Sample plots were established in the principal forest types in the the Nevado de Toluca National Park, Mexico including those domi- nated by Pinus hartwegii, Abies religiosa, Quercus laurina and Alnus jorullensis. The...Sample plots were established in the principal forest types in the the Nevado de Toluca National Park, Mexico including those domi- nated by Pinus hartwegii, Abies religiosa, Quercus laurina and Alnus jorullensis. The vertical structure was defined by three strata in the coniferous forests and two strata in the broadleaved forests. Timber harvesting in Abies religiosa and Quercus laurina forests and fires generated by humans in Pinus hartwegii forests impeded the recruitment of saplings. Mature trees were also heavily impacted by logging in Pinus hartwegii forests. On the contrary, Alnusjorullensis forests were increas- ing due to the disturbance of Pinus and Quercus forests, as well aban- doned crop lands within the park. A combination of logging, uncon- trolled fire, and grazing appears to be compromising the recruitment of important tree species in this national park. These factors, together with human settlements, have also increased the proportion of early succes- sional species. Changes in forest structure from human disturbance indicate a need to control these activities if conservation goals are not to be compromised.展开更多
Small mammals have been proposed playing an important role in the energy flow and regeneration of forest ecosystems. We compared species richness, diversity (H’) of small mammal communities and abundance of six domin...Small mammals have been proposed playing an important role in the energy flow and regeneration of forest ecosystems. We compared species richness, diversity (H’) of small mammal communities and abundance of six dominant species of small mammals in disturbed and protected forests (four age classes: 6 - 10, 11 - 15, 16 - 20 and 31 - 40 years old) in China. We also investigated the structural variables (such as species richness, cover rate and abundance of shrubs and grasses) in the bottom layer, which considered to be important for small mammals and might be altered by human disturbance. The relationships between small mammals and these structural variables were examined to determine the potential effects of human disturbance on the small mammals in the restored forests. Our results indicated that the structure and composition of the vegetation in the bottom layer were simplified by human disturbance, while the abundance and cover rate of grasses were significantly increased. Although no significant differences were observed in species richness of small mammals between the protected and disturbed forests at the same age, the diversity index of small mammals in the protected forests was always significantly higher than in the disturbed forests. Regression showed that the species richness and diversity of small mammals increased with the species richness of shrubs, and was negatively correlated to the cover rate of grasses in the bottom layer. Human disturbance increased the total abundance of small mammals, and the increased cover rate of grasses in the bottom layer was beneficial to the abundance of small mammals. Obvious succession of small mammal communities occurred as the protected forest aged. In the protected forests, small ground-dwelling mammals (A. chevrieri, E. miletus and M. pahari) were the dominant species in the younger forests. Other mammals (T. belangeri, D. pernyi and C. erythraeus) gradually became the dominant species as the protected forests aged. However, in the disturbed forests, the smaller ground-dwelling mammals (T. belangeri, D. pernyi and C. erythraeus) were always the dominant species at all ages of the disturbed forests. Regression indicated that the cover rate of grasses in the bottom layer was beneficial to the three smaller body size and ground-dwelling small mammal species, while the shrubs were beneficial to the three bigger body size mammal species.展开更多
Plant species diversity is an important index reflecting the functional complexity and stability of ecosystems.Human activity can completely alter plant species diversity and cause serious degradation of ecosystems bu...Plant species diversity is an important index reflecting the functional complexity and stability of ecosystems.Human activity can completely alter plant species diversity and cause serious degradation of ecosystems but its impact on bamboo forest still lacks of systematic evaluation.In this study,we performed a field investigation to reveal the influences of human disturbances on the plant diversity and stability of Moso bamboo forests at Southern China.The selected bamboo fields contained different intensities of human activities that could be classified as slight,moderate and severe disturbance level.Species richness index S,Shannon-Wienner index H,Simpson index D,Pielou index Jsw,community similarity index IS and community stability index were employed to quantitatively evaluate the plant species diversity and stability.The survey revealed that there were 203 species belonging to 83 families and 108 genera in Moso bamboo forests.The number of plant species in the Moso bamboo forests decreased with the increasing of disturbance intensity.The species diversity indexes generally followed the order of slight>moderate>severe disturbance,as well as the richness index S,Shannon-Wienner index H and Pielou index Jsw.The similarity and species stability of the bamboo forest communities also decreased with the increase of the disturbance intensity.Under the severe disturbance,plant species replacement occurred strongly.The obtained results provide some a guideline for the sustainable management of bamboo forest.展开更多
Moose (Alces alces cameloides) is typically representative of the fauna of the frigid temperate zone and has been put on the Chinese second priority list of protected animals. The moose of northeast China is on the ...Moose (Alces alces cameloides) is typically representative of the fauna of the frigid temperate zone and has been put on the Chinese second priority list of protected animals. The moose of northeast China is on the southern most edge of its distribution in Asia. To study resource selection characteristics of moose and their response to human distur- bances and forest resource variables, the field work was conducted in Heilongiiang Provincial Shengshan Forestry Farm, which is located in the northwestern slope of Lesser Khingan Mountains, northeastern China, from January to March in both 2006 and 2007. A total of 428 plots were examined within the study area. Signs of moose use were found in 19 plots. Based on the analysis of resource selection function, we found that moose selected areas with higher densities of mixed deciduous broadleaf patch and mixed coniferous and broad leaf patch, and a higher NDVI value. Moose avoided settlement 6 km away and remained low probability of occurrence within 3 km from roads,展开更多
From July to September in 2005, the resources of Staphylinidae in four types of human disturbance regions ( human gathering area, grain for green re- gion, grazing region and rare disturbance region) in Erlang Mount...From July to September in 2005, the resources of Staphylinidae in four types of human disturbance regions ( human gathering area, grain for green re- gion, grazing region and rare disturbance region) in Erlang Mountain, Sichuan were investigated, and the individual number, species composition and diversity characteristics were analyzed. The result showed that the individual number, species diversity index (H') and the evenness index (J) decreased with the decrea- sing intensity of human disturbance. The species diversity index and the evenness index in human gathering area were the highest of 4.1301 6 and O. 850 2, respec- tively. Simpson predominant index (A) enhanced with the decreasing intensity of human disturbance, which reached the peak of 0. 199 6 in rare disturbance re- gion. The community similarity index/3 of Staphylinidae at different human disturbance regions ranged from 0 -0.25, indicating that the species compositions were extremely different among this four types of regions. Based on these results, it was found that human activities were closely related to individuals number and species dive^ity of Staphylinidae in Erlang Mountain, and human disturbance may add habitat heterogeneity and facilitate to the species diversity of Staphylinidae communi- ties.展开更多
Sand dune species were analyzed across two areas included in the “Roman Coastal State Nature Reserve” (Italy): Ostia (O) and Marina di Palidoro (P). Significant variations in species distribution, dry mass and size ...Sand dune species were analyzed across two areas included in the “Roman Coastal State Nature Reserve” (Italy): Ostia (O) and Marina di Palidoro (P). Significant variations in species distribution, dry mass and size over the gradient from the water-edge toward the inland between O and P were observed. Species colonize O, on an average, at 79 m from the water-edge extended along the gradient toward the inland over a length of 26 m. PD is 40.8 ± 9.9 plants.m-2. Ononis variegata and Elymus farctus have the highest PD (15.4 ± 1.3 plants.m-2), followed by Silene colorata and Sporobulus pungens (4.3 ± 3.9 plants.m-2), by Cakile maritima, Echinophora spinosa, Eryngium maritimum, Ammophila arenaria, Anthemis maritima, Cyperus capitatus, Medicago marina and Calystegia soldanella (.m-2), with C. soldanella having the lowest PD (0.02 plants.m-2). On an average, in P, the species colonize the dune at 17 m from the water-edge for a length of 46 m toward the inland, PD is on an average 21.5 ± 16.1 plants.m-2. S. pungens, E. farctus and O. variegata have the highest PD (6.0 ± <span展开更多
Despite almost half a century of research for theory of mind, its evolutionary origin is largely unknown. This paper proposes that the evolutionary origin of theory of mind starts from the beginning of the human evolu...Despite almost half a century of research for theory of mind, its evolutionary origin is largely unknown. This paper proposes that the evolutionary origin of theory of mind starts from the beginning of the human evolution to form hominins through bipedalism and the mixed habitat. The feet of the early hominins were still adapted for grasping trees rather than walking for long distances and running fast on the ground. The early hominins lived in the mixed habitat of grassy woodland with patches of denser forest, and freshwater springs. The difficulty of walking in the mixed habitat leads to division of labor for the home specialist group (small children, old people, and mothers with small children, and pregnant women) in the safe forest area and the exploration specialist group (young people without the care of small children) in the dangerous open area. The different tasks, attitudes, and mentalities in different specialist groups produce theory of mind as the ability to attribute different mental states to different specialist groups. (Uniformity of mind instead of theory of mind is for generalists without division of labor). The early Homo species with the open habitat developed theory of mind for hunter specialist group and gatherer specialist group. The middle Homo species with complex stone tools developed theory of mind for the cooperative specialist groups in the large production of complex stone tools. The late Homo species with complex social interaction developed theory of mind for mind reading to enhance cooperation and to detect cheaters in complex social interaction. For religion, the unusually harsh Upper Paleolithic Period developed theory of mind for imaginary specialists in terms of supernatural power, guidance, and comfort. Therefore, the three general types of theory of mind are for specialists in division of labor, mind reading in complex social interaction, and imaginary specialists in imaginary division of labor under harsh conditions. Self-awareness in the mirror self-recognition test is also explained.展开更多
<span style="font-family:Verdana;">Fiddler crabs are described as ecosystem engineers because of their burrow constructing ability. It was hypothesized that human activity will impact crab burrows. The...<span style="font-family:Verdana;">Fiddler crabs are described as ecosystem engineers because of their burrow constructing ability. It was hypothesized that human activity will impact crab burrows. The study area was delineated into lowly, medium and highly impacted plots. Crab holes were randomly counted and their width, length and surface area estimated. Burrow soils were collected and analyzed for Cadmium (Cd), Lead (Pb) and Zinc (Zn) using spectrophotometric method (HACH DR 890 colorimeter). The result indicates that burrow width was significantly different between impacted plots (P < 0.05). Lowly impacted plot had the largest width while highly impacted plot had the smallest width. In contrast, there was no significant difference in burrow length (P > 0.05), but highly impacted plot has the longest length while lowly impacted plot has the shortest length. Again, the surface area of crab burrow varies significantly (P < 0.05), and lowly impacted plot had the largest area (507.95 ± 61.84 cm</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">) followed by medium (390.30 ± 57.65 cm</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">) and high (265.16 ± 30.85 cm</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">) impacted plots. Similarly, lowly impacted area has more number of burrows (</span><i><span style="font-family:Verdana;">n </span></i><span style="font-family:Verdana;">= 55) followed by medium (</span><i><span style="font-family:Verdana;">n </span></i><span style="font-family:Verdana;">= 30) and highly (</span><i><span style="font-family:Verdana;">n</span></i><span style="font-family:Verdana;"> = 23) impacted plots. Highly impacted plot had the highest Cd and Pb concentration whereas lowly impacted plot had the highest Zn concentration. This implies that burrow morphology and chemistry exemplify the level of anthropogenic impact.</span>展开更多
文摘Sample plots were established in the principal forest types in the the Nevado de Toluca National Park, Mexico including those domi- nated by Pinus hartwegii, Abies religiosa, Quercus laurina and Alnus jorullensis. The vertical structure was defined by three strata in the coniferous forests and two strata in the broadleaved forests. Timber harvesting in Abies religiosa and Quercus laurina forests and fires generated by humans in Pinus hartwegii forests impeded the recruitment of saplings. Mature trees were also heavily impacted by logging in Pinus hartwegii forests. On the contrary, Alnusjorullensis forests were increas- ing due to the disturbance of Pinus and Quercus forests, as well aban- doned crop lands within the park. A combination of logging, uncon- trolled fire, and grazing appears to be compromising the recruitment of important tree species in this national park. These factors, together with human settlements, have also increased the proportion of early succes- sional species. Changes in forest structure from human disturbance indicate a need to control these activities if conservation goals are not to be compromised.
文摘Small mammals have been proposed playing an important role in the energy flow and regeneration of forest ecosystems. We compared species richness, diversity (H’) of small mammal communities and abundance of six dominant species of small mammals in disturbed and protected forests (four age classes: 6 - 10, 11 - 15, 16 - 20 and 31 - 40 years old) in China. We also investigated the structural variables (such as species richness, cover rate and abundance of shrubs and grasses) in the bottom layer, which considered to be important for small mammals and might be altered by human disturbance. The relationships between small mammals and these structural variables were examined to determine the potential effects of human disturbance on the small mammals in the restored forests. Our results indicated that the structure and composition of the vegetation in the bottom layer were simplified by human disturbance, while the abundance and cover rate of grasses were significantly increased. Although no significant differences were observed in species richness of small mammals between the protected and disturbed forests at the same age, the diversity index of small mammals in the protected forests was always significantly higher than in the disturbed forests. Regression showed that the species richness and diversity of small mammals increased with the species richness of shrubs, and was negatively correlated to the cover rate of grasses in the bottom layer. Human disturbance increased the total abundance of small mammals, and the increased cover rate of grasses in the bottom layer was beneficial to the abundance of small mammals. Obvious succession of small mammal communities occurred as the protected forest aged. In the protected forests, small ground-dwelling mammals (A. chevrieri, E. miletus and M. pahari) were the dominant species in the younger forests. Other mammals (T. belangeri, D. pernyi and C. erythraeus) gradually became the dominant species as the protected forests aged. However, in the disturbed forests, the smaller ground-dwelling mammals (T. belangeri, D. pernyi and C. erythraeus) were always the dominant species at all ages of the disturbed forests. Regression indicated that the cover rate of grasses in the bottom layer was beneficial to the three smaller body size and ground-dwelling small mammal species, while the shrubs were beneficial to the three bigger body size mammal species.
基金The present work was financially supported by National Key R&D Program(2018YFD0600104)Scientific Program of Zhejiang Province of China(2017C02016).
文摘Plant species diversity is an important index reflecting the functional complexity and stability of ecosystems.Human activity can completely alter plant species diversity and cause serious degradation of ecosystems but its impact on bamboo forest still lacks of systematic evaluation.In this study,we performed a field investigation to reveal the influences of human disturbances on the plant diversity and stability of Moso bamboo forests at Southern China.The selected bamboo fields contained different intensities of human activities that could be classified as slight,moderate and severe disturbance level.Species richness index S,Shannon-Wienner index H,Simpson index D,Pielou index Jsw,community similarity index IS and community stability index were employed to quantitatively evaluate the plant species diversity and stability.The survey revealed that there were 203 species belonging to 83 families and 108 genera in Moso bamboo forests.The number of plant species in the Moso bamboo forests decreased with the increasing of disturbance intensity.The species diversity indexes generally followed the order of slight>moderate>severe disturbance,as well as the richness index S,Shannon-Wienner index H and Pielou index Jsw.The similarity and species stability of the bamboo forest communities also decreased with the increase of the disturbance intensity.Under the severe disturbance,plant species replacement occurred strongly.The obtained results provide some a guideline for the sustainable management of bamboo forest.
基金financially supported by National Excellent Doctoral Dissertation of PR China-FANEDD(No.201069)""Program for New Century Excellent Talents in University–NCET(No.10-0310)""the Fundamental Research Funds for the Central Universities(No.DL12DA01)
文摘Moose (Alces alces cameloides) is typically representative of the fauna of the frigid temperate zone and has been put on the Chinese second priority list of protected animals. The moose of northeast China is on the southern most edge of its distribution in Asia. To study resource selection characteristics of moose and their response to human distur- bances and forest resource variables, the field work was conducted in Heilongiiang Provincial Shengshan Forestry Farm, which is located in the northwestern slope of Lesser Khingan Mountains, northeastern China, from January to March in both 2006 and 2007. A total of 428 plots were examined within the study area. Signs of moose use were found in 19 plots. Based on the analysis of resource selection function, we found that moose selected areas with higher densities of mixed deciduous broadleaf patch and mixed coniferous and broad leaf patch, and a higher NDVI value. Moose avoided settlement 6 km away and remained low probability of occurrence within 3 km from roads,
基金Supported by Open Fund of Ecological Environmental Research Center in the Chinese Academy of Sciences(SKLURE2011-2-3)Special Fund for Returned Overseas Students in China West Normal University(14B01)Project of HongK ong Ocean Park(HK09)
文摘From July to September in 2005, the resources of Staphylinidae in four types of human disturbance regions ( human gathering area, grain for green re- gion, grazing region and rare disturbance region) in Erlang Mountain, Sichuan were investigated, and the individual number, species composition and diversity characteristics were analyzed. The result showed that the individual number, species diversity index (H') and the evenness index (J) decreased with the decrea- sing intensity of human disturbance. The species diversity index and the evenness index in human gathering area were the highest of 4.1301 6 and O. 850 2, respec- tively. Simpson predominant index (A) enhanced with the decreasing intensity of human disturbance, which reached the peak of 0. 199 6 in rare disturbance re- gion. The community similarity index/3 of Staphylinidae at different human disturbance regions ranged from 0 -0.25, indicating that the species compositions were extremely different among this four types of regions. Based on these results, it was found that human activities were closely related to individuals number and species dive^ity of Staphylinidae in Erlang Mountain, and human disturbance may add habitat heterogeneity and facilitate to the species diversity of Staphylinidae communi- ties.
文摘Sand dune species were analyzed across two areas included in the “Roman Coastal State Nature Reserve” (Italy): Ostia (O) and Marina di Palidoro (P). Significant variations in species distribution, dry mass and size over the gradient from the water-edge toward the inland between O and P were observed. Species colonize O, on an average, at 79 m from the water-edge extended along the gradient toward the inland over a length of 26 m. PD is 40.8 ± 9.9 plants.m-2. Ononis variegata and Elymus farctus have the highest PD (15.4 ± 1.3 plants.m-2), followed by Silene colorata and Sporobulus pungens (4.3 ± 3.9 plants.m-2), by Cakile maritima, Echinophora spinosa, Eryngium maritimum, Ammophila arenaria, Anthemis maritima, Cyperus capitatus, Medicago marina and Calystegia soldanella (.m-2), with C. soldanella having the lowest PD (0.02 plants.m-2). On an average, in P, the species colonize the dune at 17 m from the water-edge for a length of 46 m toward the inland, PD is on an average 21.5 ± 16.1 plants.m-2. S. pungens, E. farctus and O. variegata have the highest PD (6.0 ± <span
文摘Despite almost half a century of research for theory of mind, its evolutionary origin is largely unknown. This paper proposes that the evolutionary origin of theory of mind starts from the beginning of the human evolution to form hominins through bipedalism and the mixed habitat. The feet of the early hominins were still adapted for grasping trees rather than walking for long distances and running fast on the ground. The early hominins lived in the mixed habitat of grassy woodland with patches of denser forest, and freshwater springs. The difficulty of walking in the mixed habitat leads to division of labor for the home specialist group (small children, old people, and mothers with small children, and pregnant women) in the safe forest area and the exploration specialist group (young people without the care of small children) in the dangerous open area. The different tasks, attitudes, and mentalities in different specialist groups produce theory of mind as the ability to attribute different mental states to different specialist groups. (Uniformity of mind instead of theory of mind is for generalists without division of labor). The early Homo species with the open habitat developed theory of mind for hunter specialist group and gatherer specialist group. The middle Homo species with complex stone tools developed theory of mind for the cooperative specialist groups in the large production of complex stone tools. The late Homo species with complex social interaction developed theory of mind for mind reading to enhance cooperation and to detect cheaters in complex social interaction. For religion, the unusually harsh Upper Paleolithic Period developed theory of mind for imaginary specialists in terms of supernatural power, guidance, and comfort. Therefore, the three general types of theory of mind are for specialists in division of labor, mind reading in complex social interaction, and imaginary specialists in imaginary division of labor under harsh conditions. Self-awareness in the mirror self-recognition test is also explained.
文摘<span style="font-family:Verdana;">Fiddler crabs are described as ecosystem engineers because of their burrow constructing ability. It was hypothesized that human activity will impact crab burrows. The study area was delineated into lowly, medium and highly impacted plots. Crab holes were randomly counted and their width, length and surface area estimated. Burrow soils were collected and analyzed for Cadmium (Cd), Lead (Pb) and Zinc (Zn) using spectrophotometric method (HACH DR 890 colorimeter). The result indicates that burrow width was significantly different between impacted plots (P < 0.05). Lowly impacted plot had the largest width while highly impacted plot had the smallest width. In contrast, there was no significant difference in burrow length (P > 0.05), but highly impacted plot has the longest length while lowly impacted plot has the shortest length. Again, the surface area of crab burrow varies significantly (P < 0.05), and lowly impacted plot had the largest area (507.95 ± 61.84 cm</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">) followed by medium (390.30 ± 57.65 cm</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">) and high (265.16 ± 30.85 cm</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">) impacted plots. Similarly, lowly impacted area has more number of burrows (</span><i><span style="font-family:Verdana;">n </span></i><span style="font-family:Verdana;">= 55) followed by medium (</span><i><span style="font-family:Verdana;">n </span></i><span style="font-family:Verdana;">= 30) and highly (</span><i><span style="font-family:Verdana;">n</span></i><span style="font-family:Verdana;"> = 23) impacted plots. Highly impacted plot had the highest Cd and Pb concentration whereas lowly impacted plot had the highest Zn concentration. This implies that burrow morphology and chemistry exemplify the level of anthropogenic impact.</span>