Fragment dispersal and plant-induced dieback explain irregular ring-shaped pattern formation in a clonal submerged macrophyte

Vilas, Maria P., Adams, Matthew P., Oldham, Carolyn E, Marti, Clelia L. and Hipsey, Matthew R. (2017) Fragment dispersal and plant-induced dieback explain irregular ring-shaped pattern formation in a clonal submerged macrophyte. Ecological Modelling, 363 111-121. doi:10.1016/j.ecolmodel.2017.09.001

Author Vilas, Maria P.
Adams, Matthew P.
Oldham, Carolyn E
Marti, Clelia L.
Hipsey, Matthew R.
Title Fragment dispersal and plant-induced dieback explain irregular ring-shaped pattern formation in a clonal submerged macrophyte
Journal name Ecological Modelling   Check publisher's open access policy
ISSN 0304-3800
Publication date 2017-11-10
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.ecolmodel.2017.09.001
Open Access Status Not yet assessed
Volume 363
Start page 111
End page 121
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract Submerged macrophytes can colonize shallow lakes via several reproductive mechanisms, and can in turn substantially alter these environments by modifying the thermal structure and dissolved oxygen levels within these lakes. Although multiple mechanisms of submerged macrophyte expansion have been described, the relative contribution of each of these in shallow lake environments has been largely overlooked. In this study we analyzed the spatial spread and patterning during seasonal growth of a globally invasive submerged macrophyte, Potamogeton crispus, in a shallow urban lake (Lake Monger, Western Australia). We used underwater and aerial imagery to estimate the spatial pattern of the P. crispus bed. By comparing the spatial extent of the bed at different times during the growing season, we found linear expansion rates two orders of magnitude higher than those previously estimated through rhizome elongation. We formulated a deterministic mathematical model that accounted for the ability of P. crispus to spread through rhizomes and fragments broken off by the feeding activities of aquatic birds, to assess the contribution of fragment dispersal to the emergent patterns of the submerged macrophyte bed. In addition to accounting for dispersal from fragments, the model also accounted for a hypothesized feedback between macrophyte-induced thermal stratification and central dieback. Comparison of our model results against field data indicated that the model accurately represented the spatial spread of the macrophyte bed when fragment dispersal was included. When fragment dispersal was not included in the model, the spatial spread of the bed was largely underestimated, suggesting that fragment dispersal may well account for the fast seasonal spread of this species. The model also captured the formation of a ring-shaped pattern in spatial macrophyte distribution suggesting that both fragment dispersal and the feedback between stratification and dieback are necessary to reproduce the spatial structure of the macrophyte bed. Our results highlight the potential important role of fragment dispersal in facilitating colonization and submerged macrophyte invasion in shallow lakes. (C) 2017 Elsevier B.V. All rights reserved.
Keyword Potamogeton crispus
Shallow lakes
Fragment dispersal
Plant-induced dieback
Pattern formation
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID LP130100756
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Wed, 13 Sep 2017, 23:41:32 EST by Matthew Adams on behalf of School of Chemical Engineering