Ethiopian moist evergreen Afromontane forests are vital for the conservation of plant diversity,including genetic pools of Coffea arabica L.However,these forests are continuously shrinking and need empirical scientifi...Ethiopian moist evergreen Afromontane forests are vital for the conservation of plant diversity,including genetic pools of Coffea arabica L.However,these forests are continuously shrinking and need empirical scientific studies for their effective conservation and sustainable management.This study was,therefore,conducted to assess woody species composition,diversity,endemicity,structure,plant communities,and environmental determinants in Sirso moist evergreen Afromontane forest of southern Ethiopia.Environmental variables such as altitude,slope,aspect,disturbance levels,and geographical location were recorded for each main plots.Vegetation structure and importance value index(IVI),diversity,vegetation classification,and correlation with environmental factors were analyzed.A total of 74 woody species representing 70 genera and 34 families were identified.Seven species were endemic.Rhus glutinosa A.Rich subsp.glutinosa and Prunus africana(Hook.f.)Kalkm.were species categorized as vulnerable according to the IUCN red list category.The highest number of species was recorded for the Rubiaceae family(8),followed by Euphorbiaceae(6),and Asteraceae(6).Five plant communities were identified:Maesa lanceolata-Dombeya torrida,Galiniera saxifraga-Cyathea manniana,Vepris dainellii-Triumfetta tomentosa,Dracaena fragrans-Rytigynia neglecta,and Arundinaria alpina.The distribution of these communities depends on altitude,slope,and disturbance factors.Syzygium guineense(Wild.)DC.,Schefflera abyssinica(Hochst.ex A.Rich.)Harms,and Galiniera saxifraga(Hochst.)Bridson were species with the highest IVI,while P.africana,Cordia africana Lam.,Hagenia abyssinica(Bruce)J.F.Gmelin,Bridelia micrantha(Hochst.)Baill.,and C.arabica had the lowest.Population structure of woody species showed an inverted J-shape,a J-shape,a bell-shape,and an irregular shaped pattern.These latter three population structure revealed signs of disturbances,and were negatively correlated with altitude and slope.The study showed that the Sirso moist evergreen Afromontane forest is species rich and should be given conservation priority to maintain endemic and native species.展开更多
In recent decades,environmental changes in the Arctic have aroused widespread concern around the world.To better understand ecology issues such as ecosystem dynamics,the Arctic and the subarctic regions were integrate...In recent decades,environmental changes in the Arctic have aroused widespread concern around the world.To better understand ecology issues such as ecosystem dynamics,the Arctic and the subarctic regions were integrated as the“pan-Arctic”region.In this study,mesozooplankton were sampled from the Bering Sea shelf to the northern Chukchi Sea during the 10th Chinese National Arctic Research Expedition in 2019.Based on the species composition and abundance,three geographical communities were identified:the Bering Sea shelf community(BSS),the Bering Strait transitional community(BST),and the Chukchi Sea shelf community(CSS).The BSS was characterized by Bering Sea oceanic species such as Eucalanus bungii;the BST was mainly composed of the pan-Arctic distributed Calanus glacialis,meroplankton of benthos,and neritic species such as Centropages abdominalis;copepods,especially the copepodite of C.glacialis,were predominant in the CSS community.The BSS community structure was strongly affected by the inflow of Bering Shelf Water,while those of BST and CSS were determined by the recruitment of local species.The zooplankton community structure is influenced by both advection and environmental changes such as warming and a prolonged productivity period.Here,it was difficult to distinguish the changes induced by climate change from the effects of the Bering Sea Water.The key to solving this problem is the accumulation of comparable data,which requires continuous monitoring of key species such as C.glacialis and Calanus hyperboreus.展开更多
基金The project was fully funded by the Ethiopian Biodiversity Institute and NORAD project,Hawassa University.
文摘Ethiopian moist evergreen Afromontane forests are vital for the conservation of plant diversity,including genetic pools of Coffea arabica L.However,these forests are continuously shrinking and need empirical scientific studies for their effective conservation and sustainable management.This study was,therefore,conducted to assess woody species composition,diversity,endemicity,structure,plant communities,and environmental determinants in Sirso moist evergreen Afromontane forest of southern Ethiopia.Environmental variables such as altitude,slope,aspect,disturbance levels,and geographical location were recorded for each main plots.Vegetation structure and importance value index(IVI),diversity,vegetation classification,and correlation with environmental factors were analyzed.A total of 74 woody species representing 70 genera and 34 families were identified.Seven species were endemic.Rhus glutinosa A.Rich subsp.glutinosa and Prunus africana(Hook.f.)Kalkm.were species categorized as vulnerable according to the IUCN red list category.The highest number of species was recorded for the Rubiaceae family(8),followed by Euphorbiaceae(6),and Asteraceae(6).Five plant communities were identified:Maesa lanceolata-Dombeya torrida,Galiniera saxifraga-Cyathea manniana,Vepris dainellii-Triumfetta tomentosa,Dracaena fragrans-Rytigynia neglecta,and Arundinaria alpina.The distribution of these communities depends on altitude,slope,and disturbance factors.Syzygium guineense(Wild.)DC.,Schefflera abyssinica(Hochst.ex A.Rich.)Harms,and Galiniera saxifraga(Hochst.)Bridson were species with the highest IVI,while P.africana,Cordia africana Lam.,Hagenia abyssinica(Bruce)J.F.Gmelin,Bridelia micrantha(Hochst.)Baill.,and C.arabica had the lowest.Population structure of woody species showed an inverted J-shape,a J-shape,a bell-shape,and an irregular shaped pattern.These latter three population structure revealed signs of disturbances,and were negatively correlated with altitude and slope.The study showed that the Sirso moist evergreen Afromontane forest is species rich and should be given conservation priority to maintain endemic and native species.
基金This study was financially supported by the National Natural Science Foundation of China(Grant nos.41706217,42166228).
文摘In recent decades,environmental changes in the Arctic have aroused widespread concern around the world.To better understand ecology issues such as ecosystem dynamics,the Arctic and the subarctic regions were integrated as the“pan-Arctic”region.In this study,mesozooplankton were sampled from the Bering Sea shelf to the northern Chukchi Sea during the 10th Chinese National Arctic Research Expedition in 2019.Based on the species composition and abundance,three geographical communities were identified:the Bering Sea shelf community(BSS),the Bering Strait transitional community(BST),and the Chukchi Sea shelf community(CSS).The BSS was characterized by Bering Sea oceanic species such as Eucalanus bungii;the BST was mainly composed of the pan-Arctic distributed Calanus glacialis,meroplankton of benthos,and neritic species such as Centropages abdominalis;copepods,especially the copepodite of C.glacialis,were predominant in the CSS community.The BSS community structure was strongly affected by the inflow of Bering Shelf Water,while those of BST and CSS were determined by the recruitment of local species.The zooplankton community structure is influenced by both advection and environmental changes such as warming and a prolonged productivity period.Here,it was difficult to distinguish the changes induced by climate change from the effects of the Bering Sea Water.The key to solving this problem is the accumulation of comparable data,which requires continuous monitoring of key species such as C.glacialis and Calanus hyperboreus.
