Prawn parade: notes on Macrobrachium australiense Holthius, 1950 climbing vertical concrete overflow steps at Gold Creek Reservoir, Queensland

2019 ◽  
Vol 70 (10) ◽  
pp. 1480
Author(s):  
Janne J. Torkkola ◽  
Donna W. Hemsley
Keyword(s):  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Current Source ◽  
Dispersal Ability ◽  
Broad Distribution ◽  
Current Stimulus ◽  
Limited Dispersal ◽  
Australian Freshwater

The freshwater palaemonid shrimp, Macrobrachium australiense, is widespread throughout eastern Australian freshwater catchments. Population genetic structure suggests limited dispersal ability, despite its broad distribution, with one case of observed springtime climbing migration at Queensland’s Dawson Weir. Here, we describe a second record of observed climbing migration, from Queensland’s Gold Creek Reservoir in August 2018. We discuss the likely causes of these migrations, agreeing with Lee and Fielder’s (1979) assessment of intermittent current stimulus and collective rheotactic response leading to mass climbing towards current source.

scholarly journals Oceanographic features and limited dispersal shape the population genetic structure of the vase sponge Ircinia campana in the Greater Caribbean

Heredity ◽  
2020 ◽  
Vol 126 (1) ◽  
pp. 63-76
Author(s):  
Sarah M. Griffiths ◽  
Mark J. Butler ◽  
Donald C. Behringer ◽  
Thierry Pérez ◽  
Richard F. Preziosi
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Larval Dispersal ◽  
Population Genetic ◽  
Spatial Genetic Structure ◽  
Florida Keys ◽  
The United States ◽  
Limited Dispersal ◽  
Mass Mortalities

AbstractUnderstanding population genetic structure can help us to infer dispersal patterns, predict population resilience and design effective management strategies. For sessile species with limited dispersal, this is especially pertinent because genetic diversity and connectivity are key aspects of their resilience to environmental stressors. Here, we describe the population structure of Ircinia campana, a common Caribbean sponge subject to mass mortalities and disease. Microsatellites were used to genotype 440 individuals from 19 sites throughout the Greater Caribbean. We found strong genetic structure across the region, and significant isolation by distance across the Lesser Antilles, highlighting the influence of limited larval dispersal. We also observed spatial genetic structure patterns congruent with oceanography. This includes evidence of connectivity between sponges in the Florida Keys and the southeast coast of the United States (>700 km away) where the oceanographic environment is dominated by the strong Florida Current. Conversely, the population in southern Belize was strongly differentiated from all other sites, consistent with the presence of dispersal-limiting oceanographic features, including the Gulf of Honduras gyre. At smaller spatial scales (<100 km), sites showed heterogeneous patterns of low-level but significant genetic differentiation (chaotic genetic patchiness), indicative of temporal variability in recruitment or local selective pressures. Genetic diversity was similar across sites, but there was evidence of a genetic bottleneck at one site in Florida where past mass mortalities have occurred. These findings underscore the relationship between regional oceanography and weak larval dispersal in explaining population genetic patterns, and could inform conservation management of the species.

Landscape context and dispersal ability as determinants of population genetic structure in freshwater fishes

2021 ◽  
Author(s):  
James J. Shelley ◽  
Owen J. Holland ◽  
Stephen E. Swearer ◽  
Timothy Dempster ◽  
Matthew C. Le Feuvre ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Freshwater Fishes ◽  
Landscape Context ◽  
Dispersal Ability

scholarly journals The influence of gene flow and drift on genetic and phenotypic divergence in two species of Zosterops in Vanuatu

2010 ◽  
Vol 365 (1543) ◽  
pp. 1077-1092 ◽  
Author(s):  
Sonya M. Clegg ◽  
Albert B. Phillimore
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Bird Species ◽  
Dispersal Ability ◽  
Phenotypic Divergence ◽  
Genetic Patterns ◽  
Changing Patterns ◽  
Regional Population

Colonization of an archipelago sets the stage for adaptive radiation. However, some archipelagos are home to spectacular radiations, while others have much lower levels of diversification. The amount of gene flow among allopatric populations is one factor proposed to contribute to this variation. In island colonizing birds, selection for reduced dispersal ability is predicted to produce changing patterns of regional population genetic structure as gene flow-dominated systems give way to drift-mediated divergence. If this transition is important in facilitating phenotypic divergence, levels of genetic and phenotypic divergence should be associated. We consider population genetic structure and phenotypic divergence among two co-distributed, congeneric (Genus: Zosterops ) bird species inhabiting the Vanuatu archipelago. The more recent colonist, Z. lateralis , exhibits genetic patterns consistent with a strong influence of distance-mediated gene flow. However, complex patterns of asymmetrical gene flow indicate variation in dispersal ability or inclination among populations. The endemic species, Z. flavifrons , shows only a partial transition towards a drift-mediated system, despite a long evolutionary history on the archipelago. We find no strong evidence that gene flow constrains phenotypic divergence in either species, suggesting that levels of inter-island gene flow do not explain the absence of a radiation across this archipelago.

Population genetic structure of economically important Tortricidae (Lepidoptera) in South Africa: a comparative analysis

2009 ◽  
Vol 100 (4) ◽  
pp. 421-431 ◽  
Author(s):  
A.E. Timm ◽  
H. Geertsema ◽  
L. Warnich
Keyword(s):  
South Africa ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Codling Moth ◽  
Population History ◽  
Oriental Fruit Moth ◽  
Dispersal Ability ◽  
Aflp Analysis ◽  
Genetic Structures

AbstractComparative studies of the population genetic structures of agricultural pests can elucidate the factors by which their population levels are affected, which is useful for designing pest management programs. This approach was used to provide insight into the six Tortricidae of major economic importance in South Africa. The population genetic structure of the carnation wormE. acerbellaand the false codling mothT. leucotreta, analyzed using amplified fragment length polymorphism (AFLP) analysis, is presented here for the first time. These results were compared with those obtained previously for the codling mothCydia pomonella, the oriental fruit mothGrapholita molesta, the litchi mothCryptophlebia peltasticaand the macadamia nut borerT. batrachopa. Locally adapted populations were detected over local geographic areas for all species. No significant differences were found among population genetic structures as result of population history (whether native or introduced) although host range (whether oligophagous or polyphagous) had a small but significant effect. It is concluded that factors such as dispersal ability and agricultural practices have the most important effects on genetically structuring populations of the economically important Tortricidae in South Africa.

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