7 documents found, page 1 of 1
Diving into the vertical dimension of elasmobranch movement ecology
Andrzejaczek, Samantha; Lucas, Tim C. D.; Goodman, Maurice C.; Hussey, Nigel E.; Armstrong, Amelia J.; Carlisle, Aaron; Coffey, Daniel M.Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understand their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on horizontal movements. Our study addresses the knowledge gap of vertical movements by compiling the first global synthesis of vertical habitat use by elasmobranchs from data o...
Mercury biomagnification in a Southern Ocean food web
Seco, José; Aparício, Sara; Brierley, Andrew S.; Bustamante, Paco; Ceia, Filipe R.; Coelho, João P.; Philips, Richard A.; Saunders, Ryan A.Biomagnification of mercury (Hg) in the Scotia Sea food web of the Southern Ocean was examined using the stable isotope ratios of nitrogen (d15N) and carbon (d13C) as proxies for trophic level and feeding habitat, respectively. Total Hg and stable isotopes were measured in samples of particulate organic matter (POM), zooplankton, squid, myctophid fish, notothenioid fish and seabird tissues collected in two year...
Global Connectivity of Southern Ocean Ecosystems
Murphy, Eugene J.; Johnston, Nadine M.; Hofmann, Eileen E.; Phillips, Richard A.; Jackson, Jennifer A.; Constable, Andrew J.; Henley, Sian F.Southern Ocean ecosystems are globally important. Processes in the Antarctic atmosphere, cryosphere, and the Southern Ocean directly influence global atmospheric and oceanic systems. Southern Ocean biogeochemistry has also been shown to have global importance. In contrast, ocean ecological processes are often seen as largely separate from the rest of the global system. In this paper, we consider the degree of e...
Productivity and Change in Fish and Squid in the Southern Ocean
Caccavo, Jilda Alicia; Christiansen, Henrik; Constable, Andrew J.; Ghigliotti, Laura; Trebilco, Rowan; Brooks, Cassandra M.; Cotte, CédricSouthern Ocean ecosystems are globally important and vulnerable to global drivers of change, yet they remain challenging to study. Fish and squid make up a significant portion of the biomass within the Southern Ocean, filling key roles in food webs from forage to mid-trophic species and top predators. They comprise a diverse array of species uniquely adapted to the extreme habitats of the region. Adaptations su...
Age and growth of Brauer's lanternfish Gymnoscopelus braueri and rhombic lanter...
Saunders, Ryan A.; Lourenço, Sílvia; Vieira, Rui P.; Collins, Martin A.; Assis, Carlos A.; Xavier, Jose C.This study examines age and growth of Brauer's lanternfish Gymnoscopelus braueri and rhombic lanternfish Krefftichthys anderssoni from the Scotia Sea in the Southern Ocean, through the analysis of annual growth increments deposited on sagittal otoliths. Otolith pairs from 177 G. braueri and 118 K. anderssoni were collected in different seasons from the region between 2004 and 2009. Otolith‐edge analysis suggest...
Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae
Seco, José; Xavier, José C.; Bustamante, Paco; Coelho, João P.; Saunders, Ryan A.; Ferreira, Nicole; Fielding, Sophie; Pardal, Miguel A.Myctophids are the most abundant fish group in the Southern Ocean pelagic ecosystem and are an important link in the Antarctic marine food web. Due to their major ecological role, evaluating the level of mercury (Hg) contamination in myctophids is important as a step towards understanding the trophic pathway of this contaminant. The concentrations of total Hg were determined in muscle, gill, heart and liver tis...
Life cycle, distribution and trophodynamics of the lanternfish Krefftichthys an...
Lourenço, Sílvia; Saunders, Ryan A.; Collins, Martin; Shreeve, Rachel; Assis, Carlos; Belchier, Mark; Watkins, Jonathan L.; Xavier, JoseMyctophid fish play an important role in the Southern Ocean pelagic food web. The lanternfish Krefftichthys anderssoni is one of the most common myctophids in the region, but its ecology is poorly known. This study examines spatial and temporal patterns in the species distribution of density, life cycle, population structure and diet using samples collected by mid-water trawl nets deployed in different seasons ...