Expect the unexpected: a new species of killifish from a highly stochastic temporary wetland near Iguaz ú Falls (Cyprinodontiformes: Rivulidae)
We describe Argolebias adrianae, a new species of killifish from a small temporary wetland in the Paran á Forest ecoregion with no regular or predictable temporal pattern of water availability. This habitat is in the Lower Iguazú River Basin, known for its high fish endemism, but until now, only two species of Rivulidae were reported from it, but from the Araucarian Forest ecoregion. The genus Argol ebias was previously only known from the lower portions of the Paraguay, Paraná, and Uruguay basins and middle Paraná. The new species is distinguished from all congeners by its unique coloration, which includes a conspicuo...
Source: Canadian Journal of Zoology - March 1, 2024 Category: Zoology Authors: Felipe Alonso Guillermo Enrique Ter án Pablo Calvi ño Wilson Sebasti án Serra Alanís Martin Miguel Montes Ignacio Daniel Garc ía Jorge Adri án Barneche Liliana Ciotek Pablo Giorgis Jorge Casciotta Source Type: research
John Donald ( “JD”) McPhail (1934–2023)
Canadian Journal of Zoology, Ahead of Print. (Source: Canadian Journal of Zoology)
Source: Canadian Journal of Zoology - January 8, 2024 Category: Zoology Authors: E.B. Taylor T.W. Pietsch Source Type: research
Note of appreciation
Canadian Journal of Zoology,Volume 102, Issue 1, Page i-i, January 2024. (Source: Canadian Journal of Zoology)
Source: Canadian Journal of Zoology - January 1, 2024 Category: Zoology Source Type: research
Variation in body condition of moose calves in regions with contrasted winter conditions and tick loads
Canadian Journal of Zoology, Ahead of Print. For many mammals living at higher latitudes, food scarcity and snow-hindered movements associated with their first winter are synonymous of trying months. In addition, most wild animals have to cope with parasites. Many studies have been conducted on captive animals to assess consequences parasitism on health over winter, but comparable studies on wild populations are scarce for large mammals. Here, we performed winter tick (Dermacentor albipictus Packard, 1869) counts and collected body condition data (mass and hematological parameters) on 15 moose (Alces alces (Linnaeus, 1758)...
Source: Canadian Journal of Zoology - December 11, 2023 Category: Zoology Authors: Delphine De Pierre Patrick Leighton Steeve D. C ôté Jean-Pierre Tremblay Source Type: research
Estimating the effects of roads on migration: a barren-ground caribou case study
Canadian Journal of Zoology, Ahead of Print. A challenge for management of wildlife species is the assessment of the effect of roads on migration. We developed models to estimate the spatial (zone of influence (ZOI)) and temporal (delays in migration) effects of roads, and test whether road closures reduced delays in migration. We analyzed collar (2011 –2019) and road survey data from two barren-ground caribou (Rangifer tarandus groenlandicus (Borowski, 1780)) herds to assess the impact of a 171 km mine road that bisects their migration corridor. We estimated ZOIs of 16–17 km prior to crossing the road during 2018 ...
Source: Canadian Journal of Zoology - December 8, 2023 Category: Zoology Authors: John Boulanger Robin Kite Mitch Campbell Jason Shaw David Lee Stephen Atkinson Source Type: research
Over-winter body mass and conceptions of white-tailed deer in central Texas
Canadian Journal of Zoology, Ahead of Print. At lower latitudes ungulate reproduction is often seasonal, but the duration of mating and parturition seasons can be long. To further understand the adaptive significance of synchrony in reproductive events, we examined two hypotheses to link over-winter body mass with lower synchrony of conceptions in a wild population of white-tailed deer (Odocoileus virginianus (Zimmermann, 1780)) in central Texas. If females maintain over-winter body mass, then the window of time that conception occurs should be relaxed and longer relative to females where over-winter body mass declines. Ac...
Source: Canadian Journal of Zoology - December 5, 2023 Category: Zoology Authors: F.W. Weckerly R. Reitz D. Pfeffer Source Type: research
Signalling pathway associated with discharge of cnidocyst induced by reduced glutathione in Hydra plagiodesmica (Dioni, 1968)
Canadian Journal of Zoology, Ahead of Print. In the present work, we study the effect of different stimuli (living preys, its homogenate, and reduced glutathione (GSH)) on the discharge of desmonemes in the freshwater cnidarian, Hydra plagiodesmica (Dioni, 1968) (Cnidaria: Hydrozoa). Once confirmed their stimulatory effect, we choose GSH to analyze the relevance of Ca2+, the probable identity of the sensory receptor molecule, and the specific signalling pathway driving the discharge mechanism. Our results show that not only mechanical, but also chemical stimuli by itself may stimulate the discharge of desmonemes. Using cal...
Source: Canadian Journal of Zoology - December 2, 2023 Category: Zoology Authors: Mar ía Victoria Gavazzi Jorge Rafael Ronderos Mar ía Eugenia Alzugaray Source Type: research
Spatial patterns of anticoagulant rodenticides in three species of medium-sized carnivorans in Pennsylvania
Canadian Journal of Zoology, Ahead of Print. Human influences on natural environments are now ubiquitous but manifest in multiple and unique ways depending on local environments and communities. Attempts to control, or mediate, local pests to residences or to agriculture can impart important negative consequences on systems. Secondary exposure to anticoagulant rodenticides (ARs) can cause numerous adverse effects on wild carnivores including death. Few studies have quantified AR prevalence, investigated their pathway of exposure, or associations with specific location types in the northeastern U.S. We hypothesized that ARs...
Source: Canadian Journal of Zoology - November 30, 2023 Category: Zoology Authors: Aaron Facka Jacqueline Frair Thomas Keller Erica Miller Lisa Murphy Julie C. Ellis Source Type: research
Selection effects on early life history traits and thermal resistance in brook charr Salvelinus fontinalis
Canadian Journal of Zoology, Ahead of Print. In the context of climate change, it is crucial to understand whether animals that have been domesticated and (or) selected maintain their abilities to adapt to changes in their thermal environment. Here, we tested how selection for absence of early sexual maturation combined with better growth performance may have impacted thermal resistance and gene expression response in the presence of thermal stress in brook charr Salvelinus fontinalis (Mitchill, 1814). We performed temperature challenge tests on brook charr 0+ juveniles and studied the expression of genes involved in the...
Source: Canadian Journal of Zoology - November 24, 2023 Category: Zoology Authors: Cl émence Gourtay Marine Rivolet L éopold Ghinter Louis Bernatchez Dany Garant C éline Audet Source Type: research
Effect of resource supplementation on female Western Rattlesnake postpartum movement
We examined body condition and movement of snakes, finding that pregnant rattlesnakes consumed supplemented resources until late parturition and had significantly higher postpartum body condition than controls. Contrary to our expectations, increased access to resources ad libitum did not significantly halt or alter postpartum movements away from hibernacula. These results suggest that resource availability influences certain life-history traits such as body condition but not others like postpartum movement. (Source: Canadian Journal of Zoology)
Source: Canadian Journal of Zoology - November 23, 2023 Category: Zoology Authors: Dana M. Eye Jade A. Spruyt Marcus C.P. Atkins Christine A. Bishop Karl W. Larsen Source Type: research
Preface to Festschrift honouring the contributions of Professor M. Brock Fenton to the study of bats
Canadian Journal of Zoology, Ahead of Print. (Source: Canadian Journal of Zoology)
Source: Canadian Journal of Zoology - November 17, 2023 Category: Zoology Authors: Paul A. Faure Gary P. Bell John M. Ratcliffe Source Type: research
Energetic costs of mounting an immune response in a coral reef damselfish (Pomacentrus amboinensis)
Canadian Journal of Zoology, Ahead of Print. While immune responses can be energetically costly, quantifying these costs is challenging. We tested the metabolic costs of immune activation in damselfish (Pomacentrus amboinensis Bleeker, 1868) following a mass-adjusted injection of lipopolysaccharide (LPS) endotoxin. Fish were divided into eight treatments: two controls (handling and saline injection) and six LPS groups with concentrations ranging from 3 to 100 mg kg−1. We used intermittent flow respirometry to measure differences in oxygen uptake (deltaṀO2) 20 h before versus 20 h after LPS injection and changes in ...
Source: Canadian Journal of Zoology - November 15, 2023 Category: Zoology Authors: Marie Levet Dominique G. Roche Shaun S. Killen Simona Colosio Redouan Bshary Joanna J. Miest Sandra A. Binning Source Type: research
The individual color pattern on the back of Bufotes viridis balearicus (Boettger, 1880) allows individual photo-identification recognition for population studies
This study explores the potential of photo-identification methods (PIMs) as a viable, non-invasive, and ethical tool for wildlife studies, with a specific focus on anuran species such as Bufotes viridis balearicus (Boettger, 1880). Although the automatic photo-identification suite (APHIS) software was initially designed for lizard identification, our research shows its adaptability for anuran species, achieving a high detection accuracy rate of 95.28%, thus obtaining outstanding and higher values in compared to previous studies on this species. Crucially, our findings indicate that the success of PIM and the efficacy of im...
Source: Canadian Journal of Zoology - November 15, 2023 Category: Zoology Authors: Nil Lassnig Sergi Guasch-Mart ínez Samuel Pinya Source Type: research
Diet flexibility in three harvester ants (Pogonomyrmex spp.): effects of grazing and natural variations in the availability of seeds
Canadian Journal of Zoology, Ahead of Print. The study of diet and its relationship with available resources allows us to evaluate how species that differ in their degree of ecological flexibility respond to natural and anthropogenic variations that affect food availability. In the central Monte desert, extensive cattle ranching reduces the abundance of grass seeds, the most consumed and preferred food by the harvester ants Pogonomyrmex inermis Forel, 1914, Pogonomyrmex mendozanus (Cuezzo& Claver, 2009), and Pogonomyrmex propinqua (Johnson, 2021). We studied the diet of these species in grazed and ungrazed habitats ove...
Source: Canadian Journal of Zoology - November 10, 2023 Category: Zoology Authors: M.F. Miretti R.G. Pol L. Vullo A.L. Cao L. Marone J. Lopez de Casenave Source Type: research
Variation in spatiotemporal activity may reduce competitive interactions between invasive wild pigs (Sus scrofa) and native mammal species
Canadian Journal of Zoology, Ahead of Print. Interactions between sympatric species influence the ecology and behaviour of individuals and species. Invasive species can often alter community dynamics by generating novel pressures that native species are less able to respond to. The scope of these pressures may depend on the ecology and life history of the invasive species. We used remote camera traps to investigate how native mammals ’ spatiotemporal activity patterns were altered by the presence of invasive wild pig (Sus scrofa Linnaeus, 1758). By analyzing patterns of daily activity and implementing Cox proportional ha...
Source: Canadian Journal of Zoology - November 6, 2023 Category: Zoology Authors: B.M. Carswell S.P. Boyle R.K. Brook F.M. van Beest E. Vander Wal Source Type: research
