Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico
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Redalyc · Ciencias Marinas
Fin whales (Balaenoptera physalus) are observed year-round in the Ballenas Channel and Bahía de los Ángeles region, Gulf of California, where their main food item is the euphausiid Nyctiphanes simplex. This investigation was designed under the hypothesis that the spatial and temporal occurrence of w...
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| Publié dans: | Ciencias Marinas |
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Autónoma de Baja California
2015
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| _version_ | 1878325300154073088 |
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| author | Paloma Ladrón-de-Guevara |
| author_facet | Paloma Ladrón-de-Guevara |
| collection | Ciencias Marinas |
| container_title | Ciencias Marinas |
| contents | Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico Paloma Ladrón-de-Guevara Gisela Heckel Bertha E Lavaniegos Ciencias de la Tierra fin whale euphausiids Gulf of California Nyctiphanes simplex Balaenoptera physalus Fin whales ( Balaenoptera physalus ) are observed year-round in the B allenas Channel and Bahía de los Ángeles region, Gulf of California, where their main food item is the euphausiid Nyctiphanes simplex . This investigation was desi gned under the hypothesis that the spatial and temporal occurrence of whales and euphausi ids coincides. The aim was to establish the geographic, seasonal, and interannual changes in the abundance of the fin whale and its main prey in the region during 2003 and 2004. F our field trips were carried out per year. Surveys to search for whales and carry out horizontal surface t ows were conducted from small boats . Fin whales and euphausiids were mainly observed off the coast of Baja California and in the southern B allenas Channel. The ir abundance varied significantly from one season to another in both years. The highest rel ative abundance of whales occurre d in July (warm season), followed by June (cold–warm transition period) and March–April (cold season), and th e lowest in October (late warm season). Euphausiid abundance wa s significantly higher in June (cold–warm transition period), followed by July (warm season). There was n o direct correlation between week ly abundances of both species, probably because whale peak abundance occu rred four weeks later than eup hausiid peak abundance. Fin whal e relative abundance was signif icantly higher in 2004 than in 2003 (2.22 and 0.46 whales h –1 , respectively), but euphausiid abundance remained almost the s ame (geometric means 255 and 174 ind/1000 m 3 ). Even though there wa s no weekly correlati on between both spe cies, their geographic di stribution did overlap. 2015 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48039202004 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.2 Vol.41 |
| ctrlnum | oai:cienciasmarinas.com.mx:article/2497 10.7773/cm.v41i2.2497 |
| description | Fin whales (Balaenoptera physalus) are observed year-round in the Ballenas Channel and Bahía de los Ángeles region, Gulf of California, where their main food item is the euphausiid Nyctiphanes simplex. This investigation was designed under the hypothesis that the spatial and temporal occurrence of whales and euphausiids coincides. The aim was to establish the geographic, seasonal, and interannual changes in the abundance of the fin whale and its main prey in the region during 2003 and 2004. Four field trips were carried out per year. Surveys to search for whales and carry out horizontal surface tows were conducted from small boats. Fin whales and euphausiids were mainly observed off the coast of Baja California and in the southern Ballenas Channel. Their abundance varied significantly from one season to another in both years. The highest relative abundance of whales occurred in July (warm season), followed by June (cold–warm transition period) and March–April (cold season), and the lowest in October (late warm season). Euphausiid abundance was significantly higher in June (cold–warm transition period), followed by July (warm season). There was no direct correlation between weekly abundances of both species, probably because whale peak abundance occurred four weeks later than euphausiid peak abundance. Fin whale relative abundance was significantly higher in 2004 than in 2003 (2.22 and 0.46 whales h–1, respectively), but euphausiid abundance remained almost the same (geometric means 255 and 174 ind/1000 m3). Even though there was no weekly correlation between both species, their geographic distribution did overlap.
El rorcual común (Balaenoptera physalus) se observa durante todo el año en la región del canal de Ballenas y bahía de los Ángeles, donde su presa principal es el eufáusido Nyctiphanes simplex. Esta investigación se diseñó bajo la hipótesis de que coincide la distribución espacial y temporal de los rorcuales y los eufáusidos. El objetivo fue establecer las variaciones geográficas, estacionales e interanuales de la abundancia del rorcual común y su principal presa en esta región en 2003 y 2004. Se llevaron a cabo cuatro salidas de campo al año. Los recorridos para buscar ballenas y hacer arrastres superficiales se realizaron en embarcaciones menores. Los rorcuales comunes y los eufáusidos se observaron principalmente frente a la costa de Baja California y al sur del canal de Ballenas. La abundancia de rorcuales y eufáusidos varió estacionalmente en forma significativa en ambos años. La mayor abundancia relativa de rorcuales ocurrió en julio (temporada cálida), seguida de junio (periodo de transición frío a cálido) y marzo–abril (temporada fría), y la más baja ocurrió en octubre (temporada cálida tardía). La abundancia de eufáusidos fue significativamente más alta en junio (periodo de transición frío a cálido), seguida de julio (temporada cálida). No hubo una correlación directa en la abundancia semanal de ambas especies, probablemente porque el máximo de abundancia de ballenas ocurrió cuatro semanas después del máximo de abundancia de eufáusidos. La abundancia relativa del rorcual común fue significativamente mayor en 2004 que en 2003 (2.22 y 0.46 ballenas h–1, respectivamente) pero la abundancia de eufáusidos fue casi la misma (medias geométricas 255 y 174 ind/1000 m3). Aunque no hubo una correlación entre la abundancia semanal de ambas especies, sí se encontró que coincidieron espacialmente. |
| format | Artículo científico |
| id | redalyc_48039202004 |
| institution | Redalyc Ciencias Marinas |
| language | en |
| publishDate | 2015 |
| publisher | Universidad Autónoma de Baja California |
| spelling | Spatial and temporal occurrence of fin whales (Balaenoptera physalus) and euphausiids (Nyctiphanes simplex) in the Ballenas Channel, Gulf of California, Mexico Variación espaciotemporal de la distribución de rorcuales comunes (Balaenoptera physalus) y eufáusidos (Nyctiphanes simplex) en el canal de Ballenas, golfo de California, México Ladrón-de-Guevara, Paloma Heckel, Gisela Lavaniegos, Bertha E Fin whales (Balaenoptera physalus) are observed year-round in the Ballenas Channel and Bahía de los Ángeles region, Gulf of California, where their main food item is the euphausiid Nyctiphanes simplex. This investigation was designed under the hypothesis that the spatial and temporal occurrence of whales and euphausiids coincides. The aim was to establish the geographic, seasonal, and interannual changes in the abundance of the fin whale and its main prey in the region during 2003 and 2004. Four field trips were carried out per year. Surveys to search for whales and carry out horizontal surface tows were conducted from small boats. Fin whales and euphausiids were mainly observed off the coast of Baja California and in the southern Ballenas Channel. Their abundance varied significantly from one season to another in both years. The highest relative abundance of whales occurred in July (warm season), followed by June (cold–warm transition period) and March–April (cold season), and the lowest in October (late warm season). Euphausiid abundance was significantly higher in June (cold–warm transition period), followed by July (warm season). There was no direct correlation between weekly abundances of both species, probably because whale peak abundance occurred four weeks later than euphausiid peak abundance. Fin whale relative abundance was significantly higher in 2004 than in 2003 (2.22 and 0.46 whales h–1, respectively), but euphausiid abundance remained almost the same (geometric means 255 and 174 ind/1000 m3). Even though there was no weekly correlation between both species, their geographic distribution did overlap. El rorcual común (Balaenoptera physalus) se observa durante todo el año en la región del canal de Ballenas y bahía de los Ángeles, donde su presa principal es el eufáusido Nyctiphanes simplex. Esta investigación se diseñó bajo la hipótesis de que coincide la distribución espacial y temporal de los rorcuales y los eufáusidos. El objetivo fue establecer las variaciones geográficas, estacionales e interanuales de la abundancia del rorcual común y su principal presa en esta región en 2003 y 2004. Se llevaron a cabo cuatro salidas de campo al año. Los recorridos para buscar ballenas y hacer arrastres superficiales se realizaron en embarcaciones menores. Los rorcuales comunes y los eufáusidos se observaron principalmente frente a la costa de Baja California y al sur del canal de Ballenas. La abundancia de rorcuales y eufáusidos varió estacionalmente en forma significativa en ambos años. La mayor abundancia relativa de rorcuales ocurrió en julio (temporada cálida), seguida de junio (periodo de transición frío a cálido) y marzo–abril (temporada fría), y la más baja ocurrió en octubre (temporada cálida tardía). La abundancia de eufáusidos fue significativamente más alta en junio (periodo de transición frío a cálido), seguida de julio (temporada cálida). No hubo una correlación directa en la abundancia semanal de ambas especies, probablemente porque el máximo de abundancia de ballenas ocurrió cuatro semanas después del máximo de abundancia de eufáusidos. La abundancia relativa del rorcual común fue significativamente mayor en 2004 que en 2003 (2.22 y 0.46 ballenas h–1, respectivamente) pero la abundancia de eufáusidos fue casi la misma (medias geométricas 255 y 174 ind/1000 m3). Aunque no hubo una correlación entre la abundancia semanal de ambas especies, sí se encontró que coincidieron espacialmente. Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas 2015-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/2497 10.7773/cm.v41i2.2497 Ciencias Marinas; Vol. 41 No. 2 (2015); 125-142 Ciencias Marinas; Vol. 41 Núm. 2 (2015); 125-142 2395-9053 0185-3880 eng https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/2497/1555 Copyright (c) 2015 Ciencias Marinas ['Redalyc'] redalyc_48039202004 Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico ['Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico', 'Paloma Ladrón-de-Guevara', 'Ciencias de la Tierra', 'fin whale', 'euphausiids', 'Gulf of California', 'Nyctiphanes simplex', 'Balaenoptera physalus', 'Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico Paloma Ladrón-de-Guevara Gisela Heckel Bertha E Lavaniegos Ciencias de la Tierra fin whale euphausiids Gulf of California Nyctiphanes simplex Balaenoptera physalus Fin whales ( Balaenoptera physalus ) are observed year-round in the B allenas Channel and Bahía de los Ángeles region, Gulf of California, where their main food item is the euphausiid Nyctiphanes simplex . This investigation was desi gned under the hypothesis that the spatial and temporal occurrence of whales and euphausi ids coincides. The aim was to establish the geographic, seasonal, and interannual changes in the abundance of the fin whale and its main prey in the region during 2003 and 2004. F our field trips were carried out per year. Surveys to search for whales and carry out horizontal surface t ows were conducted from small boats . Fin whales and euphausiids were mainly observed off the coast of Baja California and in the southern B allenas Channel. The ir abundance varied significantly from one season to another in both years. The highest rel ative abundance of whales occurre d in July (warm season), followed by June (cold–warm transition period) and March–April (cold season), and th e lowest in October (late warm season). Euphausiid abundance wa s significantly higher in June (cold–warm transition period), followed by July (warm season). There was n o direct correlation between week ly abundances of both species, probably because whale peak abundance occu rred four weeks later than eup hausiid peak abundance. Fin whal e relative abundance was signif icantly higher in 2004 than in 2003 (2.22 and 0.46 whales h –1 , respectively), but euphausiid abundance remained almost the s ame (geometric means 255 and 174 ind/1000 m 3 ). Even though there wa s no weekly correlati on between both spe cies, their geographic di stribution did overlap. 2015 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48039202004 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.2 Vol.41'] ['Paloma Ladrón-de-Guevara'] ['Paloma Ladrón-de-Guevara'] ['Artículo científico'] ['2015'] ['Universidad Autónoma de Baja California'] ['en'] ['Ciencias de la Tierra', 'fin whale', 'euphausiids', 'Gulf of California', 'Nyctiphanes simplex', 'Balaenoptera physalus'] ['https://www.redalyc.org/articulo.oa?id=48039202004'] ['Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico Paloma Ladrón-de-Guevara Gisela Heckel Bertha E Lavaniegos Ciencias de la Tierra fin whale euphausiids Gulf of California Nyctiphanes simplex Balaenoptera physalus Fin whales ( Balaenoptera physalus ) are observed year-round in the B allenas Channel and Bahía de los Ángeles region, Gulf of California, where their main food item is the euphausiid Nyctiphanes simplex . This investigation was desi gned under the hypothesis that the spatial and temporal occurrence of whales and euphausi ids coincides. The aim was to establish the geographic, seasonal, and interannual changes in the abundance of the fin whale and its main prey in the region during 2003 and 2004. F our field trips were carried out per year. Surveys to search for whales and carry out horizontal surface t ows were conducted from small boats . Fin whales and euphausiids were mainly observed off the coast of Baja California and in the southern B allenas Channel. The ir abundance varied significantly from one season to another in both years. The highest rel ative abundance of whales occurre d in July (warm season), followed by June (cold–warm transition period) and March–April (cold season), and th e lowest in October (late warm season). Euphausiid abundance wa s significantly higher in June (cold–warm transition period), followed by July (warm season). There was n o direct correlation between week ly abundances of both species, probably because whale peak abundance occu rred four weeks later than eup hausiid peak abundance. Fin whal e relative abundance was signif icantly higher in 2004 than in 2003 (2.22 and 0.46 whales h –1 , respectively), but euphausiid abundance remained almost the s ame (geometric means 255 and 174 ind/1000 m 3 ). Even though there wa s no weekly correlati on between both spe cies, their geographic di stribution did overlap. 2015 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48039202004 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.2 Vol.41'] |
| spellingShingle | Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico Paloma Ladrón-de-Guevara Ciencias de la Tierra fin whale euphausiids Gulf of California Nyctiphanes simplex Balaenoptera physalus Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico Paloma Ladrón-de-Guevara Gisela Heckel Bertha E Lavaniegos Ciencias de la Tierra fin whale euphausiids Gulf of California Nyctiphanes simplex Balaenoptera physalus Fin whales ( Balaenoptera physalus ) are observed year-round in the B allenas Channel and Bahía de los Ángeles region, Gulf of California, where their main food item is the euphausiid Nyctiphanes simplex . This investigation was desi gned under the hypothesis that the spatial and temporal occurrence of whales and euphausi ids coincides. The aim was to establish the geographic, seasonal, and interannual changes in the abundance of the fin whale and its main prey in the region during 2003 and 2004. F our field trips were carried out per year. Surveys to search for whales and carry out horizontal surface t ows were conducted from small boats . Fin whales and euphausiids were mainly observed off the coast of Baja California and in the southern B allenas Channel. The ir abundance varied significantly from one season to another in both years. The highest rel ative abundance of whales occurre d in July (warm season), followed by June (cold–warm transition period) and March–April (cold season), and th e lowest in October (late warm season). Euphausiid abundance wa s significantly higher in June (cold–warm transition period), followed by July (warm season). There was n o direct correlation between week ly abundances of both species, probably because whale peak abundance occu rred four weeks later than eup hausiid peak abundance. Fin whal e relative abundance was signif icantly higher in 2004 than in 2003 (2.22 and 0.46 whales h –1 , respectively), but euphausiid abundance remained almost the s ame (geometric means 255 and 174 ind/1000 m 3 ). Even though there wa s no weekly correlati on between both spe cies, their geographic di stribution did overlap. 2015 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48039202004 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.2 Vol.41 |
| title | Spatial and temporal occurrence of fin whales ( Balaenoptera physalus ) and euphausiids ( Nyctiphanes simplex ) in the Ballenas Channel, Gulf of California, Mexico |
| title_alt | Variación espaciotemporal de la distribución de rorcuales comunes (Balaenoptera physalus) y eufáusidos (Nyctiphanes simplex) en el canal de Ballenas, golfo de California, México Spatial and temporal occurrence of fin whales (Balaenoptera physalus) and euphausiids (Nyctiphanes simplex) in the Ballenas Channel, Gulf of California, Mexico |
| topic | Ciencias de la Tierra fin whale euphausiids Gulf of California Nyctiphanes simplex Balaenoptera physalus |
| url | https://www.redalyc.org/articulo.oa?id=48039202004 https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/2497 |