Research Article |
Corresponding author: Giuseppe Fenu ( gfenu@unica.it ) Academic editor: Lorenzo Peruzzi
© 2017 Giuseppe Fenu, Giulio Ferretti, Matilde Gennai, Agustín Lahora, Antonio J. Mendoza-Fernández, Juan Mota, Jesús Robles, Lluís Serra, Hedwig Schwarzer, Pedro Sanchez-Gomez, Daniele Viciani, Simone Orsenigo.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Fenu G, Ferretti G, Gennai M, Lahora A, Mendoza-Fernández AJ, Mota J, Robles Sanchez J, Luis S, Schwarzer H, Sanchez-Gomez P, Viciani D, Orsenigo S (2017) Global and Regional IUCN Red List Assessments: 4. Italian Botanist 4: 61-71. https://doi.org/10.3897/italianbotanist.4.21595
|
In this contribution, the conservation status assessments of three vascular plants are presented following to IUCN categories and criteria. It includes the assessment at global level of Saxifraga caprariae Mannocci, Ferretti, Mazzoncini & Viciani and S. montis-christi Mannocci, Ferretti, Mazzoncini & Viciani and the regional assessment of Halocnemum cruciatum (Forssk.) Tod. (Spain).
Conservation, extinction risk, IUCN protocol, threats
The text of the global and regional assessment should be submitted electronically to Simone Orsenigo (simone.orsenigo@unimi.it) or to Giuseppe Fenu (gfenu@unica.it); text up to 8000 characters in length (space included) must include a distribution map and a picture of the assessed species.
Global Assessment
Taxonomy and nomenclature
Order: SaxifragalesFamily: Saxifragaceae
Saxifraga caprariae Mannocci, Ferretti, Mazzoncini & Viciani, Phytotaxa 284: 122. 2016.
Common name: Sassifraga di Capraia (It); Saxifrage of Capraia (En).
Geographic distribution range: S. caprariae (Fig.
Distribution: Country of occurrence: Italy
Biology: Plant growth form: perennial (hemicryptophyte)
Flowering time: Early spring (March to April)
Reproduction: No information on pollination, dispersal strategy and seed germination is available.
Habitat and Ecology: Saxifraga caprariae grows on volcanic rocks, on cliffs mainly exposed northwards between 250 and 350 m a.s.l. Soil is often thin, scarce or almost nonexistent, with a vegetation mainly consisting of mosses, lichens and small ferns (
Population information: A rough count in the three subpopulations on Capraia in 2015 gave totals of around 400 mature plants, however the number of individuals could be underestimated, because the areas where the individuals grow are not easily accessible and the species was only recently described. There is no detailed information available on population dynamics and trends.
Threats: 11.4 Storms & Flooding. Sporadic events of strong rainfalls could represent a threat, causing exceptional floods and landslides in the valleys where the species occurs.
CRITERIA APPLIED:
Criterion B: EOO: 4 km2 calculated with minimum convex hull in QGis 2.14
AOO: 4 km2 calculated with a 2 × 2 km cell fixed grid
a) The only plausible threat could be the sporadic events of exceptional rainfalls (more and more frequent due to climate change) causing floods and landslides with possible impacts on the subpopulations. Something similar could explain the reason why the species was not confirmed in the historical site of Mt. Castello.
b) The threat of sporadic heavy rainfall is not sufficient to expect a decline in AOO (ii), number of subpopulations (iv) or number of mature individuals (v).
Criterion D: Number of mature individuals: < 1000
Red List category and Criteria (Global Assessment)
VU Vulnerable D1
Rationale for the assessment: Saxifraga caprariae is an Italian endemic found only on Capraia Island. It occurs in three small sites on rocky volcanic cliffs. Although it has a restricted AOO and EOO, this plant is relatively well protected. The population comprises fewer than 1000 mature individuals. Based on the population size the species qualifies for listing as Vulnerable D1.
Previous assessment: Saxifraga caprariae was not evaluated (NE) previously (
Conservation actions: Saxifraga caprariae is not protected at regional, national or international level, due to the fact it was recently described (
Conservation actions needed: further monitoring and research are recommended in order to better understand the population trends of the species.
Daniele Viciani, Giulio Ferretti, Matilde Gennai
Global Assessment
Taxonomy and nomenclature
Order: SaxifragalesFamily: Saxifragaceae
Saxifraga montis-christi Mannocci, Ferretti, Mazzoncini & Viciani, Phytotaxa 284: 123. 2016
Common name: Sassifraga di Montecristo (It); Saxifrage of Montecristo (En).
Geographic distribution range: Saxifraga montis-christi (Fig.
Distribution: Country of occurrence: Italy
Biology: Plant growth form: perennial (hemicryptophyte)
Flowering time: Early spring (March to April)
Reproduction: No information on pollination, dispersal strategy and seed germination is available.
Habitat and ecology: Saxifraga montis-christi grows on acid igneous rocks, on cliffs mainly exposed northwards between 200 and 550 m a.s.l. Soil is often thin, scarce or almost nonexistent, with a vegetation mainly consisting of mosses, lichens and small ferns (
Population information: The species occurs on steep cliffs which are difficult to access. The total population is estimated to be fewer than 1,000 mature individuals. There is no detailed information available on population dynamics and trends.
Threats: 11.4 Storms & Flooding. It is possible to hypothesize that sporadic heavy rainfall events could lead to high flow in streams, resulting in landslides, in the small narrow valleys where this species occurs and this could constitute a threat to some subpopulations.
CRITERIA APPLIED:
Criterion B: AOO: 4 km2 calculated with a 2 × 2 km cell fixed grid
a) The species occurs on the largely inaccessible cliffs, inside a protected area, therefore the only plausible threat could be the sporadic events of exceptional rainfalls (more and more frequent due to climate change) causing floods and landslides with possible impacts on the subpopulations. Something similar could explain the reason why the species was not confirmed in the historical site between “Convento” and “Monte della Fortezza”.
b) The threat of the sporadic heavy rainfall events is not sufficient to expect a decline in AOO (ii), number of subpopulations (iv) or number of mature individuals (v).
Criterion D: Number of mature individuals: < 1000
Red List category and Criteria (Global Assessment)
VU Vulnerable D1
Rationale for the assessment: Saxifraga montis-christi is an Italian endemic species that is known only on Montecristo Island in the Tuscan Archipelago. It occurs in two small barely accessible sites on volcanic rocky cliffs in an uninhabited island, inside a National Park. The total number of mature individuals is fewer than 1,000. It is therefore assessed as Vulnerable D1.
Previous assessment: Saxifraga montis-christi was not evaluated (NE) previously (
Conservation actions: As it was only recently described (
Conservation actions needed: Further monitoring and research are recommended in order to better understand the population trends of the species.
Daniele Viciani, Giulio Ferretti, Matilde Gennai
Regional assessment (Spain)
Taxonomy and nomenclature
Order: CaryophyllalesFamily: Amaranthaceae
Halocnemum cruciatum (Forssk.) Tod. in Nuovo Giorn. Bot. Ital. 5(3): 159 (1873)
≡ Salicornia cruciata Forssk., Fl. Aegypt.-Arab.: 2 (1775) ≡ H. strobilaceum var. cruciatum (Forssk.) Moq. in DC., Prodr. 13(2): 149 (1849)
= H. strobilaceum auct. non (Pall.) M. Bieb., Fl. Taur.-Caucas. 3: 3 (1819)
Common name: Garbancillo (Sp), Hamd jointed glasswort (En), حطب أحمر، غدانه (غَدّانه) (Ar).
Geographic distribution range: Halocnemum cruciatum (Fig.
Distribution: Countries of occurrence: Algeria, Cyprus, Egypt, Israel, Italy, Jordan, Lebanon, Libya, Morocco, Saudi Arabia, Spain, Syria, Tunisia, Turkey and United Arab Emirates.
Biology: Plant growth form: perennial (nanophanerophyte).
Flowering and fruiting time: Flowering from August to September, fruiting from September to November.
Reproduction: By seed and vegetative propagation. Wind-pollinated. Seeds have no dispersal structures and germinate in the wet season (
Habitat and Ecology: Xerohalophyte (hyper-halophyte), growing on the margins of coastal and inland thermophilic salt marshes, on soils with high salt concentrations of the Frankenio corymbosae-Halocnemetum cruciati association (
Population information: In Almeria, 2,455 mature individuals were counted in 2004; the number declined to 220 and 201 individuals in 2006 and 2015, respectively, due to habitat destruction. In Murcia, the counts conducted in Calarreona in 2006 showed an approximate number of 1,500 individuals, even though there has been a continuous regression due to a loss of habitat quality related to the watertable increase; thus, the species only survives on the wetland margins. In the Guadalentin subpopulation, a direct count was made in 2015, with a total of 5,789 individuals; however, much of the original area was degraded and occupied by agricultural activities. In Alicante, the total number of individuals is much higher, although it has a scattered distribution and many patches have been lost due to habitat transformation for crops, urbanization or infrastructure. It has even been affected within protected natural areas by an increase in the duration of flood irrigation to favour the presence of birds. In Murcia, translocations and plantations have been carried out, with a survival rate higher than 90%.
Threats: 1.1 Housing & Urban areas: there is strong urban pressure on the coast.
1.2 Commercial & Industrial Areas: in Guadalentin and Albatera the habitat has been occupied by industrial estates.
1.3 Tourism & recreation areas: part of the coastal populations has been affected by resorts, golf courses, car parks and camping areas.
2.1 Annual & Perennial Non-Timber Crops: in Guadalentin and El Hondo, agriculture has occupied part of the species’ habitat.
2.3 Livestock Farming & Ranching: the Guadalentin subpopulation is affected by cattle trampling.
4.1 Roads & Railroads: all the subpopulations are located alongside roads or highways.
6.1. Recreational activities: tourism damages coastal populations, especially in the summer.
7.2 Dams & Water Management/Use: The Halocnemum halophytic vegetation has been replaced in some areas by formations of Phragmites, Sarcocornia, etc., due to changes in water flow patterns from their natural range.
9.4 Garbage & Solid Waste: There is dumping of debris and garbage in the salt marshes.
CRITERIA APPLIED:
Criterion A: There has been a more than 80% decrease in population size over the last 30 years which continues today. Both AOO and EOO have been reduced with destruction and loss of habitat quality.
Red List category and Criteria (Regional Assessment)
Critically Endangered CR A2ac
Rationale for the assessment: In Spain, Halocnemum cruciatum is restricted to three severely fragmented subpopulations. There has been a continuous decrease in population size, which currently continues, a reduction of AOO, and EOO and a loss of suitable habitats. Generation time is estimated at 10-12 years. The EOO (calculated with minimum convex polygon in QGIS 2.18) has declined from 4,480 km2 to 3,614 km2. The AOO (calculated with a 2 × 2 km cell fixed grid) has decreased from 180 km2 to 112 km2 in the last 30 years. Populations are threatened by urban, residential and industrial developments, roads, agriculture and cattle. Some patches are also affected by modification of flooded areas and waste dumping. For this reason, this plant is considered as Critically Endangered at a regional level (Spain).
Previous assessment: Critically Endangered [CR A2ac; B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v); C2a(ii)b] in
Conservation actions: Halocnemum cruciatum is protected at the regional level in Andalusia (23/2012 Decree), Murcia Region (50/2003 Decree) and Valencian Community (6/2013 Order). The Halocnemum vegetation is included in Annex I of the Habitats Directive, Mediterranean and thermo-Atlantic halophilous scrubs (code 1420). Much of Murcia’s and Alicante’s subpopulations are within natural protected areas.
Conservation actions needed: Protection of the patches in Andalusia. Habitat management and restoration. Seed collection and conservation in botanical gardens. Population reinforcement and reintroduction.
Notes: Recent taxonomic investigations confirm that H. cruciatum is a separate species from H. strobilaceum (Pall.) M.Bieb. (
Lahora Agustín, Mendoza-Fernández Antonio J., Robles Jesús, Serra Lluís, Schwarzer Hedwig, Sánchez-Gómez Pedro, Mota Juan.