Donna Kashian, Anna Boegehold, Karim Alame, and Nick Johnson
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1 Donna Kashian, Anna Boegehold, Karim Alame, and Nick Johnson
2 Alter nutrient and phytoplankton dynamics Dreissenid may enhance cyanobacteria blooms through selective feeding Cyanobacteria can produce harmful toxins
3 Dreissenids can persist in lakes with cyanobacteria blooms Continuous exposure to Microcystis and toxins may physiologically impair mussels, potentially increasing the effectiveness of control methods
4 Are broadcast spawners Spawn from April-September May rely on phytoplankton cues for spawning Nutritious algae may stimulate while cyanobacteria could hinder reproduction
5 Determine the effects of cyanobacteria on dreissenid reproduction (spawning, fertilization, and sperm vitality)
6 - Mussels were collected from the Detroit River - Tested 13 cyanobacteria cultures (8 species) Anabaena flos-aquae Aphanizomenon flos-aquae Dolichospermum lemmermanii Gloeotrichia echinulata (2 cultures) Lyngbya woolei Microcystis aeruginosa (5 cultures) M. wesenbergii Planktothrix suspensa
7 Spawning Assessment: Individual mussels were placed into vials and 1 x 10-3 M 5-HT serotonin was added to induce spawning Fertilization Assessment: After inducing spawning, sperm and eggs were collected and placed in well plates. Fertilization was monitored microscopically and quantified Sperm Vitality: After inducing spawning, sperm was collected and placed in well plates where distance, velocity, and acceleration were quantified microscopically using image-tracking software
8 Control Aphanizomenon flos-aquae Fisher s Exact Test
9 Control Aphanizomenon flos-aquae Fisher s Exact Test; red circles = p<0.05
10 Cyanobacteria Control M. aeruginosa ZUR M. wese nbergii P. su sp ensa M. aeruginosa UTEX M. aeru ginosa LSC M. aeru ginosa LEMS M. aeru ginosa BQ 11 Lyn gbya Gloeotrich ia BQ Dolich osp ermu m Gloeotrich ia ASG V Ap hanizo me non An abaena % %Fertilized Eggs eggs T-test = p<0.05 Cyanobacteria Control
11 Cyanobacteria Control M. aeruginosa ZUR M. wese nbergii P. su sp ensa M. aeruginosa UTEX M. aeru ginosa LSC M. aeru ginosa LEMS M. aeru ginosa BQ 11 Lyn gbya Gloeotrich ia BQ Dolich osp ermu m Gloeotrich ia ASG V Ap hanizo me non An abaena % Fertilized eggs %Fertilized Eggs T-test = p<0.05
12 Cyanobacteria Control Microcystis ZUR M. Wesenbergii Microcystis UTEX Microcystis GLERL Gloeotrichia Microcystis LSC MANOVA w/ multivariate ANOVA; p<0.05 Aphanizomenon Dolichospermum Anabaena Distance Distance Sperm SpermTraveled (nm) (mm)
13 Cyanobacteria Control Microcystis ZUR M. Wesenbergii Microcystis UTEX Microcystis GLERL Microcystis LSC Gloeotrichia MANOVA w/ multivariate ANOVA; p<0.05 Aphanizomenon Dolichospermum Anabaena Distance Distance Sperm SpermTraveled (nm) (mm)
14 Cyanobacteria Control MANOVA w/ multivariate ANOVA; p<0.05 Microcystis ZUR M. Wesenbergii Microcystis UTEX Microcystis GLERL Microcystis LSC Gloeotrichia Dolichospermum Anabaena Aphanizomenon Sperm Acceleration (m/s 2 )
15 Cyanobacteria Control MANOVA w/ multivariate ANOVA; p<0.05 Microcystis ZUR M. Wesenbergii Microcystis UTEX Microcystis GLERL Microcystis LSC Gloeotrichia Dolichospermum Anabaena Aphanizomenon Sperm Acceleration (m/s 2 )
16 Fertilization 7 cultures have an effect Spawning Aphanizomenon flos-aquae inhibits at > mg/l chlor-a Sperm motility Distance and velocity impacted by Aphanizomenon flos-aquae and two Microcystis aeruginosa cultures Acceleration impacted by M. wesenbergii
17 Cyanobacteria impacts spawning and fertilization in lab studies Results can be used to enhance population model estimates A chemical tool for reducing dreissenid reproduction might be derived from cyanobacteria to be used in tandem with other control efforts Microcystis aeruginosa Aphanizomenon flos aquae
18 United States Geological Survey David Pitts Lab, Wayne State University Sue Watson ECC Canada Lab Colleagues: Darrin Hunt Corey Krabbenhoft Ali Shakoor Andrew Camilleri Razi Antoon
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