A survey aimed at studying the effects of hydrogen sulphide (H 2 S) on epiphytic lichen vegetatio... more A survey aimed at studying the effects of hydrogen sulphide (H 2 S) on epiphytic lichen vegetation was carried out at Acquapassante (Mt. Amiata, Central Italy). In 1992, lichen vegetation was surveyed using a sampling grid of ten units, on 18 chestnut trees along a transect from a chimney emitting H 2 S to c. 200 m in the direction of the prevailing winds. A Lichen Biodiversity Index (LBI) was calculated as the sum of the frequencies of all species present within the grid. The same survey was repeated five years later. Concentration Analysis was applied to describe the data structure, and Procrustes Analysis was used to verify the congruence between the ordinations of 1992 and 1997. The statistically significant linear and non-linear regressions found between environmental variables (distance of relevés from the chimney, bark pH, lichen biomass of selected foliose and fruticose species, total sulphur content of Evernia prunastri, Hypogymnia physodes, Parmelia sulcata and Ramalina fastigiata) and the position of the relevé points on the ordination axes suggest that species distribution along the transect is related to differences in H 2 S tolerance. However, some crustose species (Lecanora cf. conizaeoides, L. saligna and Scoliciosporum umbrinum) should be probably excluded from the computation of the LBI for monitoring purposes, as their optimum is in the immediate vicinity of the H 2 S source. 1999 The British Lichen Society
A survey aimed at studying the effects of hydrogen sulphide (H 2 S) on epiphytic lichen vegetatio... more A survey aimed at studying the effects of hydrogen sulphide (H 2 S) on epiphytic lichen vegetation was carried out at Acquapassante (Mt. Amiata, Central Italy). In 1992, lichen vegetation was surveyed using a sampling grid of ten units, on 18 chestnut trees along a transect from a chimney emitting H 2 S to c. 200 m in the direction of the prevailing winds. A Lichen Biodiversity Index (LBI) was calculated as the sum of the frequencies of all species present within the grid. The same survey was repeated five years later. Concentration Analysis was applied to describe the data structure, and Procrustes Analysis was used to verify the congruence between the ordinations of 1992 and 1997. The statistically significant linear and non-linear regressions found between environmental variables (distance of relevés from the chimney, bark pH, lichen biomass of selected foliose and fruticose species, total sulphur content of Evernia prunastri, Hypogymnia physodes, Parmelia sulcata and Ramalina fastigiata) and the position of the relevé points on the ordination axes suggest that species distribution along the transect is related to differences in H 2 S tolerance. However, some crustose species (Lecanora cf. conizaeoides, L. saligna and Scoliciosporum umbrinum) should be probably excluded from the computation of the LBI for monitoring purposes, as their optimum is in the immediate vicinity of the H 2 S source. 1999 The British Lichen Society
The response of fragmented vegetation to human impact has been analysed in degraded and degrading... more The response of fragmented vegetation to human impact has been analysed in degraded and degrading areas in Tanzania (Lake Manyara). Phytosociology was integrated with GIS and remote sensing data as follows: (1) a land cover/land use map was obtained by analysing remote sensing data and conducting field verification; (2) phytosociological relevés were randomly sampled in woodland vegetation patches using the map; (3) the pattern of land cover/land use around the relevés was described; (4) gradients of land use intensity (human impact) were obtained based on the descriptions; (5) the response of vegetation types to impacts of gradients was calculated using fuzzy set theory.
... Stravisi b & Paola Ganis a pages 98-109. ... Aerobiologia , 14: 101107. [CrossRef] View ... more ... Stravisi b & Paola Ganis a pages 98-109. ... Aerobiologia , 14: 101107. [CrossRef] View all references; Rodríguez et al., 199846. Rodríguez, FJ, Méndez, J., Diaz, MR, Jato, V. and Iglesias, I. 1998. Pollen calendar for Vigo, North‐West Spain (1995).. Aerobiologia , 14: 269276. ...
The aerobiological behaviour of Fagaceae in Trieste and the correlations with the meteorological ... more The aerobiological behaviour of Fagaceae in Trieste and the correlations with the meteorological parameters were examined. Airborne pollen grains of Castanea, Fagus and Quercus were collected from 1990 to 2003 using a Hirst type spore trap. The main pollen season (MPS) takes place in April and May for Quercus and Fagus, in June and July for Castanea. The highest values
slo/it), Paul Tout (it/eng) design By Ideodizajn d.o.o pUBlished By Padova University Press print... more slo/it), Paul Tout (it/eng) design By Ideodizajn d.o.o pUBlished By Padova University Press printed By Present d.o.o.
A survey aimed at studying the effects of hydrogen sulphide (H 2 S) on epiphytic lichen vegetatio... more A survey aimed at studying the effects of hydrogen sulphide (H 2 S) on epiphytic lichen vegetation was carried out at Acquapassante (Mt. Amiata, Central Italy). In 1992, lichen vegetation was surveyed using a sampling grid of ten units, on 18 chestnut trees along a transect from a chimney emitting H 2 S to c. 200 m in the direction of the prevailing winds. A Lichen Biodiversity Index (LBI) was calculated as the sum of the frequencies of all species present within the grid. The same survey was repeated five years later. Concentration Analysis was applied to describe the data structure, and Procrustes Analysis was used to verify the congruence between the ordinations of 1992 and 1997. The statistically significant linear and non-linear regressions found between environmental variables (distance of relevés from the chimney, bark pH, lichen biomass of selected foliose and fruticose species, total sulphur content of Evernia prunastri, Hypogymnia physodes, Parmelia sulcata and Ramalina fastigiata) and the position of the relevé points on the ordination axes suggest that species distribution along the transect is related to differences in H 2 S tolerance. However, some crustose species (Lecanora cf. conizaeoides, L. saligna and Scoliciosporum umbrinum) should be probably excluded from the computation of the LBI for monitoring purposes, as their optimum is in the immediate vicinity of the H 2 S source. 1999 The British Lichen Society
A survey aimed at studying the effects of hydrogen sulphide (H 2 S) on epiphytic lichen vegetatio... more A survey aimed at studying the effects of hydrogen sulphide (H 2 S) on epiphytic lichen vegetation was carried out at Acquapassante (Mt. Amiata, Central Italy). In 1992, lichen vegetation was surveyed using a sampling grid of ten units, on 18 chestnut trees along a transect from a chimney emitting H 2 S to c. 200 m in the direction of the prevailing winds. A Lichen Biodiversity Index (LBI) was calculated as the sum of the frequencies of all species present within the grid. The same survey was repeated five years later. Concentration Analysis was applied to describe the data structure, and Procrustes Analysis was used to verify the congruence between the ordinations of 1992 and 1997. The statistically significant linear and non-linear regressions found between environmental variables (distance of relevés from the chimney, bark pH, lichen biomass of selected foliose and fruticose species, total sulphur content of Evernia prunastri, Hypogymnia physodes, Parmelia sulcata and Ramalina fastigiata) and the position of the relevé points on the ordination axes suggest that species distribution along the transect is related to differences in H 2 S tolerance. However, some crustose species (Lecanora cf. conizaeoides, L. saligna and Scoliciosporum umbrinum) should be probably excluded from the computation of the LBI for monitoring purposes, as their optimum is in the immediate vicinity of the H 2 S source. 1999 The British Lichen Society
The response of fragmented vegetation to human impact has been analysed in degraded and degrading... more The response of fragmented vegetation to human impact has been analysed in degraded and degrading areas in Tanzania (Lake Manyara). Phytosociology was integrated with GIS and remote sensing data as follows: (1) a land cover/land use map was obtained by analysing remote sensing data and conducting field verification; (2) phytosociological relevés were randomly sampled in woodland vegetation patches using the map; (3) the pattern of land cover/land use around the relevés was described; (4) gradients of land use intensity (human impact) were obtained based on the descriptions; (5) the response of vegetation types to impacts of gradients was calculated using fuzzy set theory.
... Stravisi b & Paola Ganis a pages 98-109. ... Aerobiologia , 14: 101107. [CrossRef] View ... more ... Stravisi b & Paola Ganis a pages 98-109. ... Aerobiologia , 14: 101107. [CrossRef] View all references; Rodríguez et al., 199846. Rodríguez, FJ, Méndez, J., Diaz, MR, Jato, V. and Iglesias, I. 1998. Pollen calendar for Vigo, North‐West Spain (1995).. Aerobiologia , 14: 269276. ...
The aerobiological behaviour of Fagaceae in Trieste and the correlations with the meteorological ... more The aerobiological behaviour of Fagaceae in Trieste and the correlations with the meteorological parameters were examined. Airborne pollen grains of Castanea, Fagus and Quercus were collected from 1990 to 2003 using a Hirst type spore trap. The main pollen season (MPS) takes place in April and May for Quercus and Fagus, in June and July for Castanea. The highest values
slo/it), Paul Tout (it/eng) design By Ideodizajn d.o.o pUBlished By Padova University Press print... more slo/it), Paul Tout (it/eng) design By Ideodizajn d.o.o pUBlished By Padova University Press printed By Present d.o.o.
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