Venom composition of the Iberian adder (Vipera seoanei) from northern Portugal reveals limited sex and size variation

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  Venom composition of the Iberian adder (Vipera seoanei) from northern Portugal reveals limited sex and size variation Abstract Snake venom is a complex and dynamic ecological trait, with high potential for intraspecific variation. In this study, the venom composition of the Iberian adder ( Vipera seoanei ) from the Peneda Mountains of northern Portugal was investigated to explore whether venom varies with body size and sex. Venom proteomes from six individuals representing juvenile, subadult, and adult males and females were characterised using LC–MS/MS, while individual variation was assessed from SDS–PAGE profiles of 18 snakes. LC–MS/MS identified 144 proteins, dominated by phospholipases A 2 (PLA 2 ), snake venom serine proteases (svSP), and C-type lectin-related proteins (CTL). Descriptive comparisons revealed contrasting individual profiles, particularly between the juvenile male, characterised by high svSP and svMP abundance, and the juvenile female, characterised by high ...

The magnitude of legal wildlife trade and implications for species survival

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The magnitude of legal wildlife trade and implications for species survival

The unsustainable use of wildlife is a primary driver of global biodiversity loss. No comprehensive global dataset exists on what species are in trade, their geographic origins, and trade's ultimate impacts, which limits our ability to sustainably manage trade. The United States (US) is one of the world's largest importers of wildlife, trade data being compiled in the US Law Enforcement Management Information System (LEMIS), the only comprehensive publicly-accessible wildlife trade database of non-CITES listed species. In total, 21,097 species and over 2.85 billion individuals were traded over the past 22 years (2000-2022). When LEMIS data is combined with CITES records, the US imported over 29,445 wild species, including over 50% of all globally described species in some taxonomic groups. For most taxa, around half of the individuals are declared as sourced from the wild. Although LEMIS provides the only means to assess trade volumes for many taxa, without any associated data on most wild populations, it is impossible to assess the impact or sustainability of trade, or any potential risk of pest or pathogen spread. Furthermore, these insights underscore the likely under-estimation of trade, and the urgent need for other countries to adopt similar mechanisms to accurately record trade.


Alice Hughes, Benjamin Marshall, Aubrey Alamshah et al. The magnitude of legal wildlife trade and implications for species survival, 30 January 2024, PREPRINT (Version 1) available at Research Square [https://doi.org/10.21203/rs.3.rs-3890407/v1]