Zobrazeno 1 - 10
of 179
pro vyhledávání: '"John F Steffensen"'
Autor:
Julius Nielsen, Rasmus B Hedeholm, Arve Lynghammar, Leon M McClusky, Bjørn Berland, John F Steffensen, Jørgen S Christiansen
Publikováno v:
PLoS ONE, Vol 15, Iss 10, p e0238986 (2020)
The Greenland shark (Somniosus microcephalus, Squaliformes: Somniosidae) is a long-lived Arctic top predator, which in combination with the high historical and modern fishing pressures, has made it subject to increased scientific focus in recent year
Externí odkaz:
https://doaj.org/article/a1018739ce5b4ba6abad08424dc63532
Publikováno v:
PLoS ONE, Vol 8, Iss 1, p e54345 (2013)
In watersheds of equatorial West Africa, monophyletic groups of killifish species (genus Aphyosemion) occur in discrete altitudinal ranges, low altitude species (LA, sea level to ∼350 m) or high altitude species (HA, 350 to 900 m). We investigated
Externí odkaz:
https://doaj.org/article/4e836a98b6a449038bc3de996d645cca
Publikováno v:
PLoS ONE, Vol 8, Iss 1, p e54033 (2013)
Underwater locomotion is challenging due to the high friction and resistance imposed on a body moving through water and energy lost in the wake during undulatory propulsion. While aquatic organisms have evolved streamlined shapes to overcome such res
Externí odkaz:
https://doaj.org/article/8239dee2a9df4a61a3f5bdd5d2f896d8
Publikováno v:
PLoS ONE, Vol 6, Iss 6, p e20797 (2011)
Pop-up satellite archival tags (PSATs) have recently been applied in attempts to follow the oceanic spawning migration of the European eel. PSATs are quite large, and in all likelihood their hydraulic drag constitutes an additional cost during swimmi
Externí odkaz:
https://doaj.org/article/e63798653d0340e29e809ffc529a1508
Publikováno v:
Biology, Vol 8, Iss 4, p 89 (2019)
Changes in environmental salinity challenge fish homeostasis and may affect physiological performance, such as swimming capacity and metabolism, which are important for foraging, migration, and escaping predators in the wild. The effects of salinity
Externí odkaz:
https://doaj.org/article/8561118cf5ec444983a5f5fc5afd590a
Publikováno v:
Oecologia. 196:363-371
Increasing ocean temperatures and the resulting poleward range shifts of species has highlighted the importance of a species preferred temperature and thermal range in shaping ecological communities. Understanding the temperatures preferred and avoid
Autor:
Andrew S. Hoey, Jacob L. Johansen, Jodie L. Rummer, John F. Steffensen, Connor R. Gervais, Rohan J Longbottom, Tiffany J. Nay
Publikováno v:
Journal of Fish Biology. 98:723-732
Highly variable thermal environments, such as coral reef flats, are challenging for marine ectotherms and are thought to invoke the use of behavioural strategies to avoid extreme temperatures and seek out thermal environments close to their preferred
Publikováno v:
Journal of Fish Biology. 97:794-803
The present study determined the effect of body mass and acclimation temperature (15-28°C) on oxygen consumption rate (ṀO2 ) and the size dependency of preferred temperature in European perch Perca fluviatilis. Standard metabolic rate (SMR) scaled
Autor:
Lars Juel Andersen, Emil A. F. Christensen, Heiðrikur Bergsson, Shaun S. Killen, John F. Steffensen
Publikováno v:
Conservation Physiology
Christensen, E A F, Andersen, L E J, Bergsson, H, Steffensen, J F & Killen, S S 2021, ' Shuttle-box systems for studying preferred environmental ranges by aquatic animals ', Conservation Physiology, vol. 9, no. 1, coab028 . https://doi.org/10.1093/conphys/coab028
Christensen, E A F, Andersen, L E J, Bergsson, H, Steffensen, J F & Killen, S S 2021, ' Shuttle-box systems for studying preferred environmental ranges by aquatic animals ', Conservation Physiology, vol. 9, no. 1, coab028 . https://doi.org/10.1093/conphys/coab028
Preferred environmental ranges of aquatic animals can be estimated in so-called shuttle boxes. Here, we review the past 50 years use of shuttle boxes and synthesize the current methodological state-of-art. We also suggest directions for future studie
Autor:
Caroline Methling, Paolo Domenici, John F. Steffensen, Jon Christian Svendsen, Bjørn Tirsgaard, Gerardo A. Cordero
Publikováno v:
Journal of Experimental Zoology Part A: Ecological and Integrative Physiology. 331:577-586
Many vertebrate animals employ anaerobic pathways during high-speed exercise, even if it imposes an energetic cost during postexercise recovery, expressed as excess postexercise oxygen consumption (EPOC). In ectotherms such a fish, the initial anaero