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Assemblage structure: an overlooked component of human-mediated species movements among freshwater ecosystems

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The spread and impact of alien species among freshwater ecosystems has increased with global trade and human movement; therefore, quantifying the role of anthropogenic and ecological factors that increase the risk of invasion is an important conservation goal. Two factors considered as null models when assessing the potential for invasion are colonization pressure (i.e., the number of species introduced) and propagule pressure [i.e., the number (propagule size), and frequency (propagule number), of individuals of each species introduced]. We translate the terminology of species abundance distributions to the invasion terminology of propagule size and colonization size (PS and CS, respectively). We conduct hypothesis testing to determine the underlying statistical species abundance distribution for zooplankton assemblages transported between freshwater ecosystems; and, on the basis of a lognormal distribution, construct four hypothetical assemblages spanning assemblage structure, rank-abundance gradient (e.g., even vs uneven), total abundance (of all species combined), and relative contribution of PS vs CS. For a given CS, many combinations of PS and total abundance can occur when transported assemblages conform to a lognormal species abundance distribution; therefore, for a given transportation event, many combinations of CS and PS are possible with potentially different ecological outcomes. An assemblage exhibiting high PS but low CS (species poor, but highly abundant) may overcome demographic barriers to establishment, but with lower certainty of amenable environmental conditions in the recipient region; whereas, the opposite extreme, high CS and low PS (species rich, but low abundance per species) may provide multiple opportunities for one of n arriving species to circumvent environmental barriers, albeit with lower potential to overcome demographic constraints. Species abundance distributions and the corresponding influence of CS and PS are some of many influential factors (e.g., demographic and genetic stochasticity, environmental variability, composition of recipient ecosystems) that will help refine an understanding of establishment risk following the human-mediated movement of species. 

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Johanna N. Bradie, David Andrew R. Drake, Dawson Ogilvie, Oscar Casas-Monroy, Sarah A. Bailey (2021)
Ballast Water Exchange Plus Treatment Lowers Species Invasion Rate in Freshwater Ecosystems. Environmental Science & Technology, 55(1), 82.
10.1021/acs.est.0c05238
Danni Chang, Xinzhong Hu, Zhen Ma (2022)
Pea-Resistant Starch with Different Multi-scale Structural Features Attenuates the Obesity-Related Physiological Changes in High-Fat Diet Mice. Journal of Agricultural and Food Chemistry, 70(36), 11377.
10.1021/acs.jafc.2c03289
D. Andrew R. Drake, Oscar Casas‐Monroy, Marten A. Koops, Sarah A. Bailey, Andrew Tatem (2015)
Propagule pressure in the presence of uncertainty: extending the utility of proxy variables with hierarchical models. Methods in Ecology and Evolution, 6(11), 1363.
10.1111/2041-210X.12429
Darragh J. Woodford, David M. Richardson, Hugh J. MacIsaac, Nicholas E. Mandrak, Brian W. van Wilgen, John R. U. Wilson, Olaf L. F. Weyl (2016)
Confronting the wicked problem of managing biological invasions. NeoBiota, 31, 63.
10.3897/neobiota.31.10038
Eric Dexter, Stephen M. Bollens, Jeffery Cordell, Ho Young Soh, Gretchen Rollwagen-Bollens, Susanne P. Pfeifer, Jérôme Goudet, Séverine Vuilleumier (2018)
A genetic reconstruction of the invasion of the calanoid copepod Pseudodiaptomus inopinus across the North American Pacific Coast. Biological Invasions, 20(6), 1577.
10.1007/s10530-017-1649-0
Farrah T. Chan, Johanna Bradie, Elizabeta Briski, Sarah A. Bailey, Nathalie Simard, Hugh J. MacIsaac (2015)
Assessing introduction risk using species’ rank-abundance distributions. Proceedings of the Royal Society B: Biological Sciences, 282(1799), 20141517.
10.1098/rspb.2014.1517
Farrah T. Chan, Hugh J. MacIsaac, Sarah A. Bailey, Martin Krkošek (2015)
Relative importance of vessel hull fouling and ballast water as transport vectors of nonindigenous species to the Canadian Arctic. Canadian Journal of Fisheries and Aquatic Sciences, 72(8), 1230.
10.1139/cjfas-2014-0473

Supporting Agencies

financial support from the CNR (Italy) for a short-term mobility grant to HJM, NSERC Discovery grants to HJM and SAB, NSERC scholarship to FC, and NSERC Visiting Fellow Stipends to DARD and EB from Transport Canada and Fisheries and Oceans Canada.
Farrah T. Chan, University of Windsor
Great Lakes Institute for Environmental Research
Hugh J. MacIsaac, University of Windsor

NSERC Canadian Aquatic Invasive Species Network II, Great Lakes Institute for Environmental Research

How to Cite

Drake, D. Andrew R., Farrah T. Chan, Elizabeta Briski, Sarah A. Bailey, and Hugh J. MacIsaac. 2014. “Assemblage Structure: An Overlooked Component of Human-Mediated Species Movements Among Freshwater Ecosystems”. Journal of Limnology 73 (s1). https://doi.org/10.4081/jlimnol.2014.802.

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