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排序方式: 共有140条查询结果,搜索用时 15 毫秒
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Virginie Marques Paul Castagné Andréa Polanco Fernández Giomar Helena Borrero-Pérez Régis Hocdé Pierre-Édouard Guérin Jean-Baptiste Juhel Laure Velez Nicolas Loiseau Tom Bech Letessier Sandra Bessudo Alice Valentini Tony Dejean David Mouillot Loïc Pellissier Sébastien Villéger 《Conservation biology》2021,35(6):1944-1956
Assessing the impact of global changes and protection effectiveness is a key step in monitoring marine fishes. Most traditional census methods are demanding or destructive. Nondisturbing and nonlethal approaches based on video and environmental DNA are alternatives to underwater visual census or fishing. However, their ability to detect multiple biodiversity factors beyond traditional taxonomic diversity is still unknown. For bony fishes and elasmobranchs, we compared the performance of eDNA metabarcoding and long-term remote video to assess species’ phylogenetic and functional diversity. We used 10 eDNA samples from 30 L of water each and 25 hr of underwater videos over 4 days on Malpelo Island (pacific coast of Colombia), a remote marine protected area. Metabarcoding of eDNA detected 66% more molecular operational taxonomic units (MOTUs) than species on video. We found 66 and 43 functional entities with a single eDNA marker and videos, respectively, and higher functional richness for eDNA than videos. Despite gaps in genetic reference databases, eDNA also detected a higher fish phylogenetic diversity than videos; accumulation curves showed how 1 eDNA transect detected as much phylogenetic diversity as 25 hr of video. Environmental DNA metabarcoding can be used to affordably, efficiently, and accurately census biodiversity factors in marine systems. Although taxonomic assignments are still limited by species coverage in genetic reference databases, use of MOTUs highlights the potential of eDNA metabarcoding once reference databases have expanded. 相似文献
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Gennequin Cédric Hany Sara Tidahy Haingomalala Lucette Aouad Samer Estephane Jane Aboukaïs Antoine Abi-Aad Edmond 《Environmental science and pollution research international》2016,23(22):22744-22760
Environmental Science and Pollution Research - Hydrogen production by methane dry reforming is an important yet challenging process. A performing catalyst will favor the thermodynamic equilibrium... 相似文献
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Eric Parmentier Loïc Kéver Margarida Casadevall David Lecchini 《Marine Biology》2010,157(10):2317-2327
Synchronous underwater audio–video recordings and a passive acoustic detector were used to study the behaviour of Dascyllus flavicaudus. These damselfish produced sounds during six different behaviours and showed three different colour patterns while doing
so. These sounds can be grouped into three classes: sounds associated with (1) fighting; (2) mating/visiting and (3) chasing
and signal jumps. Moreover, the evolution of the different kinds of sound is discussed: the first calls could be a single
pulse originating in teeth snapping. Modifications in the rhythm and number of pulses allowed the fish to build new messages.
Daily recordings showed that sound production rates were higher at sunrise and sunset than during the day and that no sound
was produced during the night. However, the kinds of call were different: sunrise sounds seemed mainly associated with mating/visiting,
whereas the sounds associated with chasing and to signal jumps were mainly found at sunset. 相似文献
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Loïc A. Hardouin Dominique Robert Vincent Bretagnolle 《Behavioral ecology and sociobiology》2008,62(12):1909-1918
The dawn chorus is a striking feature of spring mornings and a characteristic behaviour of many bird species, particularly
the passerines. Dawn singing has been considered a reliable signal of male quality for mate and rival assessment. Singing
is presumed to be relatively costly at dawn both because air temperatures are relatively low and because birds have not fed
overnight. Models of optimal daily routine predict the existence of a “dusk chorus” in nocturnal birds, although this prediction
has received little empirical attention. Nocturnal birds at dusk may be energy-limited because of a lack of daytime feeding,
and singing at dusk may thus ensure signal reliability. Here, we used an observational and experimental approach to study
vocal behaviour at dusk and dawn in a nocturnal raptor, the little owl Athene noctua. We assess whether male little owls adjust their vocal behaviour according to feeding stage (i.e. period of the night), ambient
air temperature and territorial context (i.e. spontaneous calling behaviour vs elicited calling by intrusion). Across different
temperatures, we find that both spontaneous vocal activity and inter-individual variability in call duration increased at
dusk, clearly indicating a dusk chorus phenomenon. Results from playback presentations suggest that food, rather than air
temperature, is likely to be more constraining at dusk. We discuss how comparing dusk and dawn choruses in nocturnal and diurnal
species can provide insights into both mechanistic and functional aspects of signalling behaviour. 相似文献
69.
Bela Zutshi S. G. Raghu Prasad R. Nagaraja 《Environmental monitoring and assessment》2010,168(1-4):11-19
Blood is an indicator of physiological condition of an animal. Therefore, a field study was conducted to investigate the hematological parameters of wild population of rohu, Labeo rohita (Ham). The following aspects were evaluated in blood: hemoglobin content, red blood cell (RBC) and white blood cell (WBC) count, packed cell volume (PCV), and mean corpuscular volume (MCV) and mean corpuscular hemoglobin concentration (MCHC) values, and in plasma: cholesterol, protein, and glucose levels. For this purpose, rohu fish of varying sizes and weights were sampled from Hebbal (receiving a storm water drain) and Chowkalli lake (received domestic sewage and industrial effluents from various sources and was more polluted than Hebbal lake). It revealed noticeable differences in hemoglobin content, RBC and WBC count, and PCV and MCHC values. Severe anemia can be marked by a significant decrease in RBC count (p?<?0.5), hemoglobin content, and PCV and MCHC values, whereas an increase in leukocyte count and MCV values were observed in fish from Chowkalli lake. Fish from lake B had fewer RBC and low concentration of serum protein and cholesterol. Serum concentration of glucose showed initial higher levels and then low concentration (900–1,500 g) in fish from lake B when compared to lake A. The variation in values of different parameters can be attributed to exposure of fish to various types of pollutants present mainly in the Chowkalli lake which receives heavy metals, synthetic detergents, petroleum products, and other acid and alkali substances from the nearby local industries. Other observations of these fish include dark body color and aggressive nature of fish. 相似文献
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