Dataset Information

Assessing the sustainability and adaptive capacity of the gooseneck barnacle co-management system in Asturias, N. Spain.

ABSTRACT: The gooseneck barnacle fishery in Asturias (N. Spain) has undergone three important changes: (1) the early implementation of a co-management system based on Territorial User Rights for Fishing, (2) a change in management measures (due to a decrease in landings), and (3) an economic crisis. This has allowed us to analyze the systems' sustainability in time through examining five critical variables: landings, effort, catch per unit effort (CPUE), mean market prices, and annual revenue. Additionally, we used focus groups and questionnaires to determine the response of the system to these three changes. Co-management has succeeded in maintaining or increasing CPUE throughout all management areas and produced stable mean market prices. This was achieved through flexible management policies and adaptive strategies adopted by the fishers, such as increased selectivity and diversification. The analysis of this fishery provides important lessons regarding the need to understand the evolutionary dynamics of co-management and the importance of embracing adaptive capacity.

SUBMITTER: Rivera A

PROVIDER: S-EPMC4752561 | biostudies-literature | 2016 Mar

REPOSITORIES: biostudies-literature

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Assessing the sustainability and adaptive capacity of the gooseneck barnacle co-management system in Asturias, N. Spain.

Rivera Antonella A Gelcich Stefan S García-Flórez Lucía L Acuña José Luis JL

Ambio 20150724 2

The gooseneck barnacle fishery in Asturias (N. Spain) has undergone three important changes: (1) the early implementation of a co-management system based on Territorial User Rights for Fishing, (2) a change in management measures (due to a decrease in landings), and (3) an economic crisis. This has allowed us to analyze the systems' sustainability in time through examining five critical variables: landings, effort, catch per unit effort (CPUE), mean market prices, and annual revenue. Additionall ...[more]

PMID: 26204856

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Project description:BackgroundPolyandry is a common mating strategy in animals, increasing female fitness through direct (material) and indirect (genetic) benefits. Most theories about the benefits of polyandry come from studies of terrestrial animals, which have relatively complex mating systems and behaviors; less is known about the potential benefits of polyandry in sessile marine animals, for which potential mates may be scarce and females have less control over pre-copulatory mate choice. Here, we used microsatellite markers to examine multiple paternity in natural aggregations of the Pacific gooseneck barnacle Pollicipes elegans, testing the effect of density on paternity and mate relatedness on male reproductive success.ResultsWe found that multiple paternity was very common (79% of broods), with up to five fathers contributing to a brood, though power was relatively low to detect more than four fathers. Density had a significant and positive linear effect on the number of fathers siring a brood, though this relationship leveled off at high numbers of fathers, which may reflect a lack of power and/or an upper limit to polyandry in this species. Significant skew in male reproductive contribution in multiply-sired broods was observed and we found a positive and significant relationship between the proportion of offspring sired and the genetic similarity between mates, suggesting that genetic compatibility may influence reproductive success in this species.ConclusionsTo our knowledge, this is the first study to show high levels of multiple paternity in a barnacle, and overall, patterns of paternity in P. elegans appear to be driven primarily by mate availability. Evidence of paternity bias for males with higher relatedness suggests some form of post-copulatory sexual selection is taking place, but more work is needed to determine whether it operates during or post-fertilization. Overall, our results suggest that while polyandry in P. elegans is driven by mate availability, it may also provide a mechanism for females to ensure fertilization by compatible gametes and increase reproductive success in this sessile species.

Project description:BackgroundThe aim is to investigate the factors that might be associated with the presence of induced abortion (IA) in women prostitutes in Asturias (Spain).Methodology/principal findingsCross-sectional descriptive study by self-completion questionnaire of 212 women prostitutes who attended the three Sexually Transmitted Disease Clinics in Asturias, between January-December 2003. The questionnaire was designed to investigate the women's perceived knowledge (what they claimed to know), their real knowledge (what they really knew), the use of contraceptive methods and socio-demographic variables. Multivariate analysis was carried out. 92% of the participants were immigrants. 76% were practising at brothel. 37.6% (95%CI:30.7-44.4%) reported to have undergone at least one IA during their life. According to the logistic regression the "presence of IA" was directly associated with the variables "number of pregnancies" (OR:65.82;95%IC:7.73-560.14) and "years of practising prostitution" (OR:1.13;95%CI:0.99-1.29); and inversely associated with "children" (0 = no children;1 = one or more children; OR:0.005;95%CI:0.000-0.057), "women's age" (OR:0.89;95%CI:0.82-0.97) and "real contraceptive knowledge" (OR:0.50; 95%CI:0.34-0.75). Married women were more likely to have undergone an IA (OR:2.74;95%IC:1.05-7.13). No association with "perceived contraceptive knowledge" was found.Conclusions/significanceThe characteristics more closely linked to the reproductive history of the women (such as "pregnancies", "children"), together with the "real contraceptive knowledge" and the "time practising prostitution" explain the presence of IA better than factors more closely linked to the conditions in which the women practise prostitution ("place of activity", "other activities compatible with prostitution", "use of safe method in commercial relation"). It is possible that IA is being used as a birth control method, hypothesis suggested by the inverse association observed between the variable "children" and the "presence of IA". Therefore, the promotion of the use of safe contraceptive methods should be a high-priority. If the real contraceptive knowledge was measured correctly, all strategies to increase it would be justified because it was inversely associated with the presence of IA.

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Dataset Information

Assessing the sustainability and adaptive capacity of the gooseneck barnacle co-management system in Asturias, N. Spain.

Publications

Assessing the sustainability and adaptive capacity of the gooseneck barnacle co-management system in Asturias, N. Spain.

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