Results 11 to 20 of about 374 (150)

Testicular Morphology and Spermatogenesis in Potamotrygon motoro: Insights Into Reproduction of Freshwater Stingrays. [PDF]

J Morphol
Electron microscopy of Potamotrygon motoro spermatozoa. a – Illustration of a schematic sperm cell depicting the helical head, intermediate piece (midpiece), and flagellum. b ‐ Helical heads (Hh) of spermatozoa inserted into the cytoplasm of Sertoli cells (S) through openings in the plasma membrane. Scales: 10 μm.
Delgado MLR, Quirino PP, Gomes-Silva L, Dzyuba V, Dzyuba B, Ninhaus-Silveira A, Veríssimo-Silveira R.   +6 more
europepmc   +2 more sources

3D Electron Microscopy Reveals the Structural Complexity of the Intravacuolar Membranous Network in Cyrilia lignieresi-Infected Erythrocytes of the Fish Synbranchus marmoratus. [PDF]

J Eukaryot Microbiol
ABSTRACT This study employs advanced three‐dimensional electron microscopy techniques, including Transmission Electron Microscopy (TEM) tomography and freeze‐fracture imaging via scanning electron microscopy (SEM), to investigate the ultrastructural organization of Cyrilia lignieresi‐infected red blood cells (iRBCs) in the host fish Synbranchus ...
Fachetti BS, Turiel-Silva M, Wendt C, Costi HT, da Silva EO, Rodrigues APD, de Souza W, Miranda K, Diniz JAP.   +8 more
europepmc   +2 more sources

Integrating invasive species risk assessment into environmental DNA metabarcoding reference libraries. [PDF]

Ecol Appl, 2023
Abstract Environmental DNA (eDNA) metabarcoding has shown promise as a tool for estimating biodiversity and early detection of invasive species. In aquatic systems, advantages of this method include the ability to concurrently monitor biodiversity and detect incipient invasions simply through the collection and analysis of water samples.
Mahon AR, Grey EK, Jerde CL.
europepmc   +2 more sources

Cryopreservation of Potamotrygon Stingrays’ Semen: Enhancing One Conservation Effort

Journal of Zoological and Botanical Gardens
This pioneering study aimed to evaluate the cryopreservation of semen from P. falkneri (n = 4) and P. motoro (n = 4), maintained ex situ at the Sao Paulo Aquarium, Brazil.
Sofia Dressel Ramos, Pedro Nacib Jorge-Neto, Helen Colbachini, Emanuele Almeida Gricio, Fábio de Moraes Francisco, Fabiana Lucia André Padilha, Rafael Caprioli Gutierrez, Letícia Alecho Requena, Laura Chrispim Reisfeld, Paloma Canedo Henrique, Roberta Ferreira Leite, Cristiane Schilbach Pizzutto   +11 more
doaj   +2 more sources

Evolution of reproductive modes in sharks and rays

Journal of Evolutionary Biology, Volume 36, Issue 11, Page 1630-1640, November 2023., 2023
The evolution of reproductive modes in sharks, rays, and chimaeras. Abstract The ecological and life history drivers of the diversification of reproductive modes in early vertebrates are not fully understood. Sharks, rays and chimaeras (group Chondrichthyes) have an unusually diverse variety of reproductive modes and are thus an ideal group to test the
Gergely Katona, Flóra Szabó, Zsolt Végvári, Tamás Székely Jr, András Liker, Robert P. Freckleton, Balázs Vági, Tamás Székely   +7 more
wiley   +1 more source

Social learning in non‐grouping animals

Biological Reviews, Volume 98, Issue 4, Page 1329-1344, August 2023., 2023
ABSTRACT Social learning is widespread in the animal kingdom and is involved in behaviours from navigation and predator avoidance to mate choice and foraging. While social learning has been extensively studied in group‐living species, this article presents a literature review demonstrating that social learning is also seen in a range of non‐grouping ...
Mike M. Webster
wiley   +1 more source

Use of underwater contactless ultrasonography to elucidate the internal anatomy and reproductive activity of manta and devil rays (family: Mobulidae)

Journal of Fish Biology, Volume 103, Issue 2, Page 305-323, August 2023., 2023
Abstract The ability to visualise the internal anatomical structures of fish provides important information on their reproductive status and body condition and has made important contributions to many areas of fish biology. Obtaining information on the internal anatomy of fish has traditionally required euthanasia and dissection.
Niv Froman, Marie‐Aude Genain, Guy M. W. Stevens, Gareth P. Pearce   +3 more
wiley   +1 more source

A comparison of staff presence and signage on zoo visitor behavior

Zoo Biology, Volume 42, Issue 3, Page 407-415, May/June 2023., 2023
The presence of uniformed zoo staff reduced negative behaviors by zoo visitors more effectively than signage. Abstract Many zoos favor the use of signage to encourage learning and positive visitor experiences as well as discourage negative behaviors by visitors because of its simplicity, relatively low maintenance needed, and low cost. However, current
Claudia Tay, Todd J. McWhorter, Shangzhe Xie, Tiara Sophia Binte Mohd Nasir, Borja Reh, Eduardo J. Fernandez   +5 more
wiley   +1 more source

The link between wildlife trade and the global donkey skin product network

Conservation Science and Practice, Volume 4, Issue 6, June 2022., 2022
The global donkey skin trade is a newly prevalent and lucrative business, largely driven by Chinese demand for E‐Jiao, a traditional medicine derived from donkey skins. Our study is a novel investigation of the alleged links between the trade of wildlife and donkey skins. We identified at least 13 groups of CITES‐listed species in the densely connected
Shan Su, Ewan A. Macdonald, Maurice Beseng, Felipe Thomaz, David W. Macdonald   +4 more
wiley   +1 more source

Comparing the performance of 12S mitochondrial primers for fish environmental DNA across ecosystems

Environmental DNA, Volume 3, Issue 6, Page 1113-1127, November 2021., 2021
We propose a framework for comparing the performance of primer pairs, which we applied to the comparison of two fish eDNA primer pairs, teleo and MiFish‐U. We showed how those primer pairs could be best used together to increase diversity coverage of eDNA studies.
Andrea Polanco F., Eilísh Richards, Benjamin Flück, Alice Valentini, Florian Altermatt, Sébastien Brosse, Jean‐Claude Walser, David Eme, Virginie Marques, Stéphanie Manel, Camille Albouy, Tony Dejean, Loïc Pellissier   +12 more
wiley   +1 more source