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Reintroducing Threeridge Mussels (Amblema plicata) to the Cedar River: Effects of Propagation on Population Genetics and Effects of Environmental Variables on Juvenile Growth.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Reintroducing Threeridge Mussels (Amblema plicata) to the Cedar River: Effects of Propagation on Population Genetics and Effects of Environmental Variables on Juvenile Growth./
Author:	Miller, Katelyn.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
Description:	102 p.
Notes:	Source: Masters Abstracts International, Volume: 83-12.
Contained By:	Masters Abstracts International83-12.
Subject:	Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29161126
ISBN:	9798819396452

Reintroducing Threeridge Mussels (Amblema plicata) to the Cedar River: Effects of Propagation on Population Genetics and Effects of Environmental Variables on Juvenile Growth.
Miller, Katelyn.

Reintroducing Threeridge Mussels (Amblema plicata) to the Cedar River: Effects of Propagation on Population Genetics and Effects of Environmental Variables on Juvenile Growth. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 102 p.

Source: Masters Abstracts International, Volume: 83-12.

Thesis (M.S.)--Iowa State University, 2022.

This item must not be sold to any third party vendors.

Propagation and reintroduction have been commonly used tools to help restore freshwater mussels (Bivalvia: Unionoida). Many questions remain unanswered regarding the impacts of propagation and reintroduction on the population genetics of species, and the impacts of habitat on the success of propagation and reintroduction. Three gravid females were collected from a population of Threeridge (Amblema plicata) mussels and used to propagate a population of juveniles. Genetic samples were taken from the source population, the juveniles directly after transformation from glochidia (larvae), and the juveniles after a year of growth in the hatchery. All three sample sets were significantly differentiated, indicating released juveniles were not representative of the source population and that mortality in the hatchery altered the genetic variability of the juveniles. Multiple paternity was detected, with samples of three different maternal broods of 56, 19, and 14 juveniles being fertilized by 33, 15, and 10 sires, respectively, increasing genetic variability in the cohort. After a year in the hatchery, extensive mortality was found to be non-random, with 94% of the surviving juveniles having been produced from only one dam. In this experiment, three dams initially produced a juvenile population with similar genetic variability to the source population, but juvenile genetic variability was reduced significantly through nonrandom mortality in the hatchery. After the first year in the hatchery, juveniles were placed at four sites in rivers in mussel silos (enclosures). Juvenile growth was measured biweekly along with physical environmental conditions, water chemistry, and measures of organic matter availability over two open-water seasons. Juvenile growth was found to be strongly positively influenced by daily minimum water temperature and turbidity. Turbidity was the most explanatory food-indicating variable in this experiment, likely due to its positive correlation with sediment accumulation, allowing mussels to pedal feed. Chlorophyll a and total nitrogen were found to have the strongest negative impacts on growth. Phytoplankton blooms likely inhibited growth. Further research is needed to study the mechanisms of phytoplankton blooms and total nitrogen inhibiting mussel growth. After the two open-water seasons of data collection, juvenile mussels were tagged with uniquely numbered shellfish tags and passive integrated transponders, released into substrate in one site on the Cedar River in Iowa, and their growth and survival will continue to be monitored.

ISBN: 9798819396452Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Amblema plicata

Reintroducing Threeridge Mussels (Amblema plicata) to the Cedar River: Effects of Propagation on Population Genetics and Effects of Environmental Variables on Juvenile Growth.
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520 $a Propagation and reintroduction have been commonly used tools to help restore freshwater mussels (Bivalvia: Unionoida). Many questions remain unanswered regarding the impacts of propagation and reintroduction on the population genetics of species, and the impacts of habitat on the success of propagation and reintroduction. Three gravid females were collected from a population of Threeridge (Amblema plicata) mussels and used to propagate a population of juveniles. Genetic samples were taken from the source population, the juveniles directly after transformation from glochidia (larvae), and the juveniles after a year of growth in the hatchery. All three sample sets were significantly differentiated, indicating released juveniles were not representative of the source population and that mortality in the hatchery altered the genetic variability of the juveniles. Multiple paternity was detected, with samples of three different maternal broods of 56, 19, and 14 juveniles being fertilized by 33, 15, and 10 sires, respectively, increasing genetic variability in the cohort. After a year in the hatchery, extensive mortality was found to be non-random, with 94% of the surviving juveniles having been produced from only one dam. In this experiment, three dams initially produced a juvenile population with similar genetic variability to the source population, but juvenile genetic variability was reduced significantly through nonrandom mortality in the hatchery. After the first year in the hatchery, juveniles were placed at four sites in rivers in mussel silos (enclosures). Juvenile growth was measured biweekly along with physical environmental conditions, water chemistry, and measures of organic matter availability over two open-water seasons. Juvenile growth was found to be strongly positively influenced by daily minimum water temperature and turbidity. Turbidity was the most explanatory food-indicating variable in this experiment, likely due to its positive correlation with sediment accumulation, allowing mussels to pedal feed. Chlorophyll a and total nitrogen were found to have the strongest negative impacts on growth. Phytoplankton blooms likely inhibited growth. Further research is needed to study the mechanisms of phytoplankton blooms and total nitrogen inhibiting mussel growth. After the two open-water seasons of data collection, juvenile mussels were tagged with uniquely numbered shellfish tags and passive integrated transponders, released into substrate in one site on the Cedar River in Iowa, and their growth and survival will continue to be monitored.
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