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Sorbus franconica 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Rosales Rosaceae

Scientific Name: Sorbus franconica Bornm.
Taxonomic Source(s): Meyer, N. 2016. Validierung zweier bayerischer Sorbus-Arten, Sorbus algoviensis N.MEY. und Sorbus doerriana N.MEY., sowie Bemerkungen zur Validität von Sorbus badensis DÜLL, Sorbus pseudothuringiaca DÜLL, und Sorbus franconica BORNM. Berichte der Bayerischen Botanischen Gesellschaft 86: 227-230.
Taxonomic Notes: The species, an apomictic member of the S. latifolia L. complex, is thought to have originated from a hybridisation event between S. pannonica Karpati or S. aria (L.) Crantz and S. torminalis (L.) Crantz.

The species was validly described by Bornmüller in 1918. Düll’s later description from 1961 can be considered superfluous (Meyer 2016).

Assessment Information [top]

Red List Category & Criteria: Vulnerable D1 ver 3.1
Year Published: 2017
Date Assessed: 2016-05-04
Assessor(s): Beech, E., Meyer, N. & Rivers, M.C.
Reviewer(s): Salvesen, P.H. & Allen, D.J.
Justification:
Sorbus franconica is a shrub or small tree endemic to Bavaria in Germany. It is assessed as Vulnerable (VU D1) as there are approximately 500 known mature individuals. It has a restricted extent of occurrence of 436 km2. It is threatened by changes in forest management which promote natural succession reducing light available to this species.

Geographic Range [top]

Range Description:This species is endemic to Bavaria in southern Germany. The species is found between 450 and 520 m above sea level (N. Meyer pers. comm. 2016). The estimated extent of occurrence is 436 km2.
Countries occurrence:
Native:
Germany
Additional data:
Continuing decline in extent of occurrence (EOO):Unknown
Lower elevation limit (metres):450
Upper elevation limit (metres):520
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There are about 500 known mature individuals (N. Meyer pers. comm. 2016). The population is slowly declining.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:500Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:Unknown

Habitat and Ecology [top]

Habitat and Ecology:Sorbus franconica grows as a tree or shrub up to 6 m. It is found in open pine forest, rock outcrops and on the edges of deciduous forest (N. Meyer pers. comm. 2016).
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: The species is being propagated by the local botanic garden for use in compensation scheme to offset land destruction from development.

Threats [top]

Major Threat(s): Sorbus species in southern Germany are threatened by forest management changes. Where land was previously deforested or coppiced, providing perfect light conditions for Sorbus to flourish, however, this practice has now stopped. On the plains, pine forests were planted and also allowed light to the forest floor. However, both these areas are now being left to natural succession, leading to closed canopies of deciduous forests, restricting Sorbus to forest edges and rocky areas (N. Meyer pers. comm. 2016).

Conservation Actions [top]

Conservation Actions: This species is reported as held in two ex situ collections (BGCI 2016, N. Meyer pers. comm. 2016). This species was assessed as 3 E!!a in the Rote Liste der gefährdeten Gefäßpflanzen Bayerns (Scheuerer and Berg 2003). The species is being propagated by the local botanic garden for use in compensation scheme to offset land destruction from developmentContinued habitat management is necessary to keep the population stable.

Citation: Beech, E., Meyer, N. & Rivers, M.C. 2017. Sorbus franconica. The IUCN Red List of Threatened Species 2017: e.T34724A81171544. . Downloaded on 12 December 2017.
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