297 research outputs found
Barnacle demography A matrix modelling approach
No full textSIGLEAvailable from British Library Document Supply Centre-DSC:DXN025945 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Assessing the impact of management on sea anglers in the UK using choice experiments
No full textRecreational sea angling is a popular activity generating significant socio-economic benefits but can impact on fish stocks. The motivations of recreational sea anglers go beyond catch, with a diverse range of motivations relating to physical health and well-being. Heterogenous motives and the popularity of catch and release practices mean that applying commercial fisheries management goals (maximum sustainable yield) to recreational fisheries could result in reduced participation, increased non-compliance, and a subsequent loss of both market and non-market values generated through recreational angling activities. Hence, assessment of sea angler preferences for management is important for the development of appropriate management strategies. In this study, a choice experiment was conducted to assess sea anglers' preferences for changes in UK sea angling management measures. Stated preferences for catching, keeping, and releasing fish due to bag limits and minimum-landing sizes were assessed. Willingness to pay (WTP) estimates for marginal changes of catching the first sea bass on a trip were between £11 and £31 depending on whether the fish could be kept or released and between £11 and £28 for cod, respectively. WTP was much higher for fish caught and kept than caught and released suggesting that consumption of fish was an important motivation. Minimum size was the most considered choice attribute for respondents, while cost was less commonly considered. The implications of the findings are discussed in the context of future management of recreational fisheries
Assessing the welfare impacts of changes in recreational fisheries management: A modelling approach for European sea bass
No full textEconomic appraisal of the impacts of fisheries policies is a legal requirement in many global fisheries and is
crucial for effective policy making. Some changes in costs and benefits attributable to policy can be assessed
through impacts on markets, whilst others are more difficult, as markets may not exist. Analysis is needed to
assess value generated by fisheries under different management regimes. The northern stock of European sea bass
(Dicentrarchus labrax) has declined rapidly over the past decade leading to management of both the commercial
and recreational sectors. Bag limits, closed seasons, and minimum sizes were introduced for recreational fishers,
but the social impact of management measures has not been quantified. Here, we use sea bass to demonstrate a
method for assessing the impact of management measures on recreational fisher welfare. Through combining
stock assessments, individual catch data, and estimates of welfare from a recent choice experiment, differences in
welfare under a range of regulatory scenarios were compared. Nine scenarios based on management imple-
mented between 2014 and 2020 were tested. Highest welfare estimates were found with the lowest levels of
restrictions and lowest estimates for a no-take fishery, which was driven by retained fish having a higher value
than released fish. There was a difference of £ 22.03 million in estimated welfare generated by the recreational
sector between these extremes, with the remaining scenarios amid those values. Our results highlight the need
for policy makers to carefully consider management options that protect both fish stocks and the welfare of
recreational fishers
Rocky shores as tractable test systems for experimental ecology
No full textRocky shore ecology has been studied for a long time, starting with qualitative descriptions and becoming more quantitative and experimental over time. Some of the earliest manipulative experimental ecological studies were undertaken on rocky shores. Many, over time, have made considerable contributions to ecological theory, especially highlighting the importance of biological interactions at the community level. The suitability of rocky shores as convenient test systems for ecological experimentation is outlined. Here we consider contributions from rocky shores to the emerging concepts of supply-side ecology, the roles of competition, predation and grazing, disturbance and succession and positive interactions in structuring communities along environmental gradients. We then address alternative stable states, relationships between biodiversity and ecosystem functioning, and bottom-up and top-down control of ecosystems. We briefly consider the feedback and synergies between ecological concepts and experimental work on rocky shores, whilst still emphasizing the traditional values of marine natural history upheld in JMBA since its first publication. The importance of rigorous experimental designs championed by Underwood and co-workers is emphasized. Recent progress taking advantage of new technologies and emerging approaches is considered. We illustrate how experimental studies have shown the importance of biological interactions in modulating species and assemblage-level responses to climate change and informed conservation and management of coastal ecosystems
Estimates of numbers, participation, expenditure, and activity by marine recreational fishers in Europe (reproduced from Hyder et al. [19]).
No full textEstimates of numbers, participation, expenditure, and activity by marine recreational fishers in Europe (reproduced from Hyder et al. [19]).</p
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Ali Husain Mir Interview
No full textAli Husain Mir is a Bollywood lyricist and script writer and a professor of Management at William Paterson University. Mir visited the Hindi Urdu Flagship at the University of Texas at Austin to speak to Flagship students about his career in Urdu literature and Bollywood production. For this interview, Mir sat down with HUF directors, Syed Akbar Hyder and Herman van Olphen, to discuss his background in Urdu and the state of the language in modern India. Mir is the author of Anthems of Resistance, the definitive book on the All India Progressive Writers’ Movement; he is also an acclaimed lyricist and script-writer for Hindi and Urdu films (Iqbal, Dor). Mir’s oeuvre engages issues of religious minorities and secularism in South Asia.Asian Studie
Models of open populations with space-limited recruitment: extension of theory and application to the barnacle Chthamalus montagui
No full text1. Barnacles are a good model organism for the study of open populations with space-limited recruitment. These models are applicable to other species with open supply of new individuals and resource limitation. The inclusion of space in models leads to reductions in recruitment with increasing density, and thus predictions of population size and stability are possible.2. Despite the potential generality of a demographic theory for open space-limited populations, the models currently have a narrow empirical base. In this study, a model for an open population with space-limited recruitment was extended to include size-specific survival and promotions to any size class. The assumptions of this model were tested using data from a pan-European study of the barnacle Chthamalus montagui Southward. Two models were constructed: a 6-month model and a periodic annual model. Predicted equilibria and their stabilities were compared between shores.3. Tests of model assumptions supported the extension of the theory to include promotions to any size class. Mortality was found to be size-specific and density independent. Studied populations were open, with recruitment proportional to free space.4. The 6-month model showed a significant interaction between time and location for equilibrium free space. This may have been due to contrasts in the timing of structuring processes (i.e. creating and filling space) between Mediterranean and Atlantic systems. Integration of the 6-month models into a periodic annual model removed the differences in equilibrium-free space between locations.5. Model predictions show a remarkable similarity between shores at a European scale. Populations were persistent and all solutions were stable. This reflects the apparent absence of density-dependent mortality and a high adult survivorship in C montagui. As populations are intrinsically stable, observations of fluctuations in density are directly attributable to variations in the environmental forcing of recruitment or mortality
Balancing the social, economic, and ecological impacts of small-scale and recreational fisheries
No full textConveners: Kieran Hyder (UK), Harry V. Strehlow (Germany), Cristina Pita (Portugal), Rapporteur: Johanna Ferretti (Germany).No abstracts are to be cited without prior reference to the author.Marine recreational fishing in Europe: current status and future challenges: Kieran Hyder, Harry V. Strehlow.Small-scale fisheries in Europe: status, challenges and opportunities: Cristina Pita, José J. Pascual Fernández, Maarten Bavinck.Traditional or modern? Variations in provisional and cultural ecosystem services from marine recreational fishing in Norway: Trude Borch, Aas, Ø, Stensland, S, Selvaag, S K.Social or ecological sustainability? Attitudes towards stricter harvest regulations of Norwegian marine recreational fisheries: Øystein Aas, Stian Stensland, Trude Borch, Sofie Selvaag, Ben Beardmore, Robert Arlinghaus, Alf Ring Kleiven, Jon Helge Vælstad.Field surveying of marine recreational fisheries in Norway using a novel spatial sampling frame reveals striking under-coverage of alternative sampling frames:: Jon Helge Vølstad, M. Christman, K. Ferter, A.R. Kleiven, H. Otterå, Ø. Aas, R. Arlinghaus, T. Borch, J. Colman, B. Harthill, T. Haugen, K. Hyder, J.M. Lyle, M.J. Ohldieck, C. Skov, H.V. Strehlow, D. van Voorhees, M.S. Weltersbach, E.D. Weber.Sustainable coastal fishery management: A systems approach balancing resource use and production of Atlantic cod under changing climate conditions: Dinesen G.E., Neuenfeldt S., Kokkalis A., Lehmann A., Egekvist J., Kristensen K., Munk P., Hüssy K., Støttrup J.G.The impact of uncertainty in recreational fisheries catches on management advice for the European sea bass (Dicentrarchus labrax): Gwladys Lambert, Allan Hicks, Lisa Readdy, Estanis Mugerza, Lucia Zarauz, Kieran Hyder.Measuring the social value of sea angling: combining revealed and stated preference approaches for the UK: Angela Muench, Barnaby Andrews, Gaetano Grilli, Kieran Hyder.Balancing biological sustainability, economic value and social benefits in the management of fisheries with commercial and recreational exploitation: the application of system dynamics modelling to the European Sea bass (Dicentrarchus Labrax L.): Hannah Tidbury, Angela Muench, Kieran Hyder.How do biological, environmental and socioeconomic variables influence marine recreational fishing pressure over time?: Zachary Radford, Kieran Hyder, Stephen Simpson, Martin Genner.Towards a framework for the co-production of social evidence for fisheries governance in the UK: Julie Urquhart, Hannah Chiswell, Paul Courtney, Rosanna Mann, John Powell, Matt Reed.Understanding the behaviour of the UK under 10m sea bass fishing fleet: Joseph Watson, Kieran Hyder, Robert Thorpe, Shovonlal Roy, Richard Sibly.Recreational angling for coastal Danish seatrout: understanding motives, catch and harvest orientation and angler heterogeneity among locals and tourists: Christian Skov, Casper Gundelund, Robert Arlinghaus, Hans Jakob Olesen.Developing a grid-based population simulation model to link conservation prioritization tools with tactical fisheries management: Yunzhou Li, Ming Sun, Chongliang Zhang, Binduo Xu, Yiping Ren, Yong Chen.Painting a picture of small scale fisheries in the Belgian seascapes: Katrien Verlé, Klaas Sys, Ellen Pecceu, Thomas Verleye, Frankwin van Winsen, Ann-Katrien Lescrauwaet.Attraction, repulsion, and connection: how data from smartphone applications provide insight into the behaviour of recreational anglers: Paul Venturelli, K. Hyder, C. Skov.A comparison of creel survey data and citizen science data from a nationwide smartphone app designed for collecting recreational fisheries data: Casper Gundelund, Paul Venturelli, Kieran Hyder, Bruce Hartill, C. Skov.A participatory-based mapping of the small-scale inshore fisheries: Towards a holistic management in the Bay of Biscay: Estanis Mugerza, Arantza Murillas, Esti Diaz, Luis Arregi.Big camera, little camera: panoramic giga-pixel and trail cameras for studies of recreational fishers: Tim P. Lynch, Georgina Wood, David J. Flynn, Carlie Devine, David Hughes, Gary Curtis, William Figueira, Michael Burton, Alexandra Hegarty, Jeremy Lyle, Scott Foster.Pescardata – assessing marine recreational fisheries in Portugal: Mafalda Rangel, Pontes, J., Veiga, P., Bentes, L., Monteiro, P., Diogo, H., Guerreiro, A., Pio Quinto, D., Oliveira, F., Araújo, G., Pais, H., Sousa, I., Silva, I., Carvalho, S., Pita, P., Coelho, R., Villasante, S., Gonçalves, J.M.S., Erzini, K.Estimating recreational fishing from private boats along the Swedish coast: Hege Sande, Andreas Sundelöf, Nuno Prista, Esha Mohamed, Michele Casini.Swimming upstream - fishing community-lead initiatives for sustainable rural transitions on the east coast of Sweden: Milena Arias Schreiber, Ida Wingren, Sebastian Linke.Assessment approaches for managing impacts of harvest and climate change on a rights-based northern salmonid fishery: Kimberly L. Howland, Colin P. Gallagher, Ross F. Tallman.The shifting sands of California’s beach-spawning grunion, Leuresthes tenuis: K. L. M. Martin, E. Pierce, V. Quach, M. Studer.Valuing to manage: estimating the economic benefits of recreational fisheries in Portugal: Carina Vieira da Silva,, Renato Rosa, Ana Faria, Mafalda Rangel, Luís Bentes, Pedro Monteiro, Pedro Veiga, João Pontes, Frederico Oliveira, Jorge MS Gonçalves, Karim Erzini, Hugo Diogo, Maria A. Cunha-e-Sá.Assessing non-monetary values of the modern seashore forager: Elisabeth Morris-Webb, Freya A.V. St John, Stuart R. Jenkins.Dpesca: a smartphone app to report recreational fisheries data. First data in boat fishing and spearfishing in Andalucía (Spain): Matías Lozano, Teresa García, Jorge Baro, Maria Ángeles Torres, Luis Silva.Navigating towards a stable and comprehensive framework to collect data on marine recreational fisheries in complex socioecological systems: the case study of Spain: Pablo Pita, Sebastián Villasante.Reconstruction of marine fisheries catches can guide the development of public policies: Sebastian Villasante, Macho G, Antelo M, Pita P, Garcia-Rodrigues J, Verutes G, Derrick B.Spearfishing profiles, habits and perceptions towards management measures: a Portuguese case study: J.M.S Gonçalves, P. Veiga, M. Rangel, J. Assis, C. Pita.Estimating catch-per-unit-effort using inverse sampling design: Esha Mohamed.Multiple approaches to understanding recreational fishers’ management preferences: Mary Mackay, Yamazaki, S, Lyle, J.</p
Citizen science and marine policy
No full textThis chapter provides a broad overview of the value and challenges of scientists and the public contributing to marine policy development and implementation. One area where coastal and marine citizen science especially holds promise is in support of policy and legislation. Marine legislation is increasing in complexity, and large data sets and evidence base are generally required to support decisions about marine policy and management because the questions that need addressing are at large spatial and temporal scales. The environmental areas in which citizen science was most embedded were non-marine biodiversity, with embeddedness in marine biodiversity much lower. Citizen science can make use of many different types of technologies, and as new technologies become available, the application of citizen science will continue to change and adapt. Citizen science data may also be used to monitor changes in the environment caused by climate change by providing information to which policy makers can respond
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