![]() Amount of suitable habitat may decrease by ~30% by 2070 (Klamt et al.Estimated to cause local extinctions in approximately 40% of the platypus's range by 2070.Increased severity of droughts and floods (Grant 2015 Bino et al.River flooding during breeding season may displace young/juveniles from burrows, or some may drown (Serena et al.(Grant 2015 Woinarski and Burbidge 2016, except as noted) May show preference for undisturbed streams (see Koch et al.However, require specialized habitat and have limited dispersal ability (Klamt et al.Platypuses can show resiliency-survive and reproduce in degraded/modified habitats (Burbidge and McKenzie 1989 Grant 2007 Klamt et al.Stormwater runoff limits platypus distribution (Martin et al.See Booth and Connolly (2008) for discussion of PCBs.Contain debris and heavy metals (Woinarski and Burbidge 2016).Local populations strongly impacted by dam construction.Unlikely to re-colonize a river system without human intervention (Grant et al., personal communication, 2014, as cited in Woinarski and Burbidge 2016).Vulnerable to poor land and watershed management practices.Platypuses depend on streams, rivers, and bodies of freshwater (Grant 2015 Woinarski and Burbidge 2016 Bino et al.Habitat loss, degradation, and poor water quality Additional threatened species listings on state and federal schedules advised by Bino et al.Unlisted in other Australian states and nationally (Bino et al.Endangered status in South Australia (Grant 2015).Exports must be approved by the Federal Government.Zoos and sanctuaries required to hold special licenses.Platypuses cannot be collected or killed, except for scientific research.Legally protected in Australian Capital Territory and all Australian states where it occurs (Grant 2007 Grant 2015).Previous assessments (Woinarski and Burbidge 2016).(2020) suggest downgraded status of Vulnerable, given future drought and watershed regulation impacts Threats affect individuals and platypus habitat.Not thought to exceed 30% in the last three generations.Extent varies across the platypus’ range.Near Threatened (2014 assessment) (Woinarski and Burbidge 2016).Some river systems act as discrete population units (Kolomyjec et al.Populations of low genetic diversity (Furlan et al.Genetic evidence of connectivity between coastal and inland areas separated by the Great Dividing Range (Furlan et al.Regional differences among mainland platypuses (Kolomyjec et al.Little genetic differentiation within Tasmania.Reflects long-term isolation of Tasmania from mainland Australia.Platypuses in Tasmania/King Island genetically distinct from platypuses in mainland Australia (Furlan et al.May be transient, non-breeding individuals.Uncommon reports of platypuses in South Australia (Grant 2007).Local declines and extinctions reported, especially in urban and agricultural areas (Grant 1992).Large declines in Victoria and New South Wales (Grant 2015 Woinarski and Burbidge 2016).Population declines in all major mainland drainage basins (Hawke et al.Total population: declining (Woinarski and Burbidge 2016).Approximately 110 individuals (Furlan et al.Localized declines may go undetected (Gust and Griffiths 2010 Woinarski and Burbidge 2016).No study of nearly half of the platypus's potential range (Hawke et al.Lack of systematic, rigorous monitoring studies some recent initiatives beginning to change this.2012 Grant 2015 Woinarski and Burbidge 2016, except as noted) No robust estimates of total population size (except Kangaroo Island) (Furlan et al.Today's populations thought to number in the thousands or tens of thousands (Grant 2015).Platypus has experienced large declines since 1890s (Hawke et al.Until recently, considered common over much of its range (except South Australia) (Grant 2015), but growing evidence of higher risk of declines and local extinctions than previously thought (Bino et al.Abundance difficult to quantify (Woinarski and Burbidge 2016).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |