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Wildlife of San Juan Creek
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Wildlife of San Juan Creek : ウィキペディア英語版
Wildlife of San Juan Creek
:''Main article: San Juan Creek''
San Juan Creek is a coastal stream in Orange County and Riverside County in the U.S. state of California. The creek drains of rugged and partially developed terrain. Because of its lower level of urbanization than many other Orange County streams, the creek supports a large amount of wildlife. Despite that, of the of rich wetland found in the San Juan Creek watershed, only 0.3 percent remain.
==Vegetation communities==
There are sixteen prominent vegetation zones in the San Juan watershed, which include riparian vegetation, sparse woodlands, coastal sage scrub and chaparral. Riparian vegetation is found along the banks of most free-flowing streams in the watershed with a measurable flow for at least part of the year. These include most of San Juan Creek, upper Trabuco Creek, Cañada Gobernadora, Bell Canyon, and most upper tributaries to San Juan Creek, as well as scattered patches along Oso and El Horno creeks. Woodlands are also more prominent in the upper watershed, and also typically occurs in close proximity to waterways. Coastal sage scrub is found on hillsides generally facing south, while chaparral is found at higher-elevation hillsides and mesas. There are also rock outcroppings, freshwater pools, and exotic plant communities within the San Juan watershed, but those are not included in primary plant communities, in part due to their small number. However, exotic plant species, such as giant reed, castor bean, and tobacco tree, are rapidly spreading and have yet to be eradicated. Giant reed is continually responsible for wiping out vast swathes of wetlands, swamps and riparian patches along the creek, although there remains much space where these habitats once thrived.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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