The niche and morphology of the invasive Daphnia lumholtzi in a subtropical reservoir, 20 years after invasion

Beyer, Jessica E.; Hambright, K. David

The niche and morphology of the invasive Daphnia lumholtzi in a subtropical reservoir, 20 years after invasion

dc.contributor.advisor
dc.contributor.author	Beyer, Jessica E.
dc.contributor.author	Hambright, K. David
dc.date.accessioned	2020-10-29T21:06:46Z
dc.date.available	2020-10-29T21:06:46Z
dc.date.issued	2019-01-11
dc.description.abstract	The establishment and persistence of invasive species are continuously shaped by resource availability, competition and predation, yet most research is conducted immediately after invasion. Twenty years after Daphnia lumholtzi invaded Lake Texoma, OK-TX we uncovered seasonality in D. lumholtzi abundances and defensive morphology. Tail-spine growth was hyperallometric (faster than core body growth) in summer and fall, but allometric (growing at same rate as body) in winter. Head-spine growth declined with increasing body size, and was curvilinear in summer and fall, but linear in winter. Thus, we hypothesized that the selective predation pressure acting upon these traits is strongest in summer and fall and that the large plastic defensive spines allow persistence of D. lumholtzi. Additionally, we found that abundances of D. lumholtzi in Lake Texoma were best predicted by cyanobacteria concentration. However, as lab experiments have shown that D. lumholtzi does not have superior cyanobacteria tolerance, cyanobacteria may be serving as a proxy for another pressure shaping the abundance of D. lumholtzi, like a seasonal predator. The niche of this invasive species within Lake Texoma appears to be primarily limited by predation pressure, and further studies may illuminate whether this limiting factor is responsible for range limits within North America.	en_US
dc.description.peerreview	Yes	en_US
dc.description.sponsorship	Funding was provided by the Oklahoma Department of Wildlife Conservation (through the Sport Fish Restoration Program, Grant F-61-R to K.D.H), the University of Oklahoma Biological Station (through a Graduate Research Fellowship to J.E.B) and the University of Oklahoma Department of Biology (through an Adams Fellowship to J.E.B).
dc.identifier.citation	Beyer, J. E., and K. D. Hambright. (2019) The niche and morphology of the invasive Daphnia lumholtzi in a subtropical reservoir, 20 years after invasion. Journal of Plankton Research 41(2): 90-100. https://doi-org.ezproxy.lib.ou.edu/10.1093/plankt/fby053	en_US
dc.identifier.doi	10.1093/plankt/fby053	en_US
dc.identifier.uri	https://hdl.handle.net/11244/325642
dc.language	en_US	en_US
dc.subject	Daphnia lumholtzi	en_US
dc.subject	Biological invasion	en_US
dc.subject	Zooplankton	en_US
dc.subject	Morphology	en_US
dc.subject	Predation	en_US
dc.title	The niche and morphology of the invasive Daphnia lumholtzi in a subtropical reservoir, 20 years after invasion	en_US
dc.type	Article	en_US
ou.group	College of Arts and Sciences::Department of Biology	en_US