Biology: Recent submissions
Now showing items 81-100 of 228
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Temperature-mediated outbreak dynamics of the invasive bryozoan Membranipora membranacea in Nova Scotian kelp beds
(2009)We used underwater videography to examine seasonal and interannual patterns in the cover (on kelp) of the encrusting epiphytic bryozoan Membranipora membranacea, and associated changes in the structure and abundance of ... -
Herbivory and community organization on a subtidal cobble bed
(2009)We examined the role of molluscan mesograzers (periwinkles Littorina littorea, limpets Testudinalia testudinalis and chitons Ischnochiton ruber) in mediating macroalgal succession after a mass mortality of sea urchins ... -
Recurrent outbreaks of disease in sea urchins Strongylocentrotus droebachiensis in Nova Scotia: Evidence for a link with large-scale meteorologic and oceanographic events
(1997-06)Recurrent outbreaks of a disease (paramoebiasis, caused by a marine amoeba Paramoeba invadens) result in mass mortalities of sea urchins Strongylocentrotus droebachiensis in the rocky subtidal zone of the Atlantic coast ... -
Competitive interactions between the invasive green alga Codium fragile ssp tomentosoides and native canopy-forming seaweeds in Nova Scotia (Canada)
(2006)Two concurrent 2 yr experiments were conducted along the Atlantic coast of Nova Scotia (1) to examine competitive interactions between the invasive green alga Codium fragile ssp. tomentosoides and canopy-forming native ... -
Disease outbreaks associated with recent hurricanes cause mass mortality of sea urchins in Nova Scotia
(2010)Field observations and laboratory experiments support the hypothesis that disease-induced mass mortality of the sea urchin Strongylocentrotus droebachiensis can be associated with hurricane events that introduce a ... -
Community Dynamics on a Subtidal Cobble Bed Following Mass Mortalities of Sea Urchins
(1990)The macrobenthic community of a shallow subtidal cobble bed at Eagle Head on the Atlantic coast of Nova Scotia [Canada] was monitored from ca 4 mo before to 41 mo after mass mortalities of sea urchins Strongylocentrotus ... -
Genomic islands of divergence and their consequences for the resolution of spatial structure in an exploited marine fish
(2013-04)As populations diverge, genomic regions associated with adaptation display elevated differentiation. These genomic islands of adaptive divergence can inform conservation efforts in exploited species, by refining the ... -
Historical changes in genotypic frequencies at the Pantophysin locus in Atlantic cod (Gadus morhua) in Icelandic waters: evidence of fisheries-induced selection?
(2011-07)The intense fishing mortality imposed on Atlantic cod in Icelandic waters during recent decades has resulted in marked changes in stock abundance, as well as in age and size composition. Using a molecular marker known to ... -
Contemporary effective population and metapopulation size (Ne and meta-Ne): comparison among three salmonids inhabiting a fragmented system and differing in gene flow and its asymmetries
(2013-03)We estimated local and metapopulation effective sizes ((N) over cap (e) and meta-(N) over cap (e)) for three coexisting salmonid species (Salmo salar, Salvelinus fontinalis, Salvelinus alpinus) inhabiting a freshwater ... -
Food-Web Structure of Seagrass Communities across Different Spatial Scales and Human Impacts
(2011-07)Seagrass beds provide important habitat for a wide range of marine species but are threatened by multiple human impacts in coastal waters. Although seagrass communities have been well-studied in the field, a quantification ... -
A Meta-Analysis of Community Response Predictability to Anthropogenic Disturbances
(2012-09)Disturbances often lead to changes in average values of community properties; however, disturbances can also affect the predictability of a community's response. We performed a meta-analysis to determine how response ... -
A Meta-Analysis of Probiotic Efficacy for Gastrointestinal Diseases
(2012-04)Background: Meta-analyses on the effects of probiotics on specific gastrointestinal diseases have generally shown positive effects on disease prevention and treatment; however, the relative efficacy of probiotic use for ... -
Maintenance of Positive Diversity-Stability Relations along a Gradient of Environmental Stress
(2010-04)Background: Environmental stress is widely considered to be an important factor in regulating whether changes in diversity will affect the functioning and stability of ecological communities. Methodology/Principal Findings: ... -
Reciprocal Subsidies and Food Web Pathways Leading to Chum Salmon Fry in a Temperate Marine-Terrestrial Ecotone
(2010-04)Stable isotope analysis was used to determine the relative proportions of terrestrial and marine subsidies of carbon to invertebrates along a tidal gradient (low-intertidal, mid-intertidal, high-intertidal, supralittoral) ... -
Influence of Hypoxia and Adrenaline Administration on Coronary Blood-Flow and Cardiac-Performance in Seawater Rainbow-Trout (Oncorhynchus-Mykiss)
(1994-08)To investigate the relationship between cardiac performance and coronary perfusion, cardiovascular variables (Q, Vs, fH, PDA) and coronary blood flow (q(cor)) were measured in rainbow trout (Oncorhynchus mykiss) (1.2-1.6 ... -
The burrow microhabitat of the land crab Cardisoma guanhumi: Respiratory/ionic conditions and physiological responses of crabs to hypercapnia
(1993)Cardisoma guanhumi in Puerto Rico spend much of the dry season in burrows that descend to groundwater. Burrows are sometimes 3-4 m deep and may be capped with dried mud for over 3 mo. Samples of gas and water from burrows ... -
Oxygen transport in egg masses of the amphibians Rana sylvatica and Ambystoma maculatum: Convection, diffusion and oxygen production by algae
(1994)Many amphibians lay their eggs in gelatinous masses up to 10-20 cm in diameter, posing problems for diffusive oxygen delivery. Oxygen may also be provided by water convection between eggs or by oxygen production by endogenous ... -
The respiratory development of Atlantic salmon .1. Morphometry of gills, yolk sac and body surface
(1996-12)During development from larva to juvenile in Atlantic salmon, Salmo salar, there is a change in the anatomical potential for gas exchange among gills, body skin and yolk sac as the larvae resorb yolk, grow and develop ... -
The respiratory development of Atlantic salmon: II. Partitioning of oxygen uptake among gills, yolk sac and body surfaces
(1996)During post-hatch development of Atlantic salmon (Salmo salar L.), O-2 uptake partitioning changes from primarily cutaneous to primarily branchial. Over 80% of post-hatch O-2 uptake was cutaneous, with the yolk sac responsible ...