scholarly journals Actual status of fishing reserves of the Yesil River

2019 ◽  
Vol 36 ◽  
pp. 1-9
Author(s):  
Zhumagazy Kurzhykayev ◽  
Kuanysh Syzdykov ◽  
Ainur Assylbekova ◽  
Dinara Sabdinova ◽  
Viktor Fefelov
Keyword(s):  
Biological Diversity ◽  
Biological Indicators ◽  
The State ◽  
Reference Points ◽  
Boundary Values ◽  
Sustainable Fisheries ◽  
Fish Stocks ◽  
Fish Resources ◽  
Managerial Decisions ◽  
Careful Management

In this article, the study and prediction of the state of fish resources in the Yesil River was carried out to determine the boundary reference points of the reserve and management decisions in case they are exceeded, to ensure sustainable fisheries and preserve biological diversity. Ichthyological studies, retrospective analyses and rankings of the effects of the water supply of the Yesil River on fish stocks have been carried out, critical values ​​of the biomass of fishing reserves have been determined, as criteria for biologically safe fishing values and targets for management of fish stocks at reaching the boundary values ​​of 24.03 tonnes have been established. According to the results of studies of basic biological indicators, it was determined that roach, bream, pike and perch populations each had an LC50 above LM50, which indicates their low utilization in the fishery industry. A strategy for management of fish stocks, recommendations for the conservation of fishery resources and their rational use has been developed as a result of these findings. The list and status of the monitored indicators for the careful management of fish stocks, as well as a list and indicators of the boundary indicators for the state of fish stocks, was established. These parameters included the fish size of 50% of the sampled fish and 50% of maturity achieved, where the LC50 was observed in the fish in question from 19 to 45.4 cm and LM50 from 12.3 to 41 cm, respectively. The minimum and maximum river levels that ranged from 111 up to 159 cm, as well as the critical value of the commercial reserve, corresponded to the boundary value of 24.03 tonnes. The results of this work will serve as the basis for making future managerial decisions, necessary for sustainable fisheries and conservation of the biological diversity of the Yesil River.

scholarly journals Evolution of the state of fish stocks in the Northeast Atlantic within a precautionary framework, 1970–2003: a synoptic evaluation

2005 ◽  
Vol 62 (8) ◽  
pp. 1603-1608 ◽  
Author(s):  
S.M. Garcia ◽  
J.I. De Leiva Moreno
Keyword(s):  
Time Lag ◽  
The State ◽  
Reference Points ◽  
Fishing Mortality ◽  
Fish Stocks ◽  
The North ◽  
Value Judgements ◽  
The Status ◽  
The Mean ◽  
Spawning Biomass

Abstract The state and trajectory of some of the stocks assessed by ICES in the North Atlantic in the period 1970–2003 are synoptically represented on a single system of representation of fishing mortality and biomass with precautionary reference points used as limits and thresholds. The results indicate that for nearly 30 years, the status of the stocks in relation to the precautionary reference points has been degrading in terms of spawning biomass and excess fishing mortality, driving most resources down close to and often beyond those reference points. The situation seems to have improved during the past decade, with some exceptions, as shown by progressive shift of the mean position of the stocks away from excessive mortality (since the early 1990s) and, after a time-lag, away from low biomass (since the early 2000s). The proposed representation system sticks to the reference points and value judgements used in the ICES context, but could be used with any equivalent precautionary system of representation.

La valorisation des prestations non-bois: particularités genevoises (essai) | Commercialization of non-wood forest services: the case of Geneva (essay)

2009 ◽  
Vol 160 (8) ◽  
pp. 232-234
Author(s):  
Patrik Fouvy
Keyword(s):  
Forest Regeneration ◽  
Biological Diversity ◽  
The State ◽  
Forest Land ◽  
Private Forests ◽  
The Public ◽  
Public Body ◽  
Provision Of Services ◽  
History Of ◽  
Near Future

The history of the forests in canton Geneva, having led to these being disconnected from productive functions, provides a symptomatic demonstration that the services provided by the forest eco-system are common goods. Having no hope of financial returns in the near future and faced with increasing social demands, the state has invested in the purchase of forest land, financed projects for forest regeneration and improvement of biological diversity and developed infrastructures for visitors. In doing this the state as a public body takes on the provision of services in the public interest. But the further funding for this and for expenses for the private forests, which must be taken into account, are not secured for the future.

Subfossil insect remains (Chironomidae) and lake-water temperature inference in the Sisimiut–Kangerlussuaq region, southern West Greenland

2000 ◽  
pp. 78-82 ◽  
Author(s):  
Klaus Peter Brodersen ◽  
N. John Anderson
Keyword(s):  
Climate Variability ◽  
Water Temperature ◽  
Lake Water ◽  
Anthropogenic Impact ◽  
Biological Diversity ◽  
Biological Indicators ◽  
Lake Ecosystems ◽  
West Greenland ◽  
Physical Chemical ◽  
Temperature Inference

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Brodersen, K. P., & Anderson, N. J. (2000). Subfossil insect remains (Chironomidae) and lake-water temperature inference in the Sisimiut–Kangerlussuaq region, southern West Greenland. Geology of Greenland Survey Bulletin, 186, 78-82. https://doi.org/10.34194/ggub.v186.5219 _______________ Climate and water temperature have an important influence on the functioning of lake ecosystems. From limnological and palaeolimnological studies of lakes, information on biological diversity and climate variability in time and space can be gleaned from physical, chemical and biological indicators preserved in the lake sediments. The lakes in southern West Greenland are particularly useful for this purpose – they are numerous, diverse and have minimal anthropogenic impact (Anderson & Bennike 1997). Palaeolimnological data are fundamental for understanding the functioning and development of modern lakes and for understanding the causes of climatic change as well as the effect on lake biota.

scholarly journals Quirky patterns in time-series of estimates of recruitment could be artefacts

2014 ◽  
Vol 72 (1) ◽  
pp. 111-116 ◽  
Author(s):  
M. Dickey-Collas ◽  
N. T. Hintzen ◽  
R. D. M. Nash ◽  
P-J. Schön ◽  
M. R. Payne
Keyword(s):  
Time Series ◽  
Stock Assessment ◽  
Meta Analysis ◽  
Reference Points ◽  
Fish Stocks ◽  
Stock Recruitment ◽  
Modelling Assumptions ◽  
Meta Analyses ◽  
Recruitment Model ◽  
Recruitment Time

Abstract The accessibility of databases of global or regional stock assessment outputs is leading to an increase in meta-analysis of the dynamics of fish stocks. In most of these analyses, each of the time-series is generally assumed to be directly comparable. However, the approach to stock assessment employed, and the associated modelling assumptions, can have an important influence on the characteristics of each time-series. We explore this idea by investigating recruitment time-series with three different recruitment parameterizations: a stock–recruitment model, a random-walk time-series model, and non-parametric “free” estimation of recruitment. We show that the recruitment time-series is sensitive to model assumptions and this can impact reference points in management, the perception of variability in recruitment and thus undermine meta-analyses. The assumption of the direct comparability of recruitment time-series in databases is therefore not consistent across or within species and stocks. Caution is therefore required as perhaps the characteristics of the time-series of stock dynamics may be determined by the model used to generate them, rather than underlying ecological phenomena. This is especially true when information about cohort abundance is noisy or lacking.

"Hyperspectral data processing and adaptive modelling for the Natural Objects properties detection"

2018 ◽  
Author(s):  
Olga V. Grigoreva ◽  
Viktor F. Mochalov ◽  
Vjasheslav A. Zelentsov
Keyword(s):  
Remote Sensing Data ◽  
Hyperspectral Data ◽  
The State ◽  
Reference Points ◽  
The Black Sea ◽  
Earth Remote Sensing ◽  
Natural Objects ◽  
State Of Water ◽  
Heterogeneous Models ◽  
Adaptive Modelling

"The article proposes a method for assessing the state of natural objects that is based on the complex use of heterogeneous models and hyperspectral Earth remote sensing data used to estimate the parameters of these models. The base model is an artificial neural network, for the training of which multiparametric models of radiation transfer, gradient search algorithms, as well as regression empirical models supplementing them, can be used and adaptively adjusted. The advantage of the method is the ability to determine the state of water bodies and vegetation under conditions of uncertainty with the possibility of making more precise estimates for the limited volume of ground measurements at reference points. Examples of approbation of the method in determining the state of coastal waters of the Black Sea with the use of hyperspectral imaging materials from “Resurs-P” satellite, as well as in assessing the state of vineyards, are shown."

scholarly journals The Effect of Forest Fragmentation on Polistinae

Sociobiology ◽  
2019 ◽  
Vol 66 (3) ◽  
pp. 508
Author(s):  
Ederson Tadeu Bueno ◽  
Marcos Magalhães de Souza ◽  
Mateus Aparecido Clemente
Keyword(s):  
Food Webs ◽  
Forest Fragmentation ◽  
Natural Enemies ◽  
Natural Environment ◽  
Biological Diversity ◽  
Social Wasps ◽  
The State ◽  
Environmental Services ◽  
Flower Visitors ◽  
Semideciduous Seasonal Forest

The forest fragmentation is caused by natural or anthropic actions, which affect negatively the biota and the environmental services rendered by biological diversity. However, there is little information on the reflex of these actions in many different groups of animals, such as social wasps, which are abundant and significantly present in neotropical environments, causing a major impact in the communities they live due to their role in food webs. As their natural enemies, wasps are important in the control of agricultural plagues; in the natural environment, they are nectar collectors, frequent flower visitors, and potential pollinators of many species of plants. These factors justify studies which would evaluate in what way the forest fragmentation acts on these insects biodiversity. This study was carried out in four fragments, each of a different size, located in the municipalities of Inconfidentes and Ouro Fino, in the south of the state of Minas Gerais (Brazil), where the phytophysiognomy is the Montane Semideciduous Seasonal Forest. The research was carried out between December 2016 and March 2018, with the same sampling collection for each fragment, totalizing 104 sampling days. In total, 28 species and 51 colonies were recorded in the four areas and a greater richness for the greatest fragment (F4). The conclusion reached was that the size and heterogeneity of the fragment have an important role in maintaining the richness of social wasps. 

scholarly journals KERUGIAN SUMBER DAYA IKAN AKIBAT PRAKTIK MARK DOWN KAPAL PENANGKAP IKAN DI INDONESIA

2018 ◽  
Vol 12 (2) ◽  
pp. 133
Author(s):  
Maulana Firdaus ◽  
Yesi Dewitasari ◽  
Radityo Pramoda ◽  
Sonny Koeshendrajana
Keyword(s):  
Good Governance ◽  
Secondary Data ◽  
Resource Depletion ◽  
Economic Loss ◽  
Study Data ◽  
Production Model ◽  
Fishing Vessel ◽  
Sustainable Fisheries ◽  
Fish Resources ◽  
Iuu Fishing

Dampak praktik Illegal Unreported and Unregulated Fishing (IUUF) telah mengakibatkan terganggunya pengelolaan pemanfaatan perikanan yang berkelanjutan dan menimbulkan kerugian ekonomi. Praktik mark down ukuran kapal penangkapan ikan merupakan salah satu penyalahgunaan perizinan dalam konteks praktik IUUF. Penelitian ini bertujuan untuk mengkaji nilai kerugian sumber daya ikan (deplesi sumber daya) akibat praktik “mark down” ukuran kapal penangkap ikan yang dilakukan di Indonesia. Penelitian dilaksanakan pada bulan Maret – April 2017 bersifat ‘desk study’ dan dilengkapi dengan kajian literature terkait. Data sekunder dan primer digunakan dalam penelitian ini. Analisis data dilakukan melalui Pendekatan Surplus Produksi Model Schaefer digunakan dalam penelitian ini. Nilai kerugian sumber daya ikan diketahui berdasarkan nilai deplesinya. Nilai deplesi sumber daya menggunakan pendekatan The Net Price Method. Hasil penelitian menunjukkan bahwa adanya praktik “mark down” telah menyebabkan deplesi sumber daya ikan atau pengurangan aset sumber daya ikan di perairan Indonesia. Besarnya nilai deplesi sumber daya pada tahun 2015 mencapai 9,83 trilyun rupiah dan diprediksi pada tahun 2020 meningkat menjadi 14,55 trilyun rupiah. Kajian merekomendasikan perlunya percepatan pengukuran ulang kapal perikanan dan penerapan sangsi yang tegas terhadap pelanggar sehingga tata kelola pemanfaatan sumber daya perikanan tangkap yang baik yang mampu mewujudkan pengelolaan perikanan yang berkelanjutan di Indonesia. Tittle: Fish Resources Losses Due to Mark Down Fishing Vessel Practiced in IndonesiaThe impact of IUU fishing has resulted in management disorder of sustainable fisheries and it caused economic loss. Markdown in vessels size is one type of manipulation practices of license in IUU fishing. This study aims to analyze the loss value of fish resources (resource depletion) due to the “markdown” practices in Indonesia. The study was basically a desk study completmenting with relevant literatures review during March – April 2015. Primary and secondary data were used in this study. Data were analyzed using the Schaefer surplus production model approached. Loss value of fish resources was estimated in terms of depletion resource value using the Net Price Method. The research found that “mark down” has led to depletion or reduction of fish resources in Indonesian waters. The estimated value of resource depletion in 2015 reached 9.83 trillion rupiahs and it is predicted to rise into 14.55 trillion rupiahs in 2020. The research suggests the need to accelerate the process of re-measuring the size of fishing vessel as well as to impose sanctions for the disobedience of the rules, so that Indonesia could have a good governance in fisheries resource management with sustainable fisheries resources.

The UN and Its Agencies in the Development of Regulations on Management and Conservation of Fisheries: A Plurality of Initiatives but Questionable Coherence

2018 ◽  
Vol 21 (1) ◽  
pp. 63-82
Author(s):  
Chie Sato
Keyword(s):  
Fish Consumption ◽  
Regional Level ◽  
Sustainable Fisheries ◽  
Fish Resources ◽  
Management And Conservation

Although various organizations have been established for the management and conservation of fisheries and these have contributed to the establishment of common regulations pertaining to the management of fisheries on a global or regional level, current measures for the management and conservation of fish resources do not appear to be very effective. This article attempts to clarify the current problems involved in the management and conservation of fisheries and what kinds of regulations are necessary to manage sustainable fisheries effectively in an era of increasing fish consumption.

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