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4 results for “Nereocystis luetkeana”
Nereocystis luetkeana microsatellite data (Genepop format)
<p>In temperate regions, one of the most critical determinants of present range-wide genetic diversity was the Pleistocene climate oscillations, the most recent one created by the last glacial maximum (LGM). This study aimed to describe <em>Nereocystis luetkeana</em> genetic structure across its entire range (Alaska to California) and test different models of population connectivity within the Salish Sea. This region was colonized after the LGM and has been under increased disturbance in recent decades. We utilized microsatellite markers to study <em>N. luetkeana</em> genetic diversity at 53 sites across its range. Using higher sampling density in the Salish Sea, we employed a seascape genetics approach and tested isolation by hydrodynamic transport and environment models. At the species distribution scale, we found four main groups of genetic co-ancestry, Alaska; Washington with Vancouver Island's outer coast and Juan de Fuca Strait; Washington's inner Salish Sea; and Oregon with California. The highest allelic richness (AR) levels were found in California, near the trailing range edge, although AR was also high in Alaska. The inner Salish Sea region had the poorest diversity across the species distribution. Nevertheless, a pattern of isolation by hydrodynamic transport and environment was supported in this region. The levels of allelic richness and genetic differentiation suggest that during the LGM, bull kelp had both northern and southern glacial refugia in Haida Gwaii and Central California, respectively. Genetic diversity in Northern California sites seems resilient to recent disturbances, whereas the low levels of genetic diversity in the inner Salish Sea are concerning.</p>
Scaling and structural properties of juvenile bull kelp (Nereocystis luetkeana) Data
<p>Bull kelp (<i>Nereocystis luetkeana</i>), the only canopy-forming kelp in the Salish Sea, provides primary production in the nearshore subtidal environment and serves as important habitat for economically and ecologically important species. An annual species, each year juvenile bull kelp sporophytes must grow from the hydrodynamically more benign benthos to the water column, where they experience substantial drag at the surface. Because of the differences in morphology and ecology across life stages, and the fact that previous work has focused mainly on adult bull kelp, we tested whether morphology and structural properties change with stipe length, investigating scaling of both juvenile (stipe length <40 cm) and mature (stipe length > 40cm) kelp, and testing how juvenile stipes fail. Juvenile bull kelp grow proportionally (isometric growth) when young, but lengthen more quickly than would be predicted by bulb size (negative allometry) at maturity. Based on our data, the predicted breakpoint between isometric and allometric growth occurred at about 33 cm, likely ~ one to two weeks of growth. Cross sectional area of the stipe, Force to failure, Work to failure, and stiffness (Young's Modulus) all grow more slowly than would be predicted based on length, while Maximum Stress and Toughness increase more quickly than predicted. There is no change in extensibility over the size range we tested, suggesting that this material property does not change with stipe length. The differences in biomechanics between juvenile and adult kelp are likely a response to the varied hydrodynamic environments experienced during the annual lifecycle, which highlights the importance of studying organisms across life stages.</p>
Nereocystis luetkeana microsatellite data (Genepop format)
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Scaling and structural properties of juvenile bull kelp (Nereocystis luetkeana) Data
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