Population dynamics of the squids Dosidicus gigas (Oegopsida: Ommastrephidae) and Doryteuthis gahi (Myopsida: Loliginidae) in northern Peru

Christian M. Ibáñez, Juan Argüelles, Carmen Yamashiro, Roger D. Sepúlveda, M. Cecilia Pardo-Gandarillas, Friedemann Keyl

Resultado de la investigación: Article

3 Citas (Scopus)

Resumen

Pelagic squids of continental shelf ecosystems mostly include oceanic and migratory species of the family Ommastrephidae and neritic species of the family Loliginidae. These two families have contrasting life history strategies; ommastrephids spawn in the open ocean and are thought to have a high dispersal potential, while loliginids spawn on the bottom and are likely to have a low dispersal potential. Consequently, these squid species should display different patterns in their population dynamics, which can be inferred through commercial catches. To study the population dynamics of the Ommastrephidae and the Loliginidae families, monthly time series catches of Dosidicus gigas and Doryteuthis gahi were used. These artisanal fishery catches were made in northern Peru from 1999 to 2010. They were standardized to construct autocorrelation functions so that the relationship between catch dynamics and short-term environmental change (thermal anomalies of sea surface temperature were used as a proxy) could be studied. The results revealed that increases in catches of D. gigas and D. gahi are not related to thermal anomalies, but rather a pattern of drastic fluctuations in D. gahi catch sizes are seen. In, both species, temporal relationships indicate that the annual growth rate and changes in abundance can modelled as a function of the catch density observed in previous years. We propose that these population differences result from the contrasting life history strategies and differential habitat use of these two squid species.

Idioma originalEnglish
Páginas (desde-hasta)151-158
Número de páginas8
PublicaciónFisheries Research
Volumen173
DOI
EstadoPublished - 1 ene 2016

Huella dactilar

Loliginidae
Ommastrephidae
Dosidicus gigas
squid
Peru
population dynamics
artisanal fishing
life history
temperature anomaly
heat
autocorrelation
artisanal fishery
migratory species
surface temperature
time series analysis
oceans
open ocean
habitat use
continental shelf
environmental change

ASJC Scopus subject areas

  • Aquatic Science

Citar esto

Ibáñez, Christian M. ; Argüelles, Juan ; Yamashiro, Carmen ; Sepúlveda, Roger D. ; Pardo-Gandarillas, M. Cecilia ; Keyl, Friedemann. / Population dynamics of the squids Dosidicus gigas (Oegopsida : Ommastrephidae) and Doryteuthis gahi (Myopsida: Loliginidae) in northern Peru. En: Fisheries Research. 2016 ; Vol. 173. pp. 151-158.
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title = "Population dynamics of the squids Dosidicus gigas (Oegopsida: Ommastrephidae) and Doryteuthis gahi (Myopsida: Loliginidae) in northern Peru",
abstract = "Pelagic squids of continental shelf ecosystems mostly include oceanic and migratory species of the family Ommastrephidae and neritic species of the family Loliginidae. These two families have contrasting life history strategies; ommastrephids spawn in the open ocean and are thought to have a high dispersal potential, while loliginids spawn on the bottom and are likely to have a low dispersal potential. Consequently, these squid species should display different patterns in their population dynamics, which can be inferred through commercial catches. To study the population dynamics of the Ommastrephidae and the Loliginidae families, monthly time series catches of Dosidicus gigas and Doryteuthis gahi were used. These artisanal fishery catches were made in northern Peru from 1999 to 2010. They were standardized to construct autocorrelation functions so that the relationship between catch dynamics and short-term environmental change (thermal anomalies of sea surface temperature were used as a proxy) could be studied. The results revealed that increases in catches of D. gigas and D. gahi are not related to thermal anomalies, but rather a pattern of drastic fluctuations in D. gahi catch sizes are seen. In, both species, temporal relationships indicate that the annual growth rate and changes in abundance can modelled as a function of the catch density observed in previous years. We propose that these population differences result from the contrasting life history strategies and differential habitat use of these two squid species.",
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Population dynamics of the squids Dosidicus gigas (Oegopsida : Ommastrephidae) and Doryteuthis gahi (Myopsida: Loliginidae) in northern Peru. / Ibáñez, Christian M.; Argüelles, Juan; Yamashiro, Carmen; Sepúlveda, Roger D.; Pardo-Gandarillas, M. Cecilia; Keyl, Friedemann.

En: Fisheries Research, Vol. 173, 01.01.2016, p. 151-158.

Resultado de la investigación: Article

TY - JOUR

T1 - Population dynamics of the squids Dosidicus gigas (Oegopsida

T2 - Ommastrephidae) and Doryteuthis gahi (Myopsida: Loliginidae) in northern Peru

AU - Ibáñez, Christian M.

AU - Argüelles, Juan

AU - Yamashiro, Carmen

AU - Sepúlveda, Roger D.

AU - Pardo-Gandarillas, M. Cecilia

AU - Keyl, Friedemann

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Pelagic squids of continental shelf ecosystems mostly include oceanic and migratory species of the family Ommastrephidae and neritic species of the family Loliginidae. These two families have contrasting life history strategies; ommastrephids spawn in the open ocean and are thought to have a high dispersal potential, while loliginids spawn on the bottom and are likely to have a low dispersal potential. Consequently, these squid species should display different patterns in their population dynamics, which can be inferred through commercial catches. To study the population dynamics of the Ommastrephidae and the Loliginidae families, monthly time series catches of Dosidicus gigas and Doryteuthis gahi were used. These artisanal fishery catches were made in northern Peru from 1999 to 2010. They were standardized to construct autocorrelation functions so that the relationship between catch dynamics and short-term environmental change (thermal anomalies of sea surface temperature were used as a proxy) could be studied. The results revealed that increases in catches of D. gigas and D. gahi are not related to thermal anomalies, but rather a pattern of drastic fluctuations in D. gahi catch sizes are seen. In, both species, temporal relationships indicate that the annual growth rate and changes in abundance can modelled as a function of the catch density observed in previous years. We propose that these population differences result from the contrasting life history strategies and differential habitat use of these two squid species.

AB - Pelagic squids of continental shelf ecosystems mostly include oceanic and migratory species of the family Ommastrephidae and neritic species of the family Loliginidae. These two families have contrasting life history strategies; ommastrephids spawn in the open ocean and are thought to have a high dispersal potential, while loliginids spawn on the bottom and are likely to have a low dispersal potential. Consequently, these squid species should display different patterns in their population dynamics, which can be inferred through commercial catches. To study the population dynamics of the Ommastrephidae and the Loliginidae families, monthly time series catches of Dosidicus gigas and Doryteuthis gahi were used. These artisanal fishery catches were made in northern Peru from 1999 to 2010. They were standardized to construct autocorrelation functions so that the relationship between catch dynamics and short-term environmental change (thermal anomalies of sea surface temperature were used as a proxy) could be studied. The results revealed that increases in catches of D. gigas and D. gahi are not related to thermal anomalies, but rather a pattern of drastic fluctuations in D. gahi catch sizes are seen. In, both species, temporal relationships indicate that the annual growth rate and changes in abundance can modelled as a function of the catch density observed in previous years. We propose that these population differences result from the contrasting life history strategies and differential habitat use of these two squid species.

KW - Population dynamics

KW - Squid

KW - Thermal anomalies

KW - Time series

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U2 - 10.1016/j.fishres.2015.06.014

DO - 10.1016/j.fishres.2015.06.014

M3 - Article

AN - SCOPUS:84954402073

VL - 173

SP - 151

EP - 158

JO - Fisheries Research

JF - Fisheries Research

SN - 0165-7836

ER -