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Population Structures and Levels of Connectivity for Scyphozoan and Cubozoan Jellyfish

Marine Biology and Aquaculture, College of Science and Engineering and ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia
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Academic Editors: Michael Wink, Alenka Malej and Agustin Schiariti
Diversity 2021, 13(4), 174; https://doi.org/10.3390/d13040174
Received: 9 March 2021 / Revised: 7 April 2021 / Accepted: 12 April 2021 / Published: 19 April 2021
(This article belongs to the Special Issue Patterns and Ecology of Jellyfish in Marine Environment)
Understanding the hierarchy of populations from the scale of metapopulations to mesopopulations and member local populations is fundamental to understanding the population dynamics of any species. Jellyfish by definition are planktonic and it would be assumed that connectivity would be high among local populations, and that populations would minimally vary in both ecological and genetic clade-level differences over broad spatial scales (i.e., hundreds to thousands of km). Although data exists on the connectivity of scyphozoan jellyfish, there are few data on cubozoans. Cubozoans are capable swimmers and have more complex and sophisticated visual abilities than scyphozoans. We predict, therefore, that cubozoans have the potential to have finer spatial scale differences in population structure than their relatives, the scyphozoans. Here we review the data available on the population structures of scyphozoans and what is known about cubozoans. The evidence from realized connectivity and estimates of potential connectivity for scyphozoans indicates the following. Some jellyfish taxa have a large metapopulation and very large stocks (>1000 s of km), while others have clade-level differences on the scale of tens of km. Data on distributions, genetics of medusa and polyps, statolith shape, elemental chemistry of statoliths and biophysical modelling of connectivity suggest that some of the ~50 species of cubozoans have populations of surprisingly small spatial scales and low levels of connectivity. Despite their classification as plankton, therefore, some scyphozoans and cubozoans have stocks of small spatial scales. Causal factors that influence the population structure in many taxa include the distribution of polyps, behavior of medusa, local geomorphology and hydrodynamics. Finally, the resolution of patterns of connectivity and population structures will be greatest when multiple methods are used. View Full-Text
Keywords: medusa; scyphozoa; cubozoa; population; connectivity; population structure medusa; scyphozoa; cubozoa; population; connectivity; population structure
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MDPI and ACS Style

Kingsford, M.J.; Schlaefer, J.A.; Morrissey, S.J. Population Structures and Levels of Connectivity for Scyphozoan and Cubozoan Jellyfish. Diversity 2021, 13, 174. https://doi.org/10.3390/d13040174

AMA Style

Kingsford MJ, Schlaefer JA, Morrissey SJ. Population Structures and Levels of Connectivity for Scyphozoan and Cubozoan Jellyfish. Diversity. 2021; 13(4):174. https://doi.org/10.3390/d13040174

Chicago/Turabian Style

Kingsford, Michael J., Jodie A. Schlaefer, and Scott J. Morrissey. 2021. "Population Structures and Levels of Connectivity for Scyphozoan and Cubozoan Jellyfish" Diversity 13, no. 4: 174. https://doi.org/10.3390/d13040174

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