NEW! "Evaluating Changes in Diadromous Species Distributions and Habitat Accessibility following the Penobscot River Restoration Project" by Tara R. Trinko Lake, Kyle R. Ravana & Rory Saunders (2012) Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science Volume 4, Issue 1
Abstract: The Penobscot River basin, covering approximately 22,265 km2, is the largest river wholly within Maine and the second largest river system in New England. The Penobscot River Restoration Project (PRRP) is a multimillion-dollar endeavor that aims to restore native sea-run fish through the removal of two main-stem dams and improved fish passage at a third dam on the Penobscot River. We used geographical information systems, accounts of historic ranges, and barrier survey data to estimate species-specific distributions and habitat accessibility for 11 diadromous species before and after the proposed restoration. We predict a range of outcomes in terms of expected distribution and accessibility that are largely based on habitat use and life history differences. For 4 out of 11 species (Atlantic sturgeon Acipenser oxyrinchus, shortnose sturgeon A. brevirostrum, Atlantic tomcod Microgadus tomcod, and striped bass Morone saxatillis), the PRRP is anticipated to provide access to 100% of their historic freshwater habitat.......
“Population viability management: ecological standards to guide adaptive management for rare species” by
Victoria J Bakker and Daniel F Doak. (2009) Front Ecol Environ 2008; 7, doi:10.1890/070220
Abstract: Many approaches to rare species management formulated by academics lack practicality and meaning for managers. Here, we propose an approach, which we refer to as population viability management (PVM), that is based on linking monitoring and management models with population models. By closely coordinating biological analyses with the range of decisions and actions considered by managers, the PVM approach ensures that population models reflect realistic management options and risk tolerances, and that adaptive conservation systems remain focused on population viability rather than statistical targets indirectly tied to population persistence. We summarize our use of PVM to formulate draft recovery criteria for the endangered island fox and to generate specific guidance for conserving this species. We argue that PVM can be widely adapted to provide more biologically justified and focused management and monitoring recommendations than those typically emerging from conventional population viability analyses. Overall, PVM represents an effective and understandable tool that enables managers to optimize monitoring effort and better control risk for species of concern.
NEW! “Habitat Selection and Overlap of Atlantic Salmon and Smallmouth Bass Juveniles in Nursery Streams” by Gus Wathen, Stephen M. Coghlan Jr., Joseph Zydlewski & Joan G. Trial (2011): Transactions of the American Fisheries Society, 140:5, 1145-1157
Abstract: Introduced smallmouth bass Micropterus dolomieu have invaded much of the historic freshwater habitat ofAtlantic salmon Salmo salar in North America, yet little is known about the ecological interactions between the two species.We investigated the possibility of competition for habitat between age-0 Atlantic salmon and age-0 and age-1 smallmouth bass by means of in situ observations and a mesocosm experiment.We used snorkel observation to identify the degree and timing of overlap in habitat use in our in situ observations and to describe habitat shifts by Atlantic salmon in the presence of smallmouth bass in our mesocosm experiments. In late July 2008, we observed substantial overlap in the depths and mean water column velocities used by both species in sympatric in situ conditions and an apparent shift by age-0 Atlantic salmon to shallower water that coincided with the period of high overlap.
NEW! “Effects of Smallmouth Bass on Atlantic Salmon Habitat Use and Diel Movements in an Artificial Stream” by Gus Wathen, Joseph Zydlewski, Stephen M. Coghlan Jr. & Joan G. Trial (2012)Transactions of the American Fisheries Society, 141:1, 174-184
Abstract: Invasive smallmouth bass Micropterus dolomieu have been introduced to some of the last remaining watersheds that contain wild anadromous Atlantic salmon Salmo salar, yet little is known about the interactions between these species. We used an artificial stream equipped with passive integrated transponder tag antenna arrays to monitor habitat use and movements of age-0 Atlantic salmon and age-0 smallmouth bass in sympatry and allopatry. We used additive and substitutive designs to test for changes in habitat use, diel movements, and diel activity patterns of prior-resident Atlantic salmon or smallmouth bass resulting from the addition of conspecifics or heterospecifics. Atlantic salmon prior residents did not change their habitat use in the presence of conspecific or heterospecific invaders.
Distribution and Abundance of Anadromous Sea Lamprey Spawners in a Fragmented Stream: Current Status and Potential Range Expansion Following Barrier Removal Cory Gardner, Stephen M. Coghlan, Jr.and Joseph Zydlewski. 2012 Northeastern Naturalist19(1):99–110
Abstract - Dams fragment watersheds and prevent anadromous fi shes from reaching historic spawning habitat. Sedgeunkedunk Stream, a small tributary to the Penobscot River (Maine), has been the focus of efforts to reestablish marine-freshwater connectivity and restore anadromous fi shes via the removal of two barriers to fish migration. Currently,Petromyzon marinus (Sea Lamprey) is the only anadromous fish known to spawn successfully in the stream downstream of the lowermost dam.
Environmental Contaminants inShortnose Sturgeon (Acipenser brevirostrum) From Bears Bluff National Fish Hatchery,Wadmalaw Island, South Carolina.
Mierzykowski S.E. 2012.
USFWS. Spec. Proj. Rep. FY09‐MEFO‐9‐EC. Maine Field Office. Orono, ME. 23 pp.
The shortnose sturgeon (Acipenser brevirostrum) is a federally‐listed endangered species. In 2008, eleven shortnose sturgeon, reared at the Bears Bluff National Fish Hatchery in Wadmalaw, South Carolina, were analyzed to determine environmental contaminant burdens. The sturgeon were divided into five, year‐class specific, composite samples and analyzed for 21 organochlorine compounds and 19 trace metals. Three whole‐body fish from the 1.5 year age class were composited and analyzed as a single sample. Skinless, boneless fillets of fish from four older age classes – 2.5 through 5.5 ‐ were also analyzed.
Contaminants in Atlantic Sturgeon and Shortnose SturgeonRecovered from the Penobscot and Kennebec Rivers, Maine Mierzykowski S.E. 2012. USFWS. Spec. Proj. Rep. FY09‐MEFO‐3‐EC. Maine Field Office. Orono, ME. 50 pp.
In the Gulf of Maine, the shortnose sturgeon (Acipenser brevirostrum) is a federally‐listed endangered species and the Atlantic sturgeon (Acipenser oxyrinchus) is a recently listed threatened species. Between June and August 2006, six sturgeon were collected from the Penobscot River in Maine ‐ two Atlantic sturgeon and three shortnose sturgeon died during scientific sampling activities and one shortnose sturgeon was killed by a seal. In July 2009, three shortnose sturgeon were recovered on the Kennebec River in Georgetown after a red tide event. A month later two more shortnose sturgeon were recovered further north in the Kennebec River near Phippsburg; apparent victims of seal predation.
Abrupt Climate Regime Shifts, Their PotentialForcing and Fisheries Impacts
Alfred M. Powell Jr.1, Jianjun Xu2*Atmospheric and Climate Sciences, 2011, 1, 33-47http://www.scirp.org/journal/PaperInformation.aspx?paperID=4556
Abstract: The purpose of this paper is to investigate whether a logical chain of events can be established to explain the abrupt climatic regime shift changes in the Pacific that link the atmosphere to the ocean to fisheries impacts. The investigation endeavors to identify synchronous abrupt changes in a series of data sets to establish the feasibility of abrupt of climate change often referred to as regime shifts. The study begins by using biological (fish catch/stock) markers to mathematically identify the dates of abrupt change.
Intra-population variability of life-history traits and growth during range expansion of the invasive round goby, Neogobius melanostomus. L. F. G. Gutowsky and M. G. Fox. 2012. Fisheries Management and Ecology 19:78–88. http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2400.2011.00831.x/abstract
Abstract Fish can undergo changes in their life-history traits that correspond with local demographic conditions. Under range expansion, a population of non-native fish might then be expected to exhibit a suite of life-history traits that differ between the edge and the centre of the population’s geographic range. To test this hypothesis, life-history traits of an expanding population of round goby, Neogobius melanostomus (Pallas), in early and newly established sites in the Trent River (Ontario, Canada) were compared in 2007 and 2008.
A predictive model for
estimating river habitat area using GIS-derived catchment and river
P. McGinnity, E. De Eyto, J. Gilbey, P. Gargan, W. Roche, T. Stafford,
M. McGarrigle, N. Ó Maoiléidigh, P. Mills. 2012. Fisheries Management and Ecology 19:69–77.
Abstract The implementation of many fisheries management-related activities in fresh water depends on habitat area inventories over extensive geographical scales. While river lengths are readily available, representative widths, necessary for area calculations, are difficult to obtain. As field surveys to collect this information are resource intensive, a predictive model was developed to enable the calculation of river wetted width using GIS-derived values for catchment and river descriptors.
Variation in wind and piscivorous
predator fields affecting the survival of Atlantic salmon, Salmo salar,
in the Gulf of Maine. K. D. Friedland, J. P. Manning, J. S. Link, J. R. Gilbert, A. T.
Gilbert, A. F. O’Connell Jr. 2012. Fisheries Management and Ecology 19:22–35.
Abstract Observations relevant to the North American stock complex of Atlantic salmon, Salmo salar L., suggest that marine mortality is influenced by variation in predation pressure affecting post-smolts during the first months at sea. This hypothesis was tested for Gulf of Maine (GOM) stocks by examining wind pseudostress and the distribution of piscivorous predator fields potentially affecting post-smolts. Marine survival has declined over recent decades with a change in the direction of spring winds, which is likely extending the migration of post-smolts by favouring routes using the western GOM.
Increased frequency of low-magnitude floods in New England by
William H. Armstrong, Mathias J. Collins, and Noah P. Snyder. 2011.
Journal of the American Water Resources Association,
American Water Resources Association
ABSTRACT: Recent studies document increasing precipitation and streamflow in the northeastern United
States throughout the 20th and early 21st Centuries. Annual peak discharges have increased over this period on many New England rivers with dominantly natural streamflow – especially for smaller, more frequent floods. To better investigate high-frequency floods (<5-year recurrence interval), we analyze the partial duration flood series for 23 New England rivers selected for minimal human impact.
Environmental Contaminants in Fillets of Sea‐runAtlantic Salmon (Salmo salar) from the Gulf of Maine Distinct Population Segment by Mierzykowski S.E. 2011. USFWS. Spec. Proj. Rep. FY09‐MEFO‐8‐EC. Maine Field Office. Orono, ME. 50 pp.
single fish were recovered from the Narraguagus and Dennys rivers.
ABSTRACT: After a long history of overexploitation, increasing efforts to restore marine ecosystems and rebuild fisheries are under way. Here, we analyze current trends from a fisheries and conservation perspective. In 5 of 10 well-studied ecosystems, the averageexploitation rate has recently declined and is now at or below the rate predicted to achieve maximum sustainable yield for seven systems. Yet 63% of assessed fish stocks worldwide still require rebuilding, and even lower exploitation rates are needed to reverse the collapse of vulnerable species.
Distribution and Abundance of Stream Fishes in Relation to Barriers: Implications for Monitoring Stream Recovery after Barrier Removal by Gardner et al. 2011. River Research and Applications. doi: 10.1002/rra.1572
ABSTRACT Dams are ubiquitous in coastal regions and have altered stream habitats and the distribution and abundance of stream fishes in those habitats by disrupting hydrology, temperature regime and habitat connectivity. Dam removal is a common restoration tool, but often the response of the fish assemblage is not monitored rigorously. Sedgeunkedunk Stream, a small tributary to the Penobscot River (Maine, USA), has been the focus of a restoration effort that includes the removal of two low-head dams.
Water chemistry and its effects on the physiology and survival of Atlantic salmon Salmo salar smolts. (2011) by Liebich et al. Journal of Fish Biology 79, 502–519
Abstract. The physiological effects of episodic pH fluctuations on Atlantic salmon Salmo salar smolts in eastern Maine, U.S.A., were investigated. During this study, S. salar smolts were exposed to ambient stream-water chemistry conditions at nine sites in four catchments for 3 and 6 day intervals during the spring S. salar smolt migration period. Plasma chloride, plasma glucose, gill aluminium and gill Na+- and K+-ATPase levels in S. salar smolts were assessed in relation to ambient stream-water chemistry during this migration period.
Rates and processes of channel response to dam removal with a sand-filled impoundment
by Adam J. Pearson, Noah P. Snyder, and Mathias J. Collins. 2011. WATER RESOURCES RESEARCH, VOL. 47, W08504, 15 PP.
Abstract. Dam removal projects are playing an increasingly important role in stream restoration, and offer unparalleled opportunities to study sediment dynamics following disturbance. We used the removal of the ∼4-m high Merrimack Village Dam (MVD) on the Souhegan River in southern New Hampshire to measure processes and rates of channel evolution in a sand-filled impoundment. From 2007 to 2010, we repeatedly surveyed 11 cross sections and the longitudinal profile, and collected sediment samples to measure changes in channel morphology and bed texture.
Role of origin and release location in pre-spawning distribution and movements of anadromous alewife By H. J. Frank et al. Fisheries Management and Ecology Volume 18, Issue 1, pages 12–24, February 2011
Abstract Capturing adult anadromous fish that are ready to spawn from a self sustaining population and transferring them into a depleted system is a common fisheries enhancement tool. The behaviour of these transplanted fish, however, has not been fully evaluated. The movements of stocked and native anadromous alewife, Alosa pseudoharengus (Wilson), were monitored in the Ipswich River, Massachusetts, USA, to provide a scientific basis for this management tool. Radiotelemetry was used to examine the effect of origin (native or stocked) and release location (upstream or downstream) on distribution and movement during the spawning migration. Native fish remained in the river longer than stocked fish regardless of release location.
Chesapeake Bay Watershed Pesticide Use Declines But Toxicity Increases by Hartwell Environ. Toxicol. Chem. 2011 30:1223–1231.
Abstract: Large areas of the Chesapeake Bay, USA, watershed are in agricultural land use, but there is no baywide program to track application rates of current-use pesticides in any of the watershed jurisdictions. Watershed studies demonstrate that several pesticides are present in surface and groundwater throughout the region. Between 1985 and 2004, the Maryland Department of Agriculture conducted surveys to estimate pesticide application within the state. Application rates of the dominant insecticides and herbicides were compiled over the survey period.
A Lidar-Derived Evaluation of Watershed-Scale Large Woody Debris Sources and Recruitment Mechanisms: Coastal Maine, USA (2011) by A. Kasprak, F. J. Magilligan, K. H. Nislow, N. P. Snyder. 2011. River Research and Applications, 27: n/a. doi: 10.1002/rra.1532
Abstract: In-channel large woody debris (LWD) promotes quality aquatic habitat through sediment sorting, pool scouring and in-stream nutrient retention and transport. LWD recruitment occurs by numerous ecological and geomorphic mechanisms including channel migration, mass wasting and natural tree fall, yet LWD sourcing on the watershed scale remains poorly constrained.
Survival variability and population density in fish populations by Coilín Minto, Ransom A. Myers, & Wade Blanchard. Nature 452, 344-347 (20 March 2008)
Abstract: To understand the processes that regulate the abundance and persistence of wild populations is a fundamental goal of ecology and a prerequisite for the management of living resources. Variable abundance data, however, make the demonstration of regulation processes challenging. A previously overlooked aspect in understanding how populations are regulated is the possibility that the pattern of variability—its strength as a function of population size—may be more than ‘noise’, thus revealing much about the characteristics of population regulation.
Prospects for sustaining freshwater biodiversity in the 21st century: linking ecosystem structure and function. by David Dudgeon.Current Opinion in Environmental Sustainability Volume 2, Issues 5-6, December 2010, Pages 422-430
Abstract: Biodiversity in freshwater ecosystems is under grave threat from human activities, due to the combined effects of multiple stressors such as pollution and habitat degradation, flow regulation, overfishing, and alien species. Consequently, a higher proportion of freshwater species are threatened to extinction than their terrestrial or marine counterparts.
Fish Live in Trees Too! River Rehabilitation and Large Woody Debris by Mott, N. (2010) Staffordshire Wildlife Trust, Stafford, UK .http://www.staffs-wildlife.org.uk/page/river-rehabilitation
“In recent times LWD has captured the worldwide attention of practitioners, researchers, anglers, highways engineers, flood risk managers and conservationists. It is becoming increasingly recognised as an
important management tool for accelerating the rehabilitation of degraded watercourses
and their floodplains, providing natural flood defence, and a host of other benefits.”
The historic influence of dams on diadromous fish habitat with a focus on river herring and hydrologic longitudinal connectivity by Carolyn J. Hall, Adrian Jordaan and Michael G. Frisk Landscape Ecology Volume 26, Number 1, 95-107
Abstract The erection of dams alters habitat and longitudinal stream connectivity for migratory diadromous and potamodromous fish species and interrupts much of organismal exchange between freshwater and marine ecosystems. In the US, this disruption began with colonial settlement in the seventeenth century but little quantitative assessment of historical impact on accessible habitat and population size has been conducted.
The River Discontinuum: Applying Beaver Modifications to Baseline Conditions for Restoration of Forested Headwaters by Denise Burchsted, Melinda Daniels, Robert Thorson, Jason Vokoun. BioScience December 2010, Vol. 60, No. 11, Pages 908–922 , DOI 10.1525/bio.2010.60.11.7
Abstract: Billions of dollars are being spent in the United States to restore rivers to a desired, yet often unknown, reference condition. In lieu of a known reference, practitioners typically assume the paradigm of a connected watercourse. Geological and ecological processes, however, create patchy and discontinuous fluvial systems. One of these processes, dam building by North American beavers (Castor canadensis), generated discontinuities throughout precolonial river systems of northern North America.
Tapping Environmental History to Recreate America’s Colonial Hydrology by C.L. Pastore et al. Environ. Sci. Technol. 2010, 44, 8798–8803
"Throughout American history water resources have played integral roles in shaping patterns of human settlement and networks of biological and economic exchange. In turn, humans have altered hydrologic systems to meet their needs. A paucity of climate and water discharge data for the seventeenth and eighteenth centuries, however, has left America’s preindustrial hydrology largely unstudied. As a result, there have been few detailed, quantifiable, regional assessments of hydrologic change between the
time of first European settlement and the dawn of industrial expansion."
Macro-Tidal Salt Marsh Ecosystem Response toCulvert Expansion by Tony Bowron,Nancy Neatt, Danika van Proosdij, Jeremy Lundholm, and Jennie Graham. Restoration Ecology © 2009 Society for Ecological Restoration International doi: 10.1111/j.1526-100X.2009.00602.x
Abstract: The purpose of this paper was to examine the vegetative, sedimentary, nekton and hydrologic conditions pre-restoration and the initial 2 years post-restoration at a partially restricted macro-tidal salt marsh site. Replacement of the culvert increased tidal flow by 88%. This was instrumental in altering the geomorphology of the site, facilitating the creation of new salt marsh pannes, expansion of existing pannes in the mid and high marsh zones, and expansion of the tidal creek network by incorporating relict agricultural ditches.
Ecological re-engineering of a freshwater impoundment for salt marsh restoration in ahypertidal system by D. van Proosdij, J. Lundholm, N. Neatt, T. Bowron, J. Graham. Ecological Engineering 36 (2010) 1314–1332
Abstract:The purpose of this paper was to examine the vegetative, sedimentary, nekton and hydrologic response to ecological re-engineering of a freshwater impoundment in the Upper Bay of Fundy. The dyke was breached in five locations and one channel initiated to connect the river to the borrow pit behind the dyke. This triggered significant self-organization within the restoration site. Existing channels (e.g. borrow pit) were incorporated within the newly excavated and developing creek system, increasing the hydraulic connectivity within the marsh and increasing fish habitat.
Is the recovery of cod (Gadus morhua) along the Maine coast limited by reduced anadromous river herring populations? by
Adrian Jordaan, Carolyn Hall and Michael Frisk. Mia J. Tegner Memorial Research Grant in Marine Historical Ecology and Environmental History Final Report, October 2008
Assessment of the results of the studies presented above poses the next question: could the
decline of spawning river herring populations be a factor in the decline of the productivity of the
inshore cod stock? To answer this question we will consider the patterns in alewife abundance
over 4 time periods; pre-colonial (before 1600), early colonial period (1600-1750), late colonial
period (1750-1900) and industrial period (1900-present).
Seasonal Distribution and Movements of Shortnose Sturgeon and Atlantic Sturgeon in the Penobscot River Estuary, Maine by
Stephen J. Fernandes, Gayle Barbin Zydlewski, Joseph D. Zydlewski, Gail S. Wippelhauser, Michael T. Kinnison Transactions of the American Fisheries Society 2010; 139: 1436-1449
Abstract: Relatively little is known about the distribution and seasonal movement patterns of shortnose sturgeon Acipenser brevirostrum and Atlantic sturgeon Acipenser oxyrinchus oxyrinchus occupying rivers in the northern part of their range. During 2006 and 2007, 40 shortnose sturgeon (66–113.4 cm fork length [FL]) and 8 Atlantic sturgeon (76.2–166.2 cm FL) were captured in the Penobscot River, Maine, implanted with acoustic transmitters, and monitored using an array of acoustic receivers in the Penobscot River estuary and Penobscot Bay.
Alteration of streamflow magnitudes and potential ecological consequences: a multiregional assessment by
Daren M Carlisle, David M Wolock, and Michael R Meador. Front Ecol Environ 2010; doi:10.1890/100053
Abstract: Human impacts on watershed hydrology are widespread in the US, but the prevalence and severity of streamflow alteration and its potential ecological consequences have not been quantified on a national scale. We assessed streamflow alteration at 2888 streamflow monitoring sites throughout the conterminous US. The magnitudes of mean annual (1980–2007) minimum and maximum streamflows were found to have been altered in 86% of assessed streams. The occurrence, type, and severity of streamflow alteration differed markedly between arid and wet climates.
The Effects of the Stronach Dam Removal on Fish in the Pine River,Manistee County, Michiganby Bryan A. Burroughs, Daniel B. Hayes, Kristi D. Klomp, Jonathan F. Hansen, and Jessica Mistak. Transactions of the American Fisheries Society 2010; 139: 1595-1613
Abstract: Although dam removal has been increasingly used as an option in dam management and as a river restoration tool, there are few studies providing detailed quantitative assessment of the response of fish populations to dam removal. In this study, we document the response of the fish community in the Pine River, Michigan, to the gradual removal of Stronach Dam.
NEW! How can we improve information delivery to support
conservation and restoration decisions? by Nathaniel E. Seavy and Christine A. Howell. Biodivers Conserv (2010) 19:1261–1267.
Abstract: Incorporating science into resource conservation and management is becoming increasingly important, but it is not yet clear how to provide information to decision makers most effectively. To evaluate sources of information used to support the management and conservation of California’s riparian bird habitat, we distributed a questionnaire to restoration practitioners and public and private land managers. We asked respondents to rate the importance and availability of different sources of information they
use to inform their decisions. Synthetic reviews and peer-reviewed publications both received high importance and availability ratings.
The Potential Influence of Changing Climate on the Persistence of Salmonids of the Inland West by A.L. Haak, J.E. Williams, D. Isaak, A. Todd, C.C. Muhlfeld, J.L. Kershner, R.E. Gresswell, S.W. Hostetler, and H.M. Neville. U.S. Geological Survey Open-File Report 2010–1236, 74 p.
Abstract Our study examined the influence of changing climate on the persistence of native trout and grayling within 11 western States. The study area ranged from the crests of theCascades and Sierra Nevada eastward through the Rocky Mountains, Great Basin, and Southwest Deserts within the western United States.
Procedures for evaluating and prioritizing the removal of fish passage barriers: a synthesis by Kemp, PS & O'Hanley, JR (2010) . Fisheries Mgmt & Ecology 17: 297-322
Abstract Techniques for assessing the impact of structural barriers on fish passage and for prioritising restoration actions are reviewed. Current survey methodologies are biased towards specific structures, primarily culverts and economically significant fish.
A Functional Relationship Between Watershed Size and Atlantic Salmon Parr Density by J. A. Sweka and G. Mackey Journal of Fish and Wildlife Management, June 2010 Volume 1 Issue 1
Atlantic salmon Salmon salar are at critically low levels in Maine rivers and maintaining current populations depends heavily on the stocking of hatchery-produced fry. Fry survival varies greatly not only among rivers but also within rivers. Better understanding of this spatial variability is needed to improve population recovery efforts. Read More
The origins and persistence of anadromy in brook charr by R. Allen Curry, Louis Bernatchez, Fred Whoriskey Jr. and Céline Audet Reviews in Fish Biology and Fisheries,Springer Science+Business Media B.V. 2010 10.1007/s11160-010-9160-z
We synthesized the results of a coordinated study examining the spatial and temporal movements, genetic structure, and physiological characteristics of sympatric populations of resident and sea-run brook charr across eastern Canada. Our goal was to critically evaluate three working hypotheses that may explain anadromous behaviour in brook charr: (1) resident and anadromous forms have different phylogenic origins; (2) anadromy emerges from freshwater residents; and (3) freshwater residency emerges from anadromous individuals. Read More
Atlantic salmon, archaeology and climate change in New England by Brian S. Robinson, George L. Jacobson, Martin G. Yates, Arthur E. Spiess and Ellen R. Cowie. Journal of Archaeological Science Volume 36, Issue 10, October 2009, Pages 2184-2191
Abstract: A paucity of archaeological remains of Atlantic salmon in Northeast North America has been cited as evidence that the species may have been present in the region only during and after the Little Ice Age (ca. 1450–1850 AD), one of coldest periods of the Holocene. However, significant problems of preservation, recovery and identification remain. View Article
Population genetics of south European Atlantic salmon under global change by A.G. Valiente, E. Beall, E. Garcis-Vazquez. In Global Change Biology Volume 16 Issue 1 Pages 36 - 47 © 2010 Blackwell Publishing
Abstract: Populations at the edge of species distributions are especially vulnerable to climate change. Genetic changes as well as modification of their population structure are expected as reactions to global warming. Atlantic salmon ( Salmo salar ) inhabiting south France has been chosen as a model for studying the effect of global warming in marginal populations during the last 15 years. View Book
The Natural World Vanishes: How Species Cease To Matter By John Waldman in Yale Environment 360 April 2010
"Once, on both sides of the Atlantic, fish such as salmon, eels, and, shad were abundant and played an important role in society, feeding millions and providing a livelihood for tens of thousands. But as these fish have steadily dwindled, humans have lost sight of their significance, with each generation accepting a diminished environment as the new norm." Read More
The role of spatial dynamics in the stability, resilience, and productivity of an estuarine fish population by LA Kerr, SX Cardin, and DH Secor, Ecological Applications, 20(2), 2010, pp. 497–507
Abstract: Understanding mechanisms that support long-term persistence of populations and sustainability of productive fisheries is a priority in fisheries management. Complex spatial structure within populations is increasingly viewed as a result of a plastic behavioral response that can have consequences for the dynamics of a population. Read more
Geomorphic Comparison of Two Atlantic Coastal Rivers: Toward an Understanding of Physical Controls on Atlantic Salmon Habitat. B.C. Wilkins and N. P. Snyder. 2010. River Research and Applications 2010.
Abstract: River channel substrate size and mobility are important to Atlantic salmon spawning and rearing success. We compare morphology and bed sediment between two North American Atlantic coastal streams (Narraguagus River, Maine, USA and Jacquet River, New Brunswick, Canada). The watersheds have similar drainage areas and mean annual precipitation, but differing relief structure, channel longitudinal profiles and numbers of returning salmon. Read more.
Dramatic declines in North Atlantic diadromous fishes. Limburg, K.E., and J. R. 2009.Waldman. BioScience 59: 955-965.
Abstract: We examined the status of diadromous (migratory between saltwater and freshwater) fishes within the North Atlantic basin, a region of pronounced declines in fisheries for many obligate marine species. Data on these 24 diadromous (22 anadromous, 2 catadromous) species are sparse, except for a few high-value forms. For 35 time series, relative abundances had dropped to less than 98% of historic levels in 13, and to less than 90% in an additional 11. Read More