New Publication: Hybridisation in the Tarantula Hobby

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  New Publication: Hybridisation in the Tarantula Hobby I am pleased to share the publication of my latest paper, “Hybridisation in the Tarantula Hobby: Ethical Boundaries and Biological Consequences,” in the Journal of the British Tarantula Society , Volume 41, No. 1, September 2026. The paper addresses an issue that deserves serious consideration within the tarantula community: hybridisation and its potential long-term effects on the integrity of captive lineages. More Than a Breeding Decision The tarantula hobby has changed considerably over the past several decades. What was once a relatively small community has grown into an international network of keepers, breeders, vendors, researchers, and societies. Captive breeding has contributed enormously to that growth, improving husbandry knowledge and increasing the availability of captive-bred animals. With that success comes responsibility for the lineages we maintain. Hybridisation may seem like an isolated breeding experiment,...

Seasonal constraints on maternal body size induce transgenerational fitness penalties in a sheet-web spider

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Seasonal constraints on maternal body size induce transgenerational fitness penalties in a sheet-web spider

Abstract

  1. Seasonal environmental fluctuations profoundly shape the life-history strategies of arthropod predators, frequently altering population dynamics and trophic interactions within natural systems.
  2. However, how extreme seasonal constraints, such as compounded thermal stress and nutritional bottlenecks, are transgenerationally transmitted via maternal effects remains a critical question in evolutionary ecology.
  3. We investigated these transgenerational constraints in the sheet-web spider Hylyphantes graminicola. We collected field-matured parental cohorts during early summer (temperate conditions with abundant aquatic insect pulses) and early autumn (severe thermal stress and aquatic resource depletion), and evaluated the developmental and reproductive performance of their F1 offspring under standardized laboratory conditions.
  4. The synergistic pressures of late-summer heat and resource depletion significantly miniaturized early-autumn maternal phenotypes. This environmentally induced constraint inflicted a deleterious ‘Silver Spoon’ effect on the F1 generation: despite receiving ad libitum prey, the early-autumn F1 lineage suffered prolonged development, elevated juvenile mortality and a catastrophic collapse in egg hatching rates. Notably, mating behaviors of surviving F1 adults remained robust, indicating a profound decoupling between behavioral canalization and underlying physiological viability.
  5. Our results demonstrate a progressive manifestation of nutritional deficits, indicating that generic caloric intake cannot rescue specific maternally inherited biochemical shortfalls. Ultimately, this study illustrates that standard behavioral metrics can mask severe transgenerational physiological distress, emphasizing the evolutionary and demographic vulnerabilities of arthropod populations facing seasonal bottlenecks.
Zheng, Z., Shao, Y., Li, C., Qi, C., Liu, Z., Zhang, H., Zhou, Y., Wen, L., & Li, C. Seasonal constraints on maternal body size induce transgenerational fitness penalties in a sheet-web spider母体体型的季节性约束对草间钻头蛛产生跨代适合度代价. Ecological Entomology. https://doi.org/10.1111/een.70124