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Between 2005 and 2008, size-frequency distributions from 22 populations of the inter- tidal snail Chlorostoma (Tegula) funebralis were studied to determine the effects of latitudinal region and coastal topography. Upwelling, which may affect larval recruitment, varies along a latitudinal gradient, while coastal topography may mitigate the effects of latitude. Sites were categorized by lat- itude: Northern (Oregon, 15 sites), and Southern (California, 5 sites; Baja California, 2 sites); and by coastal topography: protected (bays and coves, 7 sites in north, 3 in south), or exposed to the open ocean (7 sites in north, 5 sites in south). In Oregon, population structures at protected and exposed sites were significantly different (p = 0.001). At protected sites, a large percentage of individuals were pre-reproductive juveniles. At exposed sites, the population was weighted towards large indi- viduals capable of high reproductive output with few juveniles present in the population. This pat- tern may reflect inter-annual variation in recruitment in Oregon, with protected areas experiencing more constant recruitment. In California and Baja California all populations were predominately composed of juveniles, regardless of coastal topography (p = 0.336). Differences in age-structure of the population create significant differences in relative reproductive potential. The potential repro- ductive output of a population was calculated by quantifying the eggs produced by snails covering the size range of reproductive individuals. Populations in the north at exposed sites produce eggs at a rate up to 2 orders of magnitude higher than populations in the south (p = 0.004). These variations in size-structure of C. funebralis populations with coastal topography and latitude may have impor- tant impacts for the population distribution.

Latitude and coastline shape correlate with age-structure of Chlorostoma (Tegula) funebralis populations