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Quetglas A.,Spanish Institute of Oceanography | Rueda L.,Spanish Institute of Oceanography | Alvarez-Berastegui D.,SOCIB Balearic Islands Coastal Observing and Forecasting System | Guijarro B.,Spanish Institute of Oceanography | Massuti E.,Spanish Institute of Oceanography
PLoS ONE | Year: 2016

According to their main life history traits, organisms can be arranged in a continuum from fast (species with small body size, short lifespan and high fecundity) to slow (species with opposite characteristics). Life history determines the responses of organisms to natural and anthropogenic factors, as slow species are expected to be more sensitive than fast species to perturbations. Owing to their contrasting traits, cephalopods and elasmobranchs are typical examples of fast and slow strategies, respectively.We investigated the responses of these two contrasting strategies to fishing exploitation and environmental conditions (temperature, productivity and depth) using generalized additive models. Our results confirmed the foreseen contrasting responses of cephalopods and elasmobranchs to natural (environment) and anthropogenic (harvesting) influences. Even though a priori foreseen, we did expect neither the clear-cut differential responses between groups nor the homogeneous sensitivity to the same factors within the two taxonomic groups. Apart from depth, which affected both groups equally, cephalopods and elasmobranchs were exclusively affected by environmental conditions and fishing exploitation, respectively. Owing to its short, annual cycle, cephalopods do not have overlapping generations and consequently lack the buffering effects conferred by different age classes observed in multi-aged species such as elasmobranchs. We suggest that cephalopods are sensitive to short-term perturbations, such as seasonal environmental changes, because they lack this buffering effect but they are in turn not influenced by continuous, long-term moderate disturbances such as fishing because of its high population growth and turnover. The contrary would apply to elasmobranchs, whose multi-aged population structure would buffer the seasonal environmental effects, but they would display strong responses to uninterrupted harvesting due to its low population resilience. Besides providing empirical evidence to the theoretically predicted contrasting responses of cephalopods and elasmobranchs to disturbances, our results are useful for the sustainable exploitation of these resources. © 2016 Quetglas et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Source


Diedrich A.,SOCIB Balearic Islands Coastal Observing and Forecasting System | Tintore J.,SOCIB Balearic Islands Coastal Observing and Forecasting System | Tintore J.,CSIC - Mediterranean Institute for Advanced Studies
Coastal Management | Year: 2012

Research related to social-ecological systems may be enhanced through multi-method approaches to collecting interdisciplinary data and using combinations of analytical tools. In this article we combine different types of data (interval, ordinal, nominal, spatial), methods (participant observation, survey instrument), and analytical tools (IBM Statistical Package for the Social Sciences [SPSS] and Geographic Information Systems [GIS]) to identify management relevant linkages across social and ecological dimensions in a Mediterranean suburban beach setting. In particular, we demonstrate the central role of quantitative perception data for identifying pragmatic environmental management measures in coastal recreation scenarios. © Taylor & Francis Group, LLC. Source


Diedrich A.,SOCIB Balearic Islands Coastal Observing and Forecasting System | Diedrich A.,James Cook University | Terrados J.,CSIC - Mediterranean Institute for Advanced Studies | Arroyo N.L.,CSIC - Mediterranean Institute for Advanced Studies | Balaguer P.,SOCIB Balearic Islands Coastal Observing and Forecasting System
Ocean and Coastal Management | Year: 2013

Recreational boating is a globally significant nature-based industry, which can degrade sensitive benthic habitats through physical damage from anchors. Mooring buoys can eliminate this impact and lead to additional benefits such as more efficient use of space, increasing the well-being and safety of boaters, and generating revenue through user fees. Evidence that buoys positively influence the well-being of users, especially if this is reflected in a willingness to pay, may provide motivation to decision-makers to invest in this management measure yet, to the best of our knowledge, relatively little is known about what motivates boaters to use buoys. Based on the theory of reasoned action, this study uses the classification tree method to model the influence of behavioral and normative beliefs on two dependent variables; boaters' perceived likelihood to use buoys and willingness to pay (WTP) in a Marine Protected Area (MPA) located in a heavily used Bay on the island of Mallorca in the Balearic Islands of Spain. This MPA was designated to protect Posidonia oceanica, an endemic seagrass in the Mediterranean, which has been significantly degraded by structural damage from anchors. Data were collected using a survey instrument administered to recreational boaters in the summer of 2011. The data showed overall user support for buoys, and a positive relationship between attitudes (associated with perceptions of safety, space, and minimizing impacts on P.oceanica) and WTP and behavioral intent. The data also indicated a positive influence of awareness of the potential negative impacts of anchoring on P.oceanica and the role of buoys in minimizing these effects on both dependent variables. Attitudes towards crowding in the study site had a very minor influence and normative beliefs did not feature as predictors in our models. The study is part of a larger research initiative to assess the physical, social, and environmental dimensions of recreational boating on the island of Mallorca. The theoretical framework, data collection and statistical assessment methods are broadly applicable to interdisciplinary research on use of coastal and marine space. © 2013 Elsevier Ltd. Source

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