{"title":"Size and age structure of the population of Monoporeia affinis (Amphipoda) in the Petrozavodsk Bay of Lake Onego","authors":"N.M. Kalinkina, K.V. Isakova","doi":"10.31610/trudyzin/2023.327.3.468","DOIUrl":"https://doi.org/10.31610/trudyzin/2023.327.3.468","url":null,"abstract":"The Petrozavodsk Bay of Lake Onego is characterized by favorable temperature, food and oxygen conditions for the functioning of relict crustaceans Monoporeia affinis (Lindström, 1855) population. The analysis of the size-age population structure was performed for this species for the first time. In 2018, the spring and autumn state of the M. affinis population differed. The contribution to the total number of young crustaceans with a body length of 1.5–2.0 mm and 2.1–3.0 mm in May and September was distinguished. The number of these two size groups changed inversely from May to September, which indicated the growth processes of juveniles. The total contribution of young crustaceans to the total population at different stations varied within 40–50% in May and 20–40% in September. Based on the analysis of size-frequency histograms and the method of principal components, two age cohorts of crustaceans with a body length of 3.1–7.0 mm (the first cohort, age 1 year) and 7.1–10.0 mm (the second cohort, age 2 years) were identified. The proportion of the first cohort in the total population of M. affinis was on average 12% in May and September. The proportion of the second cohort in May was on average 2%, and in September it increased to 8%. The data obtained are in good agreement with two age cohorts of M. affinis in other lakes of Karelia.","PeriodicalId":486879,"journal":{"name":"Trudy Zoologičeskogo instituta","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135865467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Macroinvertebrates of Altai mountain rivers: factors of their formation and features of distribution within altitudinal gradient","authors":"L.V. Yanygina, О.С. Burmistrova, D.D. Volgina, A.V. Kotovschikov, V.L. Paradossky, P.A. Shipunov","doi":"10.31610/trudyzin/2023.327.3.419","DOIUrl":"https://doi.org/10.31610/trudyzin/2023.327.3.419","url":null,"abstract":"With an increase in altitude, both abiotic and biotic conditions in mountain watercourses change. To assess the features of spatial distribution of macroinvertebrates as well as to identify the driving factors of this dynamics, the data on species richness, abundance and biomass of EPT taxa (mayfly, stonefly, caddisfly) from 21 small mountain rivers of Altai were analyzed. By location, all rivers were divided into 4 groups: the ones running in the low-mountain (<1000 m asl) zone, in the low (1000–1500) and upper (1500–2000) parts of the middle mountains and in the high-mountain (>2000 m asl) zone. A total of 71 EPT macroinvertebrate taxa were recorded in the studied streams. Species richness (according to the average species number per sample) as well as abundance and biomass of macroinvertebrates decreased with an increase in altitude. The maximum variance in structural indicators of communities appeared due to the combined influence of the location of the altitudinal zone and phytoplankton development level (estimated by the content of chlorophyll a). At the same time, categorical predictors (both abiotic and biotic) included in the analysis better explained the variability of diversity-related indicators than that of abundance and biomass. When developing the environmental monitoring programs for mountain watercourses, the identified trends in reduction (with altitude) of species richness of macroinvertebrate taxa responsible for the formation of taxonomically poor and strongly vulnerable communities in high-altitude areas should be taken into account.","PeriodicalId":486879,"journal":{"name":"Trudy Zoologičeskogo instituta","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135865470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Systematics of the American Katydids (Orthoptera: Tettigoniidae). Communication 11","authors":"A.V. Gorochov","doi":"10.31610/trudyzin/2023.327.2.317","DOIUrl":"https://doi.org/10.31610/trudyzin/2023.327.2.317","url":null,"abstract":"A new material on the Neotropical genera Lichenomorphus Cadena-Castaсeda, 2011, Dissonulichen Cadena-Castaсeda, 2011, Theia Brunner-Wattenwyl, 1891, Hetaira Brunner-Wattenwyl, 1891 and Anaulacomera Stål, 1873 (Phaneropterinae) are considered with description of one new subgenus, 16 new species and six new subspecies: Euceraicerca subgen. nov. from Anaulacomera s. l.; L. dietrichi sp. nov. from Panama (Chiriqui Prov.); L. piraniucayali subsp. nov. from Peru (Ucayali Department); D. roseola sp. nov. from Peru (Cusco Department); Th. (Theia) albamacula sp. nov. from Peru (Cusco Department); Th. (Th.) sergeii sp. nov. from Peru (Cusco Department); H. (Hetaira) miaria sp. nov. from Peru (Cusco Department); A. (Cervicercora) tshugaevae sp. nov. from Peru (Cusco Department); A. (C.) lehnfeldae sp. nov. from Peru (Cusco Department); A. (C.) cristalica sp. nov. from Peru (Junin Department); A. (C.) rectiapex cusco subsp. nov. from Peru (Cusco Department); A. (C.) abrupta sp. nov. from Peru (Cusco Department); A. (C.) a. neglecta subsp. nov. from Peru (Junin Department); A. (C.) superapex hamata subsp. nov. from Peru (Cusco Department); A. (C.) lativenosa sp. nov. from Peru (Loreto Department); A. (C.) l. serrata subsp. nov. from Peru (Junin and Cusco Departments); A. (C.) angustissima sp. nov. from Peru (Cusco Department); A. (C.) rotundiloba sp. nov. from Peru (Cusco Department); A. (C.) abbreviata urubamba subsp. nov. from Peru (Cusco Department); A. (Oecella) panama sp. nov. from Panama (Panama Prov.); A. (Oe.?) leonidi sp. nov. from Peru (Junin and Cusco Departments); A. (?) minicercata sp. nov. from Peru (Cusco Department); A. (?) viadanocerca sp. nov. from Peru (Cusco and Junin Departments). Previously unknown female and male of H. (Atopana) morona Gorochov, 2014 and H. (H.) angusta Gorochov, 2014, respectively, are described. Some new data on geographical distribution of a few species are also given.","PeriodicalId":486879,"journal":{"name":"Trudy Zoologičeskogo instituta","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135795529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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