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California State Polytechnic University – Pomona

1. Fales, Robin. Distribution, local extinctions, long-term change, community dynamics and demography of Pelvetiopsis californica (Phaeophyceae, Fucales).

Degree: MS, Department of Biological Sciences, 2019, California State Polytechnic University – Pomona

Rockweeds (Phaeophyceae, Fucales) can dominate rocky intertidal habitats in temperate ecosystems and are considered ecosystem engineers, supporting a diversity of flora and fauna that find refuge from desiccation stress underneath the rockweed canopy. Pelvetiopsis californica is an upper rocky intertidal rockweed ranging from Punta Eugenia, Baja to Monterey Bay, CA yet little is known about its distribution and abundance within its range, nor its demographics or ecology. Therefore, I: 1) determined the current distribution of P. californica across the U.S. portion of its range; 2) compared the historical distribution to the current distribution to determine temporal change; 3) examined within and between site differences in community structure of macroalgae and macroinvertebrates with and without P. californica to determine its role as a habitat former; 4) assessed biotic and abiotic factors that influence its distribution, and; 5) assessed growth, survival, and reproduction of a single P. californica population. To assess the current distribution of P. californica, I surveyed 46 sites along the rockweed???s U.S. range, with additional data for 40 supplemental sites obtained from colleagues. The current distribution was compared to historical presence of P. californica determined from herbarium specimens, unpublished data, and published literature. At each of my 46 sites, I surveyed the community composition of the high intertidal zone in a typical P. californica habitat with sites then categorized by a suite of site abiotic conditions (e.g. wave exposure, temperature, etc.) and biotic parameters (e.g. presence of other rockweeds, human impacts) to determine their role in driving distributional patterns. To assess differences in community structure on a local scale, I performed targeted community surveys in Newport Beach, southern CA. At the same site, fixed P. californica plots were monitored monthly for recruitment, survival, reproductive timing, and growth. P. californica exhibits a patchy distribution, particularly in southern CA where it was absent along large stretches of coastline with seemingly suitable habitat. Comparisons with historical records found 11 localized extinctions (30% of 36 sites), with regional extirpations in Palos Verdes and San Diego. Even at relatively low levels of cover, P. californica had an impact on high zone community composition but the relative effect varied spatially due to aerial temperature. The drivers of the patchy distribution of P. californica and observed local/regional extinctions are still unclear but may be attributable to a combination of stressors that differ by region or site. There is some evidence that temperature, and possibly climatic warming, may be a large driver, given aerial temperature was closely linked with its distribution and regional extinctions were observed in warmer water; however, the patterns were not entirely consistent. Due to limited reproductive dispersal distances and fragmented populations with no connectivity, P. californica is likely to… Advisors/Committee Members: Smith, Jayson (advisor), Claisse, Jeremy (committee member).

Subjects/Keywords: California

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Fales, R. (2019). Distribution, local extinctions, long-term change, community dynamics and demography of Pelvetiopsis californica (Phaeophyceae, Fucales). (Masters Thesis). California State Polytechnic University – Pomona. Retrieved from http://hdl.handle.net/10211.3/212209

Chicago Manual of Style (16th Edition):

Fales, Robin. “Distribution, local extinctions, long-term change, community dynamics and demography of Pelvetiopsis californica (Phaeophyceae, Fucales).” 2019. Masters Thesis, California State Polytechnic University – Pomona. Accessed August 24, 2019. http://hdl.handle.net/10211.3/212209.

MLA Handbook (7th Edition):

Fales, Robin. “Distribution, local extinctions, long-term change, community dynamics and demography of Pelvetiopsis californica (Phaeophyceae, Fucales).” 2019. Web. 24 Aug 2019.

Vancouver:

Fales R. Distribution, local extinctions, long-term change, community dynamics and demography of Pelvetiopsis californica (Phaeophyceae, Fucales). [Internet] [Masters thesis]. California State Polytechnic University – Pomona; 2019. [cited 2019 Aug 24]. Available from: http://hdl.handle.net/10211.3/212209.

Council of Science Editors:

Fales R. Distribution, local extinctions, long-term change, community dynamics and demography of Pelvetiopsis californica (Phaeophyceae, Fucales). [Masters Thesis]. California State Polytechnic University – Pomona; 2019. Available from: http://hdl.handle.net/10211.3/212209

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