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  Seychelles Fishing Authority Annual Report 2019-2020

  Seychelles Fishing Authority (Seychelles Fishing AuthorityVictoria, Seychelles, 2022)
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  Assessment of the water quality of the Don River downstream from its confluence with the Temernik River based on the saprobity index and bioassay data

  AL-Ghizzi, Murooj Abbas Buhlool; Bakaeva, E.N. (2022)

  The Don River is one of the largest rivers in the East European Plain. The right tributary of the Don River—the Temernik River—flows through the metropolis of Rostov-on-Don and affects the water quality of the main watercourse. This study was aimed at the assessment of the organic pollution and toxicity of water in two horizons (0.3 and 9.0 m) of the Don River downstream from its confluence with the Temernik River using the saprobic index S and biotesting. Observations were carried out for 7 months in 2019. The data on the quality of the Don River water have been obtained from the combined results of two biological methods for the first time. The dynamics of changes in the quality of the river water in the course of 7 months is presented. The samples for the investigation were collected сoncurrently. Comparison of the water quality in two horizons (surface and deep) of the river section based on the data obtained using two biological methods has been conducted for the first time. The saprobity results for the phytoplankton indicated the presence of organic water pollution at both levels of the Don River during all 7 months of the study. The saprobity index values ranged from 2.0 to 3.6. Water quality was characterized as ranging from moderately polluted to polluted. This corresponds to α-β-mesosaprobic level. The maximum level of organic pollution according to the saprobity index was recorded in September for both horizons. Saprobity increases with an increase in the proportion of blue-green algae in the phytocenosis. The relative abundance of blue-green algae ranged from 45.83 to 77.77 %. The surface horizon had higher organic pollution during the warm period (May–September), and for the deep horizon it was higher during the cold period (April, October, and November). The toxic effect of the river water was manifested in the inhibition of the growth of Chlorella vulgaris. Water toxicity over the investigated period (7 months) was inconsistent. In each season, it only appeared for one month. Water toxicity at the both horizons was recorded in spring (April), summer (August), and autumn (November). High saprobity and toxic effect of the water did not always coincide. The concurrent presence of these characteristics is typical for the deep horizon. Toxicity fluctuations are apparently associated with the temporal pattern of the Temernik River pollution by the metropolis waste waters and with the measures for the Temernik River improvement taken by the municipal authorities.
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  Trends and challenges in alternative states in freshwater ecosystems: emphasizing the role of invasive species in state shifts.

  Martins, Gustavo Alda (Universidade Estadual de Maringá. Departamento de Biologia. Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais., 2022)

  Despite growing interest in the effects of non-native invasive species in changing alternative trophic states in shallow lakes, little is known when it comes to tropical regions. We carried out a systematic review to identify which terms, species, definitions and objectives were most addressed in these studies, as well as to identify possible global patterns and trends regarding the growth of these research over the years and the hot spots of publications. Our results showed that although there was a non-linear growth in the number of studies published in the last three decades regarding state shifts in freshwater environments, only a small number of them addresses the influence that non-native invasive species have in triggering trophic states changes in aquatic environments and even less in shallow lakes. In our discussion, we explore the possible reasons and consequences that these patterns bring to this area of ecology, as well as expand the results and make the work available so that it can be used as recomendation for future projects related to the topic.
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  Respostas de espécies invasoras de Poaceae ao estresse hídrico, a competição com nativas filogeneticamente próximas e a mudança climática global.

  Gonçalves, Larissa Carrara (Universidade Estadual de Maringá. Departamento de Biologia. Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais., 2021)

  Global climate change has as its main result an increase in the frequency and severity of extreme events, such as longer periods of drought, and more hot days throughout the year, which makes drought events even more severe. Certain plant species have a high invasive potential, which is due to their tolerance to adverse conditions and the recovery of their individuals after some disturbance, which increases the possibility of colonization and establishment in new environments, interfering with native communities. The effect of interspecific competition between the invasive plant Urochloa mutica and the native species Panicum dichotomiflorum was experimentally analyzed on its establishment, resistance and resilience, simulating conditions of extreme water events and the distribution of Panicum dichotomiflorum and Urochloa mutica, particularly in protected areas environmental. The results obtained showed that the native species grew less with the water changes, mainly due to the lack of water, and the invasive species did not show strong growth alterations with the disturbances used. Furthermore, the species were shown to alter the growth variables in competition, impacting the native species more. On the other hand, the species in terms of temporal stability did not change growth and both may have advantages in impacted environments. Regarding the distribution of species, the results showed that the dispersion of the invasive exotic plant will be greater in areas that already have its presence, and also that this species may invade new places, such as Germany and Austria. In a future scenario of global climate change in 2070, this invasive species could occur in protected areas. Regarding the national territory, U. mutica will lose part of its distribution in Brazil, mainly in the north and northeast regions, including areas of protection and conservation. For P. dichotomiflorum, it is possible that it will lose a large part of its natural habitat in the two future scenarios, but it will increase its occurrence in other places, being able to become a potential invasive. Therefore, the results achieved indicate that both species have important characteristics in coping with climate change and show that the native species has an invasive behavior, with information of enormous value to environmental managers, especially in the management work of the two species of Poaceae, which have invasive potential for preserved areas, and in research that evidence areas susceptible to invasion.
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  Proceedings of the 2021 Annual Meeting of the Scientific Committee on Oceanic Research, 47th SCOR Annual Meeting: Virtual Meeting - October 2021

  Scientific Committee on Oceanic Research (Scientific Committee on Oceanic ResearchNewark, Delaware, USA, 2022-08)

  This proceeding summarizes the discussions during the 2021 SCOR Annual Meeting held virtually between the 26-28 of October of 2021. Following a decision from the SCOR Executive, this proceeding also provides the links for all the background information for the meeting, including the proposals for new working groups, the reports from current SCOR working groups, projects, capacity development activities, and the reports of affiliated and partner organizations all of which were traditionally included in the SCOR Annual meeting background book until 2019. All of these can also be accessed online through the SCOR website at: https://scor-int.org/events/scor-annual-meeting-2021/. The SCOR 2021 Annual Meeting was attended by more than 200 participants from 56 countries representing all continents. Forty Nominated members from 24 SCOR National Committees and the three affiliated bodies to the Executive Committee (IABO, IAPSO, IAMAS) attended the meeting. All SCOR Working Groups, research, infrastructural, and affiliated projects, along with the affiliated and partner organizations reported on their activities. Some of the main highlights of the SCOR 2021 Annual Meeting include: (1) the approval of three new Working Groups (WGs), (2) to secure NSF funding to continue to support working group and project activities, and (3) the endorsement of SCOR working group and project activities by the UN Decade of Ocean Science for Sustainable Development. The three new WGs proposals approved were: (1) Coupling of ocean-ice-atmosphere processes: from sea-Ice biogeochemistry to aerosols and Clouds (CIce2Clouds), co-chaired by Nadja Steiner (Canada) and Megan Willis (USA), (2) CoNCENSUS: Advancing standardisation of COastal and Nearshore demersal fish visual CENSUS techniques, co-chaired by Anthony Bernard (South Africa) and Rick D. Stuart-Smith (Australia), and (3) Mixotrophy in the Oceans – Novel Experimental designs and Tools for a new trophic paradigm (MixONET), co-chaired by Aditee Mitra (UK) and George McManus (USA). SCOR continued to support capacity development activities by extending support to the visiting scholars approved for travel in 2020 and approving four new scholars to travel in 2021 or until travel is possible again. SCOR has continued to approve funding applications from conference organizers to support travel for scientists from developing countries to attend these conferences when they are rescheduled. These commitments will be honored by SCOR when travel is reinitiated. The 2022 SCOR meeting is scheduled for the first week of October 2022 in Busan, Korea, hosted by the Korean Institute of Science and Technology (KIOST), and will follow the PICES meeting which will take place in the same location the week before. The 2023 SCOR meeting is scheduled to take place in Guayaquil, Ecuador, hosted by the Instituto Oceanográfico y Antártico de la Armada del Ecuador (INOCAR) between September-October. Narrated presentations reporting on SCOR project and working group activities and progress in 2021 can also be found in the SCOR YouTube channel. https://www.youtube.com/channel/UCv-dZLizFYDOC2UTweiWj0Q/videos

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