’s scout camp, respectively. In 2013, mean daily growth rates in terms of differences of fork length (weight) from March 18 to April 15 were: 0.474 mm/day (0.074 g/day), 0.497 mm/day (0.077 g/day), and 0.204 mm/day (0.025 g/day) at the Merced River Ranch, Robinson’s restoration reach, and Gallo’s property, respectively (Figure 4). In 2011, mean daily growth rates of juvenile Chinook salmon inside enclosures were higher at

Read More
140 Words | 1 Pages

Lamprey Report During the 1950s lampreys became a problem. Lampreys were feeding on trout in the Great Lakes and by the late 1950s the population of the trout was very little. Fortunately, The Great Lakes Fishery Commission (GLFC), pursuant to the Convention on Great Lakes Fisheries, delivers sea lamprey control in partnership with the U.S. Fish and Wildlife Service, Fisheries and Oceans Canada, and the U.S. Army Corps of Engineers. The GLFC fixed this problem by, killing the larvae and eggs before the lampreys were born.

Read More
260 Words | 2 Pages

In reality, the brook trout is highly valued for its taste and size in many fishing industries. It’s population has gone through a steady decline throughout the years. The brook trout has suffered from habitat loss due to urban sprawl and clear-cutting forests, depriving it of its freshwater home. Let’s take a step to conserve wildlife for the future, preserving it for generations to

Read More
237 Words | 1 Pages

When salmon have matured, they return to the rivers to spawn. They usually return with uncanny precision to the natal river where they were born, and even to the very spawning ground of their

Read More
1291 Words | 6 Pages

INTRODUCTION In nature, there are many process that related to our ecology and genetic behaviour. It is important to learn and get a better understanding about the evolution process and how an organism react towards genetic stress. Biologists constantly assign to extrinsic situation, such as food and climate changes as the only potential cause of variation. Adaptation occur through changes in allele frequencies as a result of the selection pressure exerted by the environment.

Read More
367 Words | 2 Pages

Fish are cold blooded legless vertebrate that live in the water and breathe using their gills. Rainbow Trouts live in streams, rivers and generally cold water areas like the pacific ocean in Asia and North America. They are carnivores and have a healthy population meaning they aren 't endangered or at the risk of extinction because they have a big population but this also has a negative impact as they will be competitive in terms of their environment or food. Rainbow trout are known predators in their habitats but they are also prey for larger fish. Rainbow trouts are able to adapt to warm and cold water temperature as well as reproduce in warm or cold water temperature.

Read More
1865 Words | 8 Pages

In addition, vegetation is a factor because since species often rely on other species, the presence of the different vegetation

Read More
152 Words | 1 Pages

In the past few years the sport of bass fishing has gained popularity. With this popularity and spot light, the sport has acquired some controversy. Some fear that the sport will be surrounded by critics that will eventually cause an end to professional fishing. While critics claim the sport has poor conservation actions, professional bass fishing embrasses the correct treatment of the fish and their habitat. With having a huge industry and following, the sport would be very hard to bring to an end.

Read More
551 Words | 3 Pages

It’s not only the elusive marlin that graces Lanzarote with its presence during the summer months but schools of tuna who pass by the Spanish archipelago on their annual Atlantic

Read More
938 Words | 4 Pages

It tends to live in the North Eartern part of the US on colder streams and it's relater to the char. This actually makes it kind of a relative of the lake trout, but not quite a member of the same family. This fish is only found in very wilderness areas which makes it one of the favorite for trout anglers. In the places that is found you can be sure that the water is very clean and the ecology is as close as prestine as you can find it this days.

Read More
665 Words | 3 Pages

The introduction of Asian carp into the Great Lakes has had an adverse effect on native fish and could jeopardize the fishing industry, particularly lake perch and trout populations. The Asian carp eat many tiny plants and animals, which are food for many native fish. This will eventually affect the population and growth of the Great Lakes native fish. The Asian carp should be removed from the Great Lakes as shown in the following paragraphs.

Read More
774 Words | 4 Pages

My family processes approximately 4,000 pounds of salmon, kings, reds, silvers, etc. We start when the fish first come into the river, all the way to the very end. My family and I smoke, dry, and freeze the salmon. I brought you some canned salmon to share that we keep year round”, “The generations that are coming who can be fed from this resource and this land and it’s a beautiful interaction and it’s one that we are losing around the world. When we realize that we have lost it we strive to get it back, but it is taking a long time for this beautiful balance between human, animal and subsistence lifestyle to come about and evolve”, “The survival of our culture directly depends on the health of our land, the fish and the wildlife.

Read More
807 Words | 4 Pages

For thousands of years, people in the Pacific Northwest have depended on the annual migration of salmon. Salmon is a popular and healthy dish, and the commercial fishing industry is prominent there. However, recently, the population of salmon has drastically declined, mostly due to human-caused factors, including hydropower, habitat loss, harvesting habits and hatchery fish (Gore and Doerr, 2000, pp. 40-41). This decrease affects the ecosystems in which the salmon reside as well as puts the future of Pacific Salmon as both a species and a food source in danger.

Read More
894 Words | 4 Pages

Performance and impact of the salmon industry The production growth and the export of farmed salmon comes from Norway, Chile, and Scotland, they account for about 80% of the total production of farmed salmon. As seen in Figure 1 (see below) the production of certain species has been increasing over time, while the production of others has been decreasing even stopping completely for some, king salmon. After the stock market crash in 2008, the production of fish in Chile dropped substantially, from 630.647 tons to 486.712 tons (Salmonchile, 2017). Overall however the production of salmon has increasing drastically since the 1990s, to the point where in 2004 Chile was matching Norway’s salmon production.

Read More
1780 Words | 8 Pages

A fish survey will be additionally conducted within the study period and its associated tributaries to ascertain the extent of the current distribution of invasive species within the province from aforetime kenned prelude sites. The presence or absence of invasive species within a given river segment will be attested through genetic and morphological identification of sampled populations in a parallel perpetual study. Characterization of risk Invasion vulnerability The incursion susceptibility score (IVS) will be derived as the sum of all physical variables (minimum temperature), dam score and river flow (either perennial or episodic/ephemeral) for each given river section. The minimum possible IVS will be 3 and the maximum possible will be 7.

Read More

More about Summary: The Evolution Of Non-Native Species

Related Topics

Open Document