caa a22 4500 445893907 CHVBK 20180317145625.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10750-011-0620-9 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0620-9 Ecosystem-level effects of bioturbation by the tadpole shrimp Lepidurus packardi in temporary pond mesocosms [Elektronische Daten] [Russell Croel, Jamie Kneitel] An example of ecosystem engineering gaining attention in aquatic systems is bioturbation, the disruption of sediment at the water-sediment interface due to burrowing and foraging. One consequence of bioturbation can be increased turbidity from suspended sediment, which generally inhibits macrophyte growth and reduces ecosystem functioning. Conversely, bioturbation may promote invertebrate species richness by unearthing dormant cysts. Temporary-pond crustaceans are not widely regarded as agents of bioturbation, but on the basis of aquaria observations we hypothesized that certain taxa can disturb the sediment and create highly turbid water. We tested this hypothesis by removing crustaceans from mesocosms lined with vernal pool soil. Compared to this treatment group, mesocosms containing crustaceans had extremely high turbidity from suspended sediment, as well as reduced total macrophyte cover. We also found clear compositional differences in macrophyte communities between treatments, driven largely by differences in water physicochemistry, including turbidity. Regression analysis linked most of the bioturbation to the endangered notostracan Lepidurus packardi Simon 1886, which was a strong predictor of turbidity in our mesocosms. We also found a trend toward increased crustacean species richness in our mesocosms in the presence of this taxon. An analysis of published data from King et al. (1996) suggests that this trend may extend to natural vernal pools. Overall, our results suggest that L. packardi may have large effects on vernal pool communities, likely mediated in part through its disturbing of the sediment. Springer Science+Business Media B.V., 2011 Macrophytes nationallicence Ecosystem engineering nationallicence Notostraca nationallicence Turbidity nationallicence Sediment disturbance nationallicence Vernal pools nationallicence Croel Russell Department of Biological Sciences, California State University, Sacramento, 6000J Street, 95819-6077, Sacramento, CA, USA aut Kneitel Jamie Department of Biological Sciences, California State University, Sacramento, 6000J Street, 95819-6077, Sacramento, CA, USA aut Hydrobiologia Springer Netherlands 665/1(2011-05-01), 169-181 0018-8158 665:1<169 2011 665 10750 https://doi.org/10.1007/s10750-011-0620-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0620-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Croel Russell Department of Biological Sciences, California State University, Sacramento, 6000J Street, 95819-6077, Sacramento, CA, USA aut NATIONALLICENCE 700 1- Kneitel Jamie Department of Biological Sciences, California State University, Sacramento, 6000J Street, 95819-6077, Sacramento, CA, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 665/1(2011-05-01), 169-181 0018-8158 665:1<169 2011 665 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer