EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

<< BACK TO AGENDA

5/23/2019 | 3:00 PM - 3:15 PM | SALTS CAN SUBSIDIZE OR IMPAIR SHREDDER PERFORMANCE: SALT ION TYPE AND PATHWAY OF EXPOSURE MATTER | 151 ABC

SALTS CAN SUBSIDIZE OR IMPAIR SHREDDER PERFORMANCE: SALT ION TYPE AND PATHWAY OF EXPOSURE MATTER

Anthropogenic salinization can impair ecosystems by changing species’ functional capacities, without altering community structure. Few studies document how ion-specific effects could alter shredder performance, either from altered osmoregulatory energy demand or litter quality from microbial exposure. Three microcosm experiments were implemented to identify pathways of ion-specific effects at sub-lethal concentrations: (1) leaf-disks and associated biofilms kept in a gradient (16, 32, and 64 mg/L NaCl or NaHCO3) of salt-amended or unamended (~3 mg/L NaCl) streamwater, (2) shredders (Lepidostoma sp.) kept in a gradient of salt-amended streamwater, and (3) shredders kept in unamended streamwater and fed leaf-disks incubated in a salt-amended streamwater gradient. Compared to streamwater, shredders grew 6x less in NaCl-amended water and excreted 50x more in the highest NaCl treatment, while eating similarly. Shredder growth efficiencies were therefore reduced in NaCl compared to NaHCO3 and streamwater. In contrast, shredders fed salt-incubated leaves displayed increasing growth trends in both salt types. Although shredders ate similarly, they excreted ~8x less from salt-incubated leaves. The enhanced shredder growth efficiencies support a sodium subsidy effect. Results suggest salts impair or subsidize shredder function depending on the ion type and exposure pathway.

Decomposition
Organic Matter
Invertebrate

Presentation:
This presentation has not yet been uploaded.

Handouts:
Handout is not Available

Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference

Presenters/Authors

Anastasia Mogilevski (), University of Central Arkansas, amogilevski1@cub.uca.edu;