scholarly journals The Change Characteristics of Potential Habitat and Fishing Season for Neon Flying Squid in the Northwest Pacific Ocean under Future Climate Change Scenarios

2021 ◽  
Vol 13 (5) ◽  
pp. 450-462
Author(s):  
Caixia Gong ◽  
Xinjun Chen ◽  
Feng Gao ◽  
Wei Yu
Keyword(s):  
Climate Change ◽  
Future Climate Change ◽  
Northwest Pacific ◽  
Climate Change Scenarios ◽  
Northwest Pacific Ocean ◽  
Fishing Season ◽  
Potential Habitat ◽  
Change Characteristics ◽  
Neon Flying Squid ◽  
The Northwest Pacific Ocean

scholarly journals Stock assessment of the western winter-spring cohort of Ommastrephes bartramii in the Northwest Pacific Ocean using a Bayesian hierarchical DeLury model based on daily natural mortality during 2005-2015

2019 ◽  
Vol 83 (2) ◽  
pp. 155 ◽  
Author(s):  
Qi Ding ◽  
Jie Cao ◽  
Xinjun Chen
Keyword(s):  
Pacific Ocean ◽  
Environmental Conditions ◽  
Northwest Pacific ◽  
Natural Mortality ◽  
Ommastrephes Bartramii ◽  
Northwest Pacific Ocean ◽  
Bayesian Hierarchical ◽  
Stock Size ◽  
Neon Flying Squid ◽  
The Northwest Pacific Ocean

The purpose of this study was to evaluate the effect of the intensive commercial jigging fishery on the western winter-spring cohort of neon flying squid (Ommastrephes bartramii) in the Northwest Pacific Ocean and to estimate the exploitation status of this stock during the period 2005-2015. We applied a Bayesian hierarchical DeLury depletion model to the Chinese jigging fisheries data to estimate the stock abundance and catchability for each year, and sensitivity analysis on daily natural mortality (M) was conducted. The results indicated that M values had great impacts on the overall estimates of stock size. Initial annual population sizes varied from 66 to 662 million individuals with the M value of 0.003-0.01 per day during the study period. O. bartramii suffered from a certain degree of overexploitation in 2008. The proportional escapement values (M=0.003-0.01) were 8.94% to 19.82% in 2008, with an average of 13.74%, which may have led to a low abundance of O. bartramii and annual catch since 2009. As short-lived ecological opportunists, O. bartramii are extremely sensitive to changes in multi-scale environmental conditions, especially when anomalous environmental conditions occur, and significant between-year variations in the initial abundance resulted in O. bartramii suffering from a certain degree of overexploitation in 2010. Although the proportional escapement met the management target of 40% from 2011 to 2015, the stock size and annual catch still fluctuated at relatively low levels. Improved knowledge of the influences of environmental conditions on abundance of the western winter-spring cohort of neon flying squid can contribute to the sustainable management of this stock.

scholarly journals Predicting the Potential Habitat of Three Endangered Species of Carpinus genus under Climate Change and Human Activity

Forests ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1216
Author(s):  
Jiejie Sun ◽  
Lei Feng ◽  
Tongli Wang ◽  
Xiangni Tian ◽  
Xiao He ◽  
...  
Keyword(s):  
Climate Change ◽  
Endangered Species ◽  
Future Climate Change ◽  
Climate Change Scenarios ◽  
Potential Habitat ◽  
Human Footprint ◽  
Precipitation Seasonality ◽  
The Future ◽  
Potential Habitats ◽  
The Impact

The impact of climate change and human activities on endangered plants has been a serious concern in forest ecology. Some Carpinus plants have become extinct. Thus, we need to pay more attention to the Carpinus plants that are not yet extinct but are endangered. Here, we employed the species distribution model (SDM) considering different climate change scenarios and human footprint to test the potential habitat changes of three Carpinus species (C. oblongifolia, C. tientaiensis, and C. purpurinervis) in the future. Our results showed that the mean diurnal range of temperature (MDRT), isothermality, mean temperature of wettest quarter, and human footprint were the most influential factors determining the distribution of C. oblongifolia. Precipitation seasonality (coefficient of variation), MDRT, and precipitation of driest quarter were the most important climatic factors affecting C. tientaiensis. The minimum temperature of the coldest month was the most important factor in the distribution of C. purpurinervis. Our results also showed that the three species had different adaptability and habitat change trends under the future climate change scenarios, although they belong to the same genus. The potential habitats of C. oblongifolia would expand in the future, while the potential habitats of C. tientaiensis and C. purpurinervis would decrease for the same period. The predicted changes of these three endangered species on temporal and spatial patterns could provide a theoretical basis for their conservation strategies.

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