Little Pygmy Perch  |  

Specify if the threat is (give details of (what is the level past; current or potential) impact on whole of threat to the species or specific conservation of subpopulations) the species) Climate change Past; present and future Entire Extreme Projected drastic flow declines due to rainfall reduction will impact the amount and quality of both peak flow (breeding) habitat and baseflow (refuge) habitat.
The impact on climate change on the spawning migrations and by extension recruitment of sympatric species has recently been demonstrated (Beatty et al. 2014) to place enormous pressure on the species.
Water quality decline Past; present and future Entire Extreme Salinisation is the major threat which is highly likely to be exacerbated by future flow declines associated with climate change (particularly warmer temperatures and decreased dissolved oxygen).
Climate change (flow reductions; refuge pool loss).
Denmark River National 2012 2016 151 Denmark River intact Past Present Water quality Denmark salinity action plan has (including unnamed Park (incl. juveniles) riparian vegetation with decline (salinisation; nonpoint reversed salinisation trend in tributary) complex instream habitat; pollution (e.g. nutrients; the Denmark River. flows seasonally and pesticides) and associated Ongoing research into ecology contracts to a series of impacts). and distribution of the species. disconnected pools during Climate change (flow baseflow; water fresh (max.
Possible intra catchment translocation to neighbouring Climate change (flow tributaries with known baseflow reductions; refuge pool loss). refuges could expand EOO AOO.
Private instream habitat; flows pollution (e.g. nutrients; Education to prevent further Property seasonally and contracts to pesticides) and associated alien non native species a series of disconnected impacts). introductions releases to the pools during baseflow; Introduced species (Eastern wild. secondarily salinised (max. mosquitofish). recorded salinity 6.5 ppt) Addressing salinity in the Kent Climate change (flow River catchment (as has been Moombaki Creek land reductions; refuge pool loss). achieved in the Denmark for wildlife farmland with Catchment). some areas of intact Fire (knowledge gap but known riparian vegetation; flows to impact freshwater fishes Research to quantify future seasonally and contracts to elsewhere). population viabilities disconnected pools during (particularly salinity and Instream barriers. baseflow instream barriers temperature tolerances). (dams) present.
Climate change (flow reductions; refuge pool loss).
Climate change (lowered levels) with intact riparian groundwater; reduced Education to prevent further vegetation water fresh recharge). alien non native species (max. recorded salinity 6. introductions releases to the ppt) Fire (knowledge gap but known wild. to impact freshwater fishes elsewhere).
Research to determine Climate change (lowered distribution and population groundwater; reduced viabilities in neighbouring lakes recharge). (State Strategic NRM project Potential water abstraction 2012 2015 discovered this (groundwater). population).
Education to mitigate the this includes habitat; flows nutrients; pesticides) and risk of further alien species juveniles and seasonally and associated impacts). introductions. length at maturity contracts to a series of Introduced species (Eastern Required has not been disconnected pools Gambusia; pigs). quantified) during baseflow; Addressing salinisation in the Hay secondarily salinised Climate change (flow River catchment (as has been (max. recorded salinity reductions; refuge pool achieved in the Denmark 6.5 ppt) loss).
Climate change (flow reductions; refuge pool loss).
Denmark River 2012 2015 137 captured Denmark River intact National Past Present Water Current (incl. unnamed (Strategic State (N.B. this is an riparian vegetation Park quality decline (salinisation; Denmark salinity action plan has tributary) NRM Project) overestimation as with complex instream nonpoint pollution (e.g. reversed salinisation trend in the this includes habitat; flows nutrients; pesticides) and Denmark River. juveniles and seasonally and associated impacts). length at maturity contracts to a series of Ongoing research into ecology and Climate change (flow has not been disconnected pools distribution of the species. reductions; refuge pool quantified) during baseflow; water Education to mitigate the risk of loss). fresh (max. recorded further alien species introductions. salinity 6.5 ppt) Introduced species (Eastern Gambusia; pigs).
Water quality decline Research to quantify future (salinisation; nonpoint population viabilities (particularly pollution (e.g. nutrients; salinity and temperature pesticides) and associated tolerances).Possible intra impacts). catchment translocation to neighbouring tributaries with Climate change (flow known baseflow refuges could reductions; refuge pool expand EOO AOO. loss).
Past Present Water Current Ongoing research into Moombaki (Strategic State (N.B. this is an riparian vegetation Park; and quality decline (salinisation; ecology and distribution of the Creek) NRM Project) overestimation as with complex instream private nonpoint pollution (e.g. species. this includes habitat; flows property nutrients; pesticides) and Education to mitigate the risk of juveniles and seasonally and associated impacts). further alien species introductions. length at maturity contracts to a series of Introduced species (Eastern has not been disconnected pools Required Gambusia). quantified) during baseflow; Addressing salinity in the Kent River secondarily salinised Climate change (flow catchment (as has been achieved in (max. recorded salinity reductions; refuge pool the Denmark Catchment). 6.5 ppt) loss).
Climate change (flow reductions; refuge pool loss).
Park Past Present Current Ongoing research into (Strategic State captured on a ( 400 x 150 m at peak ecology and distribution of the Climate change (lowered NRM Project) single occasion water levels) with species. groundwater; reduced (November intact riparian recharge).
Climate change (lowered groundwater; reduced Research to determine distribution recharge). and population viabilities in neighbouring lakes (State Strategic Potential water abstraction NRM project 2012 2015 discovered (groundwater). this population).
The impact of climate change on the spawning migrations of sympatric species has recently been demonstrated (Beatty et al. 2014).
The impact of climate change on the spawning migrations of sympatric species has recently been demonstrated (Beatty et al. 2014).
The impact of climate change on the spawning migrations of sympatric species has recently been demonstrated (Beatty et al. 2014).
The impact of climate change on the spawning migrations of sympatric species has recently been demonstrated (Beatty et al. 2014).
The impact of climate change on the spawning migrations of sympatric species has recently been demonstrated (Beatty et al. 2014).However; rising salinity trends are reversible (e.g.
Section 7 Threats 7.1 Threats (detail how the species is being impacted; i.e. how severe; the extent; evidence of the impact) Threat Rating Extent Evidence Time period (past; present; future) Climate change Extreme Throughout Projected drastic flow declines projected Since the 1970s range due to rainfall reductions (Barron et al. future 2013) will impact the amount and quality of both peak flow (breeding) habitat and baseflow (refuge) habitat.
The impact of climate change on the spawning migrations and by extension recruitment of sympatric species has recently been demonstrated (Beatty et al. 2014).
Water quality Extreme Throughout Salinisation is the major threat which is Past 60 years decline (salinisation; range highly likely to be exacerbated by future ongoing Kent; Hay nonpoint pollution flow declines associated with climate (e.g. nutrients; change (particularly increased pesticides) and temperature; decrease dissolved oxygen). associated impacts) The water quality and riparian condition in the Kent and Hay Rivers has declined due to land clearing and associated salinisation in the upper catchments (Evans et al. 1995 Mayer et al. 2005).
Exploitation High Throughout Given the limited number of locations and Present; future. range low abundances of the species; it is vulnerable to collection for the aquarium trade. 7.2 Threats relevant to only a specific subpopulation or location (detail impact and why not species level threat) Instream barriers (ford on lower Mitchell River) may impede migratory movements during shoulder flow periods. 7.3 Exploitation of the species (detail how the species is currently exploited or may potentially be exploited) Given the limited number of locations and low abundances of the species; it is vulnerable to collection for the aquarium trade. 7.4 Key threatening processes under the EPBC Act (list all applicable) Land clearance Loss of climatic habitat caused by anthropogenic emissions of greenhouse gases Novel biota and their impact on biodiversity Predation; Habitat Degradation; Competition and Disease Transmission by Feral Pig 7.5 Threat abatement plans for Key Threatening Processes under the EPBC Act (list all applicable) Threat abatement plan for predation; habitat degradation; competition and disease transmission by feral pigs 7.6 Biological and ecological characteristics threatening to the survival of the species (i.e. low genetic diversity; semelparity (one reproduction event before death); foraging behaviour) Low abundance; apparent low reproductive potential; fragmented range; majority of the population 3 years of age; dry season AOO is limited to a small number of refuge pools.
Contamination of artificial water points with fire retardant chemicals is also a possibility in the Denmark catchment; although the impacts of these chemicals on the species are unknown.
Fire Past; present and future Entire Moderate The impact of increased frequency of fires on southwestern Australian fish is unknown.
Appendix A Fire (knowledge gap but known to impact freshwater fish elsewhere).
Fire (extraction from fire Appendix A fighting waterpoints; potential contamination with retardant chemicals; plus impacts of fire itself).
Fire (knowledge gap but known to impact freshwater fishes elsewhere).
Fire (knowledge gap but known Research to quantify to impact freshwater fishes phyiscochemical tolerances elsewhere). (particularly salinity and temperature).
Mitchell River (lower Fire (knowledge gap but Education to mitigate the risk of reaches) intact known to impact further alien species introductions. riparian vegetation; freshwater fishes Research to quantify future with complex instream elsewhere). population viabilities (particularly habitat; flows Instream barriers (ford on salinity and temperature seasonally and Mitchell River may partially tolerances). dessicates completely impede migrations in during baseflow; water shoulder flow periods). fresh (max. recorded salinity 6.5 ppt) Future Intact riparian Water quality decline vegetation; ephemeral (salinisation; nonpoint Mitchell River; pollution (e.g. nutrients; secondarily salinised pesticides) and associated (Hay River) impacts).
Fire (knowledge gap but known to impact freshwater fish elsewhere).
Fire (extraction from fire fighting waterpoints; potential contamination with retardant chemicals; plus impacts of fire itself).
Education to mitigate the risk of Moombaki Creek Fire (knowledge gap but further alien species introductions. land for wildlife known to impact farmland with some freshwater fishes Research to quantify future areas of intact riparian elsewhere). population viabilities (particularly vegetation; flows salinity and temperature Instream barriers. seasonally and tolerances). contracts to Future disconnected pools Water quality decline during baseflow (salinisation; nonpoint instream barriers pollution (e.g. nutrients; (dams) present. pesticides) and associated impacts).
Fire (knowledge gap but known to impact freshwater fishes elsewhere).
Education to mitigate the risk of 2014 sample) vegetation water further alien species introductions. fresh (max. recorded Fire (knowledge gap but salinity 6.5 ppt) known to impact Required freshwater fishes Ensuring adequate water levels in elsewhere).
Fire (knowledge gap but Research to quantify known to impact phyiscochemical tolerances freshwater fishes (particularly salinity and elsewhere). temperature).
Contamination of artificial water points with fire retardant chemicals is also a possibility in the Denmark catchment; although the impacts of these chemicals on the species are unknown.
Fire (knowledge gap Moderate Throughout Impact of increased frequency of fires on Past; present and but known to impact range south western Australian fishes is future. freshwater fishes unknown.

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