Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach
Monte Hermoso (SW Atlantic, Argentina) is a coastal ecosystem highly modulated by wind forcing. Offshore winds have historically played a leading role in the tourist influx as they are associated with the occurrence of the endemic stinging medusa Olindias sambaquiensis. This species is closely rel...
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| Format: | Article |
| Language: | English |
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Universidade Federal do Rio de Janeiro
2017-09-01
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| Series: | Anuário do Instituto de Geociências |
| Subjects: | |
| Online Access: | http://www.anuario.igeo.ufrj.br/2017_3/2017_3_303_315.pdf |
| _version_ | 1828074998886039552 |
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| author | Andrea Soledad Brende María Sofía Dutto María Clara Menéndez María Andrea Huamantinco Cisneros María Cintia Piccolo |
| author_facet | Andrea Soledad Brende María Sofía Dutto María Clara Menéndez María Andrea Huamantinco Cisneros María Cintia Piccolo |
| author_sort | Andrea Soledad Brende |
| collection | DOAJ |
| description | Monte Hermoso (SW Atlantic, Argentina) is a coastal ecosystem highly modulated by wind forcing. Offshore winds have
historically played a leading role in the tourist influx as they are associated with the occurrence of the endemic stinging medusa Olindias
sambaquiensis. This species is closely related to warm summers but it could be favored by low temperatures in previous winters.
Since summer 2013, a change in the wind pattern was locally perceived coincidently with the absence of the medusa in coastal waters.
This work aimed at analyzing if wind pattern and sea surface temperature (SST) showed a measurable change along 2008-2015 and
evaluating if this change can be associated to the observed variations in the occurrence pattern of O. sambaquiensis. Winds and SST
data were analyzed in periods of high (2008-2012) and low (2013-2015) medusae occurrence, based on media and own observations.
A significant change in the wind pattern in Monte Hermoso was detected. Wind speed decreased from 6.3 m s-1 in 2008 to 2.4 m s-1 in
2015 and calms and light winds increased by more than 44.2 and 7.5 %, respectively. This change implied an impediment of coastal
upwelling, which is the physical process by which medusae reach the coast, and is associated with persistent (10 h or more) WNW
to ENE winds blowing at ≥ 3.3 m s-1. Accordingly, in summer 2008 (period of high medusae occurrence), 45 coastal upwelling-days
were detected in contrast to only 8 days in summer 2015 (period of absence of medusae). Also, positive SST anomalies were found
over the 8-yr period, suggesting an increasing trend of 0.4 °C. Higher temperatures than normal during recent winters probably affect
negatively the polyp reproduction. Our results demonstrate an environmental change in the ecosystem of Monte Hermoso and may
explain, in part, the low occurrence of O. sambaquiensis in recent summers. The knowledge of the factors that regulate the occurrence
of O. sambaquiensis is fundamental for developing a coastal management plan and/or for determining the first adaptation strategies. |
| first_indexed | 2024-04-11T01:51:34Z |
| format | Article |
| id | doaj.art-03e7a6cd4f2349e5961313eee0ded1a3 |
| institution | Directory Open Access Journal |
| issn | 0101-9759 1982-3908 |
| language | English |
| last_indexed | 2024-04-11T01:51:34Z |
| publishDate | 2017-09-01 |
| publisher | Universidade Federal do Rio de Janeiro |
| record_format | Article |
| series | Anuário do Instituto de Geociências |
| spelling | doaj.art-03e7a6cd4f2349e5961313eee0ded1a32023-01-03T06:08:06ZengUniversidade Federal do Rio de JaneiroAnuário do Instituto de Geociências0101-97591982-39082017-09-01403303315http://dx.doi.org/10.11137/2017_3_303_315Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic BeachAndrea Soledad Brende0María Sofía Dutto1María Clara Menéndez2 María Andrea Huamantinco Cisneros3María Cintia Piccolo4Universidad Nacional del SurUniversidad Nacional del SurUniversidad Nacional del SurUniversidad Nacional del SurUniversidad Nacional del SurMonte Hermoso (SW Atlantic, Argentina) is a coastal ecosystem highly modulated by wind forcing. Offshore winds have historically played a leading role in the tourist influx as they are associated with the occurrence of the endemic stinging medusa Olindias sambaquiensis. This species is closely related to warm summers but it could be favored by low temperatures in previous winters. Since summer 2013, a change in the wind pattern was locally perceived coincidently with the absence of the medusa in coastal waters. This work aimed at analyzing if wind pattern and sea surface temperature (SST) showed a measurable change along 2008-2015 and evaluating if this change can be associated to the observed variations in the occurrence pattern of O. sambaquiensis. Winds and SST data were analyzed in periods of high (2008-2012) and low (2013-2015) medusae occurrence, based on media and own observations. A significant change in the wind pattern in Monte Hermoso was detected. Wind speed decreased from 6.3 m s-1 in 2008 to 2.4 m s-1 in 2015 and calms and light winds increased by more than 44.2 and 7.5 %, respectively. This change implied an impediment of coastal upwelling, which is the physical process by which medusae reach the coast, and is associated with persistent (10 h or more) WNW to ENE winds blowing at ≥ 3.3 m s-1. Accordingly, in summer 2008 (period of high medusae occurrence), 45 coastal upwelling-days were detected in contrast to only 8 days in summer 2015 (period of absence of medusae). Also, positive SST anomalies were found over the 8-yr period, suggesting an increasing trend of 0.4 °C. Higher temperatures than normal during recent winters probably affect negatively the polyp reproduction. Our results demonstrate an environmental change in the ecosystem of Monte Hermoso and may explain, in part, the low occurrence of O. sambaquiensis in recent summers. The knowledge of the factors that regulate the occurrence of O. sambaquiensis is fundamental for developing a coastal management plan and/or for determining the first adaptation strategies.http://www.anuario.igeo.ufrj.br/2017_3/2017_3_303_315.pdfOffshore winds;Sea Surface Temperature (SST) anomalies;Coastal ecosystem;Olindias sambaquiensis;Southwestern Atlantic Ocean |
| spellingShingle | Andrea Soledad Brende María Sofía Dutto María Clara Menéndez María Andrea Huamantinco Cisneros María Cintia Piccolo Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach Anuário do Instituto de Geociências Offshore winds; Sea Surface Temperature (SST) anomalies; Coastal ecosystem; Olindias sambaquiensis; Southwestern Atlantic Ocean |
| title | Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach |
| title_full | Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach |
| title_fullStr | Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach |
| title_full_unstemmed | Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach |
| title_short | Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach |
| title_sort | wind pattern change along a period of coastal occurrence variation of a stinging medusa on a sw atlantic beach |
| topic | Offshore winds; Sea Surface Temperature (SST) anomalies; Coastal ecosystem; Olindias sambaquiensis; Southwestern Atlantic Ocean |
| url | http://www.anuario.igeo.ufrj.br/2017_3/2017_3_303_315.pdf |
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