Panmictic population structure in the migratory marine sparid Acanthopagrus australis despite its close association with estuaries

Roberts, David G.; Ayre, David J.

doi:10.3354/meps08676

Cited by 22 publications

(9 citation statements)

References 40 publications

(40 reference statements)

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“…The coastal and inter‐estuary movements of adult dusky flathead together with the potential relocation and mixing of eggs and larvae along the coast, suggest there is substantial population mixing along eastern Australia. Although genetic studies on dusky flathead are limited, they do suggest a potentially panmictic population (Roberts et al., ) as evidenced for other east Australian teleosts (Roberts and Ayre, ). Further widespread genetic sampling is required, however, to test this hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Spawning, maturity, growth and movement of Platycephalus fuscus (Cuvier, 1829) (Platycephalidae): fishery management considerations

Gray¹,

Barnes²

2015

J. Appl. Ichthyol.

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Summary The dusky flathead (Platycephalus fuscus) is an important teleost harvested by recreational and commercial fishers throughout its endemic distribution along eastern Australia. This study indicates that the species has an extended spawning period throughout the austral summer, with females in spawning condition occurring in lower estuarine and coastal waters. Total length (L50) and age (A50) at which 50% (±1 SE) of the population was mature was 31.72 (±1.08) cm TL and 1.22 (±0.44) years for males and 56.75 (±0.60) cm TL and 4.55 (±0.13) years for females. The von Bertalanffy growth parameters differed significantly between sexes; females grew faster and attained a greater maximum TL and age than males. The largest female was 98.5 cm TL (7.5 kg), and the oldest 16 years, whereas the largest male was 61.5 cm TL (1.58 kg) and 11 years of age. A tag‐and‐release study identified the exchange of sub‐adult and mature‐sized individuals among estuaries. Determinations of length‐based management regulations for the species are compounded by the large gender‐based differences in growth and length‐at‐maturity. Current minimum legal lengths of 30–40 cm TL protect approximately 3–9% of the female spawning population. Alternative management options, including harvest slot sizes, need to be investigated and tested.

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Section: Discussionmentioning

confidence: 99%

Spawning, maturity, growth and movement of Platycephalus fuscus (Cuvier, 1829) (Platycephalidae): fishery management considerations

Gray¹,

Barnes²

2015

J. Appl. Ichthyol.

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“…Regardless, these results suggest that the nature of this coastline with 4 major estuarine systems interspersed along the rocky, open shore need not be treated any differently in terms of connectivity of this habitat forming kelp, than another section of coastline in NSW. However, consideration must be given to obligate estuarine species as well as those that may spend part of their life cycle exclusively in estuaries as such species are likely to exhibit unique patterns of genetic structure and connectivity [46], [14], [47], [48].…”

Section: Discussionmentioning

confidence: 99%

Connectivity of the Habitat-Forming Kelp, Ecklonia radiata within and among Estuaries and Open Coast

Coleman

2013

PLoS ONE

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With marine protected areas being established worldwide there is a pressing need to understand how the physical setting in which these areas are placed influences patterns of dispersal and connectivity of important marine organisms. This is particularly critical for dynamic and complex nearshore marine environments where patterns of genetic structure of organisms are often chaotic and uncoupled from broad scale physical processes. This study determines the influence of habitat heterogeneity (presence of estuaries) on patterns of genetic structure and connectivity of the common kelp, Ecklonia radiata. There was no genetic differentiation of kelp between estuaries and the open coast and the presence of estuaries did not increase genetic differentiation among open coast populations. Similarly, there were no differences in level of inbreeding or genetic diversity between estuarine and open coast populations. The presence of large estuaries along rocky coastlines does not appear to influence genetic structure of this kelp and factors other than physical heterogeneity of habitat are likely more important determinants of regional connectivity. Marine reserves are currently lacking in this bioregion and may be designated in the future. Knowledge of the factors that influence important habitat forming organisms such as kelp contribute to informed and effective marine protected area design and conservation initiatives to maintain resilience of important marine habitats.

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“…Acanthopagrus australis [Günther]) maintain panmictic genetic structure via larval dispersal in the EAC (Roberts & Ayre, 2010). supporting the current assessment and management at the state level (Johnston et al, 2018).…”

Section: Patterns In Larval Dispersal and Connectivitymentioning

confidence: 64%

Mesoscale oceanographic features drive divergent patterns in connectivity for co‐occurring estuarine portunid crabs

Hewitt

Schilling

Hanamseth

et al. 2022

Fisheries Oceanography

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Larval dispersal and connectivity have important implications for fisheries management, especially for species with life cycles influenced by ocean boundary currents.Giant Mud Crab (Scylla serrata) and Blue Swimmer Crab (Portunus armatus) are two estuarine portunid crabs (Family: Portunidae) that support significant commercial and recreational harvest in eastern Australia. Giant Mud Crab migrate to coastal waters to spawn, and while Blue Swimmer Crab spawn primarily within estuaries they occasionally migrate to coastal waters to spawn, followed by larval dispersal in the East Australian Current (EAC). Here, we coupled a high-resolution oceanographic model with a Lagrangian particle tracking framework to simulate larval dispersal and determine the extent of population connectivity in this region. Our simulations indicate broad-scale connectivity ($40-400 km), characterised by high inter-estuary connectivity. Overall, our results suggest a north-to-south source-sink structure for both species, with contributions of particles from the north ranging from 51% to 99%.Recruitment to a given estuary is dependent on the proximity of mesoscale oceanographic features of the EAC. Most notably, the EAC separation acts as a barrier to recruitment between spawning and settlement to the north/south of this region. This significantly limits interjurisdictional connectivity for these species, especially Blue Swimmer Crab, likely due to a shorter pelagic larval duration than Giant Mud Crab.Our results provide evidence to inform the assessment and management of these species.

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Panmictic population structure in the migratory marine sparid Acanthopagrus australis despite its close association with estuaries

Cited by 22 publications

References 40 publications

Spawning, maturity, growth and movement of Platycephalus fuscus (Cuvier, 1829) (Platycephalidae): fishery management considerations

Spawning, maturity, growth and movement of Platycephalus fuscus (Cuvier, 1829) (Platycephalidae): fishery management considerations

Connectivity of the Habitat-Forming Kelp, Ecklonia radiata within and among Estuaries and Open Coast

Mesoscale oceanographic features drive divergent patterns in connectivity for co‐occurring estuarine portunid crabs

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