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Variability of Suitable Habitat of Western Winter-Spring Cohort for Neon Flying Squid in the Northwest Pacific under Anomalous Environments.

Yu W, Chen X, Yi Q, Chen Y, Zhang Y - PLoS ONE (2015)

Bottom Line: The AMM model was found to perform better than the GMM model.The La Niña events in 1998 tended to yield warm SST and favorable range of Chl-a concentration and SSHA, resulting in high-quality habitats for O. bartramii.This study might provide some potentially valuable insights into exploring the relationship between the underlying squid habitat and the inter-annual environmental change.

View Article: PubMed Central - PubMed

Affiliation: College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China; Collaborative Innovation Center for Distant-water Fisheries, Shanghai, 201306, China.

ABSTRACT
We developed a habitat suitability index (HSI) model to evaluate the variability of suitable habitat for neon flying squid (Ommastrephes bartramii) under anomalous environments in the Northwest Pacific Ocean. Commercial fisheries data from the Chinese squid-jigging vessels on the traditional fishing ground bounded by 35°-45°N and 150°-175°E from July to November during 1998-2009 were used for analyses, as well as the environmental variables including sea surface temperature (SST), chlorophyll-a (Chl-a) concentration, sea surface height anomaly (SSHA) and sea surface salinity (SSS). Two empirical HSI models (arithmetic mean model, AMM; geometric mean model, GMM) were established according to the frequency distribution of fishing efforts. The AMM model was found to perform better than the GMM model. The AMM-based HSI model was further validated by the fishery and environmental data in 2010. The predicted HSI values in 1998 (high catch), 2008 (average catch) and 2009 (low catch) indicated that the squid habitat quality was strongly associated with the ENSO-induced variability in the oceanic conditions on the fishing ground. The La Niña events in 1998 tended to yield warm SST and favorable range of Chl-a concentration and SSHA, resulting in high-quality habitats for O. bartramii. While the fishing ground in the El Niño year of 2009 experienced anomalous cool waters and unfavorable range of Chl-a concentration and SSHA, leading to relatively low-quality squid habitats. Our findings suggest that the La Niña event in 1998 tended to result in more favorable habitats for O. bartramii in the Northwest Pacific with the gravity centers of fishing efforts falling within the defined suitable habitat and yielding high squid catch; whereas the El Niño event in 2009 yielded less favorable habitat areas with the fishing effort distribution mismatching the suitable habitat and a dramatic decline of the catch of O. bartramii. This study might provide some potentially valuable insights into exploring the relationship between the underlying squid habitat and the inter-annual environmental change.

No MeSH data available.


Related in: MedlinePlus

Comparing the different habitat levels during 1998, 2008 and 2009.The percentage of (a) unfavorable habitat area; and (b) suitable habitat area accounting for the traditional fishing ground of Ommastrephes bartramii in the Northwest Pacific in 1998, 2008 and 2009, respectively.
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pone.0122997.g008: Comparing the different habitat levels during 1998, 2008 and 2009.The percentage of (a) unfavorable habitat area; and (b) suitable habitat area accounting for the traditional fishing ground of Ommastrephes bartramii in the Northwest Pacific in 1998, 2008 and 2009, respectively.

Mentions: The poor squid habitat areas and favorable habitat areas were evaluated under different anomalous environmental conditions. When the fishing ground of O. bartramii was affected by the La Niña event in 1998, the areas with HSI<0.2 accounted for 17.6% in July, 27.2% in August, 39.2% in September, 58.8% in October, and 40.8% in November of the total area of the traditional fishing ground (Fig 8a); the areas with HSI>0.6 covered approximately 18.0%, 14.8%, 16.0%, 5.6%, and 7.6% of the total fishing ground from July to November, respectively (Fig 8b). The average environmental condition in 2008 yielded 19.6%, 32.4%, 44.4%, 58.8% and 46.8% of the poor habitat areas on the fishing ground during July to November, respectively; while the favorable areas tended to be accounting for a high proportion of the fishing ground over the three years, the values ranged from 6.8% in November to 18.8% in August of the traditional fishing waters. Comparing with those in 1998 and 2008, a significant increase except in October could be seen in the unfavorable habitat areas in each month during 2009, probably as a result of the influence of the El Niño event. The monthly percentage in July to November reached up to 25.6%, 34.8%, 40.4%, 54.4% and 58.8%, respectively. Conversely, the suitable habitat for O. bartramii in 2009 experienced an obviously decline. The area with the HSI value>0.6 only covered 2.0% of the total fishing ground in October. The largest suitable areas occurred in September, making up 17.6% of the total fishing ground.


Variability of Suitable Habitat of Western Winter-Spring Cohort for Neon Flying Squid in the Northwest Pacific under Anomalous Environments.

Yu W, Chen X, Yi Q, Chen Y, Zhang Y - PLoS ONE (2015)

Comparing the different habitat levels during 1998, 2008 and 2009.The percentage of (a) unfavorable habitat area; and (b) suitable habitat area accounting for the traditional fishing ground of Ommastrephes bartramii in the Northwest Pacific in 1998, 2008 and 2009, respectively.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4414546&req=5

pone.0122997.g008: Comparing the different habitat levels during 1998, 2008 and 2009.The percentage of (a) unfavorable habitat area; and (b) suitable habitat area accounting for the traditional fishing ground of Ommastrephes bartramii in the Northwest Pacific in 1998, 2008 and 2009, respectively.
Mentions: The poor squid habitat areas and favorable habitat areas were evaluated under different anomalous environmental conditions. When the fishing ground of O. bartramii was affected by the La Niña event in 1998, the areas with HSI<0.2 accounted for 17.6% in July, 27.2% in August, 39.2% in September, 58.8% in October, and 40.8% in November of the total area of the traditional fishing ground (Fig 8a); the areas with HSI>0.6 covered approximately 18.0%, 14.8%, 16.0%, 5.6%, and 7.6% of the total fishing ground from July to November, respectively (Fig 8b). The average environmental condition in 2008 yielded 19.6%, 32.4%, 44.4%, 58.8% and 46.8% of the poor habitat areas on the fishing ground during July to November, respectively; while the favorable areas tended to be accounting for a high proportion of the fishing ground over the three years, the values ranged from 6.8% in November to 18.8% in August of the traditional fishing waters. Comparing with those in 1998 and 2008, a significant increase except in October could be seen in the unfavorable habitat areas in each month during 2009, probably as a result of the influence of the El Niño event. The monthly percentage in July to November reached up to 25.6%, 34.8%, 40.4%, 54.4% and 58.8%, respectively. Conversely, the suitable habitat for O. bartramii in 2009 experienced an obviously decline. The area with the HSI value>0.6 only covered 2.0% of the total fishing ground in October. The largest suitable areas occurred in September, making up 17.6% of the total fishing ground.

Bottom Line: The AMM model was found to perform better than the GMM model.The La Niña events in 1998 tended to yield warm SST and favorable range of Chl-a concentration and SSHA, resulting in high-quality habitats for O. bartramii.This study might provide some potentially valuable insights into exploring the relationship between the underlying squid habitat and the inter-annual environmental change.

View Article: PubMed Central - PubMed

Affiliation: College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China; Collaborative Innovation Center for Distant-water Fisheries, Shanghai, 201306, China.

ABSTRACT
We developed a habitat suitability index (HSI) model to evaluate the variability of suitable habitat for neon flying squid (Ommastrephes bartramii) under anomalous environments in the Northwest Pacific Ocean. Commercial fisheries data from the Chinese squid-jigging vessels on the traditional fishing ground bounded by 35°-45°N and 150°-175°E from July to November during 1998-2009 were used for analyses, as well as the environmental variables including sea surface temperature (SST), chlorophyll-a (Chl-a) concentration, sea surface height anomaly (SSHA) and sea surface salinity (SSS). Two empirical HSI models (arithmetic mean model, AMM; geometric mean model, GMM) were established according to the frequency distribution of fishing efforts. The AMM model was found to perform better than the GMM model. The AMM-based HSI model was further validated by the fishery and environmental data in 2010. The predicted HSI values in 1998 (high catch), 2008 (average catch) and 2009 (low catch) indicated that the squid habitat quality was strongly associated with the ENSO-induced variability in the oceanic conditions on the fishing ground. The La Niña events in 1998 tended to yield warm SST and favorable range of Chl-a concentration and SSHA, resulting in high-quality habitats for O. bartramii. While the fishing ground in the El Niño year of 2009 experienced anomalous cool waters and unfavorable range of Chl-a concentration and SSHA, leading to relatively low-quality squid habitats. Our findings suggest that the La Niña event in 1998 tended to result in more favorable habitats for O. bartramii in the Northwest Pacific with the gravity centers of fishing efforts falling within the defined suitable habitat and yielding high squid catch; whereas the El Niño event in 2009 yielded less favorable habitat areas with the fishing effort distribution mismatching the suitable habitat and a dramatic decline of the catch of O. bartramii. This study might provide some potentially valuable insights into exploring the relationship between the underlying squid habitat and the inter-annual environmental change.

No MeSH data available.


Related in: MedlinePlus