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排序方式: 共有110条查询结果,搜索用时 15 毫秒
101.
The cephalothorax length of the marine pelagic Copepoda Acartia clausi Giesbrecht, Temora longicornis (Müller), Centropages hamatus (Lilljeborg) and Pseudocalanus sp. was monitored at 15°C during prolonged cultivation through up to 55 filial generations and at different concentrations of food. The length of T. longicornis decreased considerably during the first 15 generations and remained rather constant thereafter. In the other species, body length increased slightly or remained almost constant. Genetic changes are probably involved. Food concentration influenced body size of all species, particularly C. hamatus, in which 80% of the natural size range may be explained by differences in food concentration. The idea that temperature is a dominant factor in determining the length of copepods should be reconsidered. 相似文献
102.
103.
Francesca Romana Grati Denise Molina Gomes Jose Carlos Pinto B. Ferreira Celine Dupont Viola Alesi Laetitia Gouas Nina Horelli-Kuitunen Kwong Wai Choy Sandra García-Herrero Alberto Gonzalez de la Vega Krzysztof Piotrowski Rita Genesio Gloria Queipo Barbara Malvestiti Bérénice Hervé Brigitte Benzacken Antonio Novelli Philippe Vago Kirsi Piippo Tak Yeung Leung Federico Maggi Thibault Quibel Anne Claude Tabet Giuseppe Simoni François Vialard 《黑龙江环境通报》2015,35(8):801-809
104.
Ofelia Gonzalez Andreas Zedrosser Fanie Pelletier Jon E. Swenson Marco Festa-Bianchet 《Behavioral ecology and sociobiology》2012,66(7):1025-1032
Experimental manipulations have revealed positive effects of litter reduction on offspring mass in small mammals, but little is known about this trade-off in large mammals. We examined the determinants of natural litter size variation and quantified the effects of litter size, maternal characteristics, and litter composition on yearling mass using 24?years of data on marked brown bears (Ursus arctos) in Sweden. Infanticide by adult males is a major cause of cub-of-the-year mortality, leading to litter size reductions. Litter size (n?=?265) at den emergence ranged from one to four cubs (average, 2.7) and increased with maternal age. Litter size, however, appeared independent of maternal size, population density, interlitter interval, study area, or previous litter sex ratio. Yearling body mass increased with maternal body size but was independent of litter sex ratio. Litter size and yearling mass were negatively correlated, mostly because singletons were about 30?% heavier than yearlings from litters of two to four cubs. In reduced litters, survivors were on average 8?% heavier as yearlings than individuals from intact litters, suggesting that sibling competition reduces growth. Trade-offs between litter size and yearling mass in bears appear similar in magnitude to those found in small mammals. 相似文献
105.
Cañaveras JC Cuezva S Sanchez-Moral S Lario J Laiz L Gonzalez JM Saiz-Jimenez C 《Die Naturwissenschaften》2006,93(1):27-32
In this study, we show that moonmilk subaerial speleothems in Altamira Cave (Spain) consist of a network of fiber calcite
crystals and active microbial structures. In Altamira moonmilks, the study of the typology and distribution of fiber crystals,
extracellular polymeric substances, and microorganisms allowed us to define the initial stages of fiber crystal formation
in recent samples as well as the variations in the microstructural arrangement in more evolved stages. Thus, we have been
able to show the existence of a relationship among the different types of fiber crystals and their origins. This allowed us
to outline a model that illustrates the different stages of formation of the moonmilk, developed on different substrata, concluding
that microbes influence physicochemical precipitation, resulting in a variety of fiber crystal morphologies and sizes. 相似文献
106.
Altamira Cave contains valuable paleolithic paintings dating back to 15,000 years. The conservation of these unique paintings
is attracting increasing interest, and so, understanding microbial proliferation in Altamira Cave represents a prioritary
objective. Here, we show for the first time that members of the Crenarchaeota were metabolically active components of developing
microbial communities. RNA was extracted directly from the studied environment, and a number of 16S rRNA gene sequences belonging
to the low-temperature Crenarchaeota were detected. Although low-temperature Crenarchaeota detected in a variety of ecosystems
by using molecular techniques remain uncultured, this RNA-based study confirms an active participation of the Crenarchaeota
in cave biogeochemical cycles. 相似文献
107.
M. E. Alvarez Piñeiro M. A. Lage Yusty J. Simal Lozano S. T. Carril Gonzalez‐Barros 《毒物与环境化学》2013,95(1-4):31-36
PCB and PCT residues were measured in free‐living (FM) and cultivated mussels (CM) from ten sites in Galicia by gas chromatography with electron capture detector and capillary column. The level of PCB1260 and PCT5460 in FMs increases going from Muros‐Noya to Vigo estuarine bay. There was a trend of increase from north to south. 相似文献
108.
109.
Shawan Chowdhury Kristofer Gonzalez M. Çisel Kemahlı Aytekin Seung-Yun Baek Michał Bełcik Sandro Bertolino Sjoerd Duijns Yuqing Han Kerstin Jantke Ryosuke Katayose Mu-Ming Lin Elham Nourani Danielle Leal Ramos Marie-Morgane Rouyer William Sidemo-Holm Svetlana Vozykova Veronica Zamora-Gutierrez Tatsuya Amano 《Conservation biology》2022,36(4):e13883
English is widely recognized as the language of science, and English-language publications (ELPs) are rapidly increasing. It is often assumed that the number of non-ELPs is decreasing. This assumption contributes to the underuse of non-ELPs in conservation science, practice, and policy, especially at the international level. However, the number of conservation articles published in different languages is poorly documented. Using local and international search systems, we searched for scientific articles on biodiversity conservation published from 1980 to 2018 in English and 15 non-English languages. We compared the growth rate in publications across languages. In 12 of the 15 non-English languages, published conservation articles significantly increased every year over the past 39 years, at a rate similar to English-language articles. The other three languages showed contrasting results, depending on the search system. Since the 1990s, conservation science articles in most languages increased exponentially. The variation in the number of non-English-language articles identified among the search systems differed markedly (e.g., for simplified Chinese, 11,148 articles returned with local search system and 803 with Scopus). Google Scholar and local literature search systems returned the most articles for 11 and 4 non-English languages, respectively. However, the proportion of peer-reviewed conservation articles published in non-English languages was highest in Scopus, followed by Web of Science and local search systems, and lowest in Google Scholar. About 20% of the sampled non-English-language articles provided no title or abstract in English; thus, in theory, they were undiscoverable with English keywords. Possible reasons for this include language barriers and the need to disseminate research in countries where English is not widely spoken. Given the known biases in statistical methods and study characteristics between English- and non-English-language studies, non-English-language articles will continue to play an important role in improving the understanding of biodiversity and its conservation. 相似文献
110.
Kwon Soojin Zambrano Marielis C. Venditti Richard A. Frazier Ryen Zambrano Franklin Gonzalez Ronalds W. Pawlak Joel J. 《Environmental science and pollution research international》2022,29(40):60584-60599
Environmental Science and Pollution Research - Nonwoven products are widely used in disposable products, such as wipes, diapers, and masks. Microfibers shed from these products in the aquatic and... 相似文献