Margariscus margarita have interactions with a variety of different species. As an omnivore (Encyclopedia of life, 2013), Margariscus margarita consumes a variety of food sources in their diet, which includes plants and animals. Margariscus margarita are a predator to animals such as beetles, copepods, mayflies, fingernail clams, water fleas (pictured on right), chironomids and other fly species (Goldstein, Harper, & Edwards, 2000; Stauffer, 2001). 




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However, while Margariscus margarita are a predator of some species, they are prey for others. Species that prey on Margariscus margarita include birds such as the belted kingfisher, cormorants, the great blue heron (pictured on left), loons, and ducks. In ponds and streams, it is usual for animals like bullfrogs, snakes, and turtles to eat Margariscus margarita. Surprisingly, even some insects dine on the small-sized Margariscus margarita. These include giant water bugs, diving beetles, scorpions, and dragonfly larvae (Cunningham, 2006).

While the Margariscus margarita have a wide array of natural predators, larger fish species are not usually one of them. This is because Margariscus margarita tend to live in shallow environments in which there is not a natural occurrence of large predatory fish. However, this unnatural interaction between large fish and Margariscus margarita is becoming more common due to the introduction of fish such as pike, sunfish, and trout by human beings. The introduction of large predatory fish to environments of Margariscus margarita is threatening to their existence. Although Margariscus margarita are not considered an endangered species in the United States, they are specified as threatened and/or endangered in some states (Cunningham, 2006). 


Interaction with large predatory fish species is not the only interaction that threaten the Margariscus margarita population. Another danger to Margariscus margarita is destruction and restriction on beaver dams (as pictured below). Beaver activity is important to the Margariscus margarita species because they support a healthy habitat for Margariscus margarita. Beaver dams make breaks in streams and causes water to pool over vegetated areas. This ensures optimal living conditions for Margariscus margarita (Cunningham, 2006).


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