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Статті в журналах з теми "Lekh forests"
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Thingstad, Per Gustav, Marc Daverdin, and James D. M. Speed. "Modelling Capercaillie (Tetrao urogallus) lek sites distribution and their limiting factors in a central Norwegian managed forest landscape." Ornis Norvegica 41 (September 25, 2018): 1–12. http://dx.doi.org/10.15845/on.v41i0.1465.
Повний текст джерелаАнотація:
Forest management has substantially altered Fennoscandian forests through clear-cutting practices started during the 1950s. Impacts on the natural biodiversity in mature boreal forest have been inevitable. The Capercaillie (Tetrao urogallus) is often regarded as an indicator species for natural old growth forest, displaying on traditional lek sites during spring. In a heterogeneous forest landscape of two adjoining municipalities in central Norway we studied whether forest management or other environmental factors can have influenced the lek distribution. We identified 15 active leks and 12 recently abandoned leks. The maximum entropy distribution modelling (MaxEnt) was used to investigate factors associated with lek distribution at two different scales, where the scale reflecting the lek site areas gave the most adequate result. Active leks were predominantly associated with mature stands of forest. In 65% of the study area the habitat suitability for lekking was most influenced by forest management. Furthermore, the recently abandoned leks were found less frequently in low productive and mature forests than the still active ones, implying that previous leks in productive forest stands may have been lost through logging. Based on our data we have developed models for the predicted distribution and the current limiting factors, showing that altered forest management could improve lek site suitability in large parts of this boreal forest.
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Rolstad, Jørund, Per Wegge, Andrey V. Sivkov, Olav Hjeljord, and Ken Olaf Storaunet. "Size and spacing of grouse leks: comparing capercaillie (Tetrao urogallus) and black grouse (Tetrao tetrix) in two contrasting Eurasian boreal forest landscapes." Canadian Journal of Zoology 87, no. 11 (November 2009): 1032–43. http://dx.doi.org/10.1139/z09-093.
Повний текст джерелаАнотація:
Capercaillie ( Tetrao urogallus L., 1758) and black grouse ( Tetrao tetrix L., 1758 (= Lyrurus tetrix (L., 1758))) are two sympatric Eurasian lekking grouse species that differ markedly in habitat affinities and social organization. We examined how size and spacing of leks in pristine (Russia) and managed (Norway) forests were related to habitat and social behavior. Leks of both species were larger and spaced farther apart in the pristine landscape. Capercaillie leks were regularly spaced at 2–3 km distance, increasing with lek size, which in turn was positively related to the amount of middle-aged and older forests in the surrounding area. Black grouse leks were irregularly distributed at shorter distances of 1–2 km, with lek size explained by the size of the open bog arena and the amount of open habitat in the surroundings. At the landscape scale, spatial distribution of open bogs and social attraction among male black grouse caused leks to be more aggregated, whereas mutual avoidance in male capercaillie caused leks to be spaced out. In the pristine landscape, large-scale and long-term changes in forest dynamics owing to wildfires, combined with an aggregated pattern of huge bog complexes, presumably provide both grouse species with enough time and space to build up bigger lek populations than in the managed landscape.
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Saniga, M. "Ecology of the capercaillie (Tetrao urogallus) and forest management in relation to its protection in the West Carpathians." Journal of Forest Science 49, No. 5 (January 16, 2012): 229–39. http://dx.doi.org/10.17221/4697-jfs.
Повний текст джерелаАнотація:
Ecology of capercaillie (Tetrao urogallus) was studied in the mountains of Central Slovakia (West Carpathians) in 1981–2003. In the studied area, the capercaillie population inhabited especially old natural forests (100–250 years old) in the spruce-beech-fir (850–1,270 m a.s.l.) and spruce (1,250–1,530 m a.s.l.) vegetation zones. The overstorey stand age ranged between 80 and 250 years with the mean of 128 years. The understorey stand age ranged from 10 to 60 years. The overstorey tree density ranged between 200 and 1,050 stems per ha (mean 725). The understorey tree density ranged from 5 to 650 trees per ha (mean 290). Both males and females preferred old forests throughout the year. The results demonstrate a marked decrease (> 50%) in the numbers of cocks and hens on twelve monitored leks (28%) and a slight decrease (< 50%) on ten display grounds (24%). During the study period, capercaillie cocks became extinct on seven (16%) leks and in their surroundings. More or less constant numbers were found on twelve leks only (28%) and a slight increase occurred on two leks only (4%). A statistically highly significant correlation was found between the area of old-growth forest and the number of cocks attending a lek. In addition to forest deterioration predation appeared to be of major importance in limiting the numbers of capercaillies. Key points for forest management in relation to capercaillie protection are suggested.
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Loiselle, Bette A., John G. Blake, Renata Durães, T. Brandt Ryder, and Wendy Tori. "Environmental and Spatial Segregation of Leks Among Six Co-Occurring Species of Manakins (Pipridae) in Eastern Ecuador." Auk 124, no. 2 (April 1, 2007): 420–31. http://dx.doi.org/10.1093/auk/124.2.420.
Повний текст джерелаАнотація:
AbstractEnvironmental correlates and geographic spacing of leks were compared for six species of manakins (Pipridae) on two 100-ha study plots in eastern Ecuador. The “hotspot” hypothesis of lek evolution suggests that males should aggregate where females are most likely to be encountered. For ecologically similar species that co-occur at a site, leks are predicted to be clustered in space and, thus, to overlap in macroscale environmental characteristics. The geographic spacing and environmental characteristics of lek sites we observed were inconsistent with the hotspot hypothesis for lek evolution. In general, little geographic overlap occurred among leks, and geographic spacing of leks among heterospecifics more closely fit a regular than a clumped pattern. Further, environmental conditions of leks varied among species with respect to elevation and topography. Leks of some species were more likely to occur on hilltops or ridge tops (e.g., Machaeropterus regulus, Pipra erythrocephala), whereas others appeared to prefer highly dissected drainages (e.g., P. pipra), relatively flat terrain near streams (e.g., Chiroxiphia pareola), or seasonally inundated forests (e.g., P. filicauda). Using randomly placed leks, we found evidence that certain lek environments may be limited, which is consistent with observed levels of population abundances on the two plots. Such environmental limits may constrain lek placement and size. Further study is needed to determine the reproductive implications of placing leks in apparently suboptimal environments, though such compromises may reflect males making the best of a bad situation.Segregación Ambiental y Espacial de las Asambleas de Cortejo Entre Seis Especies Simpátricas de Saltarines (Pipridae) en el Oriente de Ecuador
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Alonso, José Alvarez. "Short Communications the Breeding System of the Orange-Crowned Manakin." Condor 102, no. 1 (February 1, 2000): 181–86. http://dx.doi.org/10.1093/condor/102.1.181.
Повний текст джерелаАнотація:
Abstract I studied the lek organization and courtship displays of the Orange-crowned Manakin (Heterocercus aurantiivertex) in undisturbed, lowland rain forest in northeastern Peru. The majority of leks were in seasonally flooded or swampy forest, and most were situated around the borders of old ox-bow lakes. Males maintain loosely packed courts inside exploded leks or “quasi leks,” which may extend for more than 1 km. Within leks, males vocalize throughout the day and occasionally perform two distinctly different solitary displays. One is a spectacular aerial performance that begins above the canopy. The “log display” is performed just above ground- or water-level and consists of a series of short, ritualized jumps.
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Habibzadeh, Nader, and Omid Rafieyan. "Land-cover patterns surrounding Caucasian grouse leks in Arasbaran region, East Azerbaijan, Iran." Wildlife Research 43, no. 3 (2016): 267. http://dx.doi.org/10.1071/wr15181.
Повний текст джерелаАнотація:
Context To create management strategies with the goal of sustaining a species such as Caucasian grouse (Lyrurus mlokosiewiczi), it is important to identify the habitat requirements of species, not just in terms of a correlation with a given habitat feature, but also the relationship between species presence and vegetation coverage, proximity to other habitat types, and importance at different spatial scales. Aims To predict the proportions and spatial configuration of major habitat types that are associated with high probabilities of Caucasian grouse lek occurrence. Methods Using minimum mapping-unit scale (i.e. grain) for land cover, we applied spatial analysis at three spatial extents (472-, 702- and 867-m-radius circles) to assess how the importance of different land-cover patterns and patch characteristics surrounding leks of Caucasian grouse changed with scale within the Arasbaran landscape (316.56 km2) in East Azerbaijan, Iran. A set of a priori models has been developed on the basis of landscape metrics linked to hypotheses that could explain the spatial pattern of Caucasian black habitat use at each scale. We used an information-theoretic approach based on Akaike’s information criterion (AIC) within a general additive models framework to model habitat selection, so as to compare the values of landscape metrics calculated for Caucasian grouse lek sites (n = 22) with those calculated for non-lek points (n = 44). Key results The probability of lek occurrence at each of the spatial scales increases with a larger amount of open, young forests in the landscape. At each scale, we could indicate the landscape composition and structure required to create an ideal habitat mosaic for Caucasian grouse. Such an ideal habitat mosaic within mountain forests of Arasbaran, for a 702-m-radius area around a potential lek site, would consist of non-square (i.e. more geometrically complex) patches of rangeland cover and deciduous stands with canopy cover of <50%, which encompass over 30% of landscape. Conclusions Our results identified differences in black grouse requirements at several scales within the landscape. We believe this will help managers improve the habitat focusing on the area around existing or inactive leks, to adapt the landscape to species requirements, and to encourage targeting new sites. Implications These findings demonstrated that not only can we identify important landscape requirements at a range of scales, but by characterising landscape composition and structure across these scales, forest managers can help prioritise combinations of habitats that best serve the conservation of the target species.
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Saniga, M. "Habitat features of the capercaillie (Tetrao urogallus) leks in the West Carpathians." Journal of Forest Science 48, No. 9 (May 22, 2019): 415–24. http://dx.doi.org/10.17221/11903-jfs.
Повний текст джерелаАнотація:
Habitat characteristics of 43 capercaillie (Tetrao urogallus) leks were studied in the mountains of Central Slovakia (West Carpathians) in 1984–2002. Macro-habitat was described with respect to topography and succession stage. Micro-habitat was described with respect to forest type and forest stand structure. Twenty-seven out of forty-three display grounds were situated in the upper half of the lateral ridges. Sixteen leks were located on hills of the lateral ridges (slope < 10%). All the leks were situated in old succession stages of the forest (80–200 years old). Twenty-seven display grounds were located in natural forests, sixteen leks were situated in man-managed stands more than 80 years old. Leks were situated in a variety of forest types with overstorey tree-density between 400–1,050 stems per ha. Distribution of leks was limited above all by macro-habitat characteristics (elevated sites, old stands). Age-space structure seemed to be a significant micro-habitat feature (preference of multi-layered stands).
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Jahn, Olaf, Edwin E. Vargas Grefa, and Karl-L. Schuchmann. "The life history of the Long-wattled Umbrellabird Cephalopterus penduliger in the Andean foothills of north-west Ecuador: leks, behaviour, ecology and conservation." Bird Conservation International 9, no. 1 (March 1999): 81–94. http://dx.doi.org/10.1017/s0959270900003373.
Повний текст джерелаАнотація:
SummaryThe rare and threatened Long-wattled Umbrellabird Cephalopterus penduliger inhabits the canopy and mid-storey level of humid to wet foothill and montane forests (150–1,800 m)of the Andean slopes of south-west Colombia and western Ecuador. Here we report on male activity pattern and display behaviour observed at one of two leks recently discovered in the vicinity of Playa de Oro, Rio Santiago, Esmeraldas Province, north-west Ecuador. Courtship behaviour of C. penduliger is compared with the Central American and Amazonian congeners (Bare-necked Umbrellabird C. glabricollis and Amazonian Umbrellabird C. ornatus). The lek of C. penduliger was active during the whole study period (February 1997 to January 1998), but both lek structure and daytime activity pattern changed markedly within the observation period.
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Cestari, César, and Marco Aurélio Pizo. "Seed dispersal by the lek-forming white-bearded manakin (Manacus manacus, Pipridae) in the Brazilian Atlantic forest." Journal of Tropical Ecology 29, no. 5 (July 19, 2013): 381–89. http://dx.doi.org/10.1017/s0266467413000412.
Повний текст джерелаАнотація:
Abstract:The movement patterns of males, females and juveniles of lekking species often differ due to differences in the commitment to lek activities, which may lead to differences in the spatial distribution and dispersal distances of seeds they eat. By sampling seeds in three lek and non-lek areas of the white-bearded manakin (Manacus manacus), we tested whether this lekking species increased the abundance and species richness of seeds in lek areas and, at a finer scale, in 21 displaying courts within lek areas. Combining data on seed defecation or regurgitation rates by free-ranging individuals, the number of seeds in droppings or regurgitations of mist-netted birds, and the distances travelled by birds equipped with radio-transmitters, we estimated the potential spatial distribution of seeds generated by six resident males and six females or juveniles during the morning peak of lek activity and when lek activity decreased in the afternoon. There was no difference in the species richness (46 and 44 morphospecies, respectively) and abundance of seeds (15.4 ± 7.3 seeds and 14.0 ± 1.1 seeds, respectively) between lek and non-lek areas. Within leks both parameters increased in courts (45 spp., 17.6 ± 14 seeds) compared with non-court sites (22 spp., 1.9 ± 1.8 seeds), likely as a consequence of the longer time spent by resident males in perches in or near display courts. Distances moved by juveniles and females per 60-min period (183 ± 272 m) were greater than resident males (42.6 ± 22.0 m) in the mornings, while the opposite happened in the afternoons (55.2 ± 40.7 m and 157 ± 105 m, respectively). We conclude that the spatial aggregation of seeds in lek areas of M. manacus occurs at the court level, and the spatial distribution of deposited seeds varies with manakin lekking status and the daily period of foraging.
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Castro-Astor, Ivandy N., Maria Alice S. Alves, and Roberto B. Cavalcanti. "Display Behavior and Spatial Distribution of the Red-Headed Manakin in the Atlantic Forest of Brazil." Condor 106, no. 2 (May 1, 2004): 320–35. http://dx.doi.org/10.1093/condor/106.2.320.
Повний текст джерелаАнотація:
AbstractWe studied the display behavior and spatial distribution of the Red-headed Manakin (Pipra rubrocapilla, Pipridae) in the Atlantic Forest of the state of Rio de Janeiro, Brazil. The average distance between display sites was 72.5 ± 34.1 m (n = 11, range = 34.0–157.0 m). The study area included one 13-site lek and two solitary display sites. All sites of the same lek were within earshot of at least one other site. Males occupied the same display sites between years. The dispersion pattern of males is typical of exploded or dispersed leks. Males were more likely to interact with their nearest neighbor than with males from more distant display sites. Red-headed Manakin lekking behavior is remarkably complex, including 11 display elements, two of them not found in other members of the P. erythrocephala clade, nine vocalizations, and one mechanical sound previously undescribed in the Red-headed Manakin. The males performed both solitary displays and coordinated displays with other males on both their own display sites and on those of the other males. Most of the time, two definitive-plumaged males displayed together. The displays, vocalizations, and mechanical sound recorded in this study contribute to our understanding of the evolution of display behavior in manakins, mainly to the members of the P. erythrocephala clade.Despliegue de Cortejo y Distribución Espacial de Pipra rubrocapilla en la Mata Atlántica de BrasilResumen. Estudiamos el despliegue de cortejo y la distribución espacial de Pipra rubrocapilla (Pipridae) en el área de la Mata Atlántica del Estado de Río de Janeiro, Brasil. La distancia promedio entre los lugares de cortejo fue de 72.5 ± 34.1 m (n = 11, rango = 34.0–157.0). El área de estudio incluyó un lek con 13 lugares de cortejo y dos lugares de cortejo aislados. Desde un lugar de cortejo en un lek se podía oir la vocalización del vecino más próximo. Los machos ocuparon los mismos lugares de cortejo durante años, y presentaron la distribución espacial típica de los leks dispersos. Observamos más interacciones entre los machos de los lugares de cortejo más próximos. El despliegue de cortejo de P. rubrocapilla es muy complejo, incluyendo 11 elementos de cortejo (dos de ellos no descritos para otras especies del clado P. erythrocephala), nueve vocalizaciones y un sonido mecá nico, que hasta el momento, no había sido registrado para P. rubrocapilla. Los machos ejecutan despliegues de cortejo solitarios y despligues coordinados con otros machos en sus lugares de cortejo y en los de otros machos. La mayoría de las veces, el despliegue de cortejo es praticado por dos machos adultos. El despliegue de cortejo, las vocalizaciones y el sonido mecánico registrados en este estudio contribuyen al entendimiento de la evolución del despliegue de cortejo en los pípridos, principalmente en las especies que conforman el clado de P. erythrocephala.
Дисертації з теми "Lekh forests"
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Jackson, William James. "The dynamics of lekh forest use in the middle hills of Nepal /." [Richmond, N.S.W.] : Centre for Systemic Development, Faculty of Environmental Management and Agriculture, University of Western Sydney, Hawkesbury, 1999. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030520.101936/index.html.
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Jackson, William James, of Western Sydney Hawkesbury University, Faculty of Environmental Management and Agriculture, and Centre for Systematic Development. "The dynamics of lekh forest use in the Middle Hills of Nepal." THESIS_FEMA_CSD_Jackson_W.xml, 1999. http://handle.uws.edu.au:8081/1959.7/673.
Повний текст джерелаАнотація:
Extending Nepal's community forestry programme and its protected area network into lekh forests has been hampered by the assumption that people who live in or near lekh forests treat them as unregulated open access resources. This study tests this assumption by examining the interaction between local people and forests in two lekh areas of the central Middle Hills. The research is comprised of an action research approach, a theoretical framework of ecological anthropology that was also informed by forestry science, and tools and methods drawn from ethnographic fieldwork and rapid rural appraisal. The belief that lekh forests are treated as unregulated open access is challenged by demonstrating that there are clearly defined local use rights to lekh forests. Access to forest resources is regulated by forest users and relatively sophisticated and dynamic indigenous systems of forest management have been developed. The potential for implementing community forestry in the two lekh areas was explored by incorporating an element of action research in the study. A number of challenges are highlighted for the Nepal government to facilitate the improved management and conservation of lekh forests while ensuring an equitable flow of benefits to the people who depend on these forests.Doctor of Philosophy (PhD)
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Peck, Riley D. "Seasonal Habitat Selection by Greater Sage Grouse in Strawberry Valley Utah." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3180.
Повний текст джерелаАнотація:
This study examined winter habitat use and nesting ecology of greater sage grouse (Centrocercus urophasianus) in Strawberry Valley (SV), Utah located in the north-central part of the state. We monitored sage grouse with the aid of radio telemetry throughout the year, but specifically used information from the winter and nesting periods for this study. Our study provided evidence that sage grouse show fidelity to nesting areas in subsequent years regardless of nest success. We found only 57% of our nests located within the 3 km distance from an active lek typically used to delineate critical nesting habitat. We suggest a more conservative distance of 10 km for our study area. Whenever possible, we urge consideration of nest-area fidelity in conservation planning across the range of greater sage grouse. We also evaluated winter-habitat selection at multiple spatial scales. Sage grouse in our study area selected gradual slopes with high amounts of sagebrush exposed above the snow. We produced a map that identified suitable winter habitat for sage grouse in our study area. This map highlighted core areas that should be conserved and will provide a basis for management decisions affecting Strawberry Valley, Utah.
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Owen, Jenny. "Provision of habitat for black grouse Tetrao tetrix in commercial forest restocks in relation to their management." Thesis, University of Stirling, 2011. http://hdl.handle.net/1893/3444.
Повний текст джерелаАнотація:
As planted forests mature and are clearfelled in patches, second rotation tree crops (restocks) become available to black grouse, a species of conservation concern in the UK. Currently, only a limited amount is known about the resources provided by this habitat to black grouse and their broods. The aims of this study therefore, were to investigate the recovery of field-layer vegetation and the invertebrate population from restock through to canopy closure of planted trees, assess the duration of habitat availability and food resources to black grouse, and understand how forest management could improve provision. Changes to the abundance of predators resulting from habitat management were also considered. The comparative habitat quality of restocks was assessed in a wider landscape context. Field-layer vegetation in 72 restocks in two afforested areas in the north-east and the south-west of the Scottish Highlands was surveyed. On average, only 60% of ground in restocks was re-planted with second rotation trees, with the remainder left unplanted. Initial vegetation recovery was generally impeded by timber harvest residues (mainly brash), which comprised up to 50% of total ground cover two years after restock. Increased cover of heather Calluna vulgaris, often an important component of black grouse habitat, and decreased brash cover were recorded in areas of restocks where first-rotation timber was removed by cable-winch (compared with harvester and forwarder removal) and in planted areas (compared with areas left unplanted). Bilberry Vaccinium myrtillus and cotton grass Eriophorum spp. occurrence was recorded infrequently irrespective of restock age or management. Heather generally dominated the field-layer six years after restock, reaching a height and density reported to be suitable for black grouse nesting and brood cover in other studies. The onset of tree canopy closure as early as eight years suggests that suitable black grouse habitat availability in restocks is likely to be severely limited in duration. Brash removal, or break-up and re-distribution of the brash layer, positively affected the recovery of field-layer vegetation species potentially of use to black grouse. Extending the fallow period prior to restock resulted in an extended period of suitable habitat available to black grouse prior to canopy closure. However, habitat created by extending the fallow period also attracted a higher number of mammalian predators of black grouse. In the longer term, areas of restocks left unplanted should provide a valuable open-ground resource after canopy closure of the planted crop, although results suggest that management to prevent encroachment of naturally regenerating non-native trees is likely to be necessary. Invertebrate taxa selected by chicks in previous black grouse studies were available in all ages of restock studied. Taxa abundance differed as restocks aged and field-layer vegetation developed, although contrasting habitat preferences of taxa meant that each was affected differently by restock management. No single forest management method positively increased abundance of all taxa. Abundance of Lepidoptera larvae, a key food item for black grouse chicks, was positively related to dwarf shrub cover. An extended fallow period prior to restock should prolong increased larvae availability to chicks. Provision of preferred field-layer vegetation habitat and invertebrate abundance in restocks was comparable to habitat surrounding leks - areas likely to be occupied and utilised by black grouse. Restocks had a comparatively low occurrence of key plant species, including bilberry Vaccinium myrtillus and cotton grass Eriophorum spp. Cover of the dwarf shrub bog myrtle Myrica gale, positively associated with Lepidoptera larvae abundance in habitat surrounding leks, was absent from restocks. The abundance of other invertebrate taxa considered was similar between leks and restocks. Study findings are discussed with reference to black grouse conservation and commercial forestry systems in Europe. Management recommendations to improve habitat for black grouse in second rotation planted forests in Britain are provided.
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Jackson, William J. "The dynamics of lekh forest use in the Middle Hills of Nepal." Thesis, 1999. http://handle.uws.edu.au:8081/1959.7/673.
Повний текст джерелаАнотація:
Extending Nepal's community forestry programme and its protected area network into lekh forests has been hampered by the assumption that people who live in or near lekh forests treat them as unregulated open access resources. This study tests this assumption by examining the interaction between local people and forests in two lekh areas of the central Middle Hills. The research is comprised of an action research approach, a theoretical framework of ecological anthropology that was also informed by forestry science, and tools and methods drawn from ethnographic fieldwork and rapid rural appraisal. The belief that lekh forests are treated as unregulated open access is challenged by demonstrating that there are clearly defined local use rights to lekh forests. Access to forest resources is regulated by forest users and relatively sophisticated and dynamic indigenous systems of forest management have been developed. The potential for implementing community forestry in the two lekh areas was explored by incorporating an element of action research in the study. A number of challenges are highlighted for the Nepal government to facilitate the improved management and conservation of lekh forests while ensuring an equitable flow of benefits to the people who depend on these forests.
Книги з теми "Lekh forests"
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Sư̄mūanchon, Kō̜ng Bannāthikān Nangsư̄phim. Lōk bai yai khō̜ng khon tūa lek: Rūam sārakhadī chœ̄ng khāo radap mư̄ rāngwan. Krung Thēp: Samnakphim ʻInthanin, 2011.
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Ke-ʻets ba-afelat ha-yaʻar: ʻal ahavoteha shel Leʼah Goldberg ṿe-hishtaḳfutan be-shireha = Like a tree in a dark forest : the loves of Leah Goldberg and their reflections in her poetry. Yerushalayim: Hotsaʼat Shoḳen, 2013.
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Leah Let's Meet Some Delightful Jungle Animals!: Personalized Kids Books with Name - Tropical Forest and Wilderness Animals for Children Ages 1-3. Independently Published, 2020.
Знайти повний текст джерелаЧастини книг з теми "Lekh forests"
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"Participatory forest management in Mendha Lekha, India." In Ecological Economics from the Ground Up, 234–59. Routledge, 2013. http://dx.doi.org/10.4324/9780203076989-20.
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Searle, Mike. "Frozen Rivers and Fault Lines." In Colliding Continents. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199653003.003.0010.
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After seven summer field seasons working in the north-western Himalaya in India, I had heard of a winter trade route that must rank as one of the most outlandish journeys in the Himalaya. The largely Buddhist Kingdoms of Ladakh and Zanskar are high, arid, mountainous lands to the north of the Greater Himalayan Range and in the rain shadow of the summer monsoon. Whereas the southern slopes of the Himalaya range from dense sub-tropical jungles and bamboo forests to rhododendron woods and magnificent alpine pastures carpeted in spring flowers, the barren icy lands to the north are the realm of the snow leopard, the yak, and the golden eagles and lammergeier vultures that soar overhead. The Zanskar Valley lies immediately north-east of the 6–7,000-metre-high peaks of the Himalayan crest and has about thirty permanent settlements, including about ten Buddhist monasteries. I had seen the Zanskar Ranges from the summit of White Sail in Kulu and later spent four summer seasons mapping the geology along the main trekking routes. In summer, trekking routes cross the Himalaya westwards to Kashmir, southwards to Himachal Pradesh, and northwards to Leh, the ancient capital of Ladakh. Winter snows close the Zanskar Valley from the outside world for up to six months a year when temperatures plummet to minus 38oC. Central Zanskar is a large blank on the map, virtually inaccessible, with steepsided jagged limestone mountains and deep canyons. The Zanskar River carves a fantastic gorge through this mountain range and for only a few weeks in the middle of winter the river freezes. The Chaddur, the walk along the frozen Zanskar River, takes about ten to twelve days from Zanskar to the Indus Valley and, in winter time, was the only way in or out before the road to Kargil was constructed. I mentioned this winter trek to Ben Stephenson during our summer fieldwork in Kishtwar and he stopped suddenly, turned around, and said ‘Mike we just have to do this trek!’ So the idea of a winter journey into Zanskar was born, and four of us set off from Oxford in January 1995.
Тези доповідей конференцій з теми "Lekh forests"
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Pasquali, Adriane Rodrigues De Morais, and Talita Vieira Braga. "DIMORFISMO SEXUAL MORFOMÉTRICO DE DIXIPHIA PIPRA." In I Congresso Brasileiro de Biodiversidade Virtual. Revista Multidisciplinar de Educação e Meio Ambiente, 2021. http://dx.doi.org/10.51189/rema/1087.
Повний текст джерелаАнотація:
Introdução: Características morfológicas dos seres vivos são aspectos que permitem avançar na compreensão de questões evolutivas, reprodutivas e comportamentais relacionadas com a Teoria da Seleção Sexual. Objetivo: o estudo visou verificar se existe diferença sexual em Dixiphia pipra, uma espécie de ave da família Pipridae, que são conhecidas por seu comportamento reprodutor em lek, com elaboradas exibições de cortejo. Metodologia: Informações morfológicas que melhor representam a diferença sexual, como a massa corporal (g), o comprimento total do corpo (mm) e o comprimento da asa (mm), foram obtidas em um banco de dados morfológicos de espécies de aves da Mata Atlântica. Resultados: A partir de registros que foram obtidos na ecorregião Bahia Coastal Forests foi verificado que os sexos não são diferentes entre si (massa corporal: p = 0,069, comprimento total do corpo: p = 0,067, comprimento da asa: p = 0,204). Entretanto, apesar de estatisticamente iguais, pode-se verificar que existiu uma tendência dos machos serem menores que as fêmeas, tanto para o tamanho total do corpo (fêmeas: m = 100,9 mm, n = 12 e machos: m = 95,0 mm, n = 11), quanto para a massa corporal (fêmeas: m = 13,1 g, n = 12 e machos: m = 12,2 g, n = 12). A diferença na massa corporal já havia sido registrada para o bioma amazônico, com machos mais leves que fêmeas (fêmeas: m = 11,9 g, machos: m = 11,2), enquanto o comprimento da asa também não apresentou diferença. Discussão e conclusão: A diferença morfológica entre os sexos, mesmo que pequena, pode ser relevante para essa espécie. Apesar das diferenças observadas na Mata Atlântica e na Amazônia serem no sentido contrário ao esperado pela Teoria da Seleção Sexual, que seria machos maiores que as fêmeas, para D. pipra machos menores pode os tornar mais ágeis em suas exibições durante a dança pré-nupcial. Além disso, é relevante destacar que a diferença da massa corporal verificada entre os dois biomas pode ocorrer devido a fatores como condições ambientais, alimentação, migração, muda de penas e reprodução.