Beyond A Vision for The Future: Tangible Steps To Engage Diverse Participants in Inclusive Field Experiences.

Recent strides toward improving diversity, equity, and inclusion (DEI) in field biology present a unique opportunity for transdisciplinary exploration of the impacts and state of a topic that has remained hereto largely underexplored and under-discussed in the academic setting. Within current literature, themes of racial and gender inequity, power imbalances, unsafe environments, and underdeveloped infrastructure and resources are widespread. Thus, we organized a symposium that addressed these compelling issues in field biology DEI through a multitude of experiential and academic lenses. This article will orient the reader to the special issue and offer summative goals and outcomes of the symposium that can provide tangible steps toward creating meaningful improvements in the state of DEI and safety in field settings.

Best Practices to Promote Field Science Safety.

Interventions are necessary to address the ongoing epidemic of sexual harassment and assault in field settings. An evidence-based approach to identifying specific interventions will be most effective at promoting the safety of scientists. We present the results of a workshop conducted by experts in field biology and the study of sexual harassment and assault that identified a comprehensive set of best practices for individuals and organizations. These recommendations are grounded in peer-reviewed scholarship and are separated into four topics: culture change, accountability, policy development, and reporting. The resulting report of the workshop recommends 44 practices, categorized by the resources required for implementation, the time frame of implementation, and the level of organization responsible for implementation. The best practices that we present are designed to support individuals and organizations in the development of field safety plans.

Local environmental variables are key drivers of ant taxonomic and functional beta-diversity in a Mediterranean dryland.

The decomposition of beta-diversity (ß-diversity) into its replacement (ßrepl) and richness (ßrich) components in combination with a taxonomic and functional approach, may help to identify processes driving community composition along environmental gradients. We aimed to understand which abiotic and spatial variables influence ant ß-diversity and identify which processes may drive ant ß-diversity patterns in Mediterranean drylands by measuring the percentage of variation in ant taxonomic and functional ß-diversity explained by local environmental, regional climatic and spatial variables. We found that taxonomic and functional replacement (ßrepl) primarily drove patterns in overall ß-diversity (ßtot). Variation partitioning analysis showed that respectively 16.8%, 12.9% and 21.6% of taxonomic ßtot, ßrepl and ßrich variation were mainly explained by local environmental variables. Local environmental variables were also the main determinants of functional ß-diversity, explaining 20.4%, 17.9% and 23.2% of ßtot, ßrepl and ßrich variation, respectively. Findings suggest that niche-based processes drive changes in ant ß-diversity, as local environmental variables may act as environmental filters on species and trait composition. While we found that local environmental variables were important predictors of ant ß-diversity, further analysis should address the contribution of other mechanisms, e.g. competitive exclusion and resource partitioning, on ant ß-diversity.

Exoskeletal thinning in Cephalotes atratus ants (Hymenoptera: Formicidae) parasitized by Myrmeconema neotropicum (Nematoda: Tetradonematidae).

Some parasites modify the color of their arthropod hosts, presumably to facilitate transmission to a new host. Mechanisms for such changes often are unknown, but altered exoskeletal color in adult insects typically occurs via structural modifications or redistribution of pigments. Here, we examine the cuticle structure of workers of the Neotropical canopy ant Cephalotes atratus infected with the nematode Myrmeconema neotropicum. We hypothesized that the conspicuous red color of the gaster (the globular posterior body region) of infected ants results from structural changes, specifically localized exoskeletal thinning. We used scanning electron microscopy to quantify the thickness of gaster cuticle in healthy and infected ants. For comparison, we also measured the cuticle thickness of the head of each ant, which is black in both infected and healthy individuals. The gaster cuticle was 23% thinner in infected ants (average ±SE: 14.8 ± 1.02 µm) versus healthy ants (19.2 ± 0.65 µm) after correcting for body size. In contrast, the thickness of the head exoskeleton was similar among groups. We conclude that parasite-induced thinning of the exoskeleton is associated with the red color of the gaster. Other mechanisms, including translocation or leaching of melanin (by the ant or the parasite, respectively) may operate in concert with thinning to effect the color change, and would be an appropriate extension of this research.