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Plant Management on South Georgia Rosemary Newton

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Plant Management on South Georgia Rosemary Newton Plant management on South Georgia Rosemary Newton #SGSSIScience Image from South Georgia & the South Sandwich Islands Strategy 2016-2020 Grytviken whaling station – Agrostis capillaris invading native Festuca grassland Image: Bradley Myer Reindeer Image: MercoPress Eradication programme Brown rats Image: Paula O Sullivan SOUTH GEORGIA REINDEER ERADICATION Eradication programme Brown rats Image: Paula O Sullivan 2013 2014 Image: Cark Erik Kilander SOUTH GEORGIA RAT ERADICATION Eradication programme SOUTH GEORGIA REINDEER ERADICATION 2011 2013 2015 2013 2014 Image: Cark Erik Kilander Image: South Georgia Heritage Trust 41 NON-NATIVE PLANT SPECIES: control objective is A) eradication for the 33 species listed below; B) contain and reduce 4 species; C) targeted control to reduce spread of 3 widespread species; and D) research 1 species [35 HISTORIC SPECIES] Class 1 – High priority species requiring species led management (34 species) Class 2 – Species of moderate distribution, requiring site-led control (4 species) Class 3 – Species which are widespread and abundant (3 species) Research – More information required before classification (3 species) Historic – Historic species, not seen for at least 10 years (35 species) Strategy available at: http://www.gov.gs/docsarchive/environment/#tab-5 Programme delivery highly prioritised and strategic Cardamine glacialis distribution at KEP The South Georgia Non-Native Plant Management Programme is on track to achieve theImage: Strategy Indigena field team Targets Image:Indigena IndigenaBiosecurityfield team International: www.indigena.co.nz Managing Director: Bradley Myer ([email protected]: Indigena field team) Securing South Georgia’s native habitats following invasive species control (Darwin Plus) Durham Kew Indigena University Rosemary Newton Colin Clubbe Bradley Myer Kelvin Floyd Pamela Quilodrán Wayne Dawson Project leader Steering group Managing director Field team leader Field team member Invasion ecology chair and advisor & logistical support statistical expert Support Kaitalin White Marcella Corcoran Sally Poncet Ken Passfield Jörg Kluge QMUL MSc student Seed germination Field team member Field team member Field team member and horticulture GSGSSI Aim of Darwin Plus project is to safeguard South Georgia’s native habitats by: Image: Indigena Field Team Image: Indigena Field Team Image: iLaria Marengo Monitoring and assessing vegetation changes Estimating from soil seed bank viability studies the following non-native plant species control risk of non-native plant species persisting past 2020 Aim of Darwin Plus project is to safeguard South Georgia’s native habitats by: Image: Indigena Field Team © RBG Kew Quantifying the potential for non-native plant species Securing seed and fern spore collections of native to disperse into new areas following glacial retreat plant species for conservation in the Millennium due to climate change Seed Bank Laboratory work Seed and seedling imaging and dichotomous key Native: Montia fontana Non-native: Tripleurospermum inodorum 54 of 56 angiosperm species Laboratory work Seed extraction from soil Results: Number of sites investigated so far: 4 (5 reps per site) Total amount of soil processed: 20 samples of 20 ml each = 400 cm3 Total seeds / seed fragments extracted: > 600 items Total number of full seeds: 122 Total number of viable seeds: 51 Laboratory work Viable seeds in the soil 8.0 7.0 6.0 standard error) standard ± 5.0 Non-native: 4.0 Class 3 Native: Taraxacum Acaena magellanica officinale agg. 3.0 2.0 1.0 Mean number of viable seeds found ( found seedsviable of number Mean 0.0 SS KEP 01a-e SS KEP 02a-e SS KEP 03a-e SS KEP 08a-e Site Non-native: Unknown Unknown Poaceae Cerastium fontanum Taraxacum officinale agg. Native: Class 1 Deschampsia cespitosa Poa annua Montia fontana Ranunculus biternatus Ranunculus biternatus Deschampsia cespitosa Acaena magellanica Phleum alpinum Laboratory work Thermal gradient plate Image: Rosemary Newton Image: Rosemary Newton Image: Pablo Gomez-Barreiro Image: Colin Clubbe Field work 29 collections during 2018-2019 field season Native spore collections (11): Native seed collections (11): 1. Blechnum penna-marina (1) 1. Acaena magellanica x A. tenera (2) 2. Cystopteris fragilis (3) 2. Alopecurus magellanicus (1) 3. Grammitis poeppigeana (1) 3. Deschampsia antarctica (2) 4. Hymenophyllum falklandicum (1) 4. Festuca contracta (2) 5. Lycopodium magellanicum (1) 5. Juncus scheuchzerioides (2) 6. Ophioglossum opacum (1) 6. Poa flabellata (2) 7. Polystichum mohrioides (3) Non-native seed collections (7): 1. Deschampsia cespitosa (1) 4. Poa annua (2) 2. Deschampsia parvula (1) 5. Poa pratensis (2) 3. Festuca rubra (1) Outreach Updates on the programmeavailable at: http://www.gov.gs/docsarchive/environment/#tab-5 Image: Colin Clubbe Image: Colin Clubbe Any questions?.
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