scholarly journals The dynamics of Listera ovata populations on mineral islands in the Biebrza National Park

2014 ◽  
Vol 71 (3) ◽  
pp. 243-251 ◽  
Author(s):  
Emilia Brzosko
Keyword(s):  
Population Dynamics ◽  
National Park ◽  
Vegetative Reproduction ◽  
Leaf Size ◽  
The Other ◽  
Costs Of Reproduction ◽  
Isolated Populations ◽  
Other Hand ◽  
Population Sizes

Observations of two isolated populations of <em>Listera ovata</em> (Oparzelisko and Zabudnik) were conducted for 7 years in the Biebrza National Park. The studied populations differed in size, proportion of flowering individuals and effectiveness of reproduction. High number of juvenile individuals in OPA population was noted under conditions more favourable for germination (gaps in vegetation and higher moisture of soil). On the other hand, vegetative reproduction is important in the dynamics of ZAB population. The natural fruiting rate of <em>L. ovata</em> is relatively high (up to 90%) and does not seem to be pollinator limited. Some costs of reproduction especially in terms of leaf size were observed. The dormancy is important in the population dynamics. In some years even one third of the population may be dormant. <em>L. ovata</em> produces enough seeds and offspring to maintain or even increase population sizes. These facts, connected with the longevity of individuals,indicate that populations of <em>L. ovata</em> in the Biebrza National Park are not threatened with extinction in the nearest future.

scholarly journals THE AGRO-PASTORAL CONFLICTS AND FORAGE SPECIES PRIZED BY CATTLE: CASE OF THE NORTHERN PERIPHERY OF THE MBAM AND DJEREM NATIONAL PARK (ADAMAOUA-CAMEROON)

2021 ◽  
Vol 9 (02) ◽  
pp. 965-985
Author(s):  
Marie Mvu Njoya ◽  
◽  
Ambahe Duplex Rufin ◽  
Keyword(s):  
High Frequency ◽  
National Park ◽  
Low Frequency ◽  
Partial Solution ◽  
The Other ◽  
Survey Method ◽  
Other Hand ◽  
Forage Species ◽  
The One ◽  
The Relationship

In the outskirts of the northern periphery of Mbam and Djerem National Park, agro-pastoral conflicts have become very frequent in recent years. The resulting damage is so surprising that it leaves no one indifferent. Unfortunately, many writings analyze the causes of these agro-pastoral conflicts without, however, dwelling on the fodder resources which constitute not only the staple food of cattle but also one of the primary factors of these antagonisms. To overcome this knowledge gap, the authors adopted the survey method in order to identify, on the one hand, the attributes of agro-pastoral conflicts and the plant species consumed in all seasons by cattle on the northern periphery of the PNMD and, on the other hand, the relationship between these forage species with the frequency of agro-pastoral conflicts according to the protagonists and the seasons. Thus, from field observations and a questionnaire sent to 44 breeders and 103 farmers in four control villages, it results, after processing the data, that the high frequency of conflicts experienced by the farmers in the dry season (35.9 %) and especially by the breeders (70.5%) is due to the location of the forage species prized in this season at the bottom of the valleys where the herds are concentrated and compete. On the other hand, the low frequency of conflicts experienced during the rainy season especially by breeders, except in Mbitom, is more justified by the extension of fodder registers to woody leaves from the start of this season. Finally, the fodder fields of Brachiaria constitute a partial solution to the shortage of pastures even if it sometimes gives rise to new conflicts between herders.

Diversity and abundance of Lepidoptera populations in the Theniet El Had National Park (Algeria)

Zootaxa ◽  
2020 ◽  
Vol 4743 (1) ◽  
pp. 35-46
Author(s):  
KACHA SAMIRA ◽  
DJERBAOUI MALIKA ◽  
MARNICHE FAIZA ◽  
DE PRINS WILLY ◽  
RAMDANI MOHAMMED ◽  
...  
Keyword(s):  
National Park ◽  
Diversity Indices ◽  
The Other ◽  
Base Line ◽  
Lepidopteran Species ◽  
Other Hand ◽  
Number Of Individuals ◽  
First Time ◽  
Total Species

An inventory of Lepidoptera in the Theniet El Had National Park (PNTEH), Algeria, revealed 86 taxa, both butterflies and moths. The specimens were collected in 68 localities distributed over ten cantons within the park in the period 2015–2017. A preliminary faunistic list is compiled as a base-line contribution to the study of adult Lepidoptera in this park. In total, 3139 specimens were collected. The moths are clearly well diversified, with 14 families and 49 species obtained from a total of 1485 adult specimens. The butterflies are represented by 5 families with 37 species and 1654 specimens. A total of 8 families are reported for the first time from this park, in order of abundance: Zygaenidae, Hesperiidae, Crambidae, Alucitidae, Heterogynidae, Sesiidae, Oecophoridae, and Cossidae. Also 61 species are recorded here for the first time for the park. The most diverse family is Nymphalidae with 15 taxa (23% of the total species). On the other hand, the Erebidae are represented by 894 specimens (28.5% of the total number of specimens. Within the Erebidae, the genus Catocala contains the highest number of individuals (794 specimens). The canton of Pré-Ben Chouhra is quantitatively the best represented with 625 specimens (19.9% of the total number of specimens collected) and the Nursery canton as the richest in lepidopteran species with 72 species observed. The diversity indices (H’ and Hmax.) and the equitability index (E), calculated for the 10 cantons indicate that lepidopteran species are diverse in each station. 

Lung nematodes of chamois, Rupicapra rupicapra tatrica, from the Tatra National Park, Slovakia

1999 ◽  
Vol 73 (3) ◽  
pp. 259-263 ◽  
Author(s):  
A. Štefanèíková ◽  
B. Chovancová ◽  
P. Dubinský ◽  
O. Tomašovièová ◽  
J. Èorba ◽  
...  
Keyword(s):  
National Park ◽  
The Other ◽  
Individual Species ◽  
Equal Proportion ◽  
Rupicapra Rupicapra ◽  
Other Hand ◽  
The Mean ◽  
Tatra National Park ◽  
The High Tatras

A larvoscopic examination of faeces collected from localities inhabited by chamois in the Tatra National Park (TANAP) in 1997 demonstrated the presence of the lung nematodes Muellerius spp. (likely to be M. tenuispiculatus and M. capillaris) and Neostrongylus linearis. The overall prevalence of lung nematodes in chamois herds in TANAP was 48.4% with prevalences of 45.6% and 11.9% for Muellerius spp. and N. linearis, respectively. No significant differences in lung nematode prevalences were observed in the biotopes of TANAP with prevalence values of 44.9% being recorded in the High Tatras and 58.5% in the Belianske Tatras. Individual species were in equal proportion in both biotopes, although N. linearis was significantly less prevalent (11.2–13.8%). The prevalence of lung nematodes in the High Tatras varied from 25.0 to 84.2% within individual localities, while in the Belianske Tatras it was more proportionate (50.0–85.7%). In the High Tatras, the prevalence of lung nematodes in the chamois herds peaked during August, declining to its lowest in October. A similar prevalence was also recorded for Muellerius species, while the minimum prevalence of N. linearis was found in July. In the Belianske Tatras, the prevalence of lung nematodes including both species of Muellerius peaked in July and gradually decreased until October. On the other hand, N. linearis was most prevalent in October. The mean L1 count per gram faeces was low (7.6 ± 13.2 larvae g-1).

RAPID ASSESSMENT ON MACRO-MOTH DIVERSITY AT GUNUNG TAMBORA NATIONAL PARK, WEST NUSA TENGGARA

Zoo Indonesia ◽  
2020 ◽  
Vol 27 (1) ◽  
Author(s):  
Hari Sutrisno
Keyword(s):  
National Park ◽  
Diversity Index ◽  
Rapid Assessment ◽  
The Other ◽  
Jaccard Coefficient ◽  
Other Hand ◽  
Base Camp

Rapid assessment on moth fauna with focus on macro-moths was conducted at Gunung Tambora National Park from 16 to 26 April 2015. The aims of the study were to acquire information on macro-moth diversity and to access the composition of the species at this area. The result showed that a short collecting time within two sampling sites recorded only about 77.8% of estimated value in this park (242 of 311 species). Index diversity based on Fisher’s α is low (97.21). In addition, the number of families recorded from this park is also low, only 17 families, or about one third of the moth families that occur in Indo-Malayan region. Camp II site was higher than the base camp Oi Marai sites in term of the diversity index. These two sites have a few species in common as indicated by Jaccard coefficient that was low (13.8%). In general, Noctuidae (26%), Pyralidae (20%), and Geometridae (19%) dominate across all sites. Noctuidae, Geometridae, Lymantriidae were higher in Camp II than those found in Oi Marai. On the other hand,Pyralidae was higher in Oi Marai than those found in Base Camp II.Keywords: Fisher’s α, index diversity, similarity.

scholarly journals Population dynamics and performance of exotic versus indigenous chicken population in the selected districts of North Western Amhara, Ethiopia

2017 ◽  
Vol 1 (2) ◽  
pp. 90-99
Author(s):  
TILAHUN SISAY ◽  
KEFEYALEW ALEMAYEHU ◽  
ZEWDU WULETAW
Keyword(s):  
Population Dynamics ◽  
Population Size ◽  
Production System ◽  
Egg Production ◽  
The Other ◽  
Indigenous Chicken ◽  
Other Hand ◽  
Chicken Population ◽  
And Performance ◽  
North Western

Sisay T, Alemayehu K, Wuletaw Z. 2017. Population dynamics and performance of exotic versus indigenous chicken population in the selected districts of North Western Amhara, Ethiopia. Trop Drylands 1: 90-99. Chicken in Ethiopia contributes, respectively, 98.5% and 99.2% of the national egg and chicken meat production. The total chicken population is estimated to be 56.87 million of which 95.86, 2.79 and 1.35% are indigenous, crossbred and exotic breeds, respectively. The objective of this paper was to quantify the population dynamics and performance of exotic versus indigenous chicken population in the selected districts of northwestern Amhara, Ethiopia. Banja and Burie districts and six Kebeles (three/district) were purposively selected. A total 180 respondents were selected by systematic and simple random sampling techniques for the survey. On the other hand, a total of 90 exotic chicken owners were purposively selected for monitoring and evaluation. GLM procedure of SAS (2002) was used to quantify the fixed effects of agroecology and breeds on the egg production performance. The results revealed that the majorities (91.12%) of distributed exotic chickens were kept in traditional/backyard production system. The overall mean egg production for exotic chickens (141.58±11.5) was too low. Significantly, the mean number of clutch per year per hen of Bovans Brown chicken was higher (4.51±0.11 days) than Bovans white breeds (3.5±0.10 days). Shortage at first egg was attained from midland of Koekoek chicken breed (5.38±0.24 months) than from highland (6.54±0.10 months) in Bovans Brown chicken. A highly significant difference in mortality was observed between Bovans Brown (89%) and Koekoek breed (32.4%), respectively due to traditional farmers' management practice. Distribution of different exotic chicken genotypes in the region is increasing from time to time for the upgrading of local chicken ecotypes but, the survival, productivity and population size of exotic and their crosses were too low. On the other hand, the population size of the indigenous chicken and its productivity remains almost constant. Causes of chick mortality in the study area were disease and predator which need to be considered in the development plan of the districts. This is due to the inappropriate production system, genotype, and management. Therefore, production and productivity will be increased through the selection of indigenous chicken ecotypes and crossbreed or upgrading by introduction exotic cocks, pullets and or fertile eggs of high egg producing strains with an appropriate production system and management in respective production system.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Life Beyond 1MeV

1980 ◽  
Vol 38 ◽  
pp. 30-33
Author(s):  
K.H. Westmacott
Keyword(s):  
Electron Microscopy ◽  
Past Experience ◽  
The Other ◽  
Good Case ◽  
Other Hand ◽  
The U.S

Life beyond 1MeV – like life after 40 – is not too different unless one takes advantage of past experience and is receptive to new opportunities. At first glance, the returns on performing electron microscopy at voltages greater than 1MeV diminish rather rapidly as the curves which describe the well-known advantages of HVEM often tend towards saturation. However, in a country with a significant HVEM capability, a good case can be made for investing in instruments with a range of maximum accelerating voltages. In this regard, the 1.5MeV KRATOS HVEM being installed in Berkeley will complement the other 650KeV, 1MeV, and 1.2MeV instruments currently operating in the U.S. One other consideration suggests that 1.5MeV is an optimum voltage machine – Its additional advantages may be purchased for not much more than a 1MeV instrument. On the other hand, the 3MeV HVEM's which seem to be operated at 2MeV maximum, are much more expensive.

Can the Academic Self-Concept be Positive and Realistic?

2005 ◽  
Vol 19 (3) ◽  
pp. 129-132 ◽  
Author(s):  
Reimer Kornmann
Keyword(s):  
Academic Performance ◽  
Opposite Effect ◽  
Self Esteem ◽  
Point Of View ◽  
The Other ◽  
Self Concept ◽  
High Ability ◽  
Self Image ◽  
Other Hand

Summary: My comment is basically restricted to the situation in which less-able students find themselves and refers only to literature in German. From this point of view I am basically able to confirm Marsh's results. It must, however, be said that with less-able pupils the opposite effect can be found: Levels of self-esteem in these pupils are raised, at least temporarily, by separate instruction, academic performance however drops; combined instruction, on the other hand, leads to improved academic performance, while levels of self-esteem drop. Apparently, the positive self-image of less-able pupils who receive separate instruction does not bring about the potential enhancement of academic performance one might expect from high-ability pupils receiving separate instruction. To resolve the dilemma, it is proposed that individual progress in learning be accentuated, and that comparisons with others be dispensed with. This fosters a self-image that can in equal measure be realistic and optimistic.

Stories and the Self

2020 ◽  
Vol 32 (2) ◽  
pp. 47-58 ◽  
Author(s):  
Stefan Krause ◽  
Markus Appel
Keyword(s):  
Meta Analysis ◽  
The Self ◽  
The Other ◽  
Lower Degree ◽  
Contrast Effects ◽  
Self Perception ◽  
Self Perceptions ◽  
Other Hand ◽  
The One ◽  
Implicit And Explicit

Abstract. Two experiments examined the influence of stories on recipients’ self-perceptions. Extending prior theory and research, our focus was on assimilation effects (i.e., changes in self-perception in line with a protagonist’s traits) as well as on contrast effects (i.e., changes in self-perception in contrast to a protagonist’s traits). In Experiment 1 ( N = 113), implicit and explicit conscientiousness were assessed after participants read a story about either a diligent or a negligent student. Moderation analyses showed that highly transported participants and participants with lower counterarguing scores assimilate the depicted traits of a story protagonist, as indicated by explicit, self-reported conscientiousness ratings. Participants, who were more critical toward a story (i.e., higher counterarguing) and with a lower degree of transportation, showed contrast effects. In Experiment 2 ( N = 103), we manipulated transportation and counterarguing, but we could not identify an effect on participants’ self-ascribed level of conscientiousness. A mini meta-analysis across both experiments revealed significant positive overall associations between transportation and counterarguing on the one hand and story-consistent self-reported conscientiousness on the other hand.

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