Research - toddamacker

Pictured at right is the rostrum, or 'paddle', of a juvenile Paddlefish (Polyodon spathula). A network of sensitive electroreceptors helps Paddlefish to detect plankton in large river systems, and can even detect the individual feeding and swimming movements of zooplankton's microscopic appendages.

Graduate Research

    As a master’s student in the Alford Lab at the University of Tennessee, I became interested in the ecology and management of freshwater fishes of the American Southeast. I was particularly fascinated with two groups of fishes native to eastern Tennessee: small, colorful non-game fishes known as darters (Percidae), and large, ancient fishes including Lake Sturgeon and Paddlefish (Acipenseridae).

    For my own research, I investigated the diet of and prey availability for reintroduced juvenile Lake Sturgeon (Acipenser fulvescens) in the Upper Tennessee River Basin. With Lake Sturgeon having been extirpated in the entire Southeast by 1970, due to compounding anthropogenic influences, these fish are now being reintroduced by state, federal, and non-profit entities. Because these fish disappeared before scientists had a chance to study them, researchers are now investigating aspects of their life history for the first time in the Southeast. Larger, more robust populations in the northern U.S. and eastern Canada are well-studied and benefited from earlier conservation measures, so it’s imperative that aquatic biologists in the Southeast use sound science to advance the reintroduction of this imperiled species to its historic range.

    As a graduate student I partnered with the Tennessee Aquarium Conservation Institute (TNACI) to create an online reporting system whereby recreational anglers can inform biologists about when and where they caught their Lake Sturgeon. As this species is threatened or endangered in all but one state in the United States, anglers are requested to immediately release the fish after quickly photographing and estimating the size and weight of the fish. For more information on freshwater fish diversity in the Southeast, where aquatic diversity reaches its peak in the temperate world, please visit TNACI’s website. To learn more about iCaughtOne!, the Southeast’s Lake Sturgeon reporting system, visit icaughtone.org.


Current Interests

As a non-game fisheries biologist I am interested in the ecology, taxonomy, and distribution of freshwater fishes and mollusks in the American Southeast. Along with my fellow researchers, I have collected voucher specimens of fish and mollusks across the state of Tennessee for the Etnier Ichthyological Collection and the Paul W. Parmalee Malacological Collection respectively, both housed at the University of Tennessee-Knoxville.

I am also active in monitoring threatened and endangered fishes in the Tennessee River Valley, namely the Bluemask Darter (Etheostoma akatulo), the Sickle Darter (Percina williamsi), and the Tuxedo Darter (Etheostoma lemniscatum).

Most recently I have become involved with the conservation of freshwater mussels in the Tennessee River Valley. I have taken part in both qualitative and quantitative surveys in the Hiwassee, Clinch, Nolichucky, Duck, Buffalo, and Elk Rivers. I have also translocated targeted species from robust extant populations to rivers where certain species have seen precipitous declines or complete extirpation.

Currently I am working with Gerald Dinkins, Curator of Malacology at UT-Knoxville's McClung Museum of Natural History and Culture, to create a poster entitled "The Extinct Freshwater Mussels of the American Southeast".

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