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24 results for “Limnetic”
Fig. 1 in The Composition, Diversity And Community Dynamics Of Limnetic Zooplankton In A Tropical Caldera Lake (Lake Taal, Philippines)
Fig. 1. Map of Lake Taal with the six sampling sites (NB – North Basin, SB – South Basin). The insert shows the location of Lake Taal and the other lakes mentioned in the text (P – Lake Paoay, Lb – Lake Laguna de Bay, N – Lake Naujan and Ln – Lake Lanao).
Fig. 4 in The Composition, Diversity And Community Dynamics Of Limnetic Zooplankton In A Tropical Caldera Lake (Lake Taal, Philippines)
Fig. 4. Monthly variations in Shannon-Wiener Diversity (H') Index values of rotifers and cladocerans in the north and south basins of Lake Taal.
Fig. 3 in The Composition, Diversity And Community Dynamics Of Limnetic Zooplankton In A Tropical Caldera Lake (Lake Taal, Philippines)
Fig. 3. Mean monthly biomass (μg / l) of common zooplankton species from the north and south basins of Lake Taal for the year 2008.
Fig. 2 in Surviving at the edge of land: finding of the limnetic snail Sibirenauta sibirica (Gastropoda: Physidae) on the coast of the Laptev Sea (Eastern Siberia)
Fig. 2. Shell and anatomy of Sibirenauta sibirica, Tyulahk-Kuel Lake. A – shell, B – body extracted from the shell, C – copulatory apparatus, D, E – female reproductive system. A–D – organs of the same specimen. ag – albumen gland, bc – bursa copulatrix, с – caecum, o – oviduct, v – vagina. Scale bars: 5 mm (A–B), 2 mm (C–E).
Fig. 1 in Surviving at the edge of land: finding of the limnetic snail Sibirenauta sibirica (Gastropoda: Physidae) on the coast of the Laptev Sea (Eastern Siberia)
Fig. 1. Collecting sites of Sibirenauta sibiraca. A – Tyulahk-Kuel Lake, B – small pool on the coast of Tiksi Bay. Photographs by A. Nekhaeva.
Collective behavior evolves independently of benthic-limnetic divergence in stickleback
<p>Comparing populations across replicate environments or habitat types can help us understand the role of ecology in evolutionary processes. If similar phenotypes are favored in similar environments, parallel evolution may occur. Collective behavior, including collective movement (e.g., schooling, flocking) and social networks, can play a key role in the adaptation by animals to different environments. However, studies exploring the parallelism of collective behavior are limited, with research traditionally focusing on morphological traits. Here, we asked if collective behavior has evolved in parallel across replicate populations of benthic and limnetic three-spined stickleback (Gasterosteus aculeatus). There were repeatable, population-level differences in collective behavior in a common garden, with some populations forming groups that were more cohesive and with higher strength and clustering coefficients. This suggests that collective behavior can evolve. However, these differences were not predicted by ecotype (benthic vs. limnetic). We found no evidence that boldness or morphological traits – both of which are known to be associated with benthic-limnetic divergence – were correlated with collective behavior. Together, these results suggest that while collective behavior evolves in this system, it does not co-evolve with divergence along the benthic-limnetic axis.</p>
Linked collectors and determiners for: Fauna and flora inventories (terrestrial and limnetic) from the South of Belgium.
Natural history specimen data linked to collectors and determiners held within, "Fauna and flora inventories (terrestrial and limnetic) from the South of Belgium". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/b848583a-a47b-4d09-a58b-46d3236b3d10">https://bionomia.net/dataset/b848583a-a47b-4d09-a58b-46d3236b3d10</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/b848583a-a47b-4d09-a58b-46d3236b3d10">https://gbif.org/dataset/b848583a-a47b-4d09-a58b-46d3236b3d10</a>. Formatted as a Frictionless Data package.
Repeated parallel differentiation of social learning differences in benthic and limnetic threespine stickleback fish
<p>Individuals can reduce sampling costs and increase foraging efficiency by using information provided by others. One simple form of social information use is delayed local enhancement, or increased interest in a location because of the past presence of others. We tested for delayed local enhancement in two ecomorphs of stickleback fish, benthic and limnetic, from three different lakes with putative independent evolutionary origins. Two of these lakes have reproductively isolated ecomorphs ('species-pairs'), whereas in the third a previously intact species-pair recently collapsed into a hybrid swarm. Benthic fish in both intact species-pair lakes were more likely to exhibit delayed local enhancement despite being more solitary than limnetic fish. Their behaviour and morphology suggest their current perceived risk and past evolutionary pressure from predation did not drive this difference. In the hybrid swarm lake, we found a reversal in patterns of social information use, with limnetic-looking fish showing delayed local enhancement rather than benthic-looking fish. Together, our results strongly support parallel differentiation of social learning differences in recently evolved fish species, although hybridization can apparently erode and possibly even reverse these differences.</p>
Collective behavior diverges independently of the benthic-limnetic axis in stickleback
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Data from: Repeated parallel differentiation of social learning differences in benthic and limnetic threespine stickleback fish
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Data from: The genomic signature of ecological divergence along the benthic-limnetic axis in allopatric and sympatric threespine stickleback
<p>The repeated occurrence of similar phenotypes in independent lineages (i.e., parallel evolution) in response to similar ecological conditions can provide compelling insights into the process of adaptive evolution. An intriguing question is to what extent repeated phenotypic changes are underlain by repeated changes at the genomic level and whether patterns of genomic divergence differ with the geographic context in which populations evolve. Here, we combine genomic, morphological and ecological datasets to investigate the genomic signatures of divergence across populations of threespine stickleback (<i>Gasterosteus aculeatus</i>) that adapted to contrasting ecological niches (benthic or limnetic) in either sympatry or allopatry. We found that genome-wide differentiation (F<sub>ST</sub>) was an order of magnitude higher and substantially more repeatable for sympatric benthic and limnetic specialists compared to allopatric populations with similar levels of ecological divergence. We identified genomic regions consistently differentiated between sympatric ecotypes that were also differentiated between or associated with benthic vs. limnetic niche in allopatric populations. These candidate regions were enriched on three chromosomes known to be involved in the benthic-limnetic divergence of threespine stickleback. Some candidate regions overlapped with QTL for body shape and trophic traits such as gill raker number, traits that strongly differ between benthic and limnetic ecotypes. In sum, our study shows that magnitude and repeatability of genomic signatures of ecological divergence in threespine stickleback highly depend on the geographic context. The identified candidate regions provide starting points to identify functionally important genes for the adaptation to benthic and limnetic niches.</p>
Data from: The genomic signature of ecological divergence along the benthic-limnetic axis in allopatric and sympatric threespine stickleback
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FIGURE 92. Caecum limnetes. A in A Rosetta Stone for eastern Pacific Caecidae (Gastropoda: Caenogastropoda)
FIGURE 92. Caecum limnetes. A. Conceptual reconstruction of growth stages. B. Species distribution map.
FIGURE 90. Caecum limnetes. A in A Rosetta Stone for eastern Pacific Caecidae (Gastropoda: Caenogastropoda)
FIGURE 90. Caecum limnetes. A. Profile view with periostracum (LACM 1968-14.31). B. Profile view of smooth form without periostracum (LACM 1968-14.31). C. Profile view of ribbed form without periostracum (LACM 1968-14.31). D. Ventral view (SBMNH 114904). E. Operculum, exterior surface (SBMNH 114904). F. Operculum, interior surface (SBMNH 114904). G. Paratype, LACM 1446.
Figure 7 in Morphological, ontogenetic, and molecular investigations of freshwater hypotrich ciliates from China revealed a new genus Heterodeviata gen. nov. (Protista: Ciliophora), and a novel limnetic population of Deviata multilineae
Figure 7. Deviata multilineae from life (A–I) and asser protargol impregnation (J–N). A, F, ventral view of a representative individual, arrowhead in (F) marks the algae in the cell. B–D, G, H, ventral views of different cells, arrowheads indicate contractile vacuole. E, ventral view, showing the detail of cirri and their surrounded globules. I, denoting the macronuclear nodules and the cytoplasm. J, K, N, ventral (J, N) and dorsal (K) view of the same representative cell, showing infraciliature and nuclear apparatus, arrowhead in (J) marks the buccal cirrus, arrows and arrowheads in (K, N) indicate macronuclear nodules and micronuclei, respectively. L, dorsal view to show the less marginal rows on dorsal side. M, ventral view, arrowhead indicates buccal cirrus. 1–3, dorsal kineties 1–3; E, endoral; FC, frontal cirri; FVR1–3, frontoventral cirral rows 1–3; LMR, less marginal row; Ma, macronuclear nodules; P, paroral; PBC, parabuccal cirri; RMR, right marginal row. Scale bars: 50 μm.
Figure 8 in Morphological, ontogenetic, and molecular investigations of freshwater hypotrich ciliates from China revealed a new genus Heterodeviata gen. nov. (Protista: Ciliophora), and a novel limnetic population of Deviata multilineae
Figure 8. Nucleotide differences between deviatids based on 18S rRNA gene sequences. In (A), the lower less values of the table indicate the sequence similarity, the upper right numbers are numbers of nucleotide differences. The numbers in the header (B) indicate the unmatched site positions. In A, B, the newly obtained sequences are in red. '**' indicates the sequence Perisincirra sp. (KY855575) which was likely misidentified and can be considered conspecific with Deviata brasiliensis. 'H', Heterodeviata.
Figure 5 in Morphological, ontogenetic, and molecular investigations of freshwater hypotrich ciliates from China revealed a new genus Heterodeviata gen. nov. (Protista: Ciliophora), and a novel limnetic population of Deviata multilineae
Figure 5. Morphogenetic process of Heterodeviata sinica asser protargol impregnation. A, showing the oral primordium of the opisthe. B, ventral view of a very early divider, showing oral primordium of the opisthe (arrowhead). C–E, ventro-lateral (C, D) and dorsolateral (E) views of the same early divider, in this stage, anlagen I–IV (C), two right marginal anlagen (E) formed, adoral zone of membranelles incompletely formed (arrowhead in C), and arrowhead in (D) shows the parental endoral beginning to disintegrate. F, G, ventral (F) and dorsal (G) views of two middle dividers, arrowheads in (G) showing dorsal kinety anlage 2. H, I, ventral (H) and dorsal view (I) of two middle dividers, in this stage, anlagen I–IV dedifferentiating into cirri (H), and two bristles of dorsal kinety 2 formed (arrowheads in H, I). J, dorsal view of a late divider, showing one macronuclear nodule dedifferentiated into two ones. K, L, ventral views of two late dividers, arrowheads in (K) and (L) indicate the buccal and parabuccal cirrus, separately. I–IV, anlagen I–IV; DK1, dorsal kinety 1; DḎ1, dorsal kinety anlage 1; FVR, frontoventral cirral row; LMA1, 2, less marginal anlagen 1, 2; LMR1, 2, less marginal rows 1, 2; Ma, macronuclear nodules; Mi, micronuclei; OP, oral primordium; RMA1, 2, right marginal anlagen 1, 2; RMR1, 2, right marginal rows 1, 2; UM, undulating membranes. Scale bars: 50 μm (F, L), 20 μm (G, I).
Figure 1 in Morphological, ontogenetic, and molecular investigations of freshwater hypotrich ciliates from China revealed a new genus Heterodeviata gen. nov. (Protista: Ciliophora), and a novel limnetic population of Deviata multilineae
Figure 1. Location of the sampling site. A, map showing the location of the Lake Weishan Wetland, China. B, C, photographs of the Lake Weishan where Heterodeviata sinica and Deviata multilineae were collected, respectively.
Figure 9 in Morphological, ontogenetic, and molecular investigations of freshwater hypotrich ciliates from China revealed a new genus Heterodeviata gen. nov. (Protista: Ciliophora), and a novel limnetic population of Deviata multilineae
Figure 9. Comparison of Heterodeviata with related genera within Deviatidae and Kahllidae that possess three frontal cirri, at least one short or long frontal ventral cirral row right of the cell midline, at least one less marginal row, and one dorsomarginal kinety. Figures in the upper and lower row show the dorsal kinety paưern and cirral paưern of corresponding genera, respectively. Old (parental) structures (marginal cirri or dorsal kineties) are depicted by contour. Abbreviations: BC, buccal cirri; CC, caudal cirri; DK, dorsal kinety; FC, frontal cirri; FVR, frontoventral cirral row; LMR, less marginal row; PBC, parabuccal cirri; RMR, right marginal row; TC, transverse cirri.
Figure 4 in Morphological, ontogenetic, and molecular investigations of freshwater hypotrich ciliates from China revealed a new genus Heterodeviata gen. nov. (Protista: Ciliophora), and a novel limnetic population of Deviata multilineae
Figure 4. Early to middle morphogenetic stages of Heterodeviata sinica asser protargol impregnation. A, macronuclear nodules of a very early divider (ventral view), showing replication band of macronuclear nodules (arrows). B, oral primordium of the opisthe (arrow). C, developed oral primordia (arrow). D–F, ventrolateral (D, E) and dorsolateral (F) view of the same early divider, showing incomplete adoral zone of membranelles (arrow in D, E), the intrakinetally formed marginal anlagen and dorsal kinety anlage 1. G, H, ventral (G) and dorsal (H) view of the same early-middle divider, showing the dorsal kinety 2 anlage formed to the right of the right marginal anlage 2. I, J, ventral (I) and dorsal (J) view of the same middle divider, denoting anlagen I–IV differentiating into cirri, arrowhead in (I) shows the parabuccal cirrus. DḎ1, 2, dorsal kineties anlagen 1, 2; FC, frontal cirri; FVR, frontoventral cirral row; LMA1, 2, less marginal anlagen 1, 2; Ma, macronuclear nodules; Mi, micronuclei; RMA1, 2, right marginal anlagen 1, 2; UMA, undulating membrane anlage. Scale bars: 20 μm (A–C), 50 μm (D–J).
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Allen Brain Atlas
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OpenNeuro
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