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Arroyo Seco

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The Arroyo Seco is located in Los Angeles County, California, it has wonderful variety of native species which including plants and animals. All these species are categorized to producer, lower level consumer, upper level consumer and decomposer, such as: Producers- Arroyo Willow, Alder, Beavertail cactus, Cottonwood and other. Lowel Level Consumers- Cochineal, Mourning Dove, Scrub Jay, wood rat and etcetera. Upper level consumer- Cliff swallow, Black Widow Spider, Cooper’s Hawk and other. Decomposer- Bracket fungus, Pill bug, Toadstool and etcetera. They are the key species and community in The Arroyo Seco’s ecosystem. Accordingly, The Arroyo Seco is in a Chaparral biome which is dominated by evergreen shrubs and majority plant species in …show more content…

Our team has decided on the two producer species, they are Arroyo Willow (Salix lasiolepis - Benth) (NatureServe, 2015) from the Native community and Mexican Fan Palm (Washingtonia Robusta)(U.S. National Plant Germplasm System 2010) from Non-Native community. The decision of our selected species is basis on their species category, kingdom, characteristic and habitat. They are relatively similar because their preference living of Riparian zone, belong to plante kingdom, Angiosperm, size at least 10 to 15 meters tall and the need moist soil to develop. In the measurement of density-dependent limiting factors, population size of Arroyo Willow (Salix lasiolepis - Benth) (NatureServe, 2015) should be decreasing because the competition of food, water and living space with Mexican Fan Palm (Washingtonia Robusta)(U.S. National Plant Germplasm System 2010). Based on the studies, our hypothesis is Population of Mexican Fan Palm (Washingtonia Robusta)(U.S. National Plant Germplasm System 2010) is highly affecting the biodiversity in The Arroyo Seco, especially to the population of Arroyo Willow (Salix lasiolepis - Benth) (NatureServe, 2015) because of the same habitat and requirement of

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