The (non) impact of invasive cane toads on freshwater crocodiles at Lake Argyle in tropical Australia
The most substantial (and to date, unexplained) heterogeneity in the impact of toxic cane toads (Rhinella marina) on the native fauna of tropical Australia involves freshwater crocodiles (Crocodylus johnstoni); some populations have experienced catastrophic mortality whereas others have been unaffec...
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| Veröffentlicht in: | Animal conservation 2012-04, Vol.15 (2), p.152-163 |
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| description | The most substantial (and to date, unexplained) heterogeneity in the impact of toxic cane toads (Rhinella marina) on the native fauna of tropical Australia involves freshwater crocodiles (Crocodylus johnstoni); some populations have experienced catastrophic mortality whereas others have been unaffected. A trend for higher impact in more arid areas suggests that Western Australian (Kimberley region) crocodile populations may be at high risk. We monitored crocodile densities and body sizes, and the spread of cane toads, at a large water body (Lake Argyle) in the eastern Kimberley. Toads arrived on the lakeshore in early 2009, and spread to cover > 300 km of lakeshore, and colonize all of the larger islands within a 24‐month period. Physical removal of > 10 000 toads by a community group depressed toad abundances, but only briefly. Spool‐tracking showed that toads moved extensively along the lakeshore (up to 90 m per night), often into floating vegetation in the lake. Crocodiles thus encountered toads (3–15% of crocodiles were |
| doi_str_mv | 10.1111/j.1469-1795.2011.00500.x |
| format | Article |
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A trend for higher impact in more arid areas suggests that Western Australian (Kimberley region) crocodile populations may be at high risk. We monitored crocodile densities and body sizes, and the spread of cane toads, at a large water body (Lake Argyle) in the eastern Kimberley. Toads arrived on the lakeshore in early 2009, and spread to cover > 300 km of lakeshore, and colonize all of the larger islands within a 24‐month period. Physical removal of > 10 000 toads by a community group depressed toad abundances, but only briefly. Spool‐tracking showed that toads moved extensively along the lakeshore (up to 90 m per night), often into floating vegetation in the lake. Crocodiles thus encountered toads (3–15% of crocodiles were < 2 m from a toad when sighted), and we recorded 36 cases of toads being seized by crocodiles. Nonetheless, crocodile mortality was rare, and crocodile numbers did not decrease through time, nor differ between toad‐infested versus toad‐free areas of the lake. Although ingestion of a single adult toad may be fatal to a freshwater crocodile, and the Lake Argyle crocodiles encounter and consume these toxic anurans, the population‐level impact of toad invasion has been trivial. Hence, the Lake Argyle crocodile population may not warrant immediate active management to reduce the impact of cane toads.</description><identifier>ISSN: 1367-9430</identifier><identifier>EISSN: 1469-1795</identifier><identifier>DOI: 10.1111/j.1469-1795.2011.00500.x</identifier><language>eng</language><publisher>London: Blackwell Publishing Ltd</publisher><subject>alien species ; Amphibia ; Anura ; Bufo marinus ; Crocodylus johnstoni ; ecological impact ; invasive species ; Lakes ; spatial heterogeneity</subject><ispartof>Animal conservation, 2012-04, Vol.15 (2), p.152-163</ispartof><rights>2011 The Authors. 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A trend for higher impact in more arid areas suggests that Western Australian (Kimberley region) crocodile populations may be at high risk. We monitored crocodile densities and body sizes, and the spread of cane toads, at a large water body (Lake Argyle) in the eastern Kimberley. Toads arrived on the lakeshore in early 2009, and spread to cover > 300 km of lakeshore, and colonize all of the larger islands within a 24‐month period. Physical removal of > 10 000 toads by a community group depressed toad abundances, but only briefly. Spool‐tracking showed that toads moved extensively along the lakeshore (up to 90 m per night), often into floating vegetation in the lake. Crocodiles thus encountered toads (3–15% of crocodiles were < 2 m from a toad when sighted), and we recorded 36 cases of toads being seized by crocodiles. Nonetheless, crocodile mortality was rare, and crocodile numbers did not decrease through time, nor differ between toad‐infested versus toad‐free areas of the lake. Although ingestion of a single adult toad may be fatal to a freshwater crocodile, and the Lake Argyle crocodiles encounter and consume these toxic anurans, the population‐level impact of toad invasion has been trivial. Hence, the Lake Argyle crocodile population may not warrant immediate active management to reduce the impact of cane toads.</description><subject>alien species</subject><subject>Amphibia</subject><subject>Anura</subject><subject>Bufo marinus</subject><subject>Crocodylus johnstoni</subject><subject>ecological impact</subject><subject>invasive species</subject><subject>Lakes</subject><subject>spatial heterogeneity</subject><issn>1367-9430</issn><issn>1469-1795</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNpdkE9v2zAMxY1hBZa1_Q4CdmkP9ijJtmyglyBrm2FBe2nTo0Db9KrEsTLJ-fftqyxFD-WFBPgewfeLIsYh4aF-LhKe5mXMVZklAjhPADKAZP8lGn0svoZZ5iouUwnfou_eLwC4KCQfRfT0Suyqt_01M6s11gOzLTP9Fr3ZEquxJzZYbDyzPWsd-dcdDuRY7WxtG9ORZziwGS6Jjd3fQ0fBywZn16bGjo03fnDYGbyIzlrsPF2-9_Po-e72aTKNZ4_3vyfjWWykkhBXvCoVFq2UBZZEFRBmSmKlqqbFGqocioo3OYDATHAhctGWokaCHMu2wVyeR1enu2tn_23ID3plfE1dF3LYjdccoCjSTEEWpD8-SRd24_rwneZZmhapAkiD6uak2oWsB712ZoXuEO7oI3y90EfG-shYH-Hr__D1Xo8n8zAEe3yyGz_Q_sOObqlzJVWmXx7utZj-mb_IX1M9l282T4kw</recordid><startdate>201204</startdate><enddate>201204</enddate><creator>Somaweera, R.</creator><creator>Shine, R.</creator><general>Blackwell Publishing Ltd</general><general>Wiley Subscription Services, Inc</general><scope>BSCLL</scope><scope>7SN</scope><scope>7SS</scope><scope>7ST</scope><scope>7U6</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H97</scope><scope>L.G</scope><scope>P64</scope><scope>RC3</scope><scope>H95</scope></search><sort><creationdate>201204</creationdate><title>The (non) impact of invasive cane toads on freshwater crocodiles at Lake Argyle in tropical Australia</title><author>Somaweera, R. ; Shine, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i3730-b1b97a8f338a9eeb0ea573ab7bdfac0b608b1d6002a5212262f92cae06a9fda63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>alien species</topic><topic>Amphibia</topic><topic>Anura</topic><topic>Bufo marinus</topic><topic>Crocodylus johnstoni</topic><topic>ecological impact</topic><topic>invasive species</topic><topic>Lakes</topic><topic>spatial heterogeneity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Somaweera, R.</creatorcontrib><creatorcontrib>Shine, R.</creatorcontrib><collection>Istex</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Environment Abstracts</collection><collection>Sustainability Science Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 3: Aquatic Pollution & Environmental Quality</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><jtitle>Animal conservation</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Somaweera, R.</au><au>Shine, R.</au><au>Garner, Trent</au><au>Blackburn, Tim</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The (non) impact of invasive cane toads on freshwater crocodiles at Lake Argyle in tropical Australia</atitle><jtitle>Animal conservation</jtitle><addtitle>Anim Conserv</addtitle><date>2012-04</date><risdate>2012</risdate><volume>15</volume><issue>2</issue><spage>152</spage><epage>163</epage><pages>152-163</pages><issn>1367-9430</issn><eissn>1469-1795</eissn><abstract>The most substantial (and to date, unexplained) heterogeneity in the impact of toxic cane toads (Rhinella marina) on the native fauna of tropical Australia involves freshwater crocodiles (Crocodylus johnstoni); some populations have experienced catastrophic mortality whereas others have been unaffected. A trend for higher impact in more arid areas suggests that Western Australian (Kimberley region) crocodile populations may be at high risk. We monitored crocodile densities and body sizes, and the spread of cane toads, at a large water body (Lake Argyle) in the eastern Kimberley. Toads arrived on the lakeshore in early 2009, and spread to cover > 300 km of lakeshore, and colonize all of the larger islands within a 24‐month period. Physical removal of > 10 000 toads by a community group depressed toad abundances, but only briefly. Spool‐tracking showed that toads moved extensively along the lakeshore (up to 90 m per night), often into floating vegetation in the lake. Crocodiles thus encountered toads (3–15% of crocodiles were < 2 m from a toad when sighted), and we recorded 36 cases of toads being seized by crocodiles. Nonetheless, crocodile mortality was rare, and crocodile numbers did not decrease through time, nor differ between toad‐infested versus toad‐free areas of the lake. Although ingestion of a single adult toad may be fatal to a freshwater crocodile, and the Lake Argyle crocodiles encounter and consume these toxic anurans, the population‐level impact of toad invasion has been trivial. Hence, the Lake Argyle crocodile population may not warrant immediate active management to reduce the impact of cane toads.</abstract><cop>London</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/j.1469-1795.2011.00500.x</doi><tpages>12</tpages></addata></record> |
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| issn | 1367-9430 1469-1795 |
| language | eng |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | alien species Amphibia Anura Bufo marinus Crocodylus johnstoni ecological impact invasive species Lakes spatial heterogeneity |
| title | The (non) impact of invasive cane toads on freshwater crocodiles at Lake Argyle in tropical Australia |
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