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Ko CY, Lee YC, Wang YC, Hsu HH, Chow CH, Chen RG, Liu TH, Chen CS, Chiu TS, Chiang DH, Wu RF, Tseng WL. Modulations of ocean-atmosphere interactions on squid abundance over Southwest Atlantic. Environ Res 2024; 250:118444. [PMID: 38360168 DOI: 10.1016/j.envres.2024.118444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 02/03/2024] [Accepted: 02/06/2024] [Indexed: 02/17/2024]
Abstract
Anthropogenic shifts in seas are reshaping fishing trends, with significant implications for aquatic food sources throughout this century. Examining a 21-year abundance dataset of Argentine shortfin squids Illex argentinus paired with a regional oceanic analysis, we noted strong correlations between squid annual abundance and sea surface temperature (SST) in January and February and eddy kinetic energy (EKE) from March to May in the Southwest Atlantic. A deeper analysis revealed combined ocean-atmosphere interactions, pinpointed as the primary mode in a rotated empirical orthogonal function analysis of SST. This pattern produced colder SST and amplified EKE in the surrounding seas, factors crucial for the unique life stages of squids. Future projections from the CMIP6 archive indicated that this ocean-atmosphere pattern, referred to as the Atlantic symmetric pattern, would persist in its cold SST phase, promoting increased squid abundance. However, rising SSTs due to global warming might counteract the abundance gains. Our findings uncover a previously unrecognized link between squids and specific environmental conditions governed by broader ocean-atmosphere interactions in the Southwest Atlantic. Integrating these insights with seasonal and decadal projections can offer invaluable information to stakeholders in squid fisheries and marine conservation under a changing climate.
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Affiliation(s)
- Chia-Ying Ko
- Institute of Fisheries Science, National Taiwan University, Taiwan; Biodiversity Research Center, Institute of Ecology and Evolutionary Biology, Department of Life Science, and Master's Program in Biodiversity, National Taiwan University, Taiwan; Ocean Center, National Taiwan University, Taiwan.
| | - Yu-Chi Lee
- Research Center for Environmental Changes, Academia Sinica, Taiwan; Department of Earth and Planetary Sciences, University of California, Riverside, USA.
| | - Yi-Chi Wang
- Research Center for Environmental Changes, Academia Sinica, Taiwan.
| | - Huang-Hsiung Hsu
- Research Center for Environmental Changes, Academia Sinica, Taiwan.
| | - Chun Hoe Chow
- Department of Marine Environmental Informatics, National Taiwan Ocean University, Taiwan.
| | - Ruei-Gu Chen
- Fisheries Research Institute, Ministry of Agriculture, Taiwan.
| | - Tsung-Han Liu
- Institute of Fisheries Science, National Taiwan University, Taiwan.
| | - Chih-Shin Chen
- Institute of Marine Affairs and Resource Management, National Taiwan Ocean University, Taiwan.
| | - Tai-Sheng Chiu
- Biodiversity Research Center, Institute of Ecology and Evolutionary Biology, Department of Life Science, and Master's Program in Biodiversity, National Taiwan University, Taiwan.
| | - Don-Hsieh Chiang
- Overseas Fisheries Development Council of the Republic of China, Taiwan.
| | - Ren-Fen Wu
- Overseas Fisheries Development Council of the Republic of China, Taiwan.
| | - Wan-Ling Tseng
- Ocean Center, National Taiwan University, Taiwan; International Degree Program in Climate Change and Sustainable Development, National Taiwan University, Taiwan.
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Chiang DH, Wei JW. Effects of calcium antagonists on (Na+ + K+)-ATPase, Mg2+-ATPase and Ca2+-ATPase activities of rat cortical synaptosomes. Gen Pharmacol 1987; 18:563-7. [PMID: 2820836 DOI: 10.1016/0306-3623(87)90082-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
1. The effects of 11 calcium antagonists on (Na+ + K+)-ATPase, Mg2+-ATPase and Ca2+-ATPase activities of rat cortical synaptosomes were studied. 2. All the calcium antagonists studied had inhibitory effects on ouabain-sensitive (Na+ + K+)-ATPase, Mg2+-ATPase and Ca2+-ATPase activities in synaptosomes at high concentrations (10 or 100 microM). 3. Calcium antagonists such as trifluoperazine, flunarizine and cinnarizine had inhibitory effects on Ca2+-ATPase activity at low concentrations (1-10 microM). 4. Trifluoperazine and La3+ had inhibitory effects on Mg2+-ATPase activity at low concentration (1 microM). 5. Our results suggest that most of the calcium antagonists studied have little effects on neuronal (Na+ + K+)-ATPase, Mg2+-ATPase and Ca2+-ATPase activities at therapeutic dose ranges (1 microM or lower).
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Affiliation(s)
- D H Chiang
- Institute of Neurosciences, National Yang-Ming Medical College, Taipei, Taiwan, Republic of China
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Abstract
A series of calcium antagonists were used to study their blocking effect on high potassium-induced calcium uptake into rat cortical synaptosomes; these antagonists were classified into five groups: dihydropyridine group (i.e. nifedipine and nitrendipine), benzothiazepine group (i.e. diltiazem), phenylalkylamine group (i.e. verapamil and D600), phenothiazine group (i.e. trifluoperazine) and diphenylpiperazine group (i.e. flunarizine and cinnarizine). Voltage-dependent 45Ca2+-uptake into this fraction was measured after 20 sec KCl-induced depolarization. The ID30 values of the above-mentioned antagonists affecting 45Ca2+-uptake were calculated to be nitrendipine (80 microM), nifedipine (100 microM), verapamil (50 microM), D600 (15 microM), diltiazem (70 microM), trifluoperazine (7 microM), cinnarizine (1.2 microM) and flunarizine (0.7 microM). Our results reveal that in rat brain synaptosomal fractions, calcium influx via the voltage-gated calcium channel appears to be more sensitive to diphenylpiperazine and phenothiazine groups; whereas, phenylalkylamine, benzothiazepine and dihydropyridine groups were relatively insensitive. This contrasts with the well known data obtained from vascular smooth muscle, in which the dihydropyridine group is the most sensitive of all the groups studied. Our results suggest that calcium channels in neuronal tissue are most likely different from those in non-neuronal tissue.
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Abstract
Rat cortical synaptosomal fraction was used to study whether there is a direct link between [3H]nitrendipine binding and KCl-induced calcium uptake. [3H]Nitrendipine exhibited reversible and saturable binding to this preparation. The equilibrium dissociation constant Kd was 0.6 nM and the maximal binding capacity, Bmax, was 120 fmol/mg of protein. The binding could be displaced by certain calcium channel antagonists, the potency of which was in the order: nitrendipine greater than nifedipine greater than D600 greater than verapamil greater than flunarizine. Voltage-dependent 45Ca2+-uptake into this fraction was measured after 20 sec KCl-induced depolarization. Nitrendipine at high concentration (10 microM) had little effect on 45Ca2+-uptake into brain synaptosomes. The order of the above-mentioned calcium antagonists affecting 45Ca2+-uptake was flunarizine greater than D600 greater than verapamil greater than nifedipine greater than nitrendipine. Our results suggest that high-affinity binding of [3H]nitrendipine is not directly linked to voltage-dependent calcium uptake in brain.
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