Bibliometric investigation of the integration of animal personality in conservation contexts.

Consistent individual differences in behavior, commonly termed animal personality, are a widespread phenomenon across taxa that have important consequences for fitness, natural selection, and trophic interactions. Animal personality research may prove useful in several conservation contexts, but which contexts remains to be determined. We conducted a structured literature review of 654 studies identified by combining search terms for animal personality and various conservation subfields. We scored the relevance of personality and conservation issues for each study to identify which studies meaningfully integrated the 2 fields as opposed to surface-level connections or vague allusions. We found a taxonomic bias toward mammals (29% of all studies). Very few amphibian or reptile studies applied personality research to conservation issues (6% each). Climate change (21%), invasive species (15%), and captive breeding and reintroduction (13%) were the most abundant conservation subfields that occurred in our search, though a substantial proportion of these papers weakly integrated conservation and animal personality (climate change 54%, invasive species 51%, captive breeding and reintroduction 40%). Based on our results, we recommend that researchers strive for consistent and broadly applicable terminology when describing consistent behavioral differences to minimize confusion and improve the searchability of research. We identify several gaps in the literature that appear to be promising and fruitful avenues for future research, such as disease transmission as a function of sociability or exploration as a driver of space use in protected areas. Practitioners can begin informing future conservation efforts with knowledge gained from animal personality research.

Investigación bibliométrica sobre la integración de la personalidad animal a los contextos de conservación Resumen Las diferencias individuales y constantes en el comportamiento, comúnmente llamadas personalidad animal, son un fenómeno generalizado en los taxones con consecuencias importantes para la aptitud, selección natural e interacciones tróficas. Las investigaciones sobre la personalidad animal pueden ser útiles en varios contextos de conservación, aunque falta determinar cuáles son estos contextos. Realizamos una revisión literaria estructurada de 654 estudios identificados mediante la combinación de los términos de búsqueda para la personalidad animal y varios subcampos de la conservación. Puntuamos la relevancia de la personalidad y los temas de conservación en cada estudio para identificar cuáles de estos integraron significativamente a ambos campos, contrario a las conexiones a nivel superficial o alusiones vagas. Descubrimos un sesgo taxonómico por los mamíferos (29% de todos los estudios). Pocos estudios enfocados en anfibios o reptiles aplicaron un estudio de personalidad a los temas de conservación (6% para cada uno). El cambio climático (21%), las especies invasoras (15%) y la reproducción en cautiverio y las reintroducciones (13%) fueron los subcampos de conservación más abundantes que aparecieron en nuestra búsqueda, aunque una proporción significativa de estos artículos integraron muy poco a la conservación y la personalidad animal (cambio climático 54%, especies invasoras 51%, reproducción en cautiverio y reintroducciones 40%). Con base en nuestros resultados, recomendamos que los investigadores procuren tener terminologías consistentes y de aplicación generalizada cuando describan las diferencias conductuales para así minimizar las confusiones y facilitar la búsqueda durante la investigación. Identificamos varios vacíos en la literatura que prometen ser vías fructíferas para las investigaciones en el futuro, como la transmisión de enfermedades como una función sociable o la exploración como un impulsor del uso del espacio en las áreas protegidas. Los practicantes pueden comenzar por guiar los siguientes esfuerzos de conservación con el conocimiento obtenido de las investigaciones sobre la personalidad animal.

Territory acquisition mediates the influence of predators and climate on juvenile red squirrel survival.

Juvenile survival to first breeding is a key life-history stage for all taxa. Survival through this period can be particularly challenging when it coincides with harsh environmental conditions such as a winter climate or food scarcity, leading to highly variable cohort survival. However, the small size and dispersive nature of juveniles generally make studying their survival more difficult. In territorial species, a key life-history event is the acquisition of a territory. A territory is expected to enhance survival, but how it does so is not often identified. We tested how the timing of territory acquisition influenced the winter survival of juvenile North American red squirrels Tamiasciurus hudsonicus, hereafter red squirrels, and how the timing of this event mediated the sources of mortality. We hypothesized that securing a territory prior to when food resources become available would reduce juvenile susceptibility to predation and climatic factors overwinter. Using 27 years of data on the survival of individually marked juvenile red squirrels, we tested how the timing of territory acquisition influenced survival, whether the population density of red squirrel predators and mean temperature overwinter were related to individual survival probability, and if territory ownership mediated these effects. Juvenile red squirrel survival was lower in the years of high predator abundance and in colder winters. Autumn territory owners were less susceptible to lynx Lynx canadensis and possibly mustelid Mustela and Martes spp., predation. Autumn territory owners had lower survival in colder winters, but surprisingly non-owners had higher survival in cold winters. Our results show how the timing of a life-history event like territory acquisition can directly affect survival and also mediate the effects of biotic and abiotic factors later in life. This engenders a better understanding of the fitness consequences of the timing of key life-history events.