Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 20

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  conservation status
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Small scale conservation status in forests - source of bark beetle problems?

100%
Zolubas P., Dagilius R.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2012
|
tom 11
|
nr 1
Using GIS techniques, spruce bark beetle Ips typographus (L.) damage was analysed against distance from the edge of small spruce stands with strict protection regime; for reference damage nearby managed spruce stands was used. Mean volume of spruce timber, harvested with sanitary fellings was significantly higher near spruce stands with strict conservation status (14.7 ±2.1 to 17.0 ±3.8 m3/ha) than in the vicinity of managed control sites (9.9 ±0.4 to 11.5 ±0.8 m3/ha). Under endemic spruce bark beetle population levels strict conservation regime in small areas (forest woodland key habitats of average 3.7 ha size) was found to be Ips typographus hazard for adjacent spruce forests up to 450 m distance.
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Ethnomedicinal and conservation status of herbs in tehsil Banda Daud Shah, District Karak, Pakistan

100%
Musharaf K., Abdurehman, Hussain F., Shinwari Z. K., Musharaf S.
International Letters of Natural Sciences
|
2014
|
tom 15
|
nr 2
The present study documents the ethnomedicinal and conservation status of 91 herbs belonging to 81 genera and 66 families in tehsil Banda Daud Shah during 2012-2013. The information about conservation and ethnobotanical was collected through questioners and personal interviews during fieldwork using the IUCN 2001, Red Data List Categories and Criteria. Among these 36 species were found to be rare, vulnerable (30 species), infrequent (13 species), endangered (8 species) and dominant (4 species). From the present investigation we concluded that most plant species are going to become endangered because the natural vegetation area was change into urbanization.
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Carex disperma Dewey versus Carex loliacea L. (Cyperaceae): distribution dynamics and conservation status in Poland

84%
Pawlikowski P.
Acta Societatis Botanicorum Poloniae
|
2010
|
tom 79
|
nr 4
Carex disperma Dewey reaches its south-eastern range limit in north-eastern Poland. It has often been confused with Carex loliacea L. In this paper the diagnostic features of both species are presented. A total of about 47 reliable localities of C. disperma were recorded within the present borders of Poland. Less than one-third of them have only been confirmed recently. They are aggregated in large forest complexes in north-eastern Poland (Romincka, Białowieża, Borki, Augustów and Knyszyn Forests). A list of localities of C. disperma based on herbarium records, credible literature data and the author's own data is provided, as well as maps of distribution of both C. disperma and C. loliacea in Poland. The existence of C. disperma × C. loliacea hybrid was not confirmed. Considering the number of localities, dynamics and population sizes of both species it is clear that C. disperma is a species with higher conservation value than C. loliacea. Unlike C. disperma, the latter species is not threatened with extinction in Poland. The resources of C. disperma are very limited and the species needs conservation measures such as creating sufficiently large nature reserves where appropriate hydrological conditions can be maintained.
4

Predicted distributions, niche comparisons, and conservation status of the spotted linsang (Prionodon pardicolor) and banded linsang (Prionodon linsang)

84%
Jennings A. P., Veron G.
Acta Theriologica
|
2015
|
tom 60
|
nr 2
Knowledge of a species’ distribution and habitat preferences is of paramount importance when assessing its conservation status. We used accurately recorded occurrence records and ecological niche modeling to predict the distribution of two poorly known small carnivore species that occur in Asia, the spotted linsang (Prionodon pardicolor) and banded linsang (Prionodon linsang), and analyzed their niche overlaps for habitat and elevation. We then assessed the loss of their suitable habitat and estimated the proportion of predicted presence under protected areas. We identified and assessed possible anthropogenic threats, and used our modeling predictions to recommend surveying priorities. Our study confirmed that these two linsangs are geographically separated, with no known overlap of their distributions. Our results indicated that the habitat and elevation niches of these two linsangs are similar: they both occur primarily in evergreen forest and can be found at all elevations up to around 3,000 m. Although these two linsangs might be allopatric due to intense interspecific competition between them, other explanations could explain their distribution patterns, such as biogeographical and ecological barriers. Our findings suggest that these two linsangs might be threatened by the loss, degradation, and fragmentation of tropical evergreen forests. Urgent field studies are thus needed to learn more about their habitat requirements and the impact of anthropogenic threats, including tropical forest disturbance and hunting.
5
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Ecology and conservation status of Taxus baccata population in NE Chalkidiki, northern Greece

84%
Katsavou I., Ganatsas P.
Dendrobiology
|
2012
|
tom 68
Taxus baccata L. is a rare species threatenedwith extinction in Greece, as in other parts of Europe. This paper deals with the ecological status of the species in the area of NE Chalkidiki northern Greece, where the species appears in one of the greatest populations of the country. Site, standand yew population characteristics were studied in the area that species occupies. Eleven sample plots were marked, and on each plot, the height and diameter at breast height (DBH) were measured for all yew trees, as well as for all the individuals of the rest tree species, with diameter at breast height greater than 4 cm. Tree vitality of all trees was also estimated according to IUFRO classification. Yew radial growth was studied using tree-ring analysis. Tree natural regeneration was investigated within subplots of different dimensions and according to two height classes. Results showed that yew population occurs in stands dominated by beech, presenting a mean density of 301 trees per hectare, with a total population of 430 trees with DBH above 4 cm. It forms the secondary stand, and dominates in the stand understorey, accompanied with Fagus sylvatica and Ilex aquifolium, while it appears rarely in the overstorey. Yew tree vitality was foundto be quite high, and significantly higher than that of beech. Radial growth of the sampled trees follows a slow and constant annual increment gradually decreasing by tree age. Yew natural regeneration was foundto be relatively low, 1341.8 individuals (seedlings and saplings up to 1 m) per hectare. Management and in situ conservation of the species in the area should focus on species protection measures, andon specific silvicultural treatments for creating favourable conditions for species growth.
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Ethnomedicinal and conservation status of plant species in Tehsil Takht Bhai, District Mardan, Pakistan

84%
Khan M., Musharaf S.
International Letters of Natural Sciences
|
2015
|
tom 37
The study was design to draw attention to correlation of locals with plants and their conservation status. The research work was carried out in tehsil Takht Bhai, district Mardan during 2008-2010. Fieldwork was conducted using an arrangement of interviews, questioners and personal observation. The IUCN 2001, Red Data List Categories and Criteria was used to determine the conservation status of plants. The present study documents the ethno medicinal and conservation status of 34 plant species belonging to 20 families. Among these 12 species were found to be rare, vulnerable (11 species), endangered (9 species) and Infrequent (2 species). From this study we have concluded that most plant species are going to become endangered and no one plant specie was found dominant because the natural vegetation area was change into urbanization and agricultural reason.
7

Distribution and conservation status of loaches in Hungary

84%
Eros T., Sallai Z., Kotusz J.
Folia Biologica
|
2003
|
tom 51
|
nr Suppl.
8

Stan zachowania dawnych założeń parku ziemskiego w Szymonowie

67%
Wazbinska J.
Acta Scientiarum Polonorum. Administratio Locorum
|
2010
|
tom 09
|
nr 3
9

In silico analysis of the biodiversity and conservation status of mitochondrial cytochrome C oxidase subunit 1 (CO1) gene of Taenia multiceps

67%
Kilinc S. G., Celik F., Kesik H. K., Simsek S.
Acta Parasitologica
|
2020
|
tom 65
|
nr 4
10

Comparative analysis of the bryophyte floras of northwest Belarus concrete fortification and the Carpathians

67%
Sakovich A., Rykovsky G.
Biodiversity: Research and Conservation
|
2011
|
tom 24
11

Distribution, relative abundance, and conservation status of the large flying fox, Pteropus vampyrus, in peninsular Malaysia: a preliminary assessment

67%
Mohd-Azlan J., Zubaid A., Kunz T. H.
Acta Chiropterologica
|
2001
|
tom 03
|
nr 2
An 11-month survey was undertaken to assess the relative abundance and distribution of the large flying fox, Pteropus vampyrus, in peninsular Malaysia. A total of 115 locations were visited based on sites that were identified from personal observations, published records, and information obtained from local villagers and wildlife and forestry personnel. Our survey suggests a severe decline in the abundance and distribution of P. vampyrus throughout peninsular Malaysia. At nearly half of all sites visited, there were no recent records or observations of this species. Several sites were used on a seasonal basis, others appeared to have been abandoned due to disturbance or habitat loss, and still others may have been extirpated by hunting. Most extant colonies are presumably located deep in isolated and inaccessible forests and in dense riparian vegetation such as mangrove and freshwater swamps. We suggest that unregulated hunting and habitat loss are the primary reasons for the decline in abundance of this species in peninsular Malaysia. Inadequacies in existing laws should be addressed and a public awareness program launched so that an effective conservation and management plan can be formulated to ensure the long-term survival of this ecologically important species.
12

Recent surveys of bats (Mammalia: Chiroptera) from China. II. Pteropodidae

67%
Zhang J.-S., Jones G., Zhang L.-B., Zhu G.-J., Zhang S.-Y.
Acta Chiropterologica
|
2010
|
tom 12
|
nr 1
We review the distribution and conservation status of Old World fruit bats (Pteropodidae) in tropical and subtropical China. Our results are based on a series of surveys conducted between 1999 and 2008 by Chinese researchers and international collaborators, spanning almost the entire range of pteropodids within China over nine provinces. Additionally we provide new information on morphometrics and notes on ecology. We also review earlier Chinese literature on fruit bats because much of this has previously been inaccessible to western scientists, and we evaluate the reliability of some of these older records. Thirteen species of fruit bats have been reputed to occur in China, including one species restricted to Taiwan. We classified Chinese fruit bats according to distribution and status as follows: Resident (six species, including one species formerly found in Taiwan and now restricted to its neighbouring islands), Marginal (three species), Questionable (one species) and Alien (three species). Consequently, only five species are encountered with any regularity in mainland China and Hainan Island: Cynopterus sphinx, Eonycteris spelaea, Macroglossus sobrinus, Rousettus leschenaultii, and Sphaerias blanfordi. Three species in the genus Pteropus are referred to in old records, but these bats are clearly not native to mainland China.
13

New locality of vulnerable bivalve species Pisidium obtusale (Lamarck, 1819) (Sphaeriidae) with notes on its ecology and conservation status in Wielkopolska region (western Poland)

67%
Czyz M., Nizio J.
Badania Fizjograficzne. Seria C - Zoologia
|
2010
|
tom 01(C51)
14

Evaluation of conservation status of roadside verges and their vegetation in North England

67%
Akbar K. F., Hale W. H. G., Headley A. D., Ashraf I.
Polish Journal of Ecology
|
2010
|
tom 58
|
nr 3
The roadside verges and their vegetation in selected counties of north England were evaluated for their conservation status. Thirty five different road sections each 50 m long along different A and B class roads were surveyed and the criteria selected for conservation evaluation included verge area, plant diversity, species richness, disturbance, presence of rare species and structure of hedges. A field assessment sheet was prepared in which, for each factor, a numerical rating system was used. For each factor, information was recorded to help the surveyor in choosing the appropriate score for that site. The rarity of recorded species was determined from the published sources. Most of the surveyed verges (54%) are of low conservation value, 40% are of medium conservation value and only 6% have high conservation status. Despite the unsatisfactory situation, there is considerable potential for using roadside verges for nature conservation because medium class verges could be improved by adopting sound management techniques.
15
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Chorological and conservation status of the endemic cypress, Cupressus atlantica Gaussen, in the High Atlas (Morocco)

67%
Sekiewicz K., Sekiewicz M., Romo A., Didukh Y., Fennane M., Boratynski A.
Dendrobiology
|
2014
|
tom 71
We present a study of the distribution, ecology and conservation status of Cupressus atlantica, an endemic tree of the High Atlas (Morocco). The main populations of this species grow in a reduced area along the N’Fiss valley in the Central High Atlas and are gradually receding. Particular populations are increasingly fragmented and the total area covered by the cypress woodland has decreased to less than a third of the surface occupied in the 1930s. Overgrazing reduces the woodlands’ regenerative capacity, and the exploitation of the wood, linked to traditional uses by the rural society of the N’Fiss valley, directly reduces the number of trees. Great efforts being made to protect the species by the Haut Commissariat aux Eaux et Forêts are having some effect in recent years.
16
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Distribution, ecology and conservation status of Dionysia involucrata Zaprjag., an endangered endemic of Hissar Mts (Tajikistan, Middle Asia)

67%
Nowak A. S., Nobis M., Nowak S., Nobis A.
Acta Societatis Botanicorum Poloniae
|
2014
|
tom 83
|
nr 2
Dionysia involucrata Zaprjag. (Primulaceae) is known as critically endangered endemic species of Hissar Mountains in Tajikistan. It is reported from few localities mainly in Varzob River valley and its tributaries. The species inhabits steep or overhanging faces of granite rocks in narrow river gorges. During the research all known populations of D. involucrata were examined in respect of the habitat conditions and species composition of vegetation plots. We analyzed the population extent of the species in its range in Tajikistan and the main threats in order to assess its conservation status. The detrended correspondence analysis was performed on a matrix of 65 relevés and 49 species (vascular plants and mosses), to classify the phytocoenosis with domination of D. involucrata according to their floristic composition in relation to other petrophytic vegetation units. Using our field data regarding present extent of occurrence and area of occupancy we conclude that the threat category of D. involucrata should be reassessed from critically endangered to endangered. The species shows decline tendency in extent of occurrence, area of occupancy as well as in number of locations. The vegetation plots with domination of D. involucrata have relatively high level of separateness due to different species composition. We define the new association – Dionysietum involucratae – representing chasmophytic vegetation of submontane and montane zone in Middle Asia (ca. 1000–1600 m a.s.l.). The plots of Dionysietum involucratae were found mainly on granite rocks, on very steep or overhanging faces, on southwestern or southern exposition. The association is rather poor in species with inconsiderable contribution of mosses. Despite the diagnostic species, Campanula incanescens, Carex koshewnikowii and Scutellaria hissarica were the most abundant and frequent taxa within the researched patches of vegetation.
17

Stan zachowania parku dworskiego w Piotrowicach (województwo lubelskie)

59%
Pudelska K., Kucia K.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
2008
|
tom 525
Od wieku XVIII majątek Koźmianów w Piotrowicach, obejmujący dwór z otaczającym go parkiem (12,21 ha) oraz sadem, ogrodem warzywnym i częścią folwarczną, zajmował powierzchnię 22,54 ha. Obecnie założenie dworsko-parkowe, którego właścicielami są: Państwowy Ośrodek Maszynowy i Szkoła Rolnicza, zajmuje 9,21 ha. Zmiany własnościowe obiektu, jakie pojawiły się w ciągu ostatnich sześćdziesięciu lat, a za nimi zmiany funkcji, stały się przyczyną poważnych przekształceń kompozycyjnych na terenie parku. Pojawienie się kilku obiektów sportowych, duże powierzchnie samosiewów w dawnych wnętrzach parkowych utrudniają czytelność kompozycji obecnego parku. Obecnie na terenie parku rośnie ponad dwa tysiące drzew (19 taksonów), w tym 76 starodrzewu, który liczy powyżej 120 lat. Aż 52 drzewa spełnia wymagania stawiane przy typowaniu na pomniki przyrody, są to: Quercus robur L., Larix decidua MILL., Tilia cordata MILL., Fraxinus excelsior L. Większość drzew jest w dobrym stanie, wymagają jedynie systematycznych prac pielęgnacyjnych. Park piotrowicki ma duże znaczenie historyczne i jest cennym przyrodniczo obiektem na terenie Lubelszczyzny. Od grudnia 1993 roku jest wpisany do rejestru zabytków.
18

The genus Hypoxis L. (Hypoxidaceae) in the East Tropical Africa: variability, distribution and conservation status

59%
Wiland-Szymanska J.
Biodiversity: Research and Conservation
|
2009
|
tom 14
19

Tentative list of endemic vascular plants of the Zeravshan Mts in Tajikistan: distribution, habitat preferences and conservation status of species

51%
Nowak A., Nobis M.
Biodiversity: Research and Conservation
|
2010
|
tom 19
20

Rozmieszczenie i stan zachowania siedlisk przyrodniczych projektowanego obszaru Natura 2000 "Ostoja nad Bobrem"

34%
Reczynska K.
Acta Botanica Silesiaca
|
2008
|
tom 03
The paper summarizes fieldwork which was carried out on the proposed Natura 2000 area called Ostoja nad Bobrem, located in the south-west of Poland. The research confirmed the presence of natural habitats appearing in Annex I to the Habitat Directive. Among them there are particularly important priority habitats such as: species-rich Nardus grasslands on siliceous substrates in mountain areas (and submountain areas in Continental Europe *6230), Tilio-Acerion forests on slopes screes and ravines (*9180) and alluvial forests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alnion incanae, Salicion albae *91E0).
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.