scholarly journals INVENTARISASI JENIS – JENIS ULAR YANG DITEMUKAN DI SEKITAR PANTAI MERTA SARI DAN PADANG GALAK

2017 ◽  
Vol 5 (2) ◽  
pp. 69
Author(s):  
I Gusti Putu Ayunda Pratiska ◽  
Ida Bagus Made Suaskara ◽  
Joko Wiryatno ◽  
I Gede Agus Pradana Putra
Keyword(s):  
Mangrove Forest ◽  
Coastal Areas ◽  
Research Needs ◽  
Snake Species ◽  
Venomous Snakes ◽  
Sea Snakes ◽  
Water Snake ◽  
Laticauda Colubrina

Sea snakes have a strong venom and when they bite can be fatal for humans, whereas snakes found in mangrove areas are weak venomous snakes and non-venomous snakes (McKay, 2006). The low understanding public aboutthe snakes has led to the assumption that any snakes found are dangerous, so research needs to be done in order to provide information on the types of venomous and non-venomous snakes present in coastal areas and around mangrove forest areas. This research was conducted from early January to the end of January located around Merta Sari Beach to Padang Galak. The method used is the method of cruising method is done by determining the habitat that is likely suitable for snake habitat (Asad et al., 2011). Data collected in the morning and at night, by capturing and identifying snakes found in situ refers to the snake identification titled '107+ Ular Indonesia' (Riza Marlon, 2014), and the book 'Reptiles and Amphibians in Bali 'By Mckay (2006). Based on the results of the study, snakes found around Merta Sari Beach and Padang Galak Beach numbered 61 individual snakes with two different families namely Colubridae and Elapidae. Snake species of the Colubridae family found are Dog-faced Water Snake (Cerberus rynchops) and the Elapidae family is the Erabu/Yellow-lipped Sea Krait (Laticauda colubrina) snake

scholarly journals Synergy between satellite observations and model simulations during extreme events

2018 ◽  
Author(s):  
Anne Wiese ◽  
Joanna Staneva ◽  
Johannes Schultz-Stellenfleth ◽  
Arno Behrens ◽  
Luciana Fenoglio-Marc ◽  
...  
Keyword(s):  
Satellite Data ◽  
Extreme Events ◽  
Wave Model ◽  
Coastal Areas ◽  
In Situ Measurements ◽  
Model Simulations ◽  
Significant Wave ◽  
Operational Analysis

Abstract. In this study, the quality of wind and wave data provided by the new Sentinel-3A satellite is evaluated. We focus on coastal areas, where altimeter data are of lower quality than those for the open ocean. The satellite data of Sentinel-3A, Jason-2 and CryoSat-2 are assessed in a comparison with in situ measurements and spectral wave model (WAM) simulations. The sensitivity of the wave model to wind forcing is evaluated using data with different temporal and spatial resolution, such as ERA-Interim and ERA5 reanalyses, ECMWF operational analysis and short-range forecasts, German Weather Service (DWD) forecasts and regional atmospheric model simulations -coastDat. Numerical simulations show that both the wave model forced using the ERA5 reanalyses and that forced using the ECMWF operational analysis/forecast demonstrate the best capability over the whole study period, as well as during extreme events. To further estimate the variance of the significant wave height of ensemble members for different wind forcings, especially during extreme events, an empirical orthogonal function (EOF) analysis is performed. Intercomparisons between remote sensing and in situ observations demonstrate that the overall quality of the former is good over the North Sea and Baltic Sea throughout the study period, although the significant wave heights estimated based on satellite data tend to be greater than the in situ measurements by 7 cm to 26 cm. The quality of all satellite data near the coastal area decreases; however, within 10 km off the coast, Sentinel-3A performs better than the other two satellites. Analyses in which data from satellite tracks are separated in terms of onshore and offshore flights have been carried out. No substantial differences are found when comparing the statistics for onshore and offshore flights. Moreover, no substantial differences are found between satellite tracks under various metocean conditions. Furthermore, the satellite data quality does not depend on the wind direction relative to the flight direction. Thus, the quality of the data obtained by the new Sentinel-3A satellite over coastal areas is improved compared to that of older satellites.

Climate Change Effects on Venomous Snakes

2019 ◽  
pp. 475-490
Author(s):  
Abdellah Bouazza ◽  
Moulay Abdelmonaim El Hidan ◽  
Abdelmohcine Aimrane ◽  
Kholoud Kahime ◽  
Aziza Lansari ◽  
...  
Keyword(s):  
Basic Knowledge ◽  
Human Populations ◽  
High Tendency ◽  
Snake Species ◽  
Clinical Scales ◽  
Climate Change Effects ◽  
Venomous Snakes ◽  
Key Factor ◽  
The Face ◽  
Snake Toxins

The purpose of this chapter is to examine the evidence of a relationship between climatic changes and snake species distribution in relation with the snakebites risk increment against human populations. The global climatic change is a key factor leading to snake species behavioral changes mainly because of the rise of temperature. The variety of venomous snakes and their related potency toward human being have been well documented. Thus, this may serve as a basic knowledge for any preventive act in the face of snake toxins and their caused physiopathological and clinical effects. In addition, several studies have shown that global warming have caused a change in snake habitat and distribution, thus leading to an increase of overlapped human and snake populations living territories which raise up the risk of envenomation. Globally, more than 20,000 deaths occur every year with a high tendency to increase. Thus, consideration of human risk of envenomation may be fundamental to the effective intervention in epidemiological and clinical scales.

scholarly journals A multi-collocation method for coastal zone observations with applications to Sentinel-3A altimeter wave height data

Ocean Science ◽  
2019 ◽  
Vol 15 (2) ◽  
pp. 249-268 ◽  
Author(s):  
Johannes Schulz-Stellenfleth ◽  
Joanna Staneva
Keyword(s):  
Collocation Method ◽  
Wave Height ◽  
Numerical Models ◽  
Coastal Areas ◽  
Data Sources ◽  
Data Sets ◽  
Model Data ◽  
Data Set ◽  
Stochastic Errors

Abstract. In many coastal areas there is an increasing number and variety of observation data available, which are often very heterogeneous in their temporal and spatial sampling characteristics. With the advent of new systems, like the radar altimeter on board the Sentinel-3A satellite, a lot of questions arise concerning the accuracy and added value of different instruments and numerical models. Quantification of errors is a key factor for applications, like data assimilation and forecast improvement. In the past, the triple collocation method to estimate systematic and stochastic errors of measurements and numerical models was successfully applied to different data sets. This method relies on the assumption that three independent data sets provide estimates of the same quantity. In coastal areas with strong gradients even small distances between measurements can lead to larger differences and this assumption can become critical. In this study the triple collocation method is extended in different ways with the specific problems of the coast in mind. In addition to nearest-neighbour approximations considered so far, the presented method allows for use of a large variety of interpolation approaches to take spatial variations in the observed area into account. Observation and numerical model errors can therefore be estimated, even if the distance between the different data sources is too large to assume that they measure the same quantity. If the number of observations is sufficient, the method can also be used to estimate error correlations between certain data source components. As a second novelty, an estimator for the uncertainty in the derived observation errors is derived as a function of the covariance matrices of the input data and the number of available samples. In the first step, the method is assessed using synthetic observations and Monte Carlo simulations. The technique is then applied to a data set of Sentinel-3A altimeter measurements, in situ wave observations, and numerical wave model data with a focus on the North Sea. Stochastic observation errors for the significant wave height, as well as bias and calibration errors, are derived for the model and the altimeter. The analysis indicates a slight overestimation of altimeter wave heights, which become more pronounced at higher sea states. The smallest stochastic errors are found for the in situ measurements. Different observation geometries of in situ data and altimeter tracks are furthermore analysed, considering 1-D and 2-D interpolation approaches. For example, the geometry of an altimeter track passing between two in situ wave instruments is considered with model data being available at the in situ locations. It is shown that for a sufficiently large sample, the errors of all data sources, as well as the error correlations of the model, can be estimated with the new method.

scholarly journals Integration of HF Radar Observations for an Enhanced Coastal Mean Dynamic Topography

2020 ◽  
Vol 7 ◽  
Author(s):  
Ainhoa Caballero ◽  
Sandrine Mulet ◽  
Nadia Ayoub ◽  
Ivan Manso-Narvarte ◽  
Xabier Davila ◽  
...  
Keyword(s):  
High Resolution ◽  
Sea Level ◽  
Satellite Data ◽  
Coastal Areas ◽  
Hf Radar ◽  
Global Ocean ◽  
Dynamic Topography ◽  
Mean Dynamic Topography ◽  
Radar Measurements

Satellite altimeters provide continuous information of the sea level variability and mesoscale processes for the global ocean. For estimating the sea level above the geoid and monitoring the full ocean dynamics from altimeters measurements, a key reference surface is needed: The Mean Dynamic Topography (MDT). However, in coastal areas, where, in situ measurements are sparse and the typical scales of the motion are generally smaller than in the deep ocean, the global MDT solutions are less accurate than in the open ocean, even if significant improvement has been done in the past years. An opportunity to fill in this gap has arisen with the growing availability of long time-series of high-resolution HF radar surface velocity measurements in some areas, such as the south-eastern Bay of Biscay. The prerequisite for the computation of a coastal MDT, using the newly available data of surface velocities, was to obtain a robust methodology to remove the ageostrophic signal from the HF radar measurements, in coherence with the scales resolved by the altimetry. To that end, we first filtered out the tidal and inertial motions, and then, we developed and tested a method that removed the Ekman component and the remaining divergent part of the flow. A regional high-resolution hindcast simulation was used to assess the method. Then, the processed HF radar geostrophic velocities were used in synergy with additional in situ data, altimetry, and gravimetry to compute a new coastal MDT, which shows significant improvement compared with the global MDT. This study showcases the benefit of combining satellite data with continuous, high-frequency, and synoptic in situ velocity data from coastal radar measurements; taking advantage of the different scales resolved by each of the measuring systems. The integrated analysis of in situ observations, satellite data, and numerical simulations has provided a further step in the understanding of the local ocean processes, and the new MDT a basis for more reliable monitoring of the study area. Recommendations for the replicability of the methodology in other coastal areas are also provided. Finally, the methods developed in this study and the more accurate regional MDT could benefit present and future high-resolution altimetric missions.

Interspecific relationships between two species of sympatric Afrotropical water snake in relation to a seasonally fluctuating food resource

2005 ◽  
Vol 22 (1) ◽  
pp. 91-100 ◽  
Author(s):  
Luca Luiselli
Keyword(s):  
Prey Size ◽  
Prey Availability ◽  
Interference Competition ◽  
Food Resource ◽  
Wet Season ◽  
Snake Species ◽  
Water Snake ◽  
Body Sizes ◽  
The Difference ◽  
Increased Activity

In this paper, the ecological relationships and the resource partitioning patterns in a two-species system of sympatric aquatic snakes (Grayia smythii and Afronatrix anoscopus) from a riverine forest area in southern Nigeria, West Africa, were tested. The monthly availability of their food resources in the field, and the monthly variation in the feeding relationships between these snakes and their preys, were also studied. Food items of 1245 snakes, i.e. 554 Grayia smythii, and 691 Afronatrix anoscopus, were examined. The mean body length of Grayia smythii was significantly larger than that of Afronatrix anoscopus in any interspecific comparison, i.e. males versus males, females versus females, and females versus males; however, in both species the females attained significantly larger body sizes than the males. 676 prey items were obtained from the stomachs of Afronatrix anoscopus, and 390 from those of Grayia smythii. Both species of snake exhibited an increased activity in the open during the wet months, and this increased activity was positively correlated to the higher abundance of prey during the wet season. In both species the diet consisted of a great variety of different amphibian and fish species. Direct interference competition was not observed. The month-by-month dietary patterns exhibited by the two snake species were similar. Mean prey size was significantly larger in the larger species, and the difference in prey size between the two snake species increased during the dry season, i.e. during the period of reduced prey availability. The monthly availability of the three main food types for these snakes varied, and were significantly more abundant during the wet season (April–September). A positive relationship between prey availability and prey use by snakes strongly suggests that the two snake species are predatory generalists, utilizing prey in relation to their abundance in the field.

scholarly journals PERSEPSI DAN PARTISIPASI MASYARAKAT DALAM PELESTARIAN HUTAN MANGROVE DI DESA MUARA PANTUAN KECAMATAN ANGGANA KABUPATEN KUTAI KARTANEGARA

2018 ◽  
Vol 6 (2) ◽  
pp. 137
Author(s):  
Oon Darmansyah ◽  
Erwiantono Erwiantono
Keyword(s):  
Law Enforcement ◽  
Forest Management ◽  
Mangrove Forest ◽  
Essential Role ◽  
Local Communities ◽  
Coastal Areas ◽  
Mangrove Forests ◽  
Community Perception ◽  
The Law ◽  
And Function

Mangrove forests are one of the vital ecosystem components for coastal areas. Therefore, conservation efforts are required for mangrove forests to prevent damage to the broader mangrove forests. The study of local communities through a perception and participation approach was conducted to identify the problem of mangrove forests damage. Aspects of community perception play an essential role in the formulation of mangrove forest management to ensure the sustainability of mangrove forests and maintain community welfare. The survey was conducted from September to December 2017. Respondents in this study are fishers and fish farmers in Muara Pantuan village, Anggana Sub-district, Kutai Kartanegara Regency whom their occupation directly related to the utilization of mangrove forests. Results showed that about 50% of respondents recognized the existence and function of mangrove forests. 15% of respondents did not know about the rules of mangrove forests. Even 30% of them very did not recognize. Regarding law enforcement, 43% of respondents did not know about the law enforcement of mangrove forests although almost 85% of them stated that the regulation of sustainable mangrove forests was required. Furthermore, for the participation of the community, about 57% of respondents were actively involved in the conservation of mangrove forests.Hutan mangrove adalah salah satu komponen ekosistem penting bagi kawasan pesisir. Dalam rangka mencegah kerusakan hutan mangrove yang lebih luas lagi maka perlu upaya pelestarian terhadap hutan mangrove yang masih tersisa melalui pendekatan persepsi dan partisipasi melalui kajian masyarakat lokal. Hal ini penting mengingat aspek persepsi masyarakat memegang peranan penting dalam perumusan pengelolaan hutan mangrove agar sumberdaya tersebut dapat dipertahankan dan ditingkatkan sehingga dapat menjamin keleslarian dan kepentingan sosial ekonomi masyarakat sekitarnya. Tujuan penelitian adalah untuk mengetahui persepsi serta tingkat partisipasi masyarakat dalam pelestarian hutan mangrove di Desa Muara Pantuan Kecamatan Anggana Kabupaten Kutai Kartanegara. Kegiatan penelitian di lapangan dilakukan selama 2 (dua ) bulan dari bulan September 2017 sampai dengan Desember 2017. Populasi dalam penelitian adalah masyarakat yang terkait langsung dengan pemanfaatan hutan mangrove yaitu nelayan dan petambak. Persepsi masyarakat Desa Muara Pantuan Kecamatan Anggana mengenai hutan mangrove dimana 50% mengetahui keberadaan dan fungsi hutan mangrove. Tetapi masyarakat tidak mengetahui mengenai peraturan hutan mangrove sebesar 15%, bahkan 30% sangat tidak mengerti atau sangat tidak memahami mengenai peraturan hutan mangrove. Demikian pula mengenai sangsi dimana 43% menyatakan tidak tahu mengenai sanksi pemanfaatan hutan mangrove, Namun demikian 85% responden menyatakan perlunya peraturan untuk pelestarian hutan mangrove. Kemudian tingkat partisipasi masyarakat dalam pelestarian hutan mangrove di Desa Muara Pantuan adalah sebesar 57%, yang berarti bahwa masyarakat sudah cukup aktif untuk mendukung pelestarian hutan mangrove.

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