Quercus Ichnusae (Fagaceae), a New Species From Sardinia

Mossa, Luigi; Bacchetta, Gianluigi; Brullo, Salvatore

doi:10.1080/07929978.1999.10676774

Cited by 13 publications

(12 citation statements)

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“…In contrast, no specimens classifiable as Q. amplifolia were found even though, according to the phytosociological literature, this species should occur in at least 60% of the communities we sampled. Finally, we found specimens attributable to Q. pubescens (35) and Q. ichnusae (7) although the former species is considered to be absent in southern Italy and the latter endemic to Sardinia Island (Mossa et al 1999).…”

Section: Tablementioning

confidence: 95%

A multivariate morphometric analysis of diagnostic traits in southern Italy and Sicily pubescent oaks

et al. 2020

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Species identification within the species complex of Q. pubescens is a well-known taxonomic challenge among European botanists. Some of the specific pubescent oak binomials currently accepted in various European floras and checklists were originally described in Sicily and southern Calabria. As a consequence, several species belonging to the pubescent oaks group (Q. pubescens, Q. amplifolia, Q. congesta, Q. dalechampii, Q. leptobalana and Q. virgiliana) are reported in the taxonomic and phytosociological literature. To verify whether it was possible to associate a diverse set of morphological characters with each of these different taxa, thirteen natural populations of pubescent oak from Sicily and southern Calabria were sampled. A total of 391 trees, 3,887 leaves and 1,047 fruits were collected. Overall, 28 morphological characters of oak leaves and fruits were statistically analysed using univariate and multivariate procedures. The results showed that neither the groups of morphological diversity identified by cluster analysis, nor those obtained by our expert identification through the use of analytical keys, matched with the current taxonomical frameworks as proposed by the most recent floras and checklists. Nearly all of the morphological characters considered displayed a more or less continuous trend of variation, both within and among populations. In the light of these findings it seems unlikely that more than one biological species of pubescent oak occurs in Sicily and southern Calabria.

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Section: Tablementioning

confidence: 95%

A multivariate morphometric analysis of diagnostic traits in southern Italy and Sicily pubescent oaks

et al. 2020

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“…Sardinia, however, has remained little studied in this respect (Caccone et al, 1994;Capula, 1996;Marchi et al, 1996). Comprehensive information on the distribution and biogeography of Sardinian endemics is scarce, and new species are still being discovered, even in vertebrates (Rota, 1992;Gentili et al, 1998;Sabella et al, 1998;Selvi, 1998;Mossa et al, 1999;Bacchetta et al, 2000;Mucedda et al, 2002). Hence, we here give a brief overview of published data on the biogeography and phylogeography of Sardinian taxa.…”

Section: Biogeography and Phylogeographic History Of Sardinian Endemicsmentioning

confidence: 98%

Genetic differentiation and natural hybridization between the Sardinian endemicManiola nuragand the EuropeanManiola jurtina

Grill

Raijmann

Ginkel

et al. 2007

J of Evolutionary Biology

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The Mediterranean island of Sardinia is known for its multitude of unique genetic lineages. We view one of them in a larger phylogeographic context. The endemic Sardinian Meadow Brown butterfly, Maniola nurag, is restricted to the mountainous areas of the island, whereas its widespread close relative, Maniola jurtina, also occurs on the coast. At intermediate altitudes the species’ distributions overlap. There, a number of individuals exhibit phenotypic characteristics intermediate between the two species. We examined patterns of intra‐ and interpopulation variation in 10 M. nurag populations from Sardinia and 16 M. jurtina populations from Sardinia and continental Europe, as well as 17 intermediate individuals, sampled in 1999–2002, by means of allozyme markers, combining it with a morphometric analysis based on 18 wing‐characters of 52 males. At the 15 loci studied (aldolase, aat‐1, aat‐2, g6pdh, gpd, idh‐1, idh‐2, mdh‐1, mdh‐2, mpi, me, leu‐ala, pgi, pgm, and 6pgdh), 76 different alleles were detected, 63 of which were shared by M. nurag and M. jurtina. None of the loci was found to be alternatively fixed between the two species. In that respect, this study testifies to the difficulties that may arise when trying to identify hybrids from genotypic data. Levels of genetic variation in island populations (M. jurtina: HO = 0.137–0.189; M. nurag: HO = 0.141–0.270) were comparable to those of mainland M. jurtina (HO = 0.141–0.236). A Bayesian admixture analysis supported the hypothesis of mixed (hybrid) ancestry of individuals occurring at intermediate altitudes. Similarly, neighbour‐joining and unweighted pair‐group method with arithmetic averaging (UPGMA) analyses, as well as morphometrics hinted at the existence of a Maniola‐hybrid zone in Sardinia at intermediate altitudes. We discuss the results in the light of the phylogeography of other Sardinian taxa with the aim to reach a general understanding of the biogeographic history of this island's endemic species.

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“…Mossa et al (1998), viceversa, ne escludono la presenza individuando, attraverso l'analisi di caratteri morfologici, singole specie di querce a foglie caduche quali Q. lanuginosa Thuil., Q. congesta C. Presl, Q. virgiliana Ten., Q. amplifolia Guss., Q. dalechampii Ten. e Q. ichnusae (Mossa et al 1998, Mossa et al 1999, Bacchetta et al 2004, nonché vari ibridi tra queste.…”

Section: La Roverella (Quercus Pubescens Willd)unclassified

TheQuercus pubescensrelic forest on the Gennargentu Mountains (Sardinia, Italy)

Citterio¹,

Puxeddu²,

Giannini³

2007

Forest@

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The Quercus pubescens relic forest on the Gennargentu Mountains (Sardinia, Italy). The recent human impact has determined a strongly alteration of the Quercus pubescens forest on the Gennargentu Mountains in Sardinia. At the present, in this area the oak is represented by ancient single trees which can be considered relict and monumental individuals of the ancient forest. In this study, the space/time succession of oaks stands were analized in 1977 and 1997 years by GIS software and by multitemporal cartographic analyses. Some data about the stand structure are also reported.Keywords: Downy oak, Population, Human impact, Conservation, GIS, Multitemporal analysis. IntroduzioneLa conservazione della biodiversità è garanzia di benessere, progresso e sopravvivenza per le popolazioni umane presenti e per quelle future. Una diversificazione a livello di specie, di popolazione e di individuo può garantire una efficace conservazione della stabilità e dell'efficienza funzionale degli ecosistemi. Tale diversificazione offre anche la possibilità di superare impatti negativi dovuti alla comparsa di nuovi e imprevedibili fattori avversi.Tra ed entro le singole specie le dimensioni delle popolazioni variano nel tempo e nello spazio. Questo dinamismo è il risultato delle interazioni tra la storia evolutiva e la storia auto-ecologica di adattamento di ciascuna specie e non ultima l'azione antropica che ha portato ad alterazione, frammentazione e manomissione di molti ecosistemi terrestri. Nelle popolazioni isolate a basso effettivo 1 , la deriva genetica ricopre un ruolo dominante nella realizzazione della struttura genetica: in tempi brevi può essere causa di perdita di variabilità, con conseguente possibilità di estinzione a livello locale delle popolazioni stesse (Giannini & Raddi 2000). Nel caso di popolazioni di specie rare, in cui rientrano certamente le specie minacciate di estinzione e che spesso presentano come denominatore comune la ristrettezza geografica, oc-1-Effettivo: numero di individui capaci di differenziare gameti.corre analizzare la causa della rarità o del ridotto numero dell'effettivo stabilendo se tale situazione sia dovuta ad eventi catastrofici (incendio, pascolo, ecc.) o se invece perché quelle specie sono state sempre rare. Nel caso di catastrofi, le specie rappresentate da piccole popolazioni, possono risultare molto sensibili e vulnerabili agli effetti genetici deleteri da deriva in quanto si possono pensare come "non preparate".Una maggiore variabilità caratterizza le specie con areale ambientalmente diversificato. Non si può escludere il fatto che queste possiedano sistemi aggiustativi ovvero un maggiore potenziale adattativo che consente loro di superare le difficoltà e le avversità di un ambiente fluttuante, confermando la funzione tampone di un alto tasso di eterozigosità che è alla base della diversità.La persistenza di situazioni di pericolo dovrebbe essere di stimolo all'avvio di azioni di strategie di conservazione e in questo caso le informazioni genetiche, congiuntamente alla c...

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Quercus Ichnusae (Fagaceae), a New Species From Sardinia

Abstract: A new species of Quercus, Q. ichnusae, endemic to Sardinia is described and illustrated. Its distribution and relationships with the other deciduous oaks occurring on the island are examined.

Cited by 13 publications

References 1 publication

A multivariate morphometric analysis of diagnostic traits in southern Italy and Sicily pubescent oaks

A multivariate morphometric analysis of diagnostic traits in southern Italy and Sicily pubescent oaks

Genetic differentiation and natural hybridization between the Sardinian endemicManiola nuragand the EuropeanManiola jurtina

TheQuercus pubescensrelic forest on the Gennargentu Mountains (Sardinia, Italy)

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