Fishing of marine mollusks in Acapulco de Juarez, Guerrero, is intense and diverse and there is little knowledge about this resource. Therefore, for most of species subject to fishing there is no regulation. Due to this, the aims of this study were update inventory of mollusks that are fished for human consumption, determine species that are most important and analyze composition of catch sizes. Biological samples were taken from 2011 to 2014, directly from catches of fishermen. 72 interviews were conducted. 48 species were identified and 16 were the most important. In most species, organisms that did not reach size that would allow them to participate in renewal of reproductive stock were captured. Fishery biological studies are necessary to contribute to regulation of coastal fishing of mollusks.

Contamination of aquatic ecosystems by microplastics (MPs) is mainly due to the release of high levels of MP particles from treated effluents by wastewater treatment plants (WWTPs). Due to the lack of policies and regulations establishing criteria for the control and elimination of MPs from WWTP effluents, this research evaluates the presence of 38 and 150 µm MPs in influents and effluents from three WWTPs in the port of Acapulco, Mexico. Optical microscopy and Fourier transform infrared spectroscopy revealed that the MPs were polyethylene, polypropylene, polyethylene terephthalate, and polyvinyl chloride. MP removal efficiencies of 82.5–98.7% (38 µm) and 86.8–97.5% (150 µm) were achieved. Moreover, the MP average daily emissions to the receiving bodies of the three WWTPs ranged from 9.5 × 10⁶ to 4.70 × 10⁸ particles, while the annual emissions ranged from 3.05 × 10⁹ to 1.72 × 10¹¹ particles. This work reveals the urgency of implementing regulatory policies to avoid the continuous emission of MPs into aquatic ecosystems from WWTPs in Acapulco, Mexico.

English How do societies value and interact with ecosystem services (ES) to favor their long-term conservation? Under the premise that sociocultural assessment of ES offers an expanded perspective for potential societal nature contributions, we present here the empirical results of a participative assessment of ES in the Laguna de Nuxco coastal wetland in 2019. The methodological design includes the combination of applied qualitative tools on site and quantitative methods for analysis of information. The results emphasize that the ES of the wetland support socioeconomic needs and important socio-cultural community traits, such as cultural heritage and identity as fishing communities. We identify emerging socio-ecological conflicts that promote the decrease of ES. We suggest conceptual and methodological adaptations for the participative assessment of ES on the local scaleSpanish ¿Cómo las sociedades valoran e interactúan con los servicios ecosistémicos (SE) que les rodean para favorecer su conservación a largo plazo? Bajo la premisa que la valoración sociocultural de SE ofrece una perspectiva ampliada para potenciales contribuciones sociedad-naturaleza, presentamos aquí los resultados empíricos de una valoración participativa de SE del humedal costero Laguna de Nuxco en 2019. El diseño metodológico incluyó la combinación de herramientas cualitativas aplicadas en sitio y cuantitativas para el análisis de información. Los resultados enfatizan que los SE del humedal sustentan necesidades socioeconómicas e importantes aspectos socioculturales como patrimonio cultural e identidad como comunidades pesqueras. Identificamos conflictos socioecológicos emergentes que promueven la disminución de SE. Sugerimos adecuaciones conceptuales y metodológicas para la valoración participativa de SE en la escala local.French Comment les sociétés valorisent-elles et interagissent-elles avec les services écosystémiques (SE) pour favoriser leur conservation à long terme? Le principe de l’évaluation socioculturelle des SE off re une perspective élargie des contributions potentielles société-nature, et est utilisé pour présenter les résultats empiriques d’une évaluation participative des SE réalisée en 2019 dans la zone humide côtière de Laguna de Nuxco, au Mexique. La méthodologie comprenait la combinaison d’outils qualitatifs sur site et d’outils quantitatifs pour l’analyse de l’information. Les résultats soulignent que les SE de la zone humide répondent aux besoins socio-économiques et à des aspects socioculturels tels que le patrimoine culturel et l’identité en tant que communautés de pêcheurs. Nous identifions les conflits socio-écologiques émergents qui favorisent la diminution des SE. Nous suggérons des adaptations conceptuelles et méthodologiques pour l’évaluation participative des SE à l’échelle locale.

Metazoan parasite communities can experience temporal structural changes related to seasonal and/or local variations in several biotic and abiotic environmental factors. However, few studies have addressed this issue in tropical regions, where changes in water temperature are less extreme than in temperate regions, so the factors or processes that can generate variations in these parasite communities are as yet unclear. We quantified and analysed the parasite communities of 421Lutjanus peru(Nichols & Murphy, 1922) collected from Acapulco Bay in Guerrero, Mexico, over a four-year period (August 2018 to April 2021), to identify any interannual variation due to local biotic and abiotic factors influenced by natural oceanographic phenomena, such as El Niño–Southern Oscillation, or La Niña. Twenty-five metazoan parasite taxa were recovered and identified: seven Digenea species; two Monogenea; one Cestoda; one Acanthocephala; four Nematoda; and ten of Crustacea (seven Copepoda and three Isopoda). The digeneans and copepods were the best represented parasite groups. The parasite communities were characterized by a high numerical dominance of helminth larvae. Species richness at the component community level (13 to 19 species) was similar to reported richness in otherLutjanusspp. The parasite communities ofL. peruhad a high variability in species composition, but low aggregate variability (e.g. species diversity), suggesting that structure of these communities may be quite stable over time. A clear interannual variation pattern was not observed, suggesting that parasite species of this host may respond differently to variations in environmental factors. Interannual variations were possibly caused by a combination of biotic (i.e. host feeding behaviour and body size) and local abiotic factors (influenced by climatic anomalies) which generated notable changes in the infection levels of several component species.

Pesticides optimize agricultural and livestock activity but their improper management damages health and the environment. The objective of this study was to carry out a baseline study of future intervention and reference locations to implement an intervention program. Two intervention locations and a third reference location were selected. Subsistence farmers and their relatives were surveyed on socio-demographic characteristics, pesticide management, clothing used in agricultural work, use of PPE, and perception about damage to their health and the environment. Simple frequencies were estimated and differences in proportions or means were compared, as well as associated factors. The inadequate arrangement of packaging represents an environmental problem because most empty containers are dispersed in the field. PPE are insufficient and are not used due to discomfort and lack of money. Health damage from pesticide use, low education level and training in pesticide management were associated with not using PPE, while having used pesticides ≤20 years was associated with a lower possibility of not using PPE. The most frequent symptoms of intoxication reported were headache, burning eyes, dizziness, skin irritation and weakness. Subsistence farmers reported that pesticides contaminate soil and water, causing damage to the environment. It is necessary to implement programs aimed at training in pesticide management.