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首页> 外文期刊>Marine Biology: International Journal on Life in Oceans and Coastal Waters >Long-term change in a high-intertidal rockweed {Pelvetiopsis californica) and community-level consequences
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Long-term change in a high-intertidal rockweed {Pelvetiopsis californica) and community-level consequences

机译：Long-term change in a high-intertidal rockweed {Pelvetiopsis californica) and community-level consequences

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摘要

Rockweeds can dominate temperate rocky intertidal habitats and support a diversity of flora and fauna that find refuge underneath the canopy-forming seaweed. Pelvetiopsis californica is an upper intertidal rockweed endemic to California (USA) and Baja California (MEX) with little known about its distribution and abundance, nor its ecological role as a habitat former. We examined long-term changes in the abundance and distribution of P. californica and its effects on the upper shore community, along the coast of California. Similar to patterns observed in other rockweeds globally, P. californica has declined over the past several decades, including extirpation at 30% of sites sampled, clustered around urban centers of southern California, and a large decline in abundance at most sites from a long-term (similar to 20 + years) monitoring program. Currently, P. californica exhibits a patchy distribution, particularly in southern California where it is absent from long stretches of shoreline. In community surveys across a large geographic scale (32 degrees-36 degrees latitude), high zone community composition was significantly different at sites where P. californica was present, even at relatively low cover, than when the alga was absent. Within-site community surveys also showed that communities associated with P. californica were different than when the rockweed was absent, highlighted by a higher diversity of algae and invertebrates. Probable stressors, such as trampling and climate change, are likely to worsen in the future, further reducing P. californica populations. Due to limited reproductive dispersal capabilities and fragmented populations, natural recovery seems unlikely and active restoration may be necessary.

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