Body stoichiometry, the balance of elements in organisms, is linked to ecosystem functioning through variation among and within species in acquisition, assimilation, allocation, and excretion of elements. Elemental composition of organisms varies with evolutionary history and environment. Environmental conditions including temperature, predation pressure, and duration of the growing season can alter the elemental composition (carbon (C), nitrogen (N), and phosphorous (P)) of organisms when environmental conditions alter organismal growth rates. Organisms use P rich ribosomal RNA to translate proteins for growth, thus organisms with high growth rates should contain more P than organisms with slower growth rates. Using a large database of organismal stoichiometry of aquatic invertebrates (STOICH), we explored relationships between latitude, which changes the duration of the growth season, temperature and organismal C, N, and P content. We are also exploring the relationship between latitude and C:P, C:N, and N:P ratios. Currently, we are analyzing 554 individuals from 25 macroinvertebrate families spanning North America. For multiple families (Coenagrionidae and Heptageniidae), we found a positive relationship between %P and latitude (200% and 300% increase respectively across 30 degrees of latitude) yet for other families, we detected no relationship. For %N, we found no trends with latitude for any families. This research elucidates the environmental drivers of organismal C, N and P content and elemental ratios and can inform our understanding of how climate change and increased temperatures at high latitudes may affect aquatic animal species.