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Volume 47 (2020): Edition 2 (November 2020)
Special Edition: Invasive species in forest, agricultural and urban ecosystems

Volume 47 (2020): Edition 1 (May 2020)

Volume 46 (2019): Edition 2 (December 2019)

Volume 46 (2019): Edition 1 (May 2019)

Volume 45 (2018): Edition 2 (December 2018)

Volume 45 (2018): Edition 1 (May 2018)

Volume 44 (2017): Edition 2 (December 2017)

Volume 44 (2017): Edition 1 (June 2017)

Détails du magazine
Format
Magazine
eISSN
1338-7014
Première publication
16 Apr 2017
Période de publication
2 fois par an
Langues
Anglais

Chercher

Volume 46 (2019): Edition 1 (May 2019)

Détails du magazine
Format
Magazine
eISSN
1338-7014
Première publication
16 Apr 2017
Période de publication
2 fois par an
Langues
Anglais

Chercher

9 Articles
Accès libre

Demographic response of the Gambian Gerbil to seasonal changes in Savannah fallow fields

Publié en ligne: 27 May 2019
Pages: 1 - 9

Résumé

Abstract

The Savannah gerbil, Gerbilliscus gambianus (Muridae: Gerbillinae) is important to the ecological relations of the dry grassland ecosystem of West Africa, as well as, being a zoonotic agent of human diseases and potential crop pest. We examined the impact of seasonal changes on the population dynamics of G. gambianus in northern Nigeria, by completing population estimates using capture–mark–recapture (CMR) and indirect population density indices (PDI) methods. The latter included fecal pellet counts and limited spotlightening. During 1990–1992 we collected both CMR and PDI data, and established their relationship by regression, thus calibrating the PDI values to CMR estimator. We also completed a separate, PDI only, study during 2015–2017, and estimated monthly densities indirectly by toning the PDI values to population sizes in the CMR estimator. The lowest declines (<20 gerbils ha−1) were in mid rains (July–August), and highest increases (>90 gerbils ha−1) were after the rains (October–January). Seasonal effects on densities were significant during 1990–1992 but not during 2015–2017. There were improved survival rates for both adults (0.95) and young (0.83), adult capture probability (0.56), and mean monthly recruitment of young (23) after the rains. There was no significant change in the overall population dynamic pattern of G. gambianus over a 25-year period. Because G. gambianus did not maintain colonies inside farmlands cultivated by rain or irrigation, and its tendency for large population drops in mid-rains, we are in doubt of its potential as crop pest in northern Nigeria.

Mots clés

  • Gerbil
  • grassland
  • population
  • rodents
  • tropical
  • West Africa
Accès libre

The influence of stand density on the structure of harvestmen communities (Opiliones) in a submountain beech forest

Publié en ligne: 27 May 2019
Pages: 10 - 15

Résumé

Abstract

Modification of forest stand density by thinning is a common silvicultural practice implemented in management of production forests. However, changes in the stand density can entail considerable changes to the present forest environment and communities. The current knowledge about the effect of stand density modification on the local animal communities is based mainly on the flagship groups such as carabid beetles or birds. We focused our study on harvestmen. We explored how the stand density influences species composition of this species communities in submountain beech forests. The study was conducted in the Kováčovská dolina valley (Kremnické vrchy Mts, Central Slovakia) in 1997 and 1998, the method used was pitfall trapping. In total, 9 harvestmen species from 5 families were recorded. Prior to our research, the forest stands at the study locality were subject to thinning interventions the intensity of which influenced the structure of the local harvestmen communities. The most pronounced was the effect of very intensive thinning with stand density reduced below 0.5. From the recorded species, four preferred forest stands with lower stand density (Lophopilio palpinalis, Oligolophus tridens, Nemastoma lugubre, Trogulus nepaeformis), two species (Platybunus bucephalus, Dicranolasma scabrum) preferred forest stands with higher stand density. Generalization of the observed pattern requires to explore a wider spectrum of beech forests.

Mots clés

  • canopy cover
  • community density
  • cutting
  • openness
  • silvicultural practice
Accès libre

Svalbard reindeer (Rangifer tarandus platyrhynchus) antler characteristics reflecting the local environmental conditions

Publié en ligne: 27 May 2019
Pages: 16 - 23

Résumé

Abstract

A new non-invasive method based on picture analysis was used to estimate the conditions in Svalbard reindeer populations. The well-being of an individual subject is often expressed through visual indices. Two distinct reindeer populations were compared based on their antler parameters. Relative antler size and number of tines are variables supposed to reflect correspondingly the environmental conditions of sedentary populations within the growing season. The occurrence areas of two studied populations are distinctly isolated – separated with high mountain ridges, glaciers and fjords. The population in Petuniabukta occupies a sparsely vegetated region with harsh climatic conditions, whereas Skansbukta represents an area with continuous tundra vegetation cover, milder climatic conditions and, consequently, also a longer vegetation season. These environmental factors probably caused significant differences in the relative antler size and number of tines in the studied species. The Skansbukta population exhibited a larger relative antler size and higher number of tines than the population in Petuniabukta (both parameters differed significantly, p < 0.01). This difference reflects concisely the different environmental conditions of both locations. A comparison of Skansbukta population antler characteristics between years 2017 and 2018 did not reveal significant changes, most probably due to very similar atmospheric conditions in these two years (in terms of air temperature).

Mots clés

  • antlers
  • environmental conditions
  • population characteristics
  • Svalbard reindeer
Accès libre

Effects of inventory grids on estimation of tree species diversity in semi-arid forests of Iran

Publié en ligne: 27 May 2019
Pages: 24 - 29

Résumé

Abstract

Species diversity is one of the most important indices used to evaluate the sustainability of forest communities. The sampling method and the number of plots are factors affecting the estimation of plant biodiversity. In the present study, effects of different inventory grids on estimation of tree species diversity were compared in semi-arid forests of Iran. There were selected 50 hectares of these forests representing the regional forests. Sampling procedures were carried out on circular plots (1,000m2) within inventory grids, with dimensions of 50 × 50 m (200 plots), 100 × 50 m (100 plots), 100 × 100 m (50 plots), 200 × 50 m (50 plots), 200 × 100 m (25 plots), and 250 × 200 m (10 plots). For each plot, the type of the species and the number of trees were recorded. Simpson (1-D), Hill (N2), Shannon-Wiener (H), Mc Arthur (N1), Smith-Wilson (Evar) and Margalef (R1) indices were used to estimate the tree species diversity. The inventory grid was evaluated based on the precision and cost criteria (E%2 × T). The obtained sampling error values showed that the inventory grid consisting of 200 plots exhibited more accuracy for estimating the biodiversity indices. But based on the results of E%2 × T, the inventory grid with 25 plots was selected as the most appropriate one for estimating the tree species diversity in semi-arid forests. The results of this study can also serve to estimate the tree species diversity in other semi-arid forests of Iran.

Mots clés

  • biodiversity indices
  • precision and cost
  • sampling method
  • Zagros forests
Accès libre

Habitat-related specifity of iPBS fingerprint in European populations of Hedera helix L.

Publié en ligne: 27 May 2019
Pages: 30 - 36

Résumé

Abstract

Inter primer binding site (iPBS) polymorphism was investigated for common ivy (Hedera helix, L.) to obtain the knowledge on genetic diversity in this species. Actually, a very limited information exists about application of DNA markers in Hedera helix. Natural and planted European populations of ivy were analysed using an iPBS marker 5′ACCTGGCGTGCCA3′ with a total number of 238 fragments generated. Of these, 86% were polymorphic. There were determined certain attributes of this marker such as the diversity index (DI) and polymorphism information content (PIC). The value of the diversity index was 0.79 and the polymorphic information index was 0.78. The proportion of polymorphisms of the individual amplified loci ranged from 0.32% to 6.98%. Cluster analysis was performed to determine the relationships among the European ivy populations where the distribution in the dendrogram under the habitat specifity was found for the used iPBS marker. We concluded that iPBS was very efficient in analysing the genetic diversity in Hedera helix, L. and that this marker can serve as a suitable tool to find genomically specific fingerprints relevant to the factors influencing the distribution of genetic variation.

Mots clés

  • genetic diversity
  • L.
  • iPBS
  • population
Accès libre

Ground beetles (Coleoptera: Carabidae) as predators of conifer seeds

Publié en ligne: 27 May 2019
Pages: 37 - 44

Résumé

Abstract

Many species of ground beetles (Coleoptera: Carabidae) are important predators of seeds. While the consumption of herb seeds has been intensively studied, little attention has been paid to the consumption of seeds of gymnosperm plants. Here, we determined the consumption of seeds of six coniferous species by four common carabid species and compared carabid preference for conifer and selected common angiosperm weed seed species. In no-choice experiments, the large carabid species Pseudoophonus rufipes preferentially consumed the seeds of Picea abies, Larix decidua and Pinus sylvestris. Pinus sylvestris was also preferred by another large carabid, Pterostichus melanarius. The smaller carabids Harpalus affinis and H. rubripes consumed conifer seeds reluctantly. The intensity of seed consumption by carabids decreased with increasing seed size. In choice experiments, both of the large carabid species preferred the small conifer seeds of P. sylvestris and L. decidua over herb seeds of similar size (Dipsacus fullonum, Galeopsis speciosa, Polygonum lapathifolium). Carabids may prefer conifer seeds because of their soft seed coats, regardless of their chemical protections. Postdispersal predation of seeds by carabids may be an important mortality factor in some conifer species.

Mots clés

  • angiosperms
  • gymnosperms
  • seed consumption
  • seed size
Accès libre

Genetic variability and heritability of some morphological and physiological traits in Fagus orientalis Lipsky along an elevation gradient in Hyrcanian forests

Publié en ligne: 27 May 2019
Pages: 45 - 53

Résumé

Abstract

The purpose of the present study was to evaluate the genetic variability and heritability of some morphological and physiological traits in Fagus orientalis Lipsky along an elevation gradient in northern forests of Iran. Beech leaves were sampled from southern and northern crown parts of healthy mature trees along an elevation gradient comprising sites situated at 700 m, 1,200 m and 1,700 m above the sea level. Our statistical analysis showed that the investigated traits differed significantly between the populations. The results indicated the lowest and the highest coefficients of variation for the high (1,700 m) and middle elevation populations (1,200 m) for leaf length, petiole length, leaf area, specific leaf area, dry weight, specific dry weight, leaf index and petiole index traits. With increasing elevation, mean leaf width, distance from leaf base to the leaf maximum width, dry weight and petiole index increased. The plasticity of leaf length, specific leaf area, specific dry weight, petiole index and petiole length peaked at middle elevation, and with increasing elevation, the plasticity of these traits declined. The distance from leaf base to the leaf maximum width had the highest coefficient of genetic (75.5%) and phenotypic (75.5%) variation. The heritability results showed that there were differences in all traits, and that the highest heritability was recorded for the distance from the leaf base to the leaf maximum width (99.95 %). The results suggest that the studied beech populations responded to the environmental changes by changing their leaf traits in different ways at different altitudes.

Mots clés

  • correlation
  • elevation change
  • heritability
  • leaf trait
  • plasticity
Accès libre

Ecologically conditioned imprinting of miRNA-based profiles of Ginkgo biloba L. growing in Slovakia

Publié en ligne: 27 May 2019
Pages: 54 - 62

Résumé

Abstract

Ginkgo biloba L. is characterized by its high level of resistance to climatic conditions, diseases, and pests. In Slovakia, there is a rich collection of genetic resources of ginkgo consisting of 288 trees growing in 103 locations and providing valuable biological material for scientific research. There have been documented 45 trees of ginkgo older than 100 years (ranging from 112 to 242 years of age). Their dendrometrical parameters were recorded. For genomic imprinting, three types of microRNA-based markers were selected; highly conserved gb-miR160, moderately conserved gb-miR482 and the species-specific gb-miR75. The most efficient one can be considered the marker gb-miR482 with its genotype-unique miRNA profiles probably related to this marker functioning in the defence mechanisms of the ginkgo species. Unique miRNA loci were recorded in genomes of young ginkgo trees. We found that, by selecting the appropriate microRNA-based markers, it is possible to characterize the ginkgo genome in the context of microclimatic conditions.

Mots clés

  • locality
  • molecular markers
  • Slovakia
Accès libre

Patch metrics of roosting site selection by Lyle’s flying fox (Pteropus lylei Andersen, 1908) in a human-dominated landscape in Thailand

Publié en ligne: 27 May 2019
Pages: 63 - 72

Résumé

Abstract

The association between patch metrics and roosting site (n = 31) suitability of Lyle’s flying fox (Pteropus lylei) in 26 Central Eastern and Western provinces of Thailand was quantified. Land use classes with 90-m resolution were identified based on various vegetation and land cover types to calculate patch metrics using FRAGSTATS. Then, Maximum Entropy Modeling (MaxEnt) was performed using patch metrics covariates to produce a predictive potential distribution map. The results indicated that patch contiguity (contiguity index, 63.7%), patch area (29.3%), and patch shape complexity (shape index, 5.7%) are the most influential patch metrics, all of which have negative effects on roosting site suitability. In total, 13,222 small patches were considered highly suitable patches, with a mean area of 0.921 ± 0.698 (SD) ha, which accounted for 122,090 ha (2.04%) of the study area. Roosting sites predicted from the model were consistently associated with occurrences of roosting sites observed in temples; such habitats likely provide shelter from external threats for colonies roosting in a human-dominated landscape.

Mots clés

  • Lyle’s flying fox
  • MaxEnt
  • patch metrics
  • roosting site selection
  • species distribution modeling
9 Articles
Accès libre

Demographic response of the Gambian Gerbil to seasonal changes in Savannah fallow fields

Publié en ligne: 27 May 2019
Pages: 1 - 9

Résumé

Abstract

The Savannah gerbil, Gerbilliscus gambianus (Muridae: Gerbillinae) is important to the ecological relations of the dry grassland ecosystem of West Africa, as well as, being a zoonotic agent of human diseases and potential crop pest. We examined the impact of seasonal changes on the population dynamics of G. gambianus in northern Nigeria, by completing population estimates using capture–mark–recapture (CMR) and indirect population density indices (PDI) methods. The latter included fecal pellet counts and limited spotlightening. During 1990–1992 we collected both CMR and PDI data, and established their relationship by regression, thus calibrating the PDI values to CMR estimator. We also completed a separate, PDI only, study during 2015–2017, and estimated monthly densities indirectly by toning the PDI values to population sizes in the CMR estimator. The lowest declines (<20 gerbils ha−1) were in mid rains (July–August), and highest increases (>90 gerbils ha−1) were after the rains (October–January). Seasonal effects on densities were significant during 1990–1992 but not during 2015–2017. There were improved survival rates for both adults (0.95) and young (0.83), adult capture probability (0.56), and mean monthly recruitment of young (23) after the rains. There was no significant change in the overall population dynamic pattern of G. gambianus over a 25-year period. Because G. gambianus did not maintain colonies inside farmlands cultivated by rain or irrigation, and its tendency for large population drops in mid-rains, we are in doubt of its potential as crop pest in northern Nigeria.

Mots clés

  • Gerbil
  • grassland
  • population
  • rodents
  • tropical
  • West Africa
Accès libre

The influence of stand density on the structure of harvestmen communities (Opiliones) in a submountain beech forest

Publié en ligne: 27 May 2019
Pages: 10 - 15

Résumé

Abstract

Modification of forest stand density by thinning is a common silvicultural practice implemented in management of production forests. However, changes in the stand density can entail considerable changes to the present forest environment and communities. The current knowledge about the effect of stand density modification on the local animal communities is based mainly on the flagship groups such as carabid beetles or birds. We focused our study on harvestmen. We explored how the stand density influences species composition of this species communities in submountain beech forests. The study was conducted in the Kováčovská dolina valley (Kremnické vrchy Mts, Central Slovakia) in 1997 and 1998, the method used was pitfall trapping. In total, 9 harvestmen species from 5 families were recorded. Prior to our research, the forest stands at the study locality were subject to thinning interventions the intensity of which influenced the structure of the local harvestmen communities. The most pronounced was the effect of very intensive thinning with stand density reduced below 0.5. From the recorded species, four preferred forest stands with lower stand density (Lophopilio palpinalis, Oligolophus tridens, Nemastoma lugubre, Trogulus nepaeformis), two species (Platybunus bucephalus, Dicranolasma scabrum) preferred forest stands with higher stand density. Generalization of the observed pattern requires to explore a wider spectrum of beech forests.

Mots clés

  • canopy cover
  • community density
  • cutting
  • openness
  • silvicultural practice
Accès libre

Svalbard reindeer (Rangifer tarandus platyrhynchus) antler characteristics reflecting the local environmental conditions

Publié en ligne: 27 May 2019
Pages: 16 - 23

Résumé

Abstract

A new non-invasive method based on picture analysis was used to estimate the conditions in Svalbard reindeer populations. The well-being of an individual subject is often expressed through visual indices. Two distinct reindeer populations were compared based on their antler parameters. Relative antler size and number of tines are variables supposed to reflect correspondingly the environmental conditions of sedentary populations within the growing season. The occurrence areas of two studied populations are distinctly isolated – separated with high mountain ridges, glaciers and fjords. The population in Petuniabukta occupies a sparsely vegetated region with harsh climatic conditions, whereas Skansbukta represents an area with continuous tundra vegetation cover, milder climatic conditions and, consequently, also a longer vegetation season. These environmental factors probably caused significant differences in the relative antler size and number of tines in the studied species. The Skansbukta population exhibited a larger relative antler size and higher number of tines than the population in Petuniabukta (both parameters differed significantly, p < 0.01). This difference reflects concisely the different environmental conditions of both locations. A comparison of Skansbukta population antler characteristics between years 2017 and 2018 did not reveal significant changes, most probably due to very similar atmospheric conditions in these two years (in terms of air temperature).

Mots clés

  • antlers
  • environmental conditions
  • population characteristics
  • Svalbard reindeer
Accès libre

Effects of inventory grids on estimation of tree species diversity in semi-arid forests of Iran

Publié en ligne: 27 May 2019
Pages: 24 - 29

Résumé

Abstract

Species diversity is one of the most important indices used to evaluate the sustainability of forest communities. The sampling method and the number of plots are factors affecting the estimation of plant biodiversity. In the present study, effects of different inventory grids on estimation of tree species diversity were compared in semi-arid forests of Iran. There were selected 50 hectares of these forests representing the regional forests. Sampling procedures were carried out on circular plots (1,000m2) within inventory grids, with dimensions of 50 × 50 m (200 plots), 100 × 50 m (100 plots), 100 × 100 m (50 plots), 200 × 50 m (50 plots), 200 × 100 m (25 plots), and 250 × 200 m (10 plots). For each plot, the type of the species and the number of trees were recorded. Simpson (1-D), Hill (N2), Shannon-Wiener (H), Mc Arthur (N1), Smith-Wilson (Evar) and Margalef (R1) indices were used to estimate the tree species diversity. The inventory grid was evaluated based on the precision and cost criteria (E%2 × T). The obtained sampling error values showed that the inventory grid consisting of 200 plots exhibited more accuracy for estimating the biodiversity indices. But based on the results of E%2 × T, the inventory grid with 25 plots was selected as the most appropriate one for estimating the tree species diversity in semi-arid forests. The results of this study can also serve to estimate the tree species diversity in other semi-arid forests of Iran.

Mots clés

  • biodiversity indices
  • precision and cost
  • sampling method
  • Zagros forests
Accès libre

Habitat-related specifity of iPBS fingerprint in European populations of Hedera helix L.

Publié en ligne: 27 May 2019
Pages: 30 - 36

Résumé

Abstract

Inter primer binding site (iPBS) polymorphism was investigated for common ivy (Hedera helix, L.) to obtain the knowledge on genetic diversity in this species. Actually, a very limited information exists about application of DNA markers in Hedera helix. Natural and planted European populations of ivy were analysed using an iPBS marker 5′ACCTGGCGTGCCA3′ with a total number of 238 fragments generated. Of these, 86% were polymorphic. There were determined certain attributes of this marker such as the diversity index (DI) and polymorphism information content (PIC). The value of the diversity index was 0.79 and the polymorphic information index was 0.78. The proportion of polymorphisms of the individual amplified loci ranged from 0.32% to 6.98%. Cluster analysis was performed to determine the relationships among the European ivy populations where the distribution in the dendrogram under the habitat specifity was found for the used iPBS marker. We concluded that iPBS was very efficient in analysing the genetic diversity in Hedera helix, L. and that this marker can serve as a suitable tool to find genomically specific fingerprints relevant to the factors influencing the distribution of genetic variation.

Mots clés

  • genetic diversity
  • L.
  • iPBS
  • population
Accès libre

Ground beetles (Coleoptera: Carabidae) as predators of conifer seeds

Publié en ligne: 27 May 2019
Pages: 37 - 44

Résumé

Abstract

Many species of ground beetles (Coleoptera: Carabidae) are important predators of seeds. While the consumption of herb seeds has been intensively studied, little attention has been paid to the consumption of seeds of gymnosperm plants. Here, we determined the consumption of seeds of six coniferous species by four common carabid species and compared carabid preference for conifer and selected common angiosperm weed seed species. In no-choice experiments, the large carabid species Pseudoophonus rufipes preferentially consumed the seeds of Picea abies, Larix decidua and Pinus sylvestris. Pinus sylvestris was also preferred by another large carabid, Pterostichus melanarius. The smaller carabids Harpalus affinis and H. rubripes consumed conifer seeds reluctantly. The intensity of seed consumption by carabids decreased with increasing seed size. In choice experiments, both of the large carabid species preferred the small conifer seeds of P. sylvestris and L. decidua over herb seeds of similar size (Dipsacus fullonum, Galeopsis speciosa, Polygonum lapathifolium). Carabids may prefer conifer seeds because of their soft seed coats, regardless of their chemical protections. Postdispersal predation of seeds by carabids may be an important mortality factor in some conifer species.

Mots clés

  • angiosperms
  • gymnosperms
  • seed consumption
  • seed size
Accès libre

Genetic variability and heritability of some morphological and physiological traits in Fagus orientalis Lipsky along an elevation gradient in Hyrcanian forests

Publié en ligne: 27 May 2019
Pages: 45 - 53

Résumé

Abstract

The purpose of the present study was to evaluate the genetic variability and heritability of some morphological and physiological traits in Fagus orientalis Lipsky along an elevation gradient in northern forests of Iran. Beech leaves were sampled from southern and northern crown parts of healthy mature trees along an elevation gradient comprising sites situated at 700 m, 1,200 m and 1,700 m above the sea level. Our statistical analysis showed that the investigated traits differed significantly between the populations. The results indicated the lowest and the highest coefficients of variation for the high (1,700 m) and middle elevation populations (1,200 m) for leaf length, petiole length, leaf area, specific leaf area, dry weight, specific dry weight, leaf index and petiole index traits. With increasing elevation, mean leaf width, distance from leaf base to the leaf maximum width, dry weight and petiole index increased. The plasticity of leaf length, specific leaf area, specific dry weight, petiole index and petiole length peaked at middle elevation, and with increasing elevation, the plasticity of these traits declined. The distance from leaf base to the leaf maximum width had the highest coefficient of genetic (75.5%) and phenotypic (75.5%) variation. The heritability results showed that there were differences in all traits, and that the highest heritability was recorded for the distance from the leaf base to the leaf maximum width (99.95 %). The results suggest that the studied beech populations responded to the environmental changes by changing their leaf traits in different ways at different altitudes.

Mots clés

  • correlation
  • elevation change
  • heritability
  • leaf trait
  • plasticity
Accès libre

Ecologically conditioned imprinting of miRNA-based profiles of Ginkgo biloba L. growing in Slovakia

Publié en ligne: 27 May 2019
Pages: 54 - 62

Résumé

Abstract

Ginkgo biloba L. is characterized by its high level of resistance to climatic conditions, diseases, and pests. In Slovakia, there is a rich collection of genetic resources of ginkgo consisting of 288 trees growing in 103 locations and providing valuable biological material for scientific research. There have been documented 45 trees of ginkgo older than 100 years (ranging from 112 to 242 years of age). Their dendrometrical parameters were recorded. For genomic imprinting, three types of microRNA-based markers were selected; highly conserved gb-miR160, moderately conserved gb-miR482 and the species-specific gb-miR75. The most efficient one can be considered the marker gb-miR482 with its genotype-unique miRNA profiles probably related to this marker functioning in the defence mechanisms of the ginkgo species. Unique miRNA loci were recorded in genomes of young ginkgo trees. We found that, by selecting the appropriate microRNA-based markers, it is possible to characterize the ginkgo genome in the context of microclimatic conditions.

Mots clés

  • locality
  • molecular markers
  • Slovakia
Accès libre

Patch metrics of roosting site selection by Lyle’s flying fox (Pteropus lylei Andersen, 1908) in a human-dominated landscape in Thailand

Publié en ligne: 27 May 2019
Pages: 63 - 72

Résumé

Abstract

The association between patch metrics and roosting site (n = 31) suitability of Lyle’s flying fox (Pteropus lylei) in 26 Central Eastern and Western provinces of Thailand was quantified. Land use classes with 90-m resolution were identified based on various vegetation and land cover types to calculate patch metrics using FRAGSTATS. Then, Maximum Entropy Modeling (MaxEnt) was performed using patch metrics covariates to produce a predictive potential distribution map. The results indicated that patch contiguity (contiguity index, 63.7%), patch area (29.3%), and patch shape complexity (shape index, 5.7%) are the most influential patch metrics, all of which have negative effects on roosting site suitability. In total, 13,222 small patches were considered highly suitable patches, with a mean area of 0.921 ± 0.698 (SD) ha, which accounted for 122,090 ha (2.04%) of the study area. Roosting sites predicted from the model were consistently associated with occurrences of roosting sites observed in temples; such habitats likely provide shelter from external threats for colonies roosting in a human-dominated landscape.

Mots clés

  • Lyle’s flying fox
  • MaxEnt
  • patch metrics
  • roosting site selection
  • species distribution modeling

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