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Conservation Advice Geniostoma Huttonii a Shrub

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Conservation Advice Geniostoma Huttonii a Shrub The Minister approved this conservation advice on 18/06/2015 and included this species in the endangered category, effective from 26/06/2015 Conservation Advice Geniostoma huttonii A shrub Taxonomy Conventionally accepted as Geniostoma huttonii B. J. Conn (family Loganiaceae) Summary of assessment Conservation status Endangered: Criterion 4(b) Species can be listed as threatened under state and territory legislation. For information on the listing status of this species under relevant state or territory legislation, see http://www.environment.gov.au/cgi-bin/sprat/public/sprat.pl Reason for conservation assessment by the Threatened Species Scientific Committee This advice follows assessment of information provided by New South Wales as part of the process to systematically reviewing species that are inconsistently listed under the EPBC Act and relevant New South Wales legislation. Public Consultation Notice of the proposed amendment and a consultation document was made available for public comment for 35 business days between 27 November 2014 and 15 January 2015. Any comments received that were relevant to the survival of the species were considered by the Committee as part of the assessment process. Species/Sub-species Information Description Geniostoma huttonii is a scrambling shrub to 1 m tall. Stems furrowed between leaf bases, glabrous. Leaves with petiole 4–6 mm long; lamina ovate, 2–3 cm long, 1–1.6 cm broad, somewhat attenuate at base, entire, subacute to subaciminate, glabrous. Inflorescence less than 1 cm long, 1–3 flowered; pedicels c. 2 mm long; bracts c. 0.5 mm long. Calyx tube c. 0.5 mm long; lobes triangular, 1–1.5 mm long, shortly fimbriate, acute. Corolla tube 0.8–1 mm long; lobes 5 (sometimes 6), lanceolate, c. 2 mm long, acute, papillose in throat. Stamens inserted in throat; filaments c. 1 mm long, somewhat hairy at base; anthers ovoid, c. 0.5 mm long. Ovary ovoid, 0.5 mm long; style 0.2–0.6 mm long; stigma ellipsoidal, c. 0.3–0.7 mm long. Capsules globose-ellipsoidal, 5–6 mm diameter, green. Seeds not recorded. The species was only discovered in 1991. Distribution Endemic to Lord Howe Island on narrow, exposed ridges off the two mountain peaks in the southern mountains. The area of occupancy (AOO) and extent of occurrence are both estimated to be <8 km2 using 2 x 2 km grids (per IUCN guidelines). Geniostoma huttonii (a shrub) Conservation Advice Page 1 of 6 Relevant Biology/Ecology The specific ecological role of Geniostoma huttonii is not known. The species contributes to the endemic biodiversity of Lord Howe Island. The species is largely restricted to a particular habitat (i.e. narrow, exposed ridges (south- easterly or south-westerly facing) off the two mountain peaks in the southern mountains at around 500 m altitude. The species occurs amongst dense, stunted closed forest vegetation of Metrosideros nervulosa, Melicope polybotrya, Alyxia squamulosa, Olearia elliptica, Olearia ballii and Xylosma parvifolium. Hutton (2001, 2005) recorded 95 plants plus a small scattering in an area that could not be readily accessed. Plants recorded were stunted, scrambling shrubs and information is not recorded on the number of mature individuals. Population estimates were derived through survey and relocating known sites and used transects and habitat searches to estimate population size. A small number of additional plants are likely to occupy ridges in the southern mountains, however, based on potential habitat, this is likely to be less than 50–100 additional plants. This gives a reliable estimate of less than 250 mature plants. Threats Weeds are not known at any sites currently. Major weeds in similar habitats are Ageratina adenophora (Crofton weed), Pennisetum clandestinum (kikuyu grass), Bidens pilosa, Solanum nigrum and Lilium formosum (Tiger Lily). An assessment of the general threat caused by Crofton, Tiger Lily and Kikuyu is summarised from Hutton & Le Cussan (2001): Crofton Weed is currently the most widespread and potentially serious weed of the southern mountains. It grows in disturbed areas, moist sunny gullies and unstable steep slopes (>20%). It has infested many landslips on the mountains, and in some areas, forms monospecific, almost impenetrable stands over two metres in height. The mountain area undergoes periodic natural disturbance, so Crofton weed has the potential to invade many mountain slope areas over time. Available resources are unable to adequately manage current infestations. Tiger Lily infestations have increased dramatically over the past 10 years. It colonises a wide variety of habitats on Lord Howe Island, including cliffs and cliff ledges. Kikuyu grass is a major weed in coastal NSW. Kikuyu was planted in several areas in the southern mountains to stabilise walking tracks. It is spreading well beyond these locations. It poses a potential threat to Geniostoma huttonii, as its dense habit would compete with other plants. Ground Asparagus (Asparagus aethiopicus) is a potential major future threat to the species. Currently Ground Asparagus is widespread in the north of the island in extensive infestations in some areas such as Transit Hill. Some large plants occur on Intermediate Hill, and the weed may soon spread into the southern mountains (it is dispersed by birds and possibly rats). Island resources have not been able to keep pace with its spread and growth. Climate change and associated impacts (e.g. more frequent and intense storms, lower precipitation and higher temperatures) are likely to impact upon persistence and recruitment of the species. Geniostoma huttonii (a shrub) Conservation Advice Page 2 of 6 How judged by the Committee in relation to the EPBC Act Criteria and Regulations Criterion 1. Population size reduction (reduction in total numbers) Population reduction (measured over the longer of 10 years or 3 generations) based on any of A1 to A4 Critically Endangered Endangered Vulnerable Very severe reduction Severe reduction Substantial reduction A1 ≥ 90% ≥ 70% ≥ 50% A2, A3, A4 ≥ 80% ≥ 50% ≥ 30% A1 Population reduction observed, estimated, inferred or suspected in the past and the causes of the reduction (a) direct observation [except A3] are clearly reversible AND understood AND ceased. A2 Population reduction observed, estimated, inferred (b) an index of abundance appropriate to or suspected in the past where the causes of the the taxon reduction may not have ceased OR may not be based on understood OR may not be reversible. (c) a decline in area of occupancy, any of the extent of occurrence and/or quality of A3 Population reduction, projected or suspected to be following: habitat met in the future (up to a maximum of 100 years) [(a) cannot be used for A3] (d) actual or potential levels of A4 An observed, estimated, inferred, projected or exploitation suspected population reduction where the time period must include both the past and the future (up to a (e) the effects of introduced taxa, max. of 100 years in future), and where the causes of hybridization, pathogens, pollutants, reduction may not have ceased OR may not be competitors or parasites understood OR may not be reversible. Evidence: Insufficient data to determine eligibility The Committee considers that there is insufficient information to determine the eligibility of the species for listing in any category under this criterion. Criterion 2. Geographic distribution is precarious for either extent of occurrence AND/OR area of occupancy Critically Endangered Endangered Vulnerable Very restricted Restricted Limited B1. Extent of occurrence (EOO) < 100 km2 < 5,000 km2 < 20,000 km2 B2. Area of occupancy (AOO) < 10 km2 < 500 km2 < 2,000 km2 AND at least 2 of the following 3 conditions: (a) Severely fragmented OR Number of = 1 ≤ 5 ≤ 10 locations (b) Continuing decline observed, estimated, inferred or projected in any of: (i) extent of occurrence; (ii) area of occupancy; (iii) area, extent and/or quality of habitat; (iv) number of locations or subpopulations; (v) number of mature individuals (c) Extreme fluctuations in any of: (i) extent of occurrence; (ii) area of occupancy; (iii) number of locations or subpopulations; (number of mature individuals Evidence: Insufficient data to determine eligibility The area of occupancy (AOO) and extent of occurrence are both estimated to be <8 km2 using 2 x 2 km grids (per IUCN guidelines). The species occurs across three sites, all of these being within 2.2 km of each other and thus may be considered to be a single location. There are insufficient data to show a continuing decline or extreme fluctuations. Geniostoma huttonii (a shrub) Conservation Advice Page 3 of 6 The Committee considers that there is insufficient information to determine the eligibility of the species for listing in any category under this criterion. Criterion 3. Small population size and decline Critically Endangered Vulnerable Endangered Low Limited Very low Estimated number of mature individuals < 250 < 2,500 < 10,000 AND either (C1) or (C2) is true C1 An observed, estimated or projected Very high rate High rate Substantial rate continuing decline of at least (up to a 25% in 3 years or 1 20% in 3 years or 1 10% in 10 years or 3 max. of 100 years in future generation generation generations (whichever is longer) (whichever is (whichever is longer) longer) C2 An observed, estimated, projected or inferred continuing decline AND its geographic distribution is precarious for its survival based on at least 1 of the following 3 conditions: (i) Number of mature individuals in ≤ 50 ≤ 250 ≤ 1,000 each subpopulation (a) (ii) % of mature individuals in one 90 – 100% 95 – 100% 100% subpopulation = (b) Extreme fluctuations in the number of mature individuals Evidence: Insufficient data to determine eligibility The estimated total number of mature individuals is less than 250. The species occurs across three sites, all of these being within 2.2 km of each other and thus may be considered to be a single location.
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