Experimental studies on the feeding and reproduction of Calanoides patagoniensis (Copepoda,Calanoid) in a southern upwelling ecosystem of the Humboldt Current |
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| Institution: | 1. Department of Informatics, Federal University of Paraná, Curitiba, Brazil;2. Federal Technological University of Paraná, Toledo, Brazil;3. Department of Applied Computing, Federal University of Santa Maria, Santa Maria, Brazil;1. Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile;2. Instituto de Química, Pontifícia Universidad Católica de Valparaíso, Av. Brasil 2950, Valparaíso, Chile;3. Instituto de Oceanografia, Universidade Federal do Rio Grande – FURG, Rio Grande, RS 96203-900, Brazil;4. Departamento de Ciências do Mar, Universidade Federal de São Paulo - UNIFESP, Av. Almirante Saldanha da Gama, 89, Santos, SP 11030-400, Brazil;1. Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, 310 allée des Ursulines, CP 3300, Rimouski, Québec G5L 3A1, Canada;2. Department of Fisheries and Oceans, Bedford Institute of Oceanography, 1 Challenger Drive, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada;3. Takuvik Joint International Laboratory, Laval University (Canada) - CNRS (France), UMI3376, Département de biologie, Université Laval, Pavillon Alexandre Vachon, 1045 avenue de la médecine, Québec, Québec G1V 0A6, Canada;4. Sorbonne Universités, UPMC Univ Paris 06, INSU-CNRS, Laboratoire d''Océanographie de Villefranche, 181 Chemin du Lazaret, Villefranche-sur-mer 06230, France;1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China;2. East China Mineral Exploration and Development Bureau of Nonferrous Metal, Jiangsu Province 210007, China;3. Development Research Center, China Geological Survey, Beijing 100037, China |
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| Abstract: | Seasonal cohorts of the large-sized copepod Calanoides patagoniensis allowed testing the relative ability of this species to exploit food resources that prevail during winter time in southern upwelling ecosystems of the Humboldt Current. This was achieved by considering a local winter flagellate assemblage (WFA), Thalassiosira rotula isolated from the local spring phytoplankton and a laboratory culture of Prorocentrum minimum, as food offers in consecutive 96 h experiments. Ingestion rates (IR) varied between 7 and 14 μg C f?1 d?1, egg production reached a peak of 70 eggs while egg production rates (EPR) varied between 27 ± 6 and 31 ± 4 eggs f?1 d?1. Feeding and reproductive traits were dependent on food offer, and after 72 h both IR and EPR decreased by 28% and 40% respectively, when copepods were steadily fed with the diatom. The relatively high reproductive performance supported by WFA was notable; showing the feeding behavior of this species can couple with food availability in the field with successful reproductive outcomes. Migration strategies allowing remain in upper food-rich coastal waters along with this flexible trophic behavior may better explain why this species is among the most recurrent ones in these variable yet productive upwelling areas. |
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