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Fig. 7 in Rhinogobius mizunoi, A New Species of Freshwater Goby (Teleostei: Gobiidae) from Japan

Fig. 7. Freshly-collected specimens of Rhinogobius fluviatilis. A: OMNH-P 18393, male, 53.8 mm SL, Komenotsu-gawa River, Kagoshima Prefecture, Japan; B: OMNH-P 18429, female, 69.8 mm SL, Nabeno-gawa River, Kagoshima Prefecture, Japan. Photographed by T. Suzuki.

Fig. 5 in Rhinogobius mizunoi, A New Species of Freshwater Goby (Teleostei: Gobiidae) from Japan

Fig. 5. Freshly-collected (A and B) and alcohol-preserved (C) paratype of Rhinogobius mizunoi (OMNH-P 40618, female, 61.9 mm SL). Photographed by T. Suzuki.

Fig. 4 in Rhinogobius mizunoi, A New Species of Freshwater Goby (Teleostei: Gobiidae) from Japan

Fig. 4. Freshly-collected (A and B) and alcohol-preserved (C) holotype of Rhinogobius mizunoi (SPMN-PI 3196, male, 67.2 mm SL). Photographed by T. Suzuki..

Fig. 3 in Rhinogobius mizunoi, A New Species of Freshwater Goby (Teleostei: Gobiidae) from Japan

Fig. 3. Dorsal (top), lateral (middle), and ventral (bottom) views of head of holotype of Rhinogobius mizunoi (SPMN-PI 3196, male, 67.2 mm SL), showing freshlycollected coloration. Photographed by T. Suzuki.

Fig. 6 in Rhinogobius mizunoi, A New Species of Freshwater Goby (Teleostei: Gobiidae) from Japan

Fig. 6. Underwater photographs of male (A, KPM- NR 91331B) and female (B, KPM-NR 78800A) of Rhinogobius mizunoi, taking at lower reach of Okitsugawa River, Shizuoka Prefecture, Japan. Photographed by K. Uchino.

Fig. 1 in Rhinogobius mizunoi, A New Species of Freshwater Goby (Teleostei: Gobiidae) from Japan

Fig. 1. Dorsal view of head (A) and ventral view of pelvic fin (B) of paratype of Rhinogobius mizunoi (OMNH-P 40617, a male, 73.6 mm SL), stained with alizarin red. Black circle with black letters F, H, K, and L indicate sensory-canal pores; letter with prime mark indicates the terminal opening if sensory canal. Yellow dots indicate scales along edge of scaled area on nape and occipital region; letters P1, P2, and P3 indicate boundary of anterior extension of scaled area along predorsal midline, boundary of anterior extension of scaled area on side of occipital region, and boundary of most concave point of scaled area between P1 and P2, respectively. Black letters 1–5 indicate number of segmented rays of pelvic fin. Photographed and annotated by T. Suzuki.

Fig. 2 in Rhinogobius mizunoi, A New Species of Freshwater Goby (Teleostei: Gobiidae) from Japan

Fig. 2. Dorsal (top), lateral (middle), and ventral (bottom) views of head of holotype of Rhinogobius mizunoi (SPMN-PI 3196, male, 67.2 mm SL), showing cephalic sensory pores and papillae. Red circle with red letters indicate sensory canal pores (letters with prime marks indicate terminal opening of sensory canal); yellow dots indicated by yellow letters represent sensory papillae; black arrows show positions of dorsal and ventral most of gill opening. Abbreviations: AN, anterior narial pore; PN, posterior narial pore. Photographed and annotated by T. Suzuki.

opencc-zeroMay 2024View details →

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Data from: Growth and longevity of the endangered freshwater pearl mussel (Margaritifera margaritifera): Implications for conservation and management

Key life-history data, such as growth and age, are necessary to effectively manage and conserve threatened freshwater mussel species. Traditionally growth and age studies require large yet destructive sample sizes covering all age classes. Such methods pose a risk to populations of conservation concern, and therefore alternative methods that need only limited sample sizes are necessitated to prevent further threats to such populations. We applied retrospective shell growth at age reconstructions to 98 critically endangered freshwater pearl mussel (FPM) individuals from 34 populations across Finland and Sweden, enabling the use of extremely small sample sizes (n = 1–6 per population). We compared the performance of six different growth models with the reconstructed size-at-age data across FPM juvenile (<20 years old) and adult life stages. The growth reconstruction model showed reasonable skill in reconstructing FPM growth patterns. The von Bertalanffy model was shown to be a good general descriptor of growth for FPM, but it systematically underestimated the asymptotic size. The power law model was the most accurate in estimating juvenile growth (lowest deviances from the size-at-age data). FPM showed great variability in longevity (Amax = 54–254 years) and growth constant k (0.018– 0.057 year-1). Our results show that reasonable estimates of growth can be attained even when sample sizes are extremely limited. The results can be further applied to gain knowledge on the population's age structure, size at maturation, and recovery potential. The methodology is applicable to other freshwater mussel species of conservation concern.

opencc-zeroJan 2024View details →

Linked collectors and determiners for: Freshwater benthic invertebrates ecological collection NTNU University Museum.

Natural history specimen data linked to collectors and determiners held within, "Freshwater benthic invertebrates ecological collection NTNU University Museum". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/33591b80-0e31-480c-82ce-2f57211b10e6">https://bionomia.net/dataset/33591b80-0e31-480c-82ce-2f57211b10e6</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/33591b80-0e31-480c-82ce-2f57211b10e6">https://gbif.org/dataset/33591b80-0e31-480c-82ce-2f57211b10e6</a>. Formatted as a Frictionless Data package.

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Data from: A multifaceted ecological assessment reveals the invasion of the freshwater red macroalga Montagnia macrospora (Batrachospermales, Rhodophyta) in Taiwan

Invasive freshwater macroalgae are rarely described. Montagnia macrospora is a freshwater red alga introduced from South America to East Asia via the global aquarium trade. The earliest occurrence record of this alga in Taiwan is dated 2005. To determine whether M. macrospora has become invasive in Taiwan and to understand the traits that facilitated its invasion, we took a multifaceted approach that combines examination of ecological background and population genetic analysis. Our island-wide survey showed that M. macrospora is widespread in the field across Taiwan, where the climate greatly differs from that of South America, and can self-sustain for nearly a decade. Our population genetic analysis revealed a lack of genetic diversity of M. macrospora in Taiwan, consistent with the hypothesis that the alga expanded through asexual reproduction. Moreover, during our long-term ecological assessments and field surveys, we observed thatM. macrospora is an ecological generalist that can survive in a wide range of temperature, pH, illumination, and nutrient enrichment. Taken together, our data suggest that M. macrospora has successfully invaded the freshwater ecosystems ofTaiwan, likely due to its ability to disperse asexually and to grow under broad environmental conditions. We hope that our study brings attention to invasive freshwater algae, which have been overlooked in conservation planning and management.

opencc-zeroDec 2023View details →

Рис. 3. Микроскульптура наружной поверхности глохидиальных створок Nodularia amurensis (А – р. РаЗдольнаЯ; B – р. Амур, Б. Уссурийский остров) и Middendorffinaia sujfunensis (С): A – участок створки ниже аддуктора; B – центральнаЯ часть створки (район аддуктора); C – у лигамента. СканируюЩаЯ ЭлектроннаЯ микроскопиЯ. МасШтаб 2 мкм. in Morphology of glochidia of the freshwater mussels Nodularia amurensis and Middendorffinaia sujfunensis (Bivalvia: Unionidae: Nodulariinae) from the Russian Far East

Рис. 3. Микроскульптура наружной поверхности глохидиальных створок Nodularia amurensis (А – р. РаЗдольнаЯ; B – р. Амур, Б. Уссурийский остров) и Middendorffinaia sujfunensis (С): A – участок створки ниже аддуктора; B – центральнаЯ часть створки (район аддуктора); C – у лигамента. СканируюЩаЯ ЭлектроннаЯ микроскопиЯ. МасШтаб 2 мкм.

Рис. 4. Микроскульптура наружной поверхности глохидиальных створок перловиц Nodularia biwae (A, D – увеличенный фрагмент) и Lanceolaria grayana (B, C – увеличенный фрагмент) иЗ Японии, о-в Хонсю. СканируюЩаЯ ЭлектроннаЯ микроскопиЯ. МасШтаб 1 мкм (А, В) и 2 мкм (C, D). Fig. 4. Microsculpture of external surface of glochidia of mussels Nodularia biwae (A, D – fragment) and Lanceolaria grayana (B, C – fragment) from Honshu Is., Japan. Scanning electron microscopy. Scale bar 1µm (А, В) and 2 µm (C, D). in Morphology of glochidia of the freshwater mussels Nodularia amurensis and Middendorffinaia sujfunensis (Bivalvia: Unionidae: Nodulariinae) from the Russian Far East

Рис. 4. Микроскульптура наружной поверхности глохидиальных створок перловиц Nodularia biwae (A, D – увеличенный фрагмент) и Lanceolaria grayana (B, C – увеличенный фрагмент) иЗ Японии, о-в Хонсю. СканируюЩаЯ ЭлектроннаЯ микроскопиЯ. МасШтаб 1 мкм (А, В) и 2 мкм (C, D). Fig. 4. Microsculpture of external surface of glochidia of mussels Nodularia biwae (A, D – fragment) and Lanceolaria grayana (B, C – fragment) from Honshu Is., Japan. Scanning electron microscopy. Scale bar 1µm (А, В) and 2 µm (C, D).

Fig. 1 in Morphology of glochidia of the freshwater mussels Nodularia amurensis and Middendorffinaia sujfunensis (Bivalvia: Unionidae: Nodulariinae) from the Russian Far East

Fig. 1. Glochidia of Nodularia amurensis from various view angles: А – Razdolnaya River; B, С – Amur River, Petrovskaya channel; D – Amur River, B. Ussuriysky Island. Abbreviations: lig – ligament; v.a – ventral angle; l.th – larval thread; v – valve of open glochidial shell. Scanning electron microscopy. Scale bar 2 µm.

Fig. 2 in Morphology of glochidia of the freshwater mussels Nodularia amurensis and Middendorffinaia sujfunensis (Bivalvia: Unionidae: Nodulariinae) from the Russian Far East

Fig. 2. Glochidia of Middendorffinaia sujfunensis from various view angles. Abbreviations: lig – ligament; v.a – ventral angle; l.th – larval thread; v – valve of open glochidial shell. Scanning electron microscopy. Scale bar: 2 µm.

Fig. 4 in Redescription of Aspidogaster limacoides Diesing, 1834 (Aspidogastrea: Aspidogastridae) from freshwater fishes of northern Germany

Fig. 4 Cross-section of Aspidogaster limacoides, histology, from the level of the anterior edge of the ventral disc: A and D arrows (black and blue) showing marginal organs on ventral disc; B, E and F diagram of marginal organ (black and red arrows); C dorsoventral and longitudinal muscles (green arrows). Note: A–C H&E staining and D–F Alcian blue staining

Fig. 3 in Redescription of Aspidogaster limacoides Diesing, 1834 (Aspidogastrea: Aspidogastridae) from freshwater fishes of northern Germany

Fig. 3 Aspidogaster limcoides, SEM: A marginal organ with terminal duct (scale bar = 2 µm); B and B 2: Arrow showing pits inside the mouth (scale bar = 20 µm); C Ventral disc showing pits on alveoli and septa (scale bar = 10 µm); D dorsal view, posterior body with pits (scale bar = 2 µm); E excretory pore (scale bar = 20 µm)

Fig. 5 in Redescription of Aspidogaster limacoides Diesing, 1834 (Aspidogastrea: Aspidogastridae) from freshwater fishes of northern Germany

Fig. 5 Phylogenetic tree based on analyses of ITS1-5.8S-ITS2 sequences of species belonging to the genus Aspidogaster using the maximum likelihood method of phylogenetic reconstruction with TIM2 + I model according to jModelTest software v 2.1.10. Nodal numbers give bootstrap statistical support for the analyses. AN, Amur River, Nikolaevsk-na-Amure; AK, Amur River, Khabarovsk; Kh, Khanka Lake; Chi, China; ER, European part of Russia; Ger, Germany; JPN, Japan. *Misidentified A. chongqingensis

Fig. 2 in Redescription of Aspidogaster limacoides Diesing, 1834 (Aspidogastrea: Aspidogastridae) from freshwater fishes of northern Germany

Fig. 2 Aspidogaster limcoides, SEM: A dorsal view (scale bar = 100 µm); B ventral view with ventral disc (scale bar = 100 µm); C neck region, arrow showing depression of neck (scale bar = 20 µm), square D showing papillae-like structures posterior lateral to mouth; D posterior lateral papillae (arrow) (scale bar = 2 µm); E ventral disc, arrow showing marginal organ (scale bar = 20 µm); F ventral rim with marginal organ with terminal duct (arrow) (scale bar = 10 µm)

Fig. 1 Aspidogaster limacoides line drawings from Rutilus rutilus from North Germany. A in Redescription of Aspidogaster limacoides Diesing, 1834 (Aspidogastrea: Aspidogastridae) from freshwater fishes of northern Germany

Fig. 1 Aspidogaster limacoides line drawings from Rutilus rutilus from North Germany. A Dorsal view (scale bar = 500 µm); B ventral view (scale bar = 500 µm); C eggs (scale bar = 50 µm); D cirrus sac (scale bar = 200 µm)