A review of the biology of Australian halophilic anostracans (Branchiopoda: Anostraca)
© Timms; licensee BioMed Central Ltd. 2014
Received: 13 June 2014
Accepted: 30 October 2014
Published: 24 November 2014
Australia has two species of Artemia: A. franciscana introduced to salt works and apparently not spreading, and parthenogenetic Artemia presently spreading widely through southwestern Australia. In addition, and unique to Australia, there are 18 described species of Parartemia in hypersaline lakes. All Parartemia use a lock and key mechanism in amplexus and hence have distinctive antennal-head features in males and thoracic modifications in females. Various factors, including climatic fluctuations and isolation, contribute to a far higher diversity in the southwest of the continent. There are few congeneric occurrences of Parartemia possibly due to their consuming largely uniform allochthonous organic matter rather than multisized planktonic algae. In P. zietziana there are 2–3 cohorts a year each persisting 3–9 months. Up to 80% of assimilation is used in respiration and at times energy balance is negative, which accounts for its continuous mortality, inconsistent growth rates and unpredictable recruitment. Many species are as osmotically competent as Artemia, but are at a disadvantage in hypersaline waters >250 g L-1 as they lack the haemoglobin of Artemia. Parartemia acidiphila and P. contracta live in markedly acid waters to pH 3.5, where dissolved carbonate and bicarbonate are unavailable, and hence they must have evolved an additional proton pump to produce ATP from endogenous CO2. Occurrences of some species have been severely curtailed by lake salinisation (which includes acidification and changes in hydroperiod), so that their continued existence is in doubt. A few species of the otherwise freshwater Branchinella occur in mainly hyposaline waters.
KeywordsArtemia Branchinella Parartemia Taxonomy Ecology Physiology Conservation
Truly halophilic anostracans occur in two monogeneric families in the Artemiina, a major subdivision of the Anostraca. The Artemiidae contains Artemia, with six bisexual species and several parthenogenetic strains worldwide , whereas the Parartemiidae encompasses Parartemia, an Australian endemic genus of 18 described species . Australia has a plethora of anostracan species living in inland saline waters, more than any other continent, and besides these, there are many Branchinella, mainly in hyposaline waters . Naturally occurring Artemia exist in a few isolated lakes in coastal Western Australia near Perth , which may represent a parthenogenetic strain of one of the widespread Eurasian species . In addition, the New World Artemia franciscana Kellogg, 1906 has been introduced to Qld, SA and WA. These Australian halophilic species largely fill the niche of Artemia and Phallocryptus on other continents.
Realisation of the diversity of halophilic Anostraca is only recent, with most of the ecology of Parartemia being researched in Victoria on P. zietziana in the 1970s and most of taxonomy in the 1940s and since 2000. There has been no integrated account of Artemia and Parartemia in Australia since Williams & Geddes  and the situation now is quite different, especially with improved knowledge of Branchinella’s foray into saline waters and of conservation issues. It is the purpose of this review to bring the scattered published and grey literature together to provide an integrated ecology of brine shrimps in Australia. It will also reveal some major knowledge gaps.
Artemia in Australia
Over a century ago, three endemic species of Artemia were described from Australian waters. These were A. proxima King, 1855, A. westraliensis Sayce, 1903 (nomina nuda, see ) and A. australis Sayce, 1903 (nomen dubium, see ). The descriptions are inadequate and no material exists for A. proxima, which is surmised to be Artemia, but introduced on salt making equipment. The other two are a few distorted females in museums: the first is a Branchinella female, most of which are indistinguishable from one another, and the second is a Parartemia [7, 8].
Most information on Artemia (e.g. [1, 11]) comes from the northern hemisphere, though some studies include comparative data from Australia (e.g. [12–14]). Although the large salt works in northwest Australia monitor Artemia activity (M. Coleman, pers. comm.), there has been no published research. Before 1975, little was known on Artemia and Parartemia in Australia, which Geddes & Williams tried to redress [6, 15–17] with comparisons of Artemia and the local Parartemia, but at the time Artemia was not spreading and the high biodiversity and physiology of Parartemia were unknown.
It was not until 1903 that the first species of Parartemia (as P. zietziana, Sayce) was described ; any brine shrimp encountered before this date was thought to be Artemia (see above). In 1910, Daday  placed it in its own family, but it then spent more than 90 years in the family Branchipodidae until Weekers et al. , using molecular techniques, showed it to be a family in its own right, which vicariates with the Artemiidae and indeed is its sister group.
List of species of Parartemia and their gross distribution (from )
P. acidiphila 
Esperance hinterland and northeast Eyre Peninsula
P. auriciforma 
Inland northwest SA
P. boomeranga 
Inner northwestern Wheatbelt, WA
P. bicorna 
Lake Carey in northern Goldfields, WA
P. contracta 
Northern, central and southern Wheatbelt, WA
P. cylindifera 
Southern Wheatbelt WA, southern SA
P. extracta 
Northern and central Wheatbelt, WA
P. informis 
Northern and central Wheatbelt, WA
P. laticaudata 
Northwest and central inland WA, southwest NT
P. longicaudata 
Whole Wheatbelt, including Esperance, WA
P. minuta 
Inland Qld, western NSW, northeast SA, nw Vic
P. mouritzi 
Eastern Wheatbelt WA
P. purpurea 
Esperance hinterland, WA
P. serventyi 
Eastern Wheatbelt, southern Goldfields, WA
P. triquetra 
Remote northwest SA
P. veronicae 
P. yarleensis 
P. zietziana 
Southern SA, north and west Vic, central Tas
Parartemia species “e”
Lake Barlee, WA
All species use a lock and key mechanism in amplexus  with the male distal antennomeres locking around the female 11th thoracic segment or thereabouts and the anterior processes touching the female dorsa of thoracic segments 10 and 9 and maybe more depending on whether female segments are shortened by contraction and the length the male anterior processes. The female 11th thoracopod is greatly reduced to facilitate this coupling. Keys to Parartemia species utilize these secondary sex characteristics .
In a sense it is a puzzle why Parartemia utilizes lock and key amplexus when congeneric occurrences are rare, so the need for preventing hybridisation is almost nil. However many species often occur in adjacent lakes in WA and SA, and it is possible eggs may perhaps disperse outside their own lake into a nearby lake with a different species. In this case, competitive exclusion would be served by the incumbent species being unable to mate in the first instance without wasting scarce resources (see below) on unfit hybrids.
Lengths and salinity tolerance of Parartemia (from )
Seasonal lakes in Southern Australia
Episodic lakes in Inland Australia
Male length (mm)
Salinity tolerance (g L -1)
Male length (mm)
Salinity tolerance (g L -1)
In the Dry Creek Saltfield near Adelaide, P. zietziana and parthenogenetic Artemia (recorded as A. salina in the study) co-occur; P. zietziana alone at 112–214 g L-1 and Artemia alone above 285 g L-1 while both in the same ponds between 214 and 285 g L-1 . While P. zietziana can osmoregulate above 285 g L-1, it is at a disadvantage compared to Artemia because it lacks haemoglobin (see above).
Most species of Parartemia live in alkaline waters, but three species, P. acidiphila, P. contracta, P. mouritzi, naturally live in acid waters, where carbonate and bicarbonate are not available. Conte & Geddes  showed that P. contracta must have evolved an additional proton pump to produce ATP from endogenous CO2 and perhaps also from dissolved CO2. Presumably, P. acidiphila living as it does in waters down to pH 3.5  is similarly endowed, but P. mouritzi may not be, as so far it has not been found below pH 6.2. Parartemia serventyi, though typically living in alkaline waters, can survive mildly acid conditions of secondary salinised waters (G. Janicke, pers. comm.), so perhaps it has similar physiological modifications. Survival mechanisms in acidified waters would obviously be a productive area for future investigations.
Artemia is cultured worldwide and also in Australia, and in the early 2000s attempts were made to culture Parartemia commercially. Securing eggs was a problem, as they sink and become secure in the bottom substrates, so that the ready collection of floating eggs as in Artemia was impossible. The larger species were tried but unsuccessfully as growth rates were low and erratic (A. Savage, pers. comm.). Perhaps if the smaller species of the remote inland (see below) were tried there may have been some success, but egg collection remains a problem.
In Victorian seasonal salinas, Parartemia zietziana hatches at 20–40 g L-1 as the sites fill in late autumn-winter, passes through 2–3 cohorts in late winter-spring and then dies as the salinity rises rapidly in late spring-early summer [36, 37]. Much the same probably applies to similar seasonal salinas in southern SA and WA but involving various species according to lake type and locality [34, 35, 38]. In the central inland, salt lakes fill episodically often in summer, and in the Paroo, P. minuta hatches at low salinities, grows and reproduces, passing through one or more generations and persists as long as salinities do not exceed its upper tolerance limit [3, 39].
Parartemia zietziana eats mainly organic matter stirred from the bottom  and it is assumed other species feed in the same way. If so, it explains why there is rarely more than one species per lake, as there is no opportunity for size selection of particles and hence partitioning the resource as in the case of Branchinella feeding on diatoms .
The various species of Parartemia exhibit a range of characteristic lengths (Table 2). In a superficial assessment not accounting for factors such as food supply, growth temperature and salinity (in high salinities less energy is available for growth, see below), species occurring in the more reliably filling and longer lasting salinas in southern Australia generally are larger than those occurring in the short hydroperiods of episodic lakes of the inland . How this is mediated is unknown, but it ensures species of the inland can mature early and reproduce before the site dries.
Marchant  in studying the energetics of P. zietziana in two lakes near Colac, Victoria (Pink: 80–240 g L-1; Cundare: 50 g L-1 to dry) assimilation was only 1631 kJ m-2 yr-1 in Pink Lake and 212 kJ m-2 yr-1 in Cundare. Pink Lake is of very low productivity  and Cundare probably even lower; allochthonous inputs appear to be the main source of energy . In both lakes, on average, respiration accounted for 60–80% of assimilation. However respiration was often greater than assimilation and this imbalance lead to continuous mortality, variable growth and unpredictable recruitment. Gross growth efficiency (i.e. production/assimilation) of 15–30% was in the same range for other anostracans, but net growth efficiency (i.e. production/consumption) of 5–12% was well reduced. Although Parartemia is well adapted to live in salt lakes, life is difficult.
While generally not being called brine shrimps, a few species of the freshwater genus Branchinella live in saline waters. Most notable among these is Branchinella simplex in salinas in the middle Goldfields of WA and B. buchananensis in some saline lakes in northwest NSW and inland Qld (Figure 1). The upper field salinity limit for B. simplex is 62 g L-1 and for B. buchananensis is 42 g L-1 . Other species have much lower upper limits: B. compacta 15.9 g L-1, B. papillata 14 g L-1, B. nana 13 g L-1, B. nichollsi 12 g L-1, B. erosa and B. hearnii 12 g L-1, B. australiensis 11.2 g L-1, B. affinis 6.7 g L-1 and B. frondosa 4.2 g L-1 (, unpublished data). The occurrence of these species of Branchinella in saline lakes is no accident and is part of the normal succession of species in the lakes in which they occur, e.g. B. buchananensis in Lake Gidgee, the Paroo , Branchinella hearnii in the Unicup lakes near Manjimup, southwest WA (R. Hearn, pers. comm.), B. nana, B. nichollsi and B. simplex in Arrow Lake near Kalgoorlie  and B. simplex in Lake Carey, WA (B. Datson, pers. comm.). In some cases as the Unicup series there is no local Parartemia adapted to hyposaline waters and the waters do not exceed low salinities but in other cases such as in Gidgee Lake and Lake Carey the lake eventually becomes hypersaline and Parartemia assumes dominance. There is probably no competition between Branchinella and Parartemia as each eats different foods (see above) and it is purely a matter of salinity tolerance determining which is dominant.
Geddes  showed B. australiensis and B. compacta to be osmoconformers and presumably this applies to other species of Branchinella living in hyposaline waters. However it would be remarkable if this was the survival mechanism for B. buchananensis and B. simplex in mesosaline and hypersaline waters, respectively. To date the episodic occurrence of these species in remote salinas has mitigated against the solving of their osmoregulatory mechanism.
Four of the hyposaline Branchinella, B. australiensis, B. compacta, B. erosa and B. hearnii, have modifications to their posterior thorax, possibly to enhance species recognition by the male or contribute to lock and key mating . Why these modifications should be almost confined to hyposaline species (one supposedly freshwater species, B. vosperi, has the posterior thorax modified) is unknown, but three (not B. hearnii) may come in contact with Parartemia which employs the lock and key mechanism in amplexus (see above), so they would be unable to connect in mating. In that B. vosperi was found within 100 m of hyposaline lakes with Parartemia, it is possible it also occurs in such lakes, but it was missed in totally inadequate collecting (author, unpublished data). By contrast, all freshwater species (except B. vosperi), despite common congeneric occurrences, lack female thoracic modifications, as according to this theory they never meet Parartemia.
Brine shrimps: conservation
A general perception is Parartemia spp. live in remote salt lakes well removed from human influences on the environment. This is not the case in the Western District of Victoria, Eyre Peninsula SA or the Wheatbelt of WA, where extensive land clearing is associated with grain farming, dairying or grazing. Also, some remote inland salt lakes are impacted by mining in WA.
In Victorian agricultural regions no change has been noted in the only species present, P. zietziana, possibly because its wide salinity tolerance masks changes in lake salinities. Certainly it now lives in Lake Corangamite where previous mesosaline conditions enabled predatory fish to survive. This change has been largely due to diversion of the main inflowing stream and hence an increase in salinity by evaporation . On Eyre Peninsula, SA, lakes are salinising and Timms  predicts P. cylindifera will be replaced by the more tolerant P. zietziana. In WA there is extensive salinisation of lakes, so that populations of Parartemia spp. have been lost in many lakes . The driving factors for this loss are not so much salinity increase, but associated acidification and changed hydrology from temporary seasonal to permanent waters . Also in WA, there are a few lakes in the Goldfields where saline groundwater is discharged from mining activity. Despite concerns this may be inimical to hyposaline communities , this is not the case at least in Lake Carey (M. Coleman, pers. comm.).
At the species level, there are concerns for five species. Parartemia boomeranga naturally occurred over a small area, and it seems all the lakes in this area are now too salinised to support it, while P. extracta’s distribution has shrunk as lakes in its domain salinised . These authors suggest both should be given an IUCN Vulnerable Status, but this has not been acted upon because of lack of sufficient evidence. In an effort to get such data for P. extracta, it seems it is safe in some core lakes in its distribution (A. Pinder, pers. comm.) and its known distribution has actually been expanded (author, unpublished data).
With just four known sites for P. mouritzi, two of which are mildly salinised, Timms et al.  suggested this be given local classification of WA DPAW Priority 1 species. Similarly, P. bicorna and the undescribed Parartemia sp. “e” occur in just one lake each, and a DPAW Priority 4 allocation is appropriate. These suggestions have not been acted upon because authorities want extensive field collections to prove these cases. This is difficult for extremely episodic and remote lakes. For instance, recently P. bicorna has been found in Lake Minigal (B. Datson, pers. comm) and Lake Ballard (R. Pedler, pers. comm.), both of which had filled for the first time in years and a collector had visited at a propitious time.
No recommendations have been made for species of Parartemia in other states, though they are considered safe enough in settled areas (Qld, NSW, Vic, Tas, SA) or their known occurrences are so remote (P. auriciforma, P. triquetra in SA, P. laticaudata in NT) that there are no concerns. The salt tolerant fairy shrimp, Branchinella buchananensis is considered endangered in New South Wales and under the Fisheries Management Act of 1994 it has been declared a vulnerable fish (!) species. It occurs in a few  known localities in the state and one of these contains an economic deposit of gypsum, which in the 1990s was proposed to be mined. The present owners of the lake are much more sympathetic to its ecology.
Australia has three genera and 32 species of anostracans in its saline lakes. The otherwise freshwater Branchinella is largely restricted to hyposaline waters. Most of its species probably osmoconform, but two at higher salinites may not. Native parthenogenetic Artemia is spreading into altered salinas, but introduced A. franciscana is not, despite predictions. Parartemia (19 species) generally hypo-osmoregulate almost as competently as Artemia but are restricted at very high salinities as they lack haemoglobin to function in the low oxygen environments. Populations can suffer continuous mortality through lack of food resources.
Mating in Parartemia is by lock and key amplexis, but why this should be so is not easily explained, given species almost never co-occur. Species are smaller where salinas have shorter hydrologies, perhaps an adaptation to increase the chances of maturation. The ecology of only one species has been extensively investigated; others may live differently, especially those in acid saline waters, an obvious gap in knowledge.
Many saline lakes in Australia are being modified, particularly in the Wheatbelt of WA, so that some species are at risk. Except for a species in NSW which has been designated a vulnerable fish (!), none has been protected, largely because authorities require more data and such are hard to get for species living in remote episodic sites.
New South Wales
International Union for Conservation of Nature
Department of Parks and Wildlife.
I thank Adrian Pinder, Bindy Datson, Geraldine Janicke, Ilias Kappas, Jim Lane, Mark Coleman, Peri Coleman, Reece Pedler and Roger Hearn for sharing their unpublished data with me or at conferences.
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