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694 results for “fish diversity”
FIGURE 3 in Description of two new Labeo (Labeoninae; Cyprinidae) endemic to the Lulua River in the Democratic Republic of Congo (Kasai ecoregion); a hotspot of fish diversity in the Congo basin
FIGURE 3. Simplified phylogram of subclade K modified after Liyandja et al. (2022) showing placement of L. mbimbii, n. sp., and L. manasseeae, n. sp. (in bold).
FIGURE 9. A in Description of two new Labeo (Labeoninae; Cyprinidae) endemic to the Lulua River in the Democratic Republic of Congo (Kasai ecoregion); a hotspot of fish diversity in the Congo basin
FIGURE 9. A. Labeo luluae, holotype (ANSP 51740). B. Labeo lugubris, holotype (AMNH 12334). Scale bars = 1 cm.
Documenting Reef-Fish Diversity in the Revillagigedo Archipelago, Pacific Mexico, November 2022
<p>Documenting Reef-Fish Diversity in the Revillagigedo Archipelago, Pacific Mexico, November 2022</p> <p>By Allison Morgan Estape, Citizen Scientist</p> <p>150 Nautilus Drive Islamorada, Florida 33036, USA. Email: <a href="mailto:allison.carlos@me.com">allison.carlos@me.com</a>. </p> <p>Photographic Website: <a href="https://carlosestape.photoshelter.com/gallery-list">https://carlosestape.photoshelter.com/gallery-list</a>.</p> <p>Between November 20 and December 2, 2022, a group of seven professional ichthyologists from Mexico, Panama and the USA, together with 11 SCUBA-diving photographers experienced in taking diagnostic images of reef-fishes, conducted a scientific expedition aboard the diving-support vessel Quino El Guardian to the Revillagigedo Archipelago, a Mexican Marine Protected Area that lies 250 miles south-southwest of the tip of Baja California. The objectives of the expedition were (1) to photograph all observed species of reef-fishes in their natural habitat at each of the archipelago’s four islands to provide permanent documentation of such species occurrences; and (2) to collect specimens for museums in Mexico and the United States at which they would be used for morphological and genetic assessments of endemism in the archipelagos’ reef-fish fauna and the general relationships of that fauna to the reef-fish fauna of Mexico and other parts of the Tropical Eastern Pacific. This video of a power-point show provides a visual record of the expedition and summarizes the results by island and the expedition’s overall findings to date.</p>
Changes in vertical and horizontal diversities mediated by the size structure of introduced fish collectively shape food-web stability
<p><span>Species introductions can alter local food-web structure by changing the vertical or horizontal diversity within communities, largely driven by their body size distributions. Increasing vertical and horizontal diversities is predicted to have opposing effects on stability. However, their interactive effects remain largely overlooked. We investigated the independent and collective effects of vertical and horizontal diversities on food-web stability</span><span> in alpine lakes stocked with variable body size distributions of introduced fish species. I</span><span>ntroduced predators destabilize food-webs by </span><span>increasing vertical diversity through food chain lengthening</span><span>. Alternatively, increasing horizontal diversity results in more </span><span>stable food-web topologies. A non-linear interaction between vertical and horizontal diversities </span>suggests that increasing vertical diversity is most destabilizing when horizontal diversity is low<span>.</span> <span>Our findings suggest </span>that the size structure of introduced predators drives their impacts on stability by modifying the structure of food-webs, and highlights the <span>interactive effects of vertical and horizontal diversities on stability.</span></p>
Data for: Optimizing a metabarcoding marker portfolio for species detection from complex mixtures of globally diverse fishes
<p>DNA metabarcoding is used to enumerate and identify taxa in both environmental samples and tissue mixtures, but the effectiveness of particular markers depends on their sensitivity to the taxa involved. Using multiple primer sets that amplify different genes can mitigate biases in amplification efficiency, sequence resolution, and reference data availability, but few empirical studies have evaluated markers for complementary performance. Here, we assess the individual and joint performance of 22 markers for detecting species in a DNA pool of 98 species of marine and freshwater bony fishes from geographically and phylogenetically diverse origins. We find that a portfolio of four markers targeting 12S, 16S, and two regions of COI identifies 100% of reference taxa to family and nearly 60% to species. We then use these four markers to evaluate metabarcoding of heterogeneous tissue mixtures, using experimental fishmeal to test: 1) the tissue input threshold to ensure detection; 2) how read depth scales with tissue abundance; and 3) the effect of non-target material in the mixture on recovery of target taxa. We consistently detect taxa that make up >1% of fishmeal mixtures and can detect taxa at the lowest input level of 0.01%, but rare taxa (<1%) were detected inconsistently across markers and replicates. Read counts showed only a weak correlation with tissue input, suggesting they are not a reliable quantitative proxy for relative abundance. Despite the limitations arising from primer specificity and reference data availability, our results demonstrate that a modest portfolio of markers can perform well in detecting and identifying aquatic species in complex mixtures despite heterogeneity in tissue representation, phylogenetic affinities, and from a broad geographic range.</p>
Figure 5 in A review of amphidromous freshwater fishes of the Chocó biogeographical region (Colombia and Ecuador): diversity, ecology, fisheries and conservation
Figure 5. – Representative habitat of freshwater amphidromous fishes in western of Colombia. A: photo of Valle River, 20 m collection site; B: Photo of Aguaclara River (Anchicayá Basin), 70 m collection site; C: Representative habitat in which post-larval Awaous transandeanus, Hemieleotris latifasciata, Hemieleotris levis and Sicydium spp. were collected in western Colombia. Photo of San Juan River, 18 m collection site; D: Type locality of Sicydium hildebrandi, photo of Dagua River in Cisneros, 350 m collection site.
Data for: Fish feces reveal diverse nutrient sources for coral reefs
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Data from: Functional diversity shapes the stability of reef fish biomass under global change
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Examining the diversity, stability and functioning of marine fish communities across a latitudinal gradient
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Patterns of functional diversity along latitudinal gradients of species richness in eleven fish families
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Species ecology explains the various spatial components of genetic diversity in tropical reef fishes
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Global patterns of nuclear and mitochondrial genetic diversity in marine fishes
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Convergence of undulatory swimming kinematics across a diversity of fishes
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Data from: Metagenomic insights into the dietary diversity of the adaptive radiation of cichlid fishes in Lake Tanganyika
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Weak integration allows novel fin shapes and spurs locomotor diversity in reef fishes
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Major changes in fish thermal habitat diversity in Canada’s Arctic lakes due to climate change
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Genotype and genetic diversity data for: Contrasts in riverscape patterns of intraspecific genetic variation in a diverse Neotropical fish community of high conservation value
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Sponge presence increases the diversity and abundance of fish and invertebrates in a subtropical seagrass bed
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Changes in vertical and horizontal diversities mediated by the size structure of introduced fish collectively shape food-web stability
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Functional beta diversity of New Zealand fishes: characterising morphological turnover along depth and latitude gradients, with derivation of functional bioregions
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International Brain Laboratory public data
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