Results 1 to 10 of about 265,540 (300)
Variability in abundance of temperate reef fishes estimated by visual census. [PDF]
PLoS ONE, 2013 Identifying sources of sampling variation and quantifying their magnitude is critical to the interpretation of ecological field data. Yet, most monitoring programs of reef fish populations based on underwater visual censuses (UVC) consider only a few of ...
Alejo J Irigoyen +3 more
doaj +6 more sources
Comparison of Environmental DNA Metabarcoding and Underwater Visual Census for Assessing Macrobenthic Diversity [PDF]
BiologyThe rapid advancement of environmental DNA (eDNA) technology has transformed ecological research, particularly in aquatic ecosystems. However, the optimal sampling matrix (e.g., water or sediment) and the potential for eDNA to replace or complement ...
Zifeng Zhan +6 more
doaj +4 more sources
Fine-Grained Car Detection for Visual Census Estimation
Proceedings of the AAAI Conference on Artificial Intelligence, 2017 Targeted socioeconomic policies require an accurate understanding of a country's demographic makeup. To that end, the United States spends more than 1 billion dollars a year gathering census data such as race, gender, education, occupation and ...
Chen, Duyun +5 more
core +2 more sources
Quaternary Census Transform Based on the Human Visual System for Stereo Matching [PDF]
IEEE Access, 2020 The census transform is a non-parametric local transform that is widely used in stereo matching. This transform encodes the structural information of a local patch into a binary code stream representing the relative intensity ordering of the pixels ...
Seowon Ji +4 more
doaj +2 more sources
Performance of transect and point count underwater visual census methods [PDF]
Ecological Modelling, 1997 A simulation approach was used to study bias and variability of density estimates of fish using the transect and point count underwater visual census methods. Three experiments were conducted to examine the effects of fish density, sampling effort, and the speed of fish in relation to the observer. Fish density and sampling effort did not significantly
Reg A Watson
exaly +2 more sources
Littoral fish community of the Island Lampedusa (Italy): A visual census approach [PDF]
Italian Journal of Zoology, 1998 Abstract Fish community structure of the Island Lampedusa, with a special focus on the fish assemblage inhabiting the infralittoral rocky substrate, was studied from July to October 1995. Visual census techniques (strip transects and random censuses) and the application of an anaesthetic (quinaldine), to sample cryptic and benthic species, were used. A
Carlotta Mazzoldi, Mirko De Girolamo
exaly +2 more sources
Environmental DNA, 2021 Environmental DNA (eDNA) analysis is a revolutionary method to monitor marine biodiversity from animal DNA traces. Examining the capacity of eDNA to provide accurate biodiversity measures in species‐rich ecosystems such as coral reefs is a prerequisite ...
Andrea Polanco Fernández +17 more
doaj +2 more sources
Journal of Marine Science and Engineering, 2023 Fish aggregating devices (FADs) are used worldwide to attract fish. Previous studies revealed that FADs affect the distribution and dispersal patterns of juvenile fish species during their life stage under floating objects. In this study, we hypothesised
Mauro Sinopoli +3 more
doaj +1 more source
Animals, 2023 The presence of spiny butterfly rays, Gymnura altavela, in waters less than 20 m deep off the Canary Islands shows marked seasonality, with relatively high abundances in the summer and autumn.
Ana Espino-Ruano +6 more
doaj +1 more source
Comparison of fish assemblages recorded by visual census and video census
Revista de Biología Tropical, 2022 Introduction: Underwater visual censuses are the basis of many studies on fish ecology, however, a series of limitations and errors influence the traditional visual estimation of fish richness and abundance. Video techniques have been proposed to mitigate such errors, but there are few studies that compare the effectiveness of both methods.
Luis Gibran Juárez-Hernández +1 more
openaire +2 more sources