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**Aim 1: A global census of microbial eukaryotes found in association with leaves, roots, and sediment of the seagrass Zostera marina.**  The goal of Aim 1 is to investigate the global diversity of microbial eukaryotes found in _Z. marina_ beds. As part of this investigation wee we  seek to answer the following questions: Can we detect a phylogeographic signal of _Zostera marina_-associated microeukaryotes? What is driving microbial eukaryotic community compositions in _Z. marina_ beds, the prescence of _Z. marina_ (host plant) or environmental factors (geography, pH, temperature, etc)? Or is everything everywhere? Do we specific patterns in either richness or diversity in these beds and do any of these patterns mimic those of macro-organisms known to frequent _Z. marina_ beds? **Aim 2: A global census of microbial eukaryotes found in association with leaves, roots, and sediment of the Order Alismatales, which includes three, independent lineages of seagrasses**