Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Los manglares son sistemas que mediante la interacción marino terrestre varían durante el tiempo y son altamente productivos. El objetivo del estudio fue describir la granulometría, parámetros fisicoquímicos y nutrientes del humedal de Mata de Limón. En el año 2014, se establecieron seis parcelas de monitoreo para analizar los sedimentos, nutrientes y parámetros fisicoquímicos. Se encontró mayor presencia de arenas, en especial las gruesas. Los valores de pH fueron muy similares, la mayoría cercanos a 8; mientras que la oxidación-reducción mostró una predominancia a procesos reductivos con un mínimo de -54 y un máximo de -3 mV. En cuanto a los nutrientes la concentración más alta de amonio fue de 29.2 μmol/L, en tanto que la más baja fue de cero. En el caso del nitrato, la superior fue de 30.53 μmol/L, y la inferior de 1.01 μmol/L. Tanto para los fosfatos como los silicatos, la mayor fue de 21.59 y 174.95 μmol/L, y la menor de 0.71 y 19.66 μmol/L respectivamente. El humedal de Mata de Limón está conformado mayormente por arenas; los parámetros fisicoquímicos están afectados por variaciones espaciotemporales, y un alto contenido de nutrientes. Sin embargo, es perturbado por presiones antropogénicas, causando inestabilidad en las variables evaluadas, lo que incrementa su complejidad; por el contrario, el sistema fluvial corresponde a un patrón más estable con cambios predecibles al interior del ecosistema.

The immersed roots of red mangrove constitute a substrate where a variety of invertebrates breed and feed, being one of the most productive tropical ecosystems. With the objective of studying the benthic macrofauna attached to Rhizophora mangle roots in the wetland Ciénaga de La Palmita, 8 stations were sampled in May 2018; the two roots extracted from each station were placed in plastic bags and fixed with 10% formalin. Water temperature, depth, salinity, and transparency were measured. In the laboratory, each root was washed and scraped superficially, and the invertebrates were retained in a 425 µm sieve and preserved in 70% alcohol. Specimens were quantified and identified by taxonomic keys. A total of 27,014 individuals were quantified, with three Phyla identified: Arthropoda, Annelida, and Mollusca, distributed in six classes, 13 orders, 19 families, and 20 species. Crustaceans represented 93.6% of the composition, followed by annelids (3.3%), mollusks (1.6 %), and hexapods (1.5%). Total richness was 20 species. The constancy index yielded 14 constant species, 3 accessory and 3 accidental. The Shannon-Wienner index varied, finding greater diversity in station 4 (H' = 2.01). The cirripede Balanus amphitrite was the dominant species, followed by the tanaidacean Sinelobus stanfordi and the amphipod Americorophium sp., estuarine species adapted to tropical areas. Physicochemical parameters indicate that this is an environment with little fluctuation and low salinity, where marine species and estuarine species converge, presenting a low proportion and richness of mollusks and a high proportion and abundance of crustaceans.

O caranguejo sem boca, Cardisoma crassum, é um recurso pesqueiro de importância socioeconômica, portanto, entender seu padrão de distribuição é fundamental para seu manejo. O objetivo desta pesquisa foi estabelecer se os caranguejos exibem segregação de tamanho em habitats contrastantes. Três parcelas foram amostradas de fevereiro a junho de 2022 para coletar dados sobre variáveis biométricas em Ponuga, Veraguas, Panamá Pacífico. Foram capturados 151 caranguejos com largura média de cefalotórax de 56.24 ± 8.56 mm; 97 machos e 54 fêmeas, com uma proporção inclinada para os machos (1,8:1). Os caranguejos da parcela 1 alcançaram maior tamanho e peso ​do que as das parcelas 2 e 3. Fêmeas ovígeras foram encontradas apenas nas parcelas 1 e 2, durante o mês de junho (período chuvoso). A largura mínima do cefalotórax das fêmeas funcionalmente maduras foi de 47.11 mm. De acordo com essa medida, fêmeas maduras estiveram presentes em maiores proporções em todas as parcelas e foram mais abundantes na parcela 1. Caranguejos pequenos foram segregados na parcela 3; a parcela de origem e tamanho foram significativamente associadas. Este é o primeiro relato de segregação por tamanho e estágio de vida em Cardisoma crassum. Os resultados destacam a importância das características do habitat e abrem caminho para novas pesquisas sobre as causas desse padrão de distribuição.

Mysidopsis gemina Price, Heard & Vargas, 2019, uma espécie de camarão misidáceo registrada no Pacífico da Costa Rica, foi coletada no oeste do México, em 19 de outubro de 2022, na entrada do Golfo da Califórnia. Este é o primeiro registro ao norte da Costa Rica e representa uma extensão ao norte de cerca de 13 graus de latitude. Apresenta-se uma comparação entre os caracteres morfológicos diagnósticos do material da Costa Rica e do México.

In the teaching of science, experiences are carried out which seek for students to develop skills to describe and compare phenomena or make measurements, prioritizing the sense of vision. This leads to reflect on particular strategies when this sense is lacking. For this reason, in recent years, a set of actions derived from the public education policy have been undertaken, which have made it possible to include people with visual functional diversity (VFD) in the teaching and learning processes of physics, thus allowing for continuous reflection on pedagogical and didactic aspects in which the sensory conditions of the students are recognized. To identify the theoretical and methodological advances in this field, a review of articles was carried out, with an observation window from 2010 to 2022, using different databases and searching in journals specialized in the teaching of physics. It was found that it is an emerging field of research in which progress has been made with respect to adaptation, the construction of didactic material, and software design, so that this community can access the explanations given within the framework of science on phenomena of the natural world, making use primarily of the senses of touch and hearing.

             

             

             

             

This research analyzes the jurisprudential work in the determination of thevalidity conditions for the exercise of the unilateral faculty of geographic mobility in thePeruvian legal system. Despite the lack of specific regulation on the modification ofsubstantial working conditions; and, based on the generic regulation of the limits ofmanagement power, the ius variandi principle and the dispositions on acts of hostility by theemployer, both the Supreme Court and the Constitutional Court, have decided that thedecision of geographical mobility, as it affects one of the substantial conditions of theemployment contract, it requires the business proof of the reasonable justifying cause relatedto the needs of the company and the proof of the reasons for the choice of this specificworker. Likewise, it requires that the business decision does not cause any detriment to the worker, understanding as such any patrimonial or non-patrimonial damage that unreasonablyaffects the rights and interests of the worker or those of his family nucleus. Such demandsshow a judicial work framed within the constitutional mandate to provide protection to theworker and to guarantee the effective enforcement of human rights in the labor law. Finally,such requirements would be meaningless if mechanisms were not established within thescope of the labor judicial process to facilitate, as in fact has happened, the proof of theabusive act committed by the employer. The judicial criteria on evidentiary facilitation willalso be analyzed-through the evidence test-that helps to make effective the protectiveprinciple in the field of the labor judicial process.