scholarly journals The role of peat on permafrost thaw based on field observations

CATENA ◽  
2022 ◽  
Vol 208 ◽  
pp. 105772
Author(s):  
Ran Du ◽  
Xiaoqing Peng ◽  
Oliver W. Frauenfeld ◽  
Wen Sun ◽  
Benben Liang ◽  
...  
Keyword(s):  
Field Observations ◽  
Permafrost Thaw

Saturated Hydraulic Conductivity of Clayey Tills and the Role of Fractures

1990 ◽  
Vol 21 (2) ◽  
pp. 119-132 ◽  
Author(s):  
Johnny Fredericia
Keyword(s):  
Hydraulic Conductivity ◽  
American Studies ◽  
Field Measurements ◽  
Present Knowledge ◽  
Saturated Hydraulic Conductivity ◽  
Field Observations ◽  
Laboratory Measurements ◽  
Vertical Hydraulic Conductivity ◽  
Data Field

The background for the present knowledge about hydraulic conductivity of clayey till in Denmark is summarized. The data show a difference of 1-2 orders of magnitude in the vertical hydraulic conductivity between values from laboratory measurements and field measurements. This difference is discussed and based on new data, field observations and comparison with North American studies, it is concluded to be primarily due to fractures in the till.

scholarly journals Mass bleaching of soft coral, Sarcophyton spp. in Thailand and the role of temperature and salinity stress

2009 ◽  
Vol 66 (7) ◽  
pp. 1515-1519 ◽  
Author(s):  
Suchana Chavanich ◽  
Voranop Viyakarn ◽  
Thepsuda Loyjiw ◽  
Priyapat Pattaratamrong ◽  
Anchalee Chankong
Keyword(s):  
Salinity Stress ◽  
Soft Coral ◽  
Elevated Temperatures ◽  
Gulf Of Thailand ◽  
Field Observations ◽  
Experimental Trial ◽  
First Time ◽  
Upper Gulf Of Thailand ◽  
Mass Bleaching

Abstract Chavanich, S., Viyakarn, V., Loyjiw, T., Pattaratamrong, P., and Chankong, A. 2009. Mass bleaching of soft coral, Sarcophyton spp. in Thailand and the role of temperature and salinity stress. – ICES Journal of Marine Science, 66: 1515–1519. From June to October 2006 and 2007, mass bleaching of the soft coral, Sarcophyton spp., occurred for the first time in the upper Gulf of Thailand. Approximately 90% of the populations experienced extensive bleaching, and almost 95% of colonies were affected. Field observations also revealed that fragmentation of Sarcophyton spp. set in 1 month after the onset of bleaching. Some colonies started to recover to some extent by the end of July, with 95% of the population of Sarcophyton spp. recovering by October. Both acute and chronic trials were conducted to determine whether temperature and/or salinity triggered bleaching. In the acute tests, Sarcophyton spp. at 40°C and salinity 20 psu were completely bleached, and death occurred after 57 and 204 h, respectively. However, the colonies at 40 psu could survive through the experimental trial. In the chronic tests, Sarcophyton spp. died when exposed to 34°C, whereas complete bleaching and mortality of Sarcophyton spp. occurred at salinities of 10 and 49 psu. We conclude that elevated temperatures had a greater effect on the bleaching of Sarcophyton spp. than did salinity.

scholarly journals A sink host allows a specialist herbivore to persist in a seasonal source

2021 ◽  
Vol 288 (1958) ◽  
pp. 20211604
Author(s):  
Alicja Laska ◽  
Sara Magalhães ◽  
Mariusz Lewandowski ◽  
Ewa Puchalska ◽  
Kamila Karpicka-Ignatowska ◽  
...  
Keyword(s):  
Experimental Evolution ◽  
Laboratory Experiments ◽  
Field Observations ◽  
Stepping Stones ◽  
Specialist Herbivore ◽  
Negative Growth Rate ◽  
Evolutionary Rescue ◽  
Main Host ◽  
Negative Growth

In seasonal environments, sinks that are more persistent than sources may serve as temporal stepping stones for specialists. However, this possibility has to our knowledge, not been demonstrated to date, as such environments are thought to select for generalists, and the role of sinks, both in the field and in the laboratory, is difficult to document. Here, we used laboratory experiments to show that herbivorous arthropods associated with seasonally absent main (source) habitats can endure on a suboptimal (sink) host for several generations, albeit with a negative growth rate. Additionally, they dispersed towards this host less often than towards the main host and accepted it less often than the main host. Finally, repeated experimental evolution attempts revealed no adaptation to the suboptimal host. Nevertheless, field observations showed that arthropods are found in suboptimal habitats when the main habitat is unavailable. Together, these results show that evolutionary rescue in the suboptimal habitat is not possible. Instead, the sink habitat functions as a temporal stepping stone, allowing for the persistence of a specialist when the source habitat is gone.

scholarly journals Efektivitas Implementasi Program Perumahan Bersubsidi Bagi Masyarakat Berpenghasilan Rendah Kota Pekanbaru (Studi Kasus : Kecamatan Tenayan Raya)

2020 ◽  
Vol 20 (02) ◽  
pp. 101-109
Author(s):  
Firdaus Agus ◽  
Septia Fanny ◽  
Rona Muliana
Keyword(s):  
Literature Review ◽  
Development Policy ◽  
Likert Scale ◽  
Qualitative Approach ◽  
Housing Development ◽  
Field Observations ◽  
Role Of Government ◽  
Program Goal ◽  
Document Review

[ID] Untuk mengetahui tercapai atau tidaknya suatu tujuan  program perlu dilakukan evaluasi terhadap implementasi program tersebut, baik pelaksanaan program maupun hasilnya. Evaluasi diperlukan untuk mengukur tingkat efektivitas mekanisme program dari pembiyaan dan apakah efektivitas bila dilihat dari hasil pembangunannya, disamping itu akan diketahui sejauhmana peran pemerintah melalui Kepnmen PUPR No.348/KPTS/M/2015, sebab untuk beberapa tahun kedepan kebijakan pembangunan perumahan MBR ini masih relavan dilaksanakan. Penelitian ini bertujuan untuk mengetahui tingkat efektivitas program. Pendekatan yang digunakan dalam peneltian ini adalah pendekatan deskriptif kualitatif yang didukung oleh data  dari hasil kuesioner, wawancara, dan observasi lapangan, serta data dari kajian dokumen dan telaah pustaka. Perhitungan efektivitas dilakukan dengan melakukan pembobotan menggunakan skala Likert yang didasarkan pada kriteria efektivitas. Hasil penelitian menunjukkan secara umum efektifitas Implementasi Program Perumahan Bersubsidi bagi MBR mendapat nilai 80% yang berarti Efektif. [EN] To find out whether or not a program goal has been achieved, it is necessary to evaluate the implementation of the program, both the program's implementation and its results. Evaluation is needed to measure the effectiveness of the program mechanism of financing and whether the effectiveness when viewed from the results of its development, besides that it will be known to what extent the role of government through the Ministry of PUPR No. 348 / KPTS / M / 2015, because for the next few years the MBR housing development policy is still relavan implemented. This study aims to determine the level of effectiveness of the program. The approach used in this research is a quantitative and qualitative approach which is supported by data from the results of questionnaires, interviews and field observations, as well as data from document review and literature review. The effectiveness calculation is done by measuring the Likert scale based on the effectiveness criteria. The results shows that  Effectiveness of Subsidied Housing Programs Implementation at a rate of 80% which mean generally Effective.  

scholarly journals TINGGALAN TRADISI MEGALITIK Dl KAMPUNG KOKAS, KOMBIF, SUN WABAN KABUPATEN MAYBRAT (Megalithic Tradition in Village of Kokas, Kombi Sun-Waban, Maybrat Regency)

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Klementin Fairyo
Keyword(s):  
Coastal Areas ◽  
Field Observations ◽  
Literature Study ◽  
Data Description ◽  
Archaeological Data ◽  
Processing Data

The remains of the megalithic tradition in Papua since prehistoric times. Megalithic relics are not only found in coastal areas, but also found in the interior. This paper aims to describe and analyze the relic, the function and role of the remains of the megalithic tradition for the community supporters. The method used is a literature study, observation, and interviews. The results of field observations are megalithic structures and totor. Processing data includes identification and archaeological data description and ethnoarchaeology. AbstrakTinggalan tradisi megaiitik di Papua sejak masa prasejarah. Peninggalan megailitik tidak hanya ditemukan di daerah pesisir saja, tatapi juga ditemukan di pedalaman. Tulisan ini bertujuan mendeskripsikan dan mengkaji bentuk peninggalan, fungsi dan peran tinggalan tradisi megailitik tersebut bagi masyarakat pendukungnya. Metode peneiitian yang digunakan adalah stud I kepustakaan, observasi lapangan, dan wawancara. Hasil observasi lapangan adalah struktur bangunan megaiitik dan totor. Pengolahan data meliputi pengindentifikasian dan pendeskripsian data arkeologi dan etnoarkeoiogi. 

scholarly journals Analisis Keberlanjutan Dimensi Sosial Budaya Usahatani Padi Sawah di Kabupaten Siak Provinsi Riau

2019 ◽  
Vol 6 (2) ◽  
pp. 85
Author(s):  
Rachmiwati Yusuf ◽  
Usman Pato ◽  
Usman M Tang ◽  
Rahman Karnila Karnila
Keyword(s):  
Data Collection ◽  
Cultural Dimensions ◽  
Field Observations ◽  
Rice Farming ◽  
Dimensional Scaling ◽  
Cultural Conditions ◽  
The Status ◽  
Interviewing Techniques ◽  
Multi Dimensional Scaling

The study was conducted from January to July 2018 in four sub-districts (Bunga Raya, Sabak Auh, Sungai Apit and Sungai Mandau) in Siak Regency. The sample of farmers in this study were 203 people who were selected by purposive sampling. Data collection was done by interviewing techniques using questionnaires and field observations. The analysis of the sustainability of lowland rice farming was carried out based on the assessment of index and sustainability status using the Rap-Rice method in Multi-Dimensional Scaling (MDS). The purpose of this study was to analyze the index and the status of sustainability of the socio-cultural dimensions of wetland farming and analyze the role of each of the socio-cultural attributes that have sensitivity to the management of rice farming in the future. The results of Rap-Rice analysis of the seven socio-cultural attributes analyzed, two attributes provide sensitivity to the District (Bunga Raya, Sabak Auh and Sungai Mandau). Four attributes give sensitivity to Sungai Apit District. The attribute that gives sensitivity to all sub-districts is the attribute of attending training / counseling. Based on socio-cultural conditions, the analysis of wetland rice farming in Siak District showed a fairly sustainable category for Bunga Raya District (56.7%), Sabak Auh (50.80%) and Sungai Mandau (51.10%) while for Sungai Apit Subdistrict the value was obtained (47.70%) or less sustainable .

Contractional salt tectonics and role of pre-existing diapiric structures in the Southern Pyrenean foreland fold–thrust belt (Montsec and Serres Marginals)

2021 ◽  
pp. jgs2020-085 ◽  
Author(s):  
Laura Burrel ◽  
Antonio Teixell
Keyword(s):  
Cross Sections ◽  
Foreland Basin ◽  
Salt Tectonics ◽  
Structural Development ◽  
Field Observations ◽  
Content Type ◽  
Growth Strata ◽  
Structural Style ◽  
Supplementary Material

Triassic Keuper evaporites have long been recognized as the main detachment level for thrusting in the Pyrenean fold–thrust belts. The deformed Late Cretaceous–Eocene foreland basin of the Southern Pyrenees has structures and stratal geometries that can be interpreted as related to salt tectonics (e.g. unconformities, rapid thickness variations, long-lived growth fans and overturned flaps), although they have been overprinted by shortening and thrusting. Based on field observations and published maps, we build new structural cross-sections reinterpreting two classic transects of the Southern Pyrenees (Noguera Ribagorçana and Noguera Pallaresa river transects). The sequential restoration of the sections explores the variations in structural style, addressing the role of halokinesis in the tectonic and sedimentary development. In the Serres Marginals area, we propose that salt pillows and diapirs started developing locally during the Mesozoic pre-orogenic episode, evolving into a system of salt ridges and intervening synclines filled with early synorogenic sediments. Rapid amplification of folds recorded by widespread latest Cretaceous–Paleocene growth strata is taken as marking the onset of contractional folding in the area. During Pyrenean compression, folding mechanisms transitioned from dominantly halokinetic to a combination of buckling and differential sedimentary loading. Squeezing of salt diapirs and thrust welding occurred as salt ridges were unroofed. We provide new field observations that lead to a reinterpretation of the regional structural development and contribute to the debate about the role of salt tectonics in the Pyrenees.Supplementary material: Table S1, giving the thickness of the main stratigraphic units, is available at https://doi.org/10.6084/m9.figshare.c.5287737

Early oligochaete science, from Aristotle to Francesco Redi

2011 ◽  
Vol 38 (1) ◽  
pp. 136-163 ◽  
Author(s):  
Emilia Rota
Keyword(s):  
Eighteenth Century ◽  
Seventeenth Century ◽  
Laboratory Tests ◽  
Habitat Requirements ◽  
Field Observations ◽  
Internal Anatomy ◽  
Internal Organs ◽  
Late Renaissance ◽  
Parasitic Worms

The paper reviews knowledge on earthworms from early classical times to the end of the seventeenth century. The Aristotelian view that these “imperfect” animals developed spontaneously from mud and lacked internal organs except the gut was not challenged until the late Renaissance but, by the end of the 1600s, it was overthrown. Aldrovandi and Mouffet presented field observations of sexual reproduction and specific habitat requirements. Willis demonstrated the complex internal anatomy of an earthworm. Finally Redi, based on numberless dissections, showed the existence of variations on that basic anatomical plan, which anyway remained distinct from that of parasitic worms. Through a series of controlled laboratory tests, Redi also proved that earthworms have a physiology of their own and are most sensible to water loss. In those same years, Swammerdam investigated earthworm cocoons nursing them in his room, and Tyson discovered earthworms’ hermaphroditism. Two significant interpretations of earthworm's locomotion, by Fabrici ab Aquapendente and Borelli, also belong to this period, but were both short-lived in their influence. An awareness of the ecological role of earthworms in pedogenesis and soil fertility did not emerge until the late eighteenth century.

scholarly journals Immunolocalization of deformed wing virus particles within the mite Varroa destructor

2008 ◽  
Vol 89 (7) ◽  
pp. 1685-1689 ◽  
Author(s):  
Ma. Teresa Santillán-Galicia ◽  
Raffaella Carzaniga ◽  
Brenda V. Ball ◽  
Peter G. Alderson
Keyword(s):  
Varroa Destructor ◽  
Laboratory Experiments ◽  
Field Observations ◽  
Pupal Development ◽  
Deformed Wing Virus ◽  
Faecal Pellets ◽  
Virus Particles ◽  
Midgut Lumen ◽  
Wing Deformation

Deformed wing virus (DWV) induces wing deformation when bees are infected during their pupal development. Field observations and laboratory experiments suggest that the mite Varroa destructor is a vector of the virus. Moreover, it has been stated that DWV replicates within this mite. In order to understand the role of V. destructor in the transmission of DWV, the objective of this work was to locate the sites of retention and/or replication of DWV within the mite by immunohistochemistry. There was no evidence that DWV was replicating in the mite as no tissues showed specific antibody binding to DWV. Also, there were no specific structures that could be suggested as retention sites. DWV was found only in the midgut lumen of V. destructor in structures resembling large, dense spheres, which were presumably faecal pellets.

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