NDLI: Genetic structure of eelgrass (Zostera marina) within Humboldt Bay, California

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Genetic structure of eelgrass (Zostera marina) within Humboldt Bay, California

Content Provider	Semantic Scholar
Author	Baibak, Bethany
Copyright Year	2014
Abstract	Genetic structure and diversity of populations can impact the productivity and resilience of ecosystems. In Humboldt Bay, California (USA) eelgrass (Zostera marina) is the dominant marine plant at low intertidal and shallow subtidal elevations where it provides many ecological functions. However, its genetic makeup in Humboldt Bay has never been described. This study tested the hypotheses that eelgrass genetic diversity and structure differ across vertically and horizontally arranged subpopulations within Humboldt Bay. Ten microsatellite markers were examined for each of the 265 samples (i.e., shoots) collected across horizontal strata. The vertical subpopulations were located only in the North and South Bay portions of Humboldt Bay and included 165 samples from the mid intertidal (HIGH), low intertidal (LOW) and the shallow subtidal (SUB). The horizontal subpopulations included 32 samples from Mad River Slough (MRS), 93 from North Bay (HBN), 34 from Freshwater Slough (FWS), 34 from Elk River (ELK), and 72 from South Bay (HBS). AMOVA, Bayesian analyses, and Discriminant Analyses of Principle Components (DAPC) failed to reveal significant genetic structure among the horizontal or vertical populations. Global FST and overall RST values were close to zero implying that the subpopulations in both datasets share many alleles in similar frequency. Pairwise FST comparisons of MRS:ELK and MRS:HBS were slightly significant indicating that there are alleles that are not shared in equal frequency between these subpopulations. Although not statistically significant, some distinctive structure of ELK and MRS was observed in scatterplots in DAPC: this is consistent with their physical
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://humboldt-dspace.calstate.edu/bitstream/handle/10211.3/134615/Baibak%20BethanyTHESIS%2012_10_14%20Final.pdf;jsessionid=094CB01A88606AB6F98FCE6B18582A83.server1?sequence=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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