Marine Ecology. 2019;e12534. wileyonlinelibrary.com/journal/maec | 1 of 14 https://doi.org/10.1111/maec.12534 © 2018 Blackwell Verlag GmbH 1 | INTRODUCTION Artemesia longinaris Spence Bate, 1888, popularly known as the sti‐ letto shrimp, is endemic in the Western South Atlantic, and it is dis‐ tributed from Atafona, Rio de Janeiro State, Brazil (21.6°S 41.00°W) to Rawson, Chubut province, Argentina (43.3°S 65.0°W), extending over 3,800 km (D'Incao, 1999). The exploitation of A. longinaris has recently increased due to decreases in the stocks of traditionally more profitable species, such as the pink shrimp Penaeus brasilien‐ sis (Latreille, 1817) and P. paulensis (Pérez‐Farfante, 1967) and the seabob shrimp Xiphopenaeus kroyeri (Heller, 1862) (Carvalho‐Batista, Simões, Lopes, & Costa, 2011; Costa, Fransozo, & Pinheiro, A.P. (2004); D'Incao, Valentini, & Rodrigues, 2002). Previous studies have shown that A. longinaris exhibits a pat‐ tern of increased size at sexual maturity and maximum size of in‐ dividuals following a latitudinal gradient, from Ubatuba (São Paulo, Brazil) to Mar del Plata (Buenos Aires Province, Argentina) (Castilho, Gavio et al., 2007; Costa, Branco, Machado, Campos, & Avila, 2010). However, in a tropical region at lower latitude, but near the upwell‐ ing area (Farol de São Tomé), the values of maturity, maximum sizes, and longevity of the species increased (Semensato & Di Beneditto, 2008). Reproduction of the species tends to occur throughout the Received: 18 July 2017 | Revised: 29 September 2018 | Accepted: 15 December 2018 DOI: 10.1111/maec.12534 ORIGINAL ARTICLE The Cabo Frio upwelling overrides geographical patterns in the population dynamics of the shrimp Artemesia longinaris Spence Bate, 1888 (Decapoda: Penaeidae) Abner Carvalho‐Batista 1,2 | João Alberto Farinelli Pantaleão 1 | Antonio Leão Castilho 3 | Rogério Caetano da Costa 1 1 Laboratory of Biology of Freshwater and Marine Shrimp (LABCAM), Department of Biological Sciences, Faculty of Sciences, São Paulo State University (UNESP), Bauru, Brazil 2 Instituto de Ciências da Saúde, Universidade Paulista (UNIP), São Paulo, SP, Brazil 3 Laboratory of Carcinology, Zoology Department, Biosciences Institute of Botucatu, UNESP, Botucatu, Brazil Correspondence Abner Carvalho‐Batista, Laboratory of Biology of Freshwater and Marine Shrimp (LABCAM), Department of Biological Sciences, Faculty of Sciences, São Paulo State University (UNESP), Bauru, Brazil. Email: carvbatis@gmail.com Funding information This study was funded by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP; AR:#2009/54672‐4) and Coordenação de Aperfeiçoamento Pessoal de Nível Superior—CAPES (Ciências do Mar II Proc. 2005/2014— 23038.004308/2014‐14). Abstract Upwelling areas are among the most productive ecosystems on the planet, influenc‐ ing the biology of marine organisms. This study investigated the population dynamics of the shrimp Artemesia longinaris in two regions in southeastern Brazil, one inside (Macaé—Rio de Janeiro State) and one outside (Ubatuba—State of São Paulo) the Cabo Frio upwelling area. The aim was to verify the influence of the upwelling phe‐ nomenon on the abundance, growth, longevity, size of sexual maturity, and reproduc‐ tive period of the species. In total, 188,902 individuals were captured at Macaé and 3,461 at Ubatuba. Individuals captured at Macaé showed larger maximum size, higher longevity, and slower growth rate, besides reaching sexual maturity at larger sizes than at Ubatuba. Continuous reproduction was observed in both regions, with juve‐ nile recruitment peaks in spring and summer. Local conditions observed at Macaé were influenced by the Cabo Frio upwelling zone, characterized by productive and cooler waters that are around 20°C during most of the year. The upwelling phenom‐ enon is probably the main factor influencing the population parameters studied here, changing the geographic patterns previously observed for the variation of these pa‐ rameters in A. longinaris. KEYWORDS geographical patterns, growth, Macaé, population biology, reproduction, Ubatuba