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- Detection and mitigation of paraphysomonas sp., a chrysophycean responsible for the collapse of industrial tisochrysis lutea culturesPublication . José, Mélissa; Paulino, Cristina; Schüler, Lisa; Pinto, Bruno; Carneiro, Mariana; Rodrigues, Alexandre M. C.; Pereira, Filipe; Pereira, Hugo; Varela, JoãoMicroalgae are increasingly recognized as a sustainable resource to address challenges associated with climate change and population growth, owing to their capacity to produce high-quality biomass for applications in feed, food, and cosmeceuticals. However, the expansion of microalgae-based industries remains constrained by harmful biological contaminants (HBCs), which can rapidly reduce productivity, often signalled by visible changes in culture appearance (e.g., cell aggregation and discoloration), and may ultimately lead to culture collapse and substantial economic losses. In this study, the grazer Paraphysomonas sp. (Chrysophyceae) was identified as the most likely cause of Tisochrysis lutea culture collapse in a large-scale production facility using high-throughput amplicon sequencing of the 18S rDNA gene. To enable early detection of this HBC during the scale-up process, a species-specific primer pair targeting the 18S rDNA gene was developed and optimized, allowing detection of Paraphysomonas sp. at relative abundances as low as 0.1%. The contaminant was first detected at the final stage of scale-up, in a tubular photobioreactor. To further characterize the impact of the grazer and support mitigation strategies, its feeding behaviour was examined. Laboratory-scale mitigation trials showed that treatment with germanium dioxide (GeO2) at 1 mg L⁻ 1 effectively delayed contaminant proliferation and prevented culture collapse without adversely affecting T. lutea growth. These findings highlight the value of integrating molecular monitoring with targeted mitigation strategies to improve early detection and management of HBCs in industrial microalgae production systems.
- The future of the tourism professionPublication . Correia, Antónia; Kozak, MetinThe tourism profession is recognised as a rewarding and self-fulfilling career that enacts our personal, social and human skills. Nevertheless, the new dynamics of society create challenges difficult to overcome in the tourism sector (Baum & Hai, 2020; Singh et al., 2025) that deserve further research. For example, the narrative of a low-reputation career, often accompanied by claims of low wages and the precarity of working conditions, undermines the appeal of a profession that is far from monotonous. Further, the new global and technological reality (Kyprianou & Zopiatis, 2006), along with unexpected hazards such as COVID-19 (Foo et al., 2021; Park et al., 2022) and geopolitical change (Cooper & Hall, 2024), hinders attraction and retention. Also contributing to the turnover is the persistent conflict between family and work (Aksatan et al., 2020; Haldorai et al., 2019). These topics do not drain all the challenges that the future of tourism and hospitality professions face. For example, also critical is the very announced digital transformation (Kırlar-Can et al., 2024; Sigala, 2020), which consolidates remote work (Kozak et al., 2024), and poses a new threat to talent dynamics (Matthews & Greenspan, 2020). Those clues are discussed in this special issue, along with very relevant research studies.
- Invited reply: response to: towards a universal definition of ‘domestication’Publication . Robert Spengler, III; Oliveira, HugoKosovsky et al. have responded to two recent attempts at unifying the scientific community under one definition for domestication—Spengler et al. [1] titled: Seeking consensus on the domestication concept and Lord et al.’s [2] recent paper, titled: A universally applicable definition of domestication. We will quickly comment on the main critiques raised by Kosovsky et al. [3], which seem focused more on the proposal from Lord et al. In both cases, these groups of scholars draw awareness to important issues, but ultimately, we read both of their discussions as demonstrations for the need to unify the multidisciplinary array of scholars currently studying domestication. Without a consensus on the definition, we are all trapped in a semantics skirmish that impedes scientific progress.