RESUMEN

Background: Sciaenidae is one of the most important coastal fisheries in Taiwan, both in production and economic value. It is also significant as the main targetted diet of Chinese white dolphins, Sousachinensis, especially for the genus Johnius, such as J.taiwanensis, J.belangerii and J.distinctus, which is primarily found in central-western Taiwan coastal waters. Despite an abundance of Johnius species occurrences reported in the Global Biodiversity Information Facility (GBIF) and the Taiwan Biodiversity Information Facility (TaiBIF) data portals (Mozambique, Australia, Taiwan, Korea, India, Indonesia, South Africa, Pakistan, Vietnam and China), there are no specific datasets that properly document the regional distribution of this genus, especially in Taiwanese waters. Thus, this paper describes a dataset of genus Johnius occurrences in waters on the central-western coast of Taiwan. The data collection for the present study was conducted from 2009 until 2020 and comprised 62 sampling events and 133 occurrence records. All fish specimens were collected by trawling in Miaoli, Changhwa and Yunlin Counties, Taiwan and brought back to the lab for identification, individual number count and body weight measurement. These processing data have been integrated and established in the Taiwan Fish Database and published in GBIF. This dataset contains six Johnius species and 2,566 specimens, making it comprehensive Johnius fish fauna and spatial distributional data on the coastal habitat in central-western Taiwanese waters. New information: This dataset contains 133 occurrence records of Johnius species (Sciaenidae) with 2,566 specimens, making it the most extensive public dataset of Johnius distribution records in Taiwan. The publication of this dataset through the TaiBIF and GBIF dataset platforms demonstrated that the number of Johnius spatial and temporal records in Taiwan waters is influenced by the topographical structure of the Changyun Rise (CYR) in combination with the cold current of the China Coastal currents and bound with the warm currents of the Kuroshio and the South China Sea on the central-western coast of Taiwan. The data serve as the foundation for understanding the biogeography and Johnius species ecology in Taiwan's coastal waters, which present a 2°C water temperature difference split at the CYR.

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In this work, photovoltachromic cells (PVCCs) are fabricated using a solvent-free polyethylene glycol (PEG)-titanium hybrid polymer electrolyte. With appropriate addition of 1,2-dimethyl-3-propylimidazolium iodide in the electrolyte, the range of tunable colored-state transmittance of the PVCC is enlarged due to an improved fill factor. A transmittance modulation larger than 40% can be maintained for at least 3 months, demonstrating the good long-term stability of PVCCs fabricated using the solvent-free PEG-Ti hybrid electrolyte.

RESUMEN

The synthesis of central-ring halogenated pentiptycene phenols 12-14 and dihalogenated pentiptycenes 15-17 is reported. Their utilities as building blocks for preparing new pentiptycene-derived pi-conjugated systems through the Sonogashira, Heck, and Suzuki reactions are also demonstrated.

RESUMEN

Benzynes react with allylic acetates or halides and terminal alkynes in the presence of Pd(PPh3)4, CuI and CsF in CH3CN at 50 degrees C for 5 h to give 1-allyl-2-alkynylbenzene derivatives in good to excellent yields.

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RESUMEN

The genetic structure of the Asian tri-spine horseshoe crab, Tachypleus tridentatus, was investigated in three populations of Taiwan Strait using mitochondrial (mt) AT-rich region DNA sequences. We examined 23 individuals from Kinmen, an island located on the western side of Taiwan Strait, and 12 each from Tiexianwei and Dongwei near Magong Island in the Penghu Archipelago, in the middle of Taiwan Strait. DNA sequence analysis of 369 base pairs (bp) of the mt AT-rich region revealed 10 haplotypes among the 47 individuals, with a mean haplotypic diversity (h) of 0.626+/-0.075 and nucleotide diversity (pi) of 0.0039+/-0.00055. Pairwise F-statistics (F(ST)) revealed significantly high gene flow between Kinmen and Dongwei (F(ST)=-0.0351, p>0.05, N(e)m=infinity), but marked population subdivision and restricted gene flow between Kinmen and Tiexianwei (F(ST)=0.1382, p<0.05, N(e)m=3.1176). Between populations at Magong Island, gene flow was moderate (F(ST)=0.0634, p>0.05, N(e)m=7.3913). Mismatch distribution analysis indicated that the relatively low haplotype and nucleotide diversity observed in the Tiexianwei T. tridentatus population can be attributed to a recent bottleneck, probably due to isolation of Tiexianwei in semi-closed Magong Bay that prevents gene flow from neighboring populations.

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