The role of seabird guano in maintaining North Atlantic summertime productivity.
Sci Total Environ
; 897: 165309, 2023 Nov 01.
Article
em En
| MEDLINE
| ID: mdl-37406699
ABSTRACT
Nutrients supplied via seabird guano increase primary production in some coastal ecosystems. A similar process may occur in the open ocean. To investigate this directly, we first measured bulk and leachable nutrient concentrations in guano sampled in the North Atlantic. We found that guano was strongly enriched in phosphorus, which was released as phosphate in solution. Nitrogen release was dominated by reduced forms (ammonium and urea) whilst release of nitrate was relatively low. A range of trace elements, including the micronutrient iron, were released. Using in-situ bioassays, we then showed that supply of fresh guano to ambient seawater increases phytoplankton biomass and photochemical efficiencies. Based on these results, modelled seabird distributions, and known defecation rates, we estimate that on annual scales guano is a minor source of nutrients for the surface North Atlantic. However, on shorter timescales in late spring/summer it could be much more important Estimates of upper-level depositions of phosphorus by seabirds were three orders of magnitude higher than modelled aerosol deposition and comparable to diffusion from deeper waters.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Ecossistema
/
Nitrogênio
Limite:
Animals
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article