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During the summer of 2017 we performed a field experiment in the Kiamichi River testing the effects of mussels on two food web compartments - fish and macroinvertebrates. This experiment was designed and carried out by graduate students Hopper (KSU) and DuBose (OU). Specifically, we asked: Do mussels alter the distribution of fish within a stream reach and do mussels out-compete co-occurring filter-feeding macroinvertebrates. Fifty enclosures (50 cm x 50 cm x 20 cm) were buried in the stream. Mussels were unable to leave the enclosures but invertebrates and fish could move freely within and among enclosures. We manipulated the relative abundance of two mussel species, Actinonaias ligamentina and Amblema plicata. The two species differ in phylogeny, morphological and behavioral characteristics that influence their functional role in ecosystems. We used ‘sham’ mussels (shells filled with sand) in identical abundance combinations and a no-mussel control (sediment alone), with each treatment replicated 10 times (n = 50). This design allowed us to separate the effects of live mussel communities dominated by species with different physiological and morphological traits (Actinonaias dominated community versus Amblema dominated community) from the physical shells and sediment alone. The enclosures were sampled at monthly intervals for three months. We used remote underwater video (RUV) to quantify fish abundance across different treatments and to test if their distribution tracked trophic resources we quantified benthic invertebrate biomass, benthic algae biomass, and benthic organic matter. Resource subsidies were sampled and RUV data collection was conducted at week 9 and week 12. The results of the experiment are published in Hopper et al., Freshwater Science, 2019, and the data are archived here. Another manuscript from this project is currently in review; those data will be archived here once the manuscript is accepted.
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