Comparison of the influence of patch-scale and meadow-scale characteristics on flow within seagrass meadows: a flume study

Adhitya, A., Bouma, T. J., Folkard, A. M., van Katwijk, M. M., Callaghan, D., de Iongh, H. H. and Herman, P. M. J. (2014) Comparison of the influence of patch-scale and meadow-scale characteristics on flow within seagrass meadows: a flume study. Marine Ecology Progress Series, 516 49-59. doi:10.3354/meps10873


Author Adhitya, A.
Bouma, T. J.
Folkard, A. M.
van Katwijk, M. M.
Callaghan, D.
de Iongh, H. H.
Herman, P. M. J.
Title Comparison of the influence of patch-scale and meadow-scale characteristics on flow within seagrass meadows: a flume study
Journal name Marine Ecology Progress Series   Check publisher's open access policy
ISSN 0171-8630
1616-1599
Publication date 2014-12-03
Year available 2014
Sub-type Article (original research)
DOI 10.3354/meps10873
Open Access Status DOI
Volume 516
Start page 49
End page 59
Total pages 11
Place of publication Oldendorf, Germany
Publisher Inter-Research
Language eng
Subject 1105 Ecology, Evolution, Behavior and Systematics
1104 Aquatic Science
2303 Ecology
Abstract Hydrodynamic processes are an important agent of stress and facilitation in seagrass meadows, but little is known about the effects of the common phenomenon of heterogeneity of seagrass meadows on their interactions with hydrodynamic processes. To address this gap in knowledge, 4 heterogeneous configurations of Posidionia oceanica mimics were analyzed in a laboratory flume. The 4 configurations were created by placing 4 boards of mimics, i.e. 2 with high shoot density (similar to 1100 shoots m(-2)) and 2 with low shoot density (similar to 400 m(-2)), in different patterns (checkerboard, parallel, dense-sparse, and sparse-dense). Our results show that volumetric flow rate through each canopy, which is an indicator of the rate of supply of resources transported by the flow, tended to be greater in the low-density patches, regardless of the configuration. We also found that the Reynolds stress component tau(Re) was positive in the lower-density patches (indicating that horizontal momentum was being transferred into the patch) and negative in the high-density patches (indicating that horizontal momentum was being transferred upwards out of the patch). Our results suggest that in resource-limited environments, hydrodynamic processes favor the growth of lower-density patches in heterogeneous seagrass meadows, thereby causing meadows to become more homogeneous over time.
Formatted abstract
Hydrodynamic processes are an important agent of stress and facilitation in seagrass meadows, but little is known about the effects of the common phenomenon of heterogeneity of seagrass meadows on their interactions with hydrodynamic processes. To address this gap in knowledge, 4 heterogeneous configurations of Posidionia oceanica mimics were analyzed in a laboratory flume. The 4 configurations were created by placing 4 boards of mimics, i.e. 2 with high shoot density (~1100 shoots m-2) and 2 with low shoot density (~400 m-2), in different patterns (checkerboard, parallel, dense-sparse, and sparse-dense). Our results show that volumetric flow rate through each canopy, which is an indicator of the rate of supply of resources transported by the flow, tended to be greater in the low-density patches, regardless of the configuration. We also found that the Reynolds stress component τRe was positive in the lower-density patches (indicating that horizontal momentum was being transferred into the patch) and negative in the high-density patches (indicating that horizontal momentum was being transferred upwards out of the patch). Our results suggest that in resource-limited environments, hydrodynamic processes favor the growth of lower-density patches in heterogeneous seagrass meadows, thereby causing meadows to become more homogeneous over time.
Keyword Seagrass
Posidionia oceanica
Hydrodynamics
Heterogeneity
Patches
Shoot density
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID WT 84-644
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2015 Collection
 
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Created: Tue, 23 Dec 2014, 13:50:36 EST by System User on behalf of School of Civil Engineering