Climate-induced year-class fluctuations of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae) in the Río de la Plata estuary, Argentina-Uruguay
The whitemouth croaker, Micropogonias furnieri, is exploited by coastal fisheries in the Plata estuary. Its age structure shows the predominance of certain year classes, which are indicative of recruitment variability. The estuary is affected by river discharge variations associated with climatic si...
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2012
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10546006_v21_n1_p58_Acha http://hdl.handle.net/20.500.12110/paper_10546006_v21_n1_p58_Acha |
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paper:paper_10546006_v21_n1_p58_Acha2023-06-08T16:03:10Z Climate-induced year-class fluctuations of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae) in the Río de la Plata estuary, Argentina-Uruguay Simionato, Claudia Gloria El Niño Southern Oscillation Modeling Recruitment Retention River discharge Time series analysis age structure air temperature breeding season climate effect ecological modeling El Nino-Southern Oscillation estuarine ecosystem exploitation ichthyoplankton larva otolith percid recruitment (population dynamics) river discharge runoff spectral analysis survivorship time series analysis Argentina Rio de la Plata Uruguay The whitemouth croaker, Micropogonias furnieri, is exploited by coastal fisheries in the Plata estuary. Its age structure shows the predominance of certain year classes, which are indicative of recruitment variability. The estuary is affected by river discharge variations associated with climatic signals (El Niño Southern Oscillation and others). We hypothesize that recruitment may correlate: (i) negatively with runoff (low runoff would promote the stronger retention of ichthyoplankton); (ii) positively with temperature (higher temperatures should enhance larvae survivorship and/or expand the spawning season); and (iii) positively with the wind zonal component (stronger onshore winds should facilitate the retention of ichthyoplankton). A time series of the relative cohort strengths was constructed for the 1938-2000 period from the age frequencies based on otolith readings. We performed a spectral analysis of the biological and physical series, and we searched for co-movements between them, which suggested the presence of mechanistic links. The results showed co-movements for recruitment, runoff and air temperature series at approximately 6.5, 3.4 and 2.4yr; the temperature reinforced the runoff effects on recruitment at the 6.5-yr peak, and it weakened them at the 3.4- and 2.4-yr peaks. Wind variability was not relevant for the time scales studied. To explore the mechanisms of retention, we modeled the effects of the runoff fluctuations on the dispersal of the eggs. Both the statistical and modeling results supported the hypothesis that the effects of extreme river discharges on retention may regulate croaker recruitment by promoting high (low) recruitment during low (high) discharge periods. © 2011 Blackwell Publishing Ltd. Fil:Simionato, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10546006_v21_n1_p58_Acha http://hdl.handle.net/20.500.12110/paper_10546006_v21_n1_p58_Acha |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
El Niño Southern Oscillation Modeling Recruitment Retention River discharge Time series analysis age structure air temperature breeding season climate effect ecological modeling El Nino-Southern Oscillation estuarine ecosystem exploitation ichthyoplankton larva otolith percid recruitment (population dynamics) river discharge runoff spectral analysis survivorship time series analysis Argentina Rio de la Plata Uruguay |
| spellingShingle |
El Niño Southern Oscillation Modeling Recruitment Retention River discharge Time series analysis age structure air temperature breeding season climate effect ecological modeling El Nino-Southern Oscillation estuarine ecosystem exploitation ichthyoplankton larva otolith percid recruitment (population dynamics) river discharge runoff spectral analysis survivorship time series analysis Argentina Rio de la Plata Uruguay Simionato, Claudia Gloria Climate-induced year-class fluctuations of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae) in the Río de la Plata estuary, Argentina-Uruguay |
| topic_facet |
El Niño Southern Oscillation Modeling Recruitment Retention River discharge Time series analysis age structure air temperature breeding season climate effect ecological modeling El Nino-Southern Oscillation estuarine ecosystem exploitation ichthyoplankton larva otolith percid recruitment (population dynamics) river discharge runoff spectral analysis survivorship time series analysis Argentina Rio de la Plata Uruguay |
| description |
The whitemouth croaker, Micropogonias furnieri, is exploited by coastal fisheries in the Plata estuary. Its age structure shows the predominance of certain year classes, which are indicative of recruitment variability. The estuary is affected by river discharge variations associated with climatic signals (El Niño Southern Oscillation and others). We hypothesize that recruitment may correlate: (i) negatively with runoff (low runoff would promote the stronger retention of ichthyoplankton); (ii) positively with temperature (higher temperatures should enhance larvae survivorship and/or expand the spawning season); and (iii) positively with the wind zonal component (stronger onshore winds should facilitate the retention of ichthyoplankton). A time series of the relative cohort strengths was constructed for the 1938-2000 period from the age frequencies based on otolith readings. We performed a spectral analysis of the biological and physical series, and we searched for co-movements between them, which suggested the presence of mechanistic links. The results showed co-movements for recruitment, runoff and air temperature series at approximately 6.5, 3.4 and 2.4yr; the temperature reinforced the runoff effects on recruitment at the 6.5-yr peak, and it weakened them at the 3.4- and 2.4-yr peaks. Wind variability was not relevant for the time scales studied. To explore the mechanisms of retention, we modeled the effects of the runoff fluctuations on the dispersal of the eggs. Both the statistical and modeling results supported the hypothesis that the effects of extreme river discharges on retention may regulate croaker recruitment by promoting high (low) recruitment during low (high) discharge periods. © 2011 Blackwell Publishing Ltd. |
| author |
Simionato, Claudia Gloria |
| author_facet |
Simionato, Claudia Gloria |
| author_sort |
Simionato, Claudia Gloria |
| title |
Climate-induced year-class fluctuations of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae) in the Río de la Plata estuary, Argentina-Uruguay |
| title_short |
Climate-induced year-class fluctuations of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae) in the Río de la Plata estuary, Argentina-Uruguay |
| title_full |
Climate-induced year-class fluctuations of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae) in the Río de la Plata estuary, Argentina-Uruguay |
| title_fullStr |
Climate-induced year-class fluctuations of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae) in the Río de la Plata estuary, Argentina-Uruguay |
| title_full_unstemmed |
Climate-induced year-class fluctuations of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae) in the Río de la Plata estuary, Argentina-Uruguay |
| title_sort |
climate-induced year-class fluctuations of whitemouth croaker micropogonias furnieri (pisces, sciaenidae) in the río de la plata estuary, argentina-uruguay |
| publishDate |
2012 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10546006_v21_n1_p58_Acha http://hdl.handle.net/20.500.12110/paper_10546006_v21_n1_p58_Acha |
| work_keys_str_mv |
AT simionatoclaudiagloria climateinducedyearclassfluctuationsofwhitemouthcroakermicropogoniasfurnieripiscessciaenidaeintheriodelaplataestuaryargentinauruguay |
| _version_ |
1768545748635353088 |