D. Andreou results 17
· Newest (Page 1/1, per page 25)
Author: D. Andreou ×Clear All Filters
Search Results
Winter involves long periods of low water temperatures, with the activities and movements of many temperate fish species being reduced compared with summer. In very cold periods, individuals can become winter quiescent. The extent to which the activities and movements of many fish species reduce in winter is unknown, including how these decrease in relation to environmental conditions. Acoustic biotelemetry was applied here to...
Variability in the summer movements, habitat use and thermal biology of two fish species in a temperate riverNARA Subscribed
The ability of fish to cope with warm water temperatures in summer depends on factors including their thermal traits and the ability of individuals to access cool-water refugia. Knowledge is highly limited on the in situ responses of many fishes to elevated summer temperatures, including whether they express behavioural thermoregulation. The responses of two riverine species to summer water temperatures were tested here using...
Biological invasions pose a rapidly expanding threat to the persistence, functioning and service provisioning of ecosystems globally, and to socio‐economic interests. The stages of successful invasions are driven by the same mechanism that underlies adaptive changes across species in general—via natural selection on intraspecific variation in traits that influence survival and reproductive performance (i.e., fitness). Surprisi...
There is limited knowledge of how philopatry influences the spatial ecology of iteroparous anadromous species during their spawning migrations, but this knowledge is important in understanding population responses to interventions such as river reconnection. Here, acoustic telemetry was applied to twaite shad Alosa fallax and hybrids ( n = 184) during their freshwater spawning migration, enabling quantification of philopatry a...
Low microplastic loads in riverine European eel ( Anguilla anguilla ) from southwest England during their marine–freshwater transitionNARA Subscribed
The microplastic loads in elvers of the critically endangered European eel Anguilla anguilla , sampled in the lower reaches of three English rivers, were very low (incidence: 3.3%, mean ± s.d. : 0.03 ± 0.18 particles) and did not vary with body length or between rivers. Particles were mostly black, polyolefins, fibres and fragments of size 101–200 μm. Current levels indicate a low contamination pressure locally and, consequent...
Microplastics (MPs) are small, plastic particles of various shapes, sizes and polymers. Although well studied in marine systems, their roles and importance in freshwater environments remain uncertain. Nevertheless, the restricted ranges and variable traits of freshwater fishes result in their communities being important receptors and strong bioindicators of MP pollution. Here, the current knowledge on MPs in freshwater fishes...
Laboratory and field validation of a simple method for detecting four species of non‐native freshwater fish using eDNANARA Subscribed
This paper presents the first phase in the development and validation of a simple and reliable environmental (e) DNA method using conventional PCR to detect four species of non‐native freshwater fish: pumpkinseed Lepomis gibbosus , sunbleak Leucaspius delineatus , fathead minnow Pimephales promelas and topmouth gudgeon Pseudorasbora parva . The efficacy of the approach was demonstrated in indoor tank (44 l) trials in which all...
Individual genetic tagging for teleosts: an empirical validation and a guideline for ecologistsNARA Subscribed
The efficiency of individual genetic tagging was determined by using passive integrated transponders (PIT) as a comparative conventional tagging method. Fifty‐five common dace Leuciscus leuciscus were captured in the wild, PIT tagged and fin clipped (for DNA analysis). Thirty fish were recaptured on three occasions and tissue samples were collected. Using 18 microsatellite loci, 79–94% of the recaptures were correctly assigned...
Previous1Next