Artykuły w czasopismach: „Macrobrachium australiense”

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MAR, WIN, PENG-FEI KANG, BIN MAO i YU-FENG WANG. "Morphological and molecular features of some freshwater prawn species under genus Macrobrachium Spence Bate, 1868 (Crustacea: Decapoda: Palaemonidae) from Myanmar". Zootaxa 4388, nr 1 (28.02.2018): 123. http://dx.doi.org/10.11646/zootaxa.4388.1.9.

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Myanmar is abundant in lakes and rivers, yet only a few investigations on the fauna of shrimps and prawns have been conducted and no molecular characteristics of prawn species have been described. This study reveals the morphologically identification of five freshwater prawn species under the genus Macrobrachium, including M. cavernicola, M. australiense, M. johnsoni, M. josephi and Macrobrachium sp.WMY-2017. As there was no previous record and information concerning with M. australiense, M. johnsoni, M. josephi and Macrobrachium sp. WMY-2017, they were regarded as the first record from Myanmar. A fragment of Mitochondrial Cytochrome Oxidase I Gene (COI) was amplified successfully from three studied species: M. australiense, M. josephi, and Macrobrachium sp.WMY-2017. The interspecific divergences of studied species varied from 0.01 to 0.15. The phylogenetic tree based on COI fragment sequences showed that M. australiense was closely related to M. rosenbergii, while Macrobrachium sp. WMY-2017 was closest to M. josephi. The results of molecular phylogeny has clarified the relationship within the genus Macrobrachium and represents the first step toward understanding the pattern of speciation base on molecular approach in Myanmar.

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Murphy, Nicholas P., John W. Short i Christopher M. Austin. "Re-examination of the taxonomy of the Macrobrachium australiense Holthuis (Decapoda : Palaemonidae) species-complex: molecular evidence for a single species". Invertebrate Systematics 18, nr 2 (2004): 227. http://dx.doi.org/10.1071/is03003.

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The freshwater shrimp Macrobrachium australiense is distributed throughout the majority of inland, north-west, north-east and eastern drainages. Owing to the large amount of morphological divergence, both between and within catchments, this species has proven to be taxonomically difficult and, until recently, consisted of three separate species, each with subsequent subspecies. This study uses nucleotide sequences from the 16S rRNA mitochondrial gene region to investigate the genetic relationships between populations and confirm the taxonomic status of M. australiense. The results from sequencing an approximately 450-bp fragment from this gene region from M. australiense sampled from 12 locations across inland, eastern and northern Australia identified very little variation. The variation found between 16S M. australiense haplotypes is much less than that found between Macrobrachium species, indicating that it is in fact a single species. The results are concordant with a recent morphological revision of Australian species in which nominal taxa of the M. australiense complex were synonymised.

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Richardson, A. J., J. E. Growns i R. A. Cook. "Distribution and life history of caridean shrimps in regulated lowland rivers in southern Australia". Marine and Freshwater Research 55, nr 3 (2004): 295. http://dx.doi.org/10.1071/mf03126.

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Caridean shrimps are an integral component of lowland river ecosystems in south-eastern Australia, but their distributions may be affected by flow alteration. Monthly shrimp samples were collected from slackwaters in three hydrologically distinct sections of the heavily regulated Campaspe River and the less regulated Broken River for three consecutive years. The distributions of Paratya australiensis, Caridina mccullochi and Macrobrachium australiense, along with their life history in river sections with different hydrology are outlined. Paratya australiensis and M. australiense occurred in all sections, but C. mccullochi was absent from sections of the Campaspe River that received irrigation flows during summer/autumn. Shrimp larvae were most abundant in summer (December–February) and juvenile recruitment continued through to mid autumn (April). Breeding and recruitment of P. australiensis occurred for longer than other shrimps. Apart from large adult and berried M. australiense, all life stages of shrimps commonly occurred in slackwaters, particularly the larval and juvenile stages. Irrigation flows in summer/autumn probably adversely affect the size, extent and arrangement of slackwaters, at a time when they may be critical habitats for C. mccullochi larval development and recruitment. Dams and weirs in the Campaspe River may have influenced shrimp abundance and the timing of breeding.

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Richardson, A. J., i R. A. Cook. "Habitat use by caridean shrimps in lowland rivers". Marine and Freshwater Research 57, nr 7 (2006): 695. http://dx.doi.org/10.1071/mf05160.

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Caridean shrimps are an important component of lowland river ecosystems and their distributions may be affected by river regulation. We studied the mesoscale distributions of Paratya australiensis, Caridina mccullochi and Macrobrachium australiense in five lowland rivers of the Murray–Darling Basin, south-eastern Australia. We distinguished habitat patches according to water-current velocity and channel location – still littoral (SL), slow-current-velocity littoral (SCVL) and moderate-current-velocity channel (MCVC) – and investigated ontogenetic shifts in habitat use. We sampled seven reaches for shrimp in March 2003 and December 2003 using a modified backpack electrofisher. Paratya australiensis occurred in all habitats but was mostly associated with SL. All life stages of C. mccullochi utilised SL and SCVL, and only a few adults were collected from areas with greater than slow current velocity. The habitat preference of M. australiense changed with development: larvae only occurred in SL, but adults and berried females strongly preferred MCVC. Low flows and slow water currents are characteristic of lowland rivers in southern Australia during summer and autumn (December–April), the period during which shrimps’ larval development and juvenile recruitment occurs. Caridina mccullochi and M. australiense may rely on still and slow-current-velocity habitats during larval development and juvenile recruitment and to facilitate upstream movements.

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Bernays, Sofie J., Daniel J. Schmidt, David A. Hurwood i Jane M. Hughes. "Phylogeography of two freshwater prawn species from far-northern Queensland". Marine and Freshwater Research 66, nr 3 (2015): 256. http://dx.doi.org/10.1071/mf14124.

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The distribution of a freshwater species is often dependent on its ability to disperse within the riverine system. Species with high dispersal abilities tend to be widespread, whereas those with restricted dispersal tend to be geographically restricted and are usually given higher conservation priority. Population structure was compared between a widespread freshwater prawn species, Macrobrachium australiense, and a narrow-range endemic freshwater prawn, Macrobrachium koombooloomba. The distribution of M. australiense and M. koombooloomba did not overlap, although suggested historical river-boundary rearrangements indicate that there has been the potential for dispersal into neighbouring catchments. A fragment of the mtDNA CO1 gene was analysed and a Mantel test revealed a significant isolation by distance effect for both species. Significant overall FST values confirmed that both species exhibited low levels of dispersal, a prediction for populations inhabiting a fragmented upland environment. The level of structure in M. australiense is surprising for a widely distributed species. Not all M. australiense populations conformed to the stream-hierarchy model, with results being best explained by historical river realignment or cross-catchment dispersal. The fact that both species show limited dispersal highlights the importance of conservation in highland areas for both endemic and widely spread species.

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Sharma, Suman, i Jane M. Hughes. "Genetic structure and phylogeography of freshwater shrimps (Macrobrachium australiense and Macrobrachium tolmerum): the role of contemporary and historical events". Marine and Freshwater Research 60, nr 6 (2009): 541. http://dx.doi.org/10.1071/mf07235.

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Freshwater species are expected to show higher levels of genetic structuring than those inhabiting estuarine or marine environments because it is difficult for freshwater species to move between river systems. Previous genetic studies of freshwater species from coastal streams in south-east Queensland had proposed that several of these streams had a common confluence relatively recently, when sea levels were lower ~10 000 years bp. The present study was undertaken to test this idea using two freshwater shrimp species, Macrobrachium australiense and Macrobrachium tolmerum. In M. australiense, there was a major phylogeographical break in the middle of the Sunshine Coast region that was expected to be homogeneous because these creeks may have had a shared confluence before entering the sea, possibly because of extremely limited dispersal abilities compounded over many generations. In M. tolmerum, there was evidence of a recent population expansion and also some evidence of limited gene flow between sites. This is explained by recent colonisation of the area and limited gene flow between river systems, despite the ability of this species to survive in brackish water conditions. The present study shows that even species that are taxonomically very close and that co-occur in the same habitats can have vastly different population structures.

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Lammers, Jan H., Bronwen W. Cribb i Kevin Warburton. "Diurnal Refuge Competition in the Freshwater Prawn, Macrobrachium Australiense". Journal of Crustacean Biology 29, nr 4 (1.01.2009): 476–83. http://dx.doi.org/10.1651/08-3093.1.

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Sheldon, Fran, i Keith F. Walker. "Spatial distribution of littoral invertebrates in the lower Murray - Darling River system, Australia". Marine and Freshwater Research 49, nr 2 (1998): 171. http://dx.doi.org/10.1071/mf96062.

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The abundance and richness of macroinvertebrates in the lower Murray and Darling rivers were examined at a macroscale (rivers), mesoscale (billabongs, backwaters, channel) and microscale (vegetation, snags, substrata). In the Darling, insects dominated (85% of taxa, 81% of individuals); the richest taxa were Diptera (26 taxa) and Coleoptera (15 taxa) and the most abundant were Hemiptera (47%) and Diptera (35%). In the Murray, insects again dominated (84% of taxa, 52% of individuals), particularly Diptera (22 taxa), Coleoptera (12 taxa) and Hemiptera (9 taxa), but there were more crustaceans (9% of taxa, 47% of individuals, particularly the atyid shrimp Paratya australiensis). Both assemblages were uneven: in the Darling, >50% of biomass was Micronecta spp. (Corixidae), Dicrotendipes sp. (Chironomidae) and Macrobrachium australiense (Palaemonidae); in the Murray, 70% of biomass was P. australiensis and Caridina mccullochi (Atyidae) and the insects Micronecta spp. (Corixidae) and Chironomus sp. (Chironomidae). Abundances generally were greatest in the Murray. Hydrologic and geomorphic factors influenced assemblages at the macroscale, whereas microhabitat diversity dominated at the mesoscale.

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Murphy, Nicholas P., i Christopher M. Austin. "Phylogeography of the widespread Australian freshwater prawn, Macrobrachium australiense (Decapoda, Palaemonidae)". Journal of Biogeography 31, nr 7 (lipiec 2004): 1065–72. http://dx.doi.org/10.1111/j.1365-2699.2004.01105.x.

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Torkkola, Janne J., i Donna W. Hemsley. "Prawn parade: notes on Macrobrachium australiense Holthius, 1950 climbing vertical concrete overflow steps at Gold Creek Reservoir, Queensland". Marine and Freshwater Research 70, nr 10 (2019): 1480. http://dx.doi.org/10.1071/mf18362.

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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.

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Cresswell, Tom, Stuart L. Simpson, Ross E. W. Smith, Dayanthi Nugegoda, Debashish Mazumder i John Twining. "Bioaccumulation and retention kinetics of cadmium in the freshwater decapod Macrobrachium australiense". Aquatic Toxicology 148 (marzec 2014): 174–83. http://dx.doi.org/10.1016/j.aquatox.2014.01.006.

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Dimmock, A., I. Williamson i P. B. Mather. "The Influence of Environment on the Morphology of Macrobrachium australiense (Decapoda: Palaemonidae)". Aquaculture International 12, nr 4/5 (2004): 435–56. http://dx.doi.org/10.1023/b:aqui.0000042140.48340.c8.

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Price, Amina E., i Paul Humphries. "The role of dispersal and retention in the early life stages of shrimp in a lowland river". Canadian Journal of Fisheries and Aquatic Sciences 67, nr 4 (kwiecień 2010): 720–29. http://dx.doi.org/10.1139/f10-015.

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This study investigated the importance of dispersal and retention processes during early ontogeny for three caridean shrimp species that complete their entire life history in freshwater. Directional traps were used to examine the small-scale movement patterns of shrimp into and out of nursery habitat patches (slackwaters) in a small lowland river in southeastern Australia. Movement patterns provided evidence for two contrasting life history based dispersal and retention strategies. For the two smaller atyid species, Paratya australiensis and Caridina mccullochi , the majority of larvae remained within the slackwater in which they were hatched until the final stage of development, at which point dispersal, either among slackwaters or out of slackwaters to faster-flowing pool and run habitats, occurred. For the larger palaemonid species, Macrobrachium australiense , larvae were hatched into slackwaters and dispersal occurred predominately during the first stage of larval development and then decreased as development progressed. Despite the differences in dispersal strategies among species, movement was mostly associated with a particular larval stage and thus emphasizes the importance of retention during critical developmental periods and of the potential impact that flow alteration could have on these and other species with similar life histories.

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Kelleway, Jeff, Debashish Mazumder, G. Glenn Wilson, Neil Saintilan, Lisa Knowles, Jordan Iles i Tsuyoshi Kobayashi. "Trophic structure of benthic resources and consumers varies across a regulated floodplain wetland". Marine and Freshwater Research 61, nr 4 (2010): 430. http://dx.doi.org/10.1071/mf09113.

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Riverine food webs are often laterally disconnected (i.e. between watercourses) in regulated floodplain wetlands for prolonged periods. We compared the trophic structure of benthic resources and consumers (crustaceans and fish) of the three watercourses in a regulated floodplain wetland (the Gwydir Wetlands, Australia) that shared the same source water but were laterally disconnected. The crustaceans Cherax destructor (yabby), Macrobrachium australiense (freshwater prawn), the exotic fish Cyprinus carpio (European carp) and Carassius auratus (goldfish) showed significantly different δ13C values among the watercourses, suggesting spatial differences in primary carbon sources. Trophic positions were estimated by using δ15N values of benthic organic matter as the base of the food web in each watercourse. The estimated trophic positions and gut contents showed differences in trophic positions and feeding behaviours of consumers between watercourses, in particular for Melanotaenia fluviatilis (Murray–Darling rainbowfish) and M. australiense. Our findings suggest that the observed spatial variation in trophic structure appears to be largely related to the spatial differences in the extent and type of riparian vegetation (i.e. allochthonous carbon source) across the floodplain that most likely constituted part of the benthic resources.

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Cook, Benjamin D., Stuart E. Bunn i Jane M. Hughes. "Genetic structure and dispersal of Macrobrachium australiense (Decapoda: Palaemonidae) in western Queensland, Australia". Freshwater Biology 47, nr 11 (25.10.2002): 2098–112. http://dx.doi.org/10.1046/j.1365-2427.2002.00953.x.

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Masci, Kate D., Mark Ponniah i Jane M. Hughes. "Patterns of connectivity between the Lake Eyre and Gulf drainages, Australia: a phylogeographic approach". Marine and Freshwater Research 59, nr 9 (2008): 751. http://dx.doi.org/10.1071/mf07178.

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Historical barriers to dispersal in freshwater environments can be detected in the genetic structure of organisms living within these environments. Over time, it is possible that a barrier for freshwater organisms becomes passable, allowing gene flow between adjacent populations. The Lake Eyre and Gulf of Carpentaria Basins are adjacent drainages in northern Queensland. Low topography and large-scale flooding events make it possible that connectivity events may have occurred between the drainages throughout history. Documented geological evidence also suggests historical connectivity between the basins in the Pliocene. The present study looked at two widely distributed species, the freshwater fish Nematalosa erebi and the freshwater prawn Macrobrachium australiense, and used mitochondrial sequence data to assess past connectivity between the basins and estimate the timing of these events. Both species showed significant divergence across the drainage divide. There was evidence of two fragmentation events in the N. erebi data and divergence estimates for these events were 160 000 and 350 000 years ago. It was estimated that there has been no dispersal of M. australiense across the drainage divide for over one million years. The discordant evolutionary histories observed suggest that the patterns reflect recent historical environmental events and life-history differences between the two species.

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Costa, Vincenzo A., Jemma L. Geoghegan, Edward C. Holmes i Erin Harvey. "Genetic Reassortment between Endemic and Introduced Macrobrachium rosenbergii Nodaviruses in the Murray-Darling Basin, Australia". Viruses 14, nr 10 (4.10.2022): 2186. http://dx.doi.org/10.3390/v14102186.

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Macrobrachium rosenbergii nodavirus (MrNV)—the aetiological agent of white tail disease—is a major limiting factor of crustacean aquaculture as it causes up to 100% mortality in M. rosenbergii larvae and juveniles. Despite the importance of MrNV, there have been few studies on the phylogenetic diversity and geographic range of this virus in Australian waterways. Here, we detected MrNV genomes in common carp (Cyprinus carpio) metatranscriptomes sampled at five freshwater sites across the Murray-Darling Basin (MDB), Australia. We identified genetic divergence of the RNA-dependent RNA polymerase gene between MrNV sequences identified in the northern and southern rivers of the MDB. Northern viruses exhibited strong phylogenetic clustering with MrNV from China, whereas the southern viruses were more closely related to MrNV from Australia. However, all five viruses were closely related in the capsid protein, indicative of genetic reassortment of the RNA1 and RNA2 segments between Australian and introduced MrNV. In addition, we identified Macrobrachium australiense in two of the five MrNV-positive libraries, suggesting that these species may be important reservoir hosts in the MDB. Overall, this study reports the first occurrence of MrNV outside of the Queensland region in Australia and provides evidence for genetic reassortment between endemic and introduced MrNV.

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Moshtaghi, Azam, Md Lifat Rahi, Viet Tuan Nguyen, Peter B. Mather i David A. Hurwood. "A transcriptomic scan for potential candidate genes involved in osmoregulation in an obligate freshwater palaemonid prawn (Macrobrachium australiense)". PeerJ 4 (5.10.2016): e2520. http://dx.doi.org/10.7717/peerj.2520.

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BackgroundUnderstanding the genomic basis of osmoregulation (candidate genes and/or molecular mechanisms controlling the phenotype) addresses one of the fundamental questions in evolutionary ecology. Species distributions and adaptive radiations are thought to be controlled by environmental salinity levels, and efficient osmoregulatory (ionic balance) ability is the main mechanism to overcome the problems related to environmental salinity gradients.MethodsTo better understand how osmoregulatory performance in freshwater (FW) crustaceans allow individuals to acclimate and adapt to raised salinity conditions, here we (i), reviewed the literature on genes that have been identified to be associated with osmoregulation in FW crustaceans, and (ii), performed a transcriptomic analysis using cDNA libraries developed from mRNA isolated from three important osmoregulatory tissues (gill, antennal gland, hepatopancreas) and total mRNA from post larvae taken from the freshwater prawn,Macrobrachium australienseusing Illumina deep sequencing technology. This species was targeted because it can complete its life cycle totally in freshwater but, like manyMacrobrachiumsp., can also tolerate brackish water conditions and hence should have genes associated with tolerance of both FW and saline conditions.ResultsWe obtained between 55.4 and 65.2 million Illumina read pairs from four cDNA libraries. Overall, paired end sequences assembled into a total of 125,196 non-redundant contigs (≥200 bp) with an N50 length of 2,282 bp and an average contig length of 968 bp. Transcriptomic analysis ofM. australienseidentified 32 different gene families that were potentially involved with osmoregulatory capacity. A total of 32,597 transcripts were specified with gene ontology (GO) terms identified on the basis of GO categories. Abundance estimation of expressed genes based on TPM (transcript per million) ≥20 showed 1625 transcripts commonly expressed in all four libraries. Among the top 10 genes expressed in four tissue libraries associated with osmoregulation, arginine kinase and Na+/K+- ATPase showed the highest transcript copy number with 7098 and 660, respectively in gill which is considered to be the most important organ involved in osmoregulation.DiscussionThe current study provides the first broad transcriptome fromM. australienseusing next generation sequencing and identifies potential candidate genes involved in salinity tolerance and osmoregulation that can provide a foundation for investigating osmoregulatory capacity in a wide variety of freshwater crustaceans.

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Lammers, Jan H., Bronwen W. Cribb i Kevin Warburton. "Anti-Predator Strategies in Relation to Diurnal Refuge USAge and Exploration in the Australian Freshwater Prawn, Macrobrachium Australiense". Journal of Crustacean Biology 29, nr 2 (1.01.2009): 175–82. http://dx.doi.org/10.1651/08-3043r.1.

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Carini, G., i J. M. Hughes. "Population structure of Macrobrachium australiense (Decapoda: Palaemonidae) in Western Queensland, Australia: the role of contemporary and historical processes". Heredity 93, nr 4 (25.08.2004): 350–63. http://dx.doi.org/10.1038/sj.hdy.6800510.

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Dwyer, Georgia K., Rick J. Stoffels, Ewen Silvester i Gavin N. Rees. "Prey amino acid composition affects rates of protein synthesis and N wastage of a freshwater carnivore". Marine and Freshwater Research 71, nr 2 (2020): 229. http://dx.doi.org/10.1071/mf18410.

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Humans modify prey communities and hence alter the availability of nutrients to wild carnivores. Such changes in amino acid ‘landscapes’ are likely to affect the growth of individuals, and potentially the success of populations. This study aimed to determine whether amino acid composition of animal prey alone affects protein synthesis efficiency and N wastage of a freshwater carnivore. River blackfish (Gadopsis marmoratus) were fed two diets differing only in amino acid composition: the first diet was formulated to match the composition of the fish themselves, representing a balanced ‘ideal protein’, whereas the second diet was produced to match the composition of a prey item, namely the shrimp Macrobrachium australiense. By measuring the postprandial increase in metabolic rate (specific dynamic action) and ammonia excretion, it was found that the amino acid composition of the fish diet was associated with an increase in protein synthesis, whereas the shrimp diet doubled the amount of dietary amino acids directed to pathways of catabolic energy production and N wastage. This study adds to the stoichiometric ecology literature by showing that changes in the amino acid composition of food webs could affect carnivore growth and nutrient cycling.

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Cresswell, Tom, Debashish Mazumder, Paul D. Callaghan, An Nguyen, Michael Corry i Stuart L. Simpson. "Metal Transfer among Organs Following Short- and Long-Term Exposures Using Autoradiography: Cadmium Bioaccumulation by the Freshwater Prawn Macrobrachium australiense". Environmental Science & Technology 51, nr 7 (24.03.2017): 4054–60. http://dx.doi.org/10.1021/acs.est.6b06471.

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Moshtaghi, Azam, Md Lifat Rahi, Peter B. Mather i David A. Hurwood. "An investigation of gene expression patterns that contribute to osmoregulation in Macrobrachium australiense: Assessment of adaptive responses to different osmotic niches". Gene Reports 13 (grudzień 2018): 76–83. http://dx.doi.org/10.1016/j.genrep.2018.09.002.

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Moshtaghi, Azam, Md Lifat Rahi, Peter B. Mather i David A. Hurwood. "Understanding the Genomic Basis of Adaptive Response to Variable Osmotic Niches in Freshwater Prawns: A Comparative Intraspecific RNA-Seq Analysis of Macrobrachium australiense". Journal of Heredity 108, nr 5 (6.05.2017): 544–52. http://dx.doi.org/10.1093/jhered/esx045.

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Walsh, C. J., i B. D. Mitchell. "Factors associated with variations in abundance of epifaunal caridean shrimps between and within estuarine seagrass meadows". Marine and Freshwater Research 49, nr 8 (1998): 769. http://dx.doi.org/10.1071/mf97101.

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The patterns of abundance of epifaunal caridean shrimps in seagrass meadows of the Hopkins River estuary, south-western Victoria, Australia were described, and environmental factors that best explained abundance patterns were sought at two scales: within and between meadows. The abundances of the three species, Macrobrachium intermedium, Paratya australiensis and Palaemon serenus, were strongly related to the position of meadows within the estuary. Patterns of abundance between meadows were likely to be determined by distribution of larval recruits, and extent of post- larval migration, both between meadows and to and from stocks outside the estuary (the river upstream for Paratya, and adjacent coastal waters for Macrobrachium and Palaemon). Variation in caridean abundances over 1 year was related to temperature and salinity. Patterns of recruitment and migration could in part be explained by physiological responses to physico-chemical changes. However, it is hypothesized that competitive exclusion from preferred deeper parts of meadows is a trigger for migration of Paratya from the estuary. Although caridean densities within some meadows were at times correlated with seagrass biomass, patterns of seagrass abundance did not explain between-meadow patterns of caridean abundance well.

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Tan, Mun Hua, Han Ming Gan, Yin Peng Lee, Gary C. B. Poore i Christopher M. Austin. "Digging deeper: new gene order rearrangements and distinct patterns of codons usage in mitochondrial genomes among shrimps from the Axiidea, Gebiidea and Caridea (Crustacea: Decapoda)". PeerJ 5 (1.03.2017): e2982. http://dx.doi.org/10.7717/peerj.2982.

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BackgroundWhole mitochondrial DNA is being increasingly utilized for comparative genomic and phylogenetic studies at deep and shallow evolutionary levels for a range of taxonomic groups. Although mitogenome sequences are deposited at an increasing rate into public databases, their taxonomic representation is unequal across major taxonomic groups. In the case of decapod crustaceans, several infraorders, including Axiidea (ghost shrimps, sponge shrimps, and mud lobsters) and Caridea (true shrimps) are still under-represented, limiting comprehensive phylogenetic studies that utilize mitogenomic information.MethodsSequence reads from partial genome scans were generated using the Illumina MiSeq platform and mitogenome sequences were assembled from these low coverage reads. In addition to examining phylogenetic relationships within the three infraorders, Axiidea, Gebiidea, and Caridea, we also investigated the diversity and frequency of codon usage bias and mitogenome gene order rearrangements.ResultsWe present new mitogenome sequences for five shrimp species from Australia that includes two ghost shrimps,Callianassa ceramicaandTrypaea australiensis, along with three caridean shrimps,Macrobrachium bullatum,Alpheus lobidens, andCaridinacf.nilotica. Strong differences in codon usage were discovered among the three infraorders and significant gene order rearrangements were observed. While the gene order rearrangements are congruent with the inferred phylogenetic relationships and consistent with taxonomic classification, they are unevenly distributed within and among the three infraorders.DiscussionOur findings suggest potential for mitogenome rearrangements to be useful phylogenetic markers for decapod crustaceans and at the same time raise important questions concerning the drivers of mitogenome evolution in different decapod crustacean lineages.

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Shamsi, Shokoofeh, Lachlan Sibraa, Xiaocheng Zhu i Diane P. Barton. "Characterisation of Temnocephalidae flatworms in common Australian freshwater prawn, Macrobrachium australiense". Scientific Reports 12, nr 1 (26.01.2022). http://dx.doi.org/10.1038/s41598-022-05123-z.

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AbstractMacrobrachium australiense, is one of Australia’s most widespread freshwater invertebrates. Although a significant amount of research has been conducted to understand the diversity of crustacean species in Australia, there has been considerably less effort focused on their Temnocephalidae symbionts. The present study aims to identify Temnocephalidae species found in M. australiense, along with determining their impacts on the fitness of their hosts. A total of 54 M. australiense (common Australian river prawn) were examined for evidence of infection with Temnocephalidae species, of which 96.3% showed at least one sign of infection with Temnocephalidae. Due to damage and immaturity of the worms collected from, they have been referred to as Temnocephalidae sp. based on the presence of tentacles on the anterior margin of the body, and pedunculate sucker located dorsally on the ventral surface. Possible mechanical damage to gill lamellae resulting from either egg deposition or autolysis is evident. In the phylogenetic tree built based on sequences of the 28S rRNA gene, specimens in the present study grouped separately from other Temnocephalidae species reported from Australia.

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Reis, G. A., A. A. Olayeri, A. O. Saba, T. E. Falebita, F. O. Alonge, T. O. Abdulkareem, T. F. Giwa, A. O. Mudashiru i U. O. Jibrin-yekini. "Heavy Metals and their Effects on Macroinvertebrates Present in the Ojo River, Lagos, Nigeria". Asian Journal of Environment & Ecology, 17.06.2022, 22–29. http://dx.doi.org/10.9734/ajee/2022/v18i230310.

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Aim: To provide information regarding the presence of heavy metals in the tissues of crab (Potamon fluviatile), prawn (Macrobrachium rosenbergii), and crayfish (Metanephrops australiensis) obtained from the Ojo river of Lagos State, Nigeria. Study Design: Commercially sold marine crustacean samples (crab, prawn, and crayfish) obtained from the Ojo river of Lagos, Nigeria, were assessed for the presence of heavy metals, and also the potential health risks for local consumers. Place and Duration of Study: Ojo river, located close to Ojo local government secretariat, Ojo, Lagos State, Nigeria. Methodology: Live samples of macroinvertebrates such as Metanephrops australiensis, Potamon fluviatile, and Macrobrachium rosenbergii were purchased from the fishermen at the riverside in Ojo and immediately transferred to the laboratory. The samples were oven-dried and ground into a fine powder, then subjected to sample digestion and finally atomic absorption spectrophotometer (AAS), to obtain the various heavy metal concentrations present in each sample. Results: The result indicated variations in the metal body load among species. All the metals were below the FAO/WHO permissible limit for food consumption except for Cd in crayfish which was slightly beyond the set limit. The highest concentration examined were found in crayfish, followed by crab and prawn. Zinc and iron were of higher concentrations in the tissues of the macroinvertebrates while lead was the least concentrated metal present only in the tissues of crayfish and absent in the tissues of both crab and prawn. Conclusion: The human health risk evaluation for the marine organisms indicated that both the crab and the prawn samples examined were safe for consumption, while crayfish may not be considered safe for consumption. Also, the potential health risk from consuming seafood exposed to these metals should not be ignored.

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