• Influence of an introduced diatom {Didymosphenia geminata) and directed control 
measures on the biological community composition of Rapid Creek, SDGFP. A 
study is currently being developed to examine the impact of Didymosphenia geminata on 
benthic and fish community composition of Rapid Creek below Pactola Dam. Research 
will also study the effects of control measures (localized nutrient enrichments) on 
Didymosphenia geminata distribution and overall stream biological community 
composition. 
A.42.3. CLIMATE CHANGE CONCERNS 
• Originally South Dakota did not think tamarisk could survive in warm temperatures, but 
it seems to be adapting. 
• The state’s 5-year drought has led to a severe increase in the population of tamarisk. 
When water shrinks back from the edge of lakes or rivers, tamarisk is able to grow in this 
habitat. 
A.42.4. CLIMATE CHANGE ACTIONS 
(None reported.) 
A.42.5. RESEARCH ACTIVITIES AND INFORMATION USED 
(None reported.) 
A.42.6. RESEARCH NEEDS 
• More on-the-ground surveying and more plant recognition capability are needed. 
• Rise in mussel activity needs to be identified through monitoring efforts. 
• Information should be distributed to those who use the state’s water bodies. Outreach 
and education is currently on a project-by-project basis due to lack of capacity. 
• The biological impacts of curlyleaf pondweed on lake ecosystems need to be better 
understood. 
• Targeted monitoring for ANS presence in lakes needs to be implemented throughout 
South Dakota. 
• A rapid response strategy for ANS detection and management needs to be developed in 
South Dakota. 
• An overall strategic plan for ANS needs to be developed, extending beyond the 
responsibilities of SDGFP. This overall plan should incorporate involvement from 
federal, state, local, and private interests throughout the state. 
A-106 
