Malacologia最新文献_第3页

Reproduction and Recruitment of the Intertidal Clam Darina solenoides (Bivalvia: Mactridae) in Patagonian Sandy Shores, Argentina 阿根廷巴塔哥尼亚沙滩潮间带蛤的繁殖和补充(双壳亚目:圆蛤科)

IF 1.3 4区生物学

Malacologia Pub Date : 2022-05-27 DOI: 10.4002/040.064.0203

M. López, Damián G. Gil, M. Kroeck, E. Morsan

{"title":"Reproduction and Recruitment of the Intertidal Clam Darina solenoides (Bivalvia: Mactridae) in Patagonian Sandy Shores, Argentina","authors":"M. López, Damián G. Gil, M. Kroeck, E. Morsan","doi":"10.4002/040.064.0203","DOIUrl":"https://doi.org/10.4002/040.064.0203","url":null,"abstract":"ABSTRACT Darina solenoides (P. P. King, 1832) is an abundant clam of sandy shores of southern South America. It has an essential ecologic role as a main food source for marine predators, including migratory seabirds, and is an intermediate host in parasitic life cycles. We describe the reproductive cycle and recruitment of D. solenoides in relation to environmental factors in central Patagonia, Argentina. Histological analysis of gonadal stages and quantitative indicators such as the condition index (CI), oocyte density and relative oocyte area (ROA) were examined monthly for two years (2016–2017; n = 1,315) from clams collected from two sandy shores of the San Jorge Gulf (SJG). Recruitment pattern was followed at a single site. The shell lengths ranged between 25.2 and 42.8 mm and the sex ratio did not differ significantly from 1:1. The proportion of clams showing total or partial castration by digenean trematodes was low (< 5%). A clear annual reproductive cycle was found and was characterized by high synchrony between sexes, years and sites. Proliferation of gonia extended throughout the colder months and vitellogenesis occurred mainly during the spring increase of seawater temperature and shortly after the major phytoplankton bloom. Maximum development of oocytes (mean diameter, 32.1 ± 12.9 µm) and presumed spawning by both males and females occurred during the austral summer. Settlement was also highest (mean = 162.8 ± 47.1 ind.m-2) during summer and was coincident with a second phytoplankton bloom that might favour larval development and subsequent early recruitment. This is the first reproductive study of a mactrid bivalve from the southwest Atlantic Ocean and provides useful information on the population dynamics of this key species from Patagonian sandy shores.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":"64 1","pages":"185 - 202"},"PeriodicalIF":1.3,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43214891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

On the Need for Antibiotics to Reduce Subject Losses and Biases in Experiments with Aquatic Molluscs 在水生软体动物实验中需要抗生素以减少受试者损失和偏差

IF 1.3 4区生物学

Malacologia Pub Date : 2022-05-27 DOI: 10.4002/040.064.0211

T. DeWitt, H. L. Prestridge

{"title":"On the Need for Antibiotics to Reduce Subject Losses and Biases in Experiments with Aquatic Molluscs","authors":"T. DeWitt, H. L. Prestridge","doi":"10.4002/040.064.0211","DOIUrl":"https://doi.org/10.4002/040.064.0211","url":null,"abstract":"Biological research is frequently hampered, prevented, or biased by subject losses (Grafen, 1988; Weis, 2018). Subject losses force researchers to either repeat experiments or conduct analyses on a subset (the survivors) of the original experimental organisms. Repeating experiments has obvious financial and logistic consequences and offers no guarantee that losses will be fewer in subsequent efforts. Furthermore, data taken only on survivors is biased when mortality is correlated with variables of interest – the “missing fraction” problem (Grafen, 1988; Bennington & McGraw, 1995; Nakagawa & Freckleton, 2008). Subject losses reduce experimental sample size and balance and thereby also reduce statistical confidence, inferential power, and ultimately, the value of the research. Losses in aquatic research can stem from a wide range of causes such as inappropriate water chemistry, temperature, sudden change in physical parameters, or pathogens (Mori & Smith, 2019). Pathogens, in particular, can be a major cause of experimental subject mortality, even mass die-offs, due largely to the enclosed systems in which experiments are conducted (Kent et al., 2009; Mori et al., 2019). Yet even where pathogens cause little mortality, morbidity effects can similarly, though more cryptically, bias results (Kent et al. 2009). The best approach to protecting experiments where losses have been known to occur will often be to proactively prevent subject deaths and morbidity. Improved husbandry, including quarantines and preventive medication, can potentially reduce or eliminate subject losses and pathogen associated biases (McEwen & Fedorka-Cray, 2002). Preventive measures can introduce side-effects or bias of their own, such as gut or skin flora disruption which can impact experimental endpoints such as body weight (Carlson et al., 2017). Thus antibiotics should be considered only if benefits are likely to outweigh drawbacks for projects that are costly MALACOLOGIA, 2022, 64(2): 303–307","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":"64 1","pages":"303 - 307"},"PeriodicalIF":1.3,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46835886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Redescription of Rhinus ciliatus (Gastropoda: Simpulopsidae), An Endemic Species from the Atlantic Rainforest in Brazil 巴西大西洋雨林特有种纤毛虫Rhinus cillatus的重新描述（腹足目：拟纤毛虫科）

IF 1.3 4区生物学

Malacologia Pub Date : 2022-05-27 DOI: 10.4002/040.064.0206

Anna C. A. Salles, C. Oliveira

引用次数: 0

Allometry in the Freshwater Pearl Mussel (Margaritifera margaritifera L.): Mussels Tend to Grow Flatter at Higher Water Speed 淡水珍珠贻贝（Margaritifera margartifera L.）的异速测定法：贻贝在较高的水流速度下倾向于变平

IF 1.3 4区生物学

Malacologia Pub Date : 2022-05-27 DOI: 10.4002/040.064.0208

A. Cordero-Rivera, P. Ondina, A. Outeiro, R. Amaro, E. S. Miguel

{"title":"Allometry in the Freshwater Pearl Mussel (Margaritifera margaritifera L.): Mussels Tend to Grow Flatter at Higher Water Speed","authors":"A. Cordero-Rivera, P. Ondina, A. Outeiro, R. Amaro, E. S. Miguel","doi":"10.4002/040.064.0208","DOIUrl":"https://doi.org/10.4002/040.064.0208","url":null,"abstract":"ABSTRACT The freshwater pearl mussel (Margaritifera margaritifera) is one of the longest-lived invertebrate species in the world and one of the most threatened freshwater animals in Europe. Its southernmost populations, located in northwestern Spain, are in a critical conservation situation and are still understudied. Here we calibrate a non-invasive method for calculating the volume of the shell and use it to study the ontogenetic scaling of shell volume on shell length. We characterized ontogenetic growth and determined allometric relationships in 16 M. margaritifera northwestern Spain populations by using ordinary least squares regression, major axis and reduced major axis methods. We estimated topographic slopes of the sampling points using a GIS system, as a proxy of water speed. We measured 803 shells and found that the volume of the shell can precisely be estimated using three linear measurements. We found evidence for negative allometry of shell volume in the global sample and in 11 populations. We hypothesized that water speed would affect allometric patterns of local populations. Results suggest a negative relationship between the allometric slope and the topographic slope of the river section inhabited by M. margaritifera. We propose that when water speed is higher, larger mussels become proportionally flatter than in locations where water current is slower, allowing them to burrow more easily in the sediment. Our method will allow estimation of M. margaritifera biomass and ontogenetic growth without killing any specimens, which will contribute to conservation programs for this species.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":"64 1","pages":"257 - 267"},"PeriodicalIF":1.3,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42210122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Morphological and Molecular Investigations on Squids of the Genera Uroteuthis and Loliolus from the Indian Coast to Resolve Taxonomic Ambiguities 印度海岸乌贼属和Loliolus属鱿鱼的形态和分子研究以解决分类歧义

IF 1.3 4区生物学

Malacologia Pub Date : 2022-05-27 DOI: 10.4002/040.064.0205

N. Krishnan, S. Sukumaran, Wilson Sebastian, A. Gopalakrishnan

{"title":"Morphological and Molecular Investigations on Squids of the Genera Uroteuthis and Loliolus from the Indian Coast to Resolve Taxonomic Ambiguities","authors":"N. Krishnan, S. Sukumaran, Wilson Sebastian, A. Gopalakrishnan","doi":"10.4002/040.064.0205","DOIUrl":"https://doi.org/10.4002/040.064.0205","url":null,"abstract":"ABSTRACT The phylogenetic relationships of inshore squid species in the family Loliginidae is still ambiguous owing to the lack of morphological and molecular data. In the present study, the taxonomic status of squid species Uroteuthis duvaucelii (Orbigny, 1848), Uroteuthis edulis (Hoyle, 1885), Uroteuthis singhalensis (Ortmann, 1891) and Loliolus hardwickei (Gray, 1849) from the Indian coast was elucidated by performing both morphological and genetic analyses. These Uroteuthis species showed marked differences in arm sucker teeth among species. Sharpness of tentacular sucker teeth was slightly increased in the order U. edulis < U. duvaucelii < U. singhalensis. Sexual dimorphism in tentacular teeth was observed in L. hardwickei. Uroteuthis singhalensis is morphologically very close to U. duvaucelii, as inferred by similar shape (broad, squared) and number (5–9) of arm teeth. Bayesian phylogenetic analysis using mitochondrial COI (650 bp), Cyt b (900bp) and COI-Cyt b combined gene sequences re-established the concept of monophyly of Loliolini with the additional number of species U. singhalensis and L. hardwickei. Our reconstructed phylogeny strongly supports Uroteuthis as a paraphyletic taxon as all organisms belonging to the genus Loliolus, including L. hardwickei (subgenus: Loliolus) explicitly grouped with one of the Uroteuthis clades. Distinct subclades within U. duvaucelii and U. edulis from the Indian Ocean may represent cryptic species.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":"64 1","pages":"215 - 230"},"PeriodicalIF":1.3,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46159385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of Intertidal Distribution on the Physiological Performance of the Filter-Feeder Bivalve Perumytilus purpuratus (Bivalvia, Mytilidae) from Southern Chile 潮间带分布对智利南部滤食性双壳虫生理性能的影响

IF 1.3 4区生物学

Malacologia Pub Date : 2021-08-10 DOI: 10.4002/040.064.0108

J. Montory, O. Chaparro, L. P. Salas-Yanquin, J. Büchner-Miranda, J. Pechenik, V. Cubillos

{"title":"Impact of Intertidal Distribution on the Physiological Performance of the Filter-Feeder Bivalve Perumytilus purpuratus (Bivalvia, Mytilidae) from Southern Chile","authors":"J. Montory, O. Chaparro, L. P. Salas-Yanquin, J. Büchner-Miranda, J. Pechenik, V. Cubillos","doi":"10.4002/040.064.0108","DOIUrl":"https://doi.org/10.4002/040.064.0108","url":null,"abstract":"ABSTRACT Intertidal animals experience reduced feeding times and differentiated respiratory capacity associated with aerial exposure, the duration of which depends on their location within the intertidal zone. Perumytilus purpuratus is a sessile mussel that forms dense mats in the rocky mid-intertidal in southern Chile. For this species, we documented the impact of different times of aerial exposure (3 and 6 h) on rates of oxygen consumption and feeding, according to their vertical location (upper and lower limits) within the intertidal zone. Mean oxygen consumption rates in air for individuals located in the upper intertidal zone were 52% higher than those of individuals located at the lower limits of their intertidal distribution. Additionally, individuals from the lower intertidal region always presented higher rates of oxygen consumption and particle clearance rates (58% higher and 18% higher, respectively) during immersion compared to individuals collected from the upper limit of their intertidal distribution, regardless of the duration of previous aerial exposure. Although we found no significant habitat-related differences in the relationship between shell length and gill surface area, individuals sampled from the lower intertidal zone were 8% heavier in dry tissue weight than individuals with the same shell lengths collected from of the upper limit of their intertidal distribution. Our results suggest that the individuals of this species near the upper limits of their intertidal distribution can probably compensate (e.g., higher absorption rate) for the reduced time that they have available for clearance, which might help them to avoid a major energetic disadvantage.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":"64 1","pages":"137 - 147"},"PeriodicalIF":1.3,"publicationDate":"2021-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44314945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Letter from the Editor 编辑来信

IF 1.3 4区生物学

Malacologia Pub Date : 2021-08-10 DOI: 10.4002/040.064.0109

윤나영, 김보경, 안성구

引用次数: 0

A New Species of Placida (Gastropoda: Sacoglossa) from Southern South America 标题南美南部扁足目一新种(腹足目:舌足目)

IF 1.3 4区生物学

Malacologia Pub Date : 2021-08-10 DOI: 10.4002/040.064.0106

Nicolás Cetra, D. E. Gutiérrez Gregoric, Andrea Roche

引用次数: 1

Neuronal Transcriptome Analysis of a Widely Recognised Molluscan Model Organism Highlights the Absence of Key Proteins Involved in the De Novo Synthesis and Receptor-Mediation of Sex Steroids in Vertebrates 一种被广泛认可的软体动物模式生物的神经元转录组分析强调了脊椎动物性类固醇从头合成和受体介导的关键蛋白的缺失

IF 1.3 4区生物学

Malacologia Pub Date : 2021-08-10 DOI: 10.4002/040.064.0103

I. Fodor, J. Koene, Z. Pirger

{"title":"Neuronal Transcriptome Analysis of a Widely Recognised Molluscan Model Organism Highlights the Absence of Key Proteins Involved in the De Novo Synthesis and Receptor-Mediation of Sex Steroids in Vertebrates","authors":"I. Fodor, J. Koene, Z. Pirger","doi":"10.4002/040.064.0103","DOIUrl":"https://doi.org/10.4002/040.064.0103","url":null,"abstract":"ABSTRACT Over the last ten years, the interpretation of the presence of vertebrate sex steroids in molluscs has changed dramatically. Evidence has been accumulating that CYP11A and CYP19A genes (encoding cholesterol side-chain cleavage enzyme and aromatase), that are crucial for the biosynthesis of sex steroids in vertebrates, as well as key functional sex steroid receptors, are missing in molluscan genomes. To provide further evidence, we sequenced the whole transcriptome of the central nervous system of the great pond snail (Lymnaea stagnalis) and screened it for sequences homologous to those used in the generally accepted vertebrate sex steroidogenesis pathway as well as the known sex steroid receptor-related genes (such as CYP11A, CYP19A, 3β-HSD, nPR, and nAR). Our screening confirmed the absence of several key sequences that are essential to accomplish a full sex steroid biosynthesis pathway similar to that of vertebrates. There was also no evidence for nuclear sex steroid receptors. Our findings support the contention that molluscan endocrinology differs from the well-characterized vertebrate endocrine system.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":"64 1","pages":"69 - 77"},"PeriodicalIF":1.3,"publicationDate":"2021-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46063712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Seasonal Dynamics of Oxidative and Antioxidative Parameters in Sadleriana fluminensis (Gastropoda: Hydrobiidae) 河蛙氧化和抗氧化参数的季节动态（腹足目：水螅科）

IF 1.3 4区生物学

Malacologia Pub Date : 2021-08-10 DOI: 10.4002/040.064.0102

B. Kukavica, Biljana Davidović-Plavšić, D. Dmitrović, G. Šukalo, A. Savić, V. Pešić

{"title":"Seasonal Dynamics of Oxidative and Antioxidative Parameters in Sadleriana fluminensis (Gastropoda: Hydrobiidae)","authors":"B. Kukavica, Biljana Davidović-Plavšić, D. Dmitrović, G. Šukalo, A. Savić, V. Pešić","doi":"10.4002/040.064.0102","DOIUrl":"https://doi.org/10.4002/040.064.0102","url":null,"abstract":"ABSTRACT This is the first study to document the seasonal dynamics of oxidative and antioxidative parameters in Sadleriana fluminensis (Küster, 1853). Sadleriana fluminensis mostly inhabits spring biotopes, which are threatened by anthropogenic activities. We reported changes in the malondialdehyde (MDA) content, activities of superoxide dismutase (SOD) and catalase (CAT), total antioxidative capacity (TAC), and the qualitative and quantitative composition of the soluble proteins in S. fluminensis. We collected samples from four sites along the longitudinal profile of the Krupa River in three seasons (autumn, winter, and spring). The amount of total soluble proteins and the qualitative protein composition varied seasonally at all sites. Detected protein bands were in the range of 103.8–5.7 kDa in all three seasons, whereas protein bands in the range of 105–60 kDa and 5–10 kDa were not detected in autumn or in spring. In all three seasons, the highest level of MDA was observed upstream at site 1. The values of TAC varied with site and season and were positively correlated to the soluble protein content. SOD activities were highest in winter, followed by autumn and spring; CAT activities were highest in spring, followed by winter and autumn. Principal component analysis based on oxidative and antioxidative parameters revealed marked differences between seasons. The results of this study enhance our understanding of the seasonal dynamics in protein composition and cell redox status within S. fluminensis and will aid future studies. The approach used in this study could also be applied more generally in other ecosystems for the monitoring of bioindicators.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":"64 1","pages":"57 - 67"},"PeriodicalIF":1.3,"publicationDate":"2021-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44123014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0