https://openprairie.sdstate.edu/oak-lake_presentations/1007/thumbnail.jp

Troelstrup, Nels H., Jr.

Wollman, Katherine M.

English

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South Dakota State UniversityOpen PRAIRIE: Open Public Research Access InstitutionalRepository and Information ExchangeOak Lake Field Station 30th Anniversary Retreat Presentations2019Pyganodon grandis growth along a trophic stategradient in Eastern South Dakota LakesKatherine M. WollmanSouth Dakota State UniversityNels H. Troelstrup Jr.South Dakota State University, nels.troelstrup@sdstate.eduFollow this and additional works at: https://openprairie.sdstate.edu/oak-lake_presentationsPart of the Aquaculture and Fisheries Commons, and the Marine Biology CommonsThis Book is brought to you for free and open access by Open PRAIRIE: Open Public Research Access Institutional Repository and InformationExchange. It has been accepted for inclusion in Oak Lake Field Station 30th Anniversary Retreat Presentations by an authorized administrator of OpenPRAIRIE: Open Public Research Access Institutional Repository and Information Exchange. For more information, please contactmichael.biondo@sdstate.edu.Recommended CitationWollman, Katherine M. and Troelstrup, Nels H. Jr., "Pyganodon grandis growth along a trophic state gradient in Eastern South DakotaLakes" (2019). Oak Lake Field Station 30th Anniversary Retreat Presentations. 2.https://openprairie.sdstate.edu/oak-lake_presentations/2Pyganodon grandis growth along a trophic state gradient in eastern South Dakota lakesKatherine M. Wollman & Nels H. Troelstrup, Jr.Unionid Background• The most imperiled group of freshwater organisms.• 820 species described worldwide• 294 species found in North America• Declining species richness• Provide ecosystem services• Bioindicator• Freshwater mussels in South Dakota EutrophicationStressors• Oxygen depletion • Cyanotoxins • Sedimentation • Reduction or loss of fish host Benefits• Increased food availability• Growth• Total length(Image: https://creeklife.com/blog/cultural-eutrophication-an-accelerator/)• A nutrient enrichment process • Algae growth and nutrient loadingQuestions• 1) Is there a significant relationship between Pyganodon grandis age and trophic state of a lake?• 2) Do Pyganodon grandis growth rate and estimated maximum size vary among lake trophic states? • 3) Is there a significant relationship between Pyganodon grandissurvival rate and trophic state of a lake?Study Area• South Dakota D.E.N.R publicly owned and managed lakes. MissouriJamesVermillionBig SiouxMinnesotaRedData CollectionField Methods• Two-person- hour search• Secchi depth• Shell measurements • Sacrifice of live P. grandis (n=10)Laboratory Methods • Thin-sectioning of shells (Neves & Moyer 1988)• Age (years) and growth (cm) were counted and measured.Age & Growth Analysis• Data Analysis • Trophic State Index (SD) = 60 – 14.41*ln(SD)• Von Bertalanffy: L(t)= Linf (1-e -K(t-t0))• Linf = estimated maximum mean size• K = growth rate• Comparisons among trophic states • ANOVATrophic State IndexClass RangeMesotrophic: 35-50Eutrophic: 51-65Hypereutrophic: 65-100Results• 2017 Survey• 9 total species found• 43% of lakes had freshwater mussels• 36% of lakes had Pyganodon grandis• 192 specimens • Average age of 6.4 years• Average total length of 7.6 cm• 21 lakes (18% of lakes)• 3 mesotrophic lakes• 13 eutrophic lakes• 5 hypereutrophic lakes• Eutrophic• Linf= 8.36• K= 0.23• Mesotrophic• Linf= 13.85• K= 0.18• Hypereutrophic• Linf= 9.29• K= 0.39P-value= 0.26 P-value= 0.33Conclusions• Hypereutrophic lakes had the quickest growth rate (K), but had the smallest estimated mean size. • Increase in food availability has shown increase in growth rate (Arter 1989, Bauer & Wӓchtler 2000).• Faster growth correlates with shorter life spans (Bauer 1992, Patzner & Mϋller2001).• No statistical differences in growth and estimated mean size among trophic states.•AcknowledgmentsCommittee• Dr. Nels Troelstrup, Jr.• Dr. Michael Brown• Dr. Thomas Brandenburger• Dr. Severine Van SlambrouckTechnicians• Katlyn Beebout• Blake Roetman

\u3cem\u3ePyganodon grandis\u3c/em\u3e growth along a trophic state gradient in Eastern South Dakota Lakes

https://openprairie.sdstate.edu/cgi/viewcontent.cgi?article=1007&amp;context=oak-lake_presentations

\u3cem\u3ePyganodon grandis\u3c/em\u3e growth along a trophic state gradient in Eastern South Dakota Lakes

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