Results 71 to 80 of about 10,224 (211)

Feeding and vertical migration of the chaetognath Sagitta friderici (Ritter Zahony, 1911) in the southern Benguela during spring 1987, with notes on seasonal variability of feeding ecology [PDF]

open access: yes, 1994
The feeding biology and the vertical migration of Sagitta friderici were examined over 24 h at two stations in the southern Benguela during spring (October) 1987.
Gibbons, Mark J., Stuart, V.
core   +1 more source

Ecologic Traits Analysis for Identifying Rodent Hosts for Arenavirus and Hepacivirus in the Americas

open access: yesBiotropica, Volume 57, Issue 6, November 2025.
Over half of emerging human pathogens originate from wildlife, with rodents serving as key zoonotic hosts. This study used ecological trait‐based models to identify rodent traits associated with arenavirus and hepacivirus infections and detect potential host species across the Americas, our models achieve high predictive accuracy (AUC = 0.92–0.96).
María del Carmen Villalobos‐Segura   +3 more
wiley   +1 more source

Ontogenetic and sex-related variations in otolith morphology and structure of thinlip gray mullet from a transitional environment in northern Italy

open access: yesFrontiers in Marine Science
Otoliths are calcified structures present in the inner ear of fish involved in hearing and balance. Notwithstanding that their shape is species-specific, which is helpful for taxonomic identification, the intraspecific variability of shape and structures
Francesca De Witt   +10 more
doaj   +1 more source

Fourier-based contour descriptors to relax positional standardization of the otolith images in AFORO queries

open access: yesScientia Marina, 2020
The otolith digital catalogue AFORO allows unknown otoliths to be classified automatically by using a comparison with its classified records. To do this, the otolith’s contour, which is extracted from an image, is used.
Pere Marti-Puig   +2 more
doaj   +1 more source

Changes in utilization of canal crossing structures by desert mammal communities during the COVID‐19 lockdown

open access: yesEcological Solutions and Evidence, Volume 6, Issue 4, October–December 2025.
We investigated desert mammals' utilization of canal wildlife crossing structures (WCSs) in Xinjiang, China, employing COVID‐19 lockdowns as a natural experiment to evaluate anthropogenic disturbance effects. Camera trap data for four focal species revealed shifts in encounter rates, activity patterns, and predator‐prey interactions across pandemic ...
Weibo Wang   +9 more
wiley   +1 more source

A web-based environment for shape analysis of fish otoliths. The AFORO database

open access: yesScientia Marina, 2006
We present an automatic system for describing and identifying fish otolith shapes combining information technologies with modern advances in signal analysis.
Antoni Lombarte   +5 more
doaj   +1 more source

The Size and The Shape of Sagittal Otolith of Redtail Scad, Decapterus kurroides Blekeer 1855 from Kema Bay, North Minahasa Regency, North Sulawesi, Indonesia

open access: yesOmni-Akuatika, 2020
This study aimed to examine the difference in the otolith size and otolith shape of redtail scad Decapterus kurrodes between sex in North Sulawesi. The otoliths of D.
Fransine B Manginsela   +3 more
doaj   +1 more source

Sagitta, Lenses, and Maximal Volume [PDF]

open access: yesThe Journal of Geometric Analysis, 2015
We give a characterization of critical points that allows us to define a metric invariant on all Riemannian manifolds $M$ with a lower sectional curvature bound and an upper radius bound. We show there is a uniform upper volume bound for all such manifolds with an upper bound on this invariant.
openaire   +3 more sources

Otolith‐based species identification in the killifish Aphaniops (Teleostei; Cyprinodontiformes; Aphaniidae) using both morphometry and wavelet analysis

open access: yesActa Zoologica, Volume 106, Issue 3, Page 291-308, July 2025.
Abstract The killifish genus Aphaniops consists of nine species distributed in Eastern Africa and the Middle East. However, distinguishing these species from each other based on morphological traits is challenging. Here we investigate the utility of otoliths (sagittae) in distinguishing between A. dispar, A. ginaonis, A. hormuzensis, A.
Eleni A. Charmpila   +2 more
wiley   +1 more source

Accurate Transfer Maps for Realistic Beamline Elements: Part I, Straight Elements

open access: yes, 2010
The behavior of orbits in charged-particle beam transport systems, including both linear and circular accelerators as well as final focus sections and spectrometers, can depend sensitively on nonlinear fringe-field and high-order-multipole effects in the
A. J. Dragt   +7 more
core   +2 more sources

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