Carina Gjerdrum

Carina Gjerdrum
Environment and Climate Change Canada · Canadian Wildlife Service

About

48
Publications
10,160
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
922
Citations
Introduction
Skills and Expertise

Publications

Publications (48)
Article
Full-text available
Conservation of mobile organisms is difficult in the absence of detailed information about movement and habitat use. While the miniaturization of tracking devices has eased the collection of such information, it remains logistically and financially difficult to track a wide range of species across a large geographic scale. Predictive distribution m...
Article
Full-text available
Reproduction in procellariiform birds is characterized by a single egg clutch, slow development, a long breeding season and obligate biparental care. Female Leach’s Storm Petrels Hydrobates leucorhous, nearly monomorphic members of this order, produce eggs that are between 20 and 25% of adult body weight. We tested whether female foraging behaviour...
Article
Full-text available
The Arctic is changing rapidly due to climate change, which is allowing unprecedented levels of vessel traffic to transit the region. Vessel traffic can negatively affect marine wildlife in a number of ways, particularly in areas where vessels overlap with high concentrations of ecologically important species, and the significance of these impacts...
Article
Full-text available
Marine spatial planning relies on detailed spatial information of marine areas to en -sure effective conservation of species. To enhance our understanding of marine habitat use by thehighly pelagic Bermuda petrel Pterodroma cahow, we deployed GPS tags on 6 chick-rearingadults in April 2019 and constructed a habitat suitability model using locations...
Article
Full-text available
Biological production in the oceanic zone (i.e. waters beyond the continental shelves) is typically spatially patchy and strongly seasonal. In response, seabirds have adapted to move rapidly within and between ocean basins, making them important pelagic consumers. Studies in the Pacific, Southern and Indian Oceans have shown that seabirds are relat...
Article
Artificial lights can disorient birds and lead to injury or death. In Atlantic Canada, lights attract birds at sites along the coastline and offshore, but the relative impacts of lights on birds in this region are largely unknown. We summarized data on stranded bird encounters submitted annually to the Canadian Wildlife Service, Environment and Cli...
Article
Full-text available
Understanding the movements of seabirds, which are important ecological indicators, can provide new insights into physical and biological aspects of the marine environment. This information can also be used in planning marine conservation and oil spill response strategies. Though Black Guillemots Cepphus grylle are widely distributed in the coastal...
Article
Despite much interest and research into marine litter (including plastic debris) on beaches globally, relatively little is known about the density and distribution of this pollutant in Arctic environments, particularly Arctic Canada and West Greenland. We used two sources of data, observations of floating litter from vessels at sea, and quadrat sur...
Data
Maps of average densities, with shapfiles and files of seabirds at sea from ECCC surveys in easten Canada 2006-2016.
Poster
Full-text available
Leach’s storm-petrel (Oceanodroma leucorhoa = Hydrobates leucorhous) is a small seabird species that was listed as globally vulnerable on the IUCN’s Red List of Threatened Species in 2016. Breeding populations have declined more than 30% over the last three generations in Atlantic Canada. Elevated mercury exposure may be contributing to this specie...
Article
Full-text available
Calonectris diomedea (Cory's Shearwater) are observed in small numbers in Atlantic Canada every year. However, in 2016 and 2017, unusually high numbers were reported in both Nova Scotia and Newfoundland and Labrador, Canada. We used data from eBird and from standardized ship-based surveys to document the timing and magnitude of the increase. Result...
Article
Knowing the spatial scales at which effective management can be implemented is fundamental for conservation planning. This is especially important for mobile species, which can be exposed to threats across large areas, but the space use requirements of different species can vary to an extent that might render some management approaches inefficient....
Article
Millions of seabirds use the waters off Baffin Island. Considering current and future vessel activity in this region, it is important to understand where vulnerability to anthropogenic threats is highest to enable sound wildlife management and regulatory decisions. Using kernel density analysis on at-sea survey data spanning 1970 to 1983 and 2007 t...
Article
During late summer and early autumn, the Bay of Fundy, Canada, is an important foraging area for many species of post-breeding and migratory seabirds, yet there has been limited effort to quantify the number of birds using these waters. Furthermore, the numbers of phalaropes Phalaropus spp. using this region as a stopover during autumn migration is...
Article
Seabirds are vulnerable to incidental harm from human activities in the ocean, and knowledge of their seasonal distribution is required to assess risk and effectively inform marine conservation planning. Significant hydrocarbon discoveries and exploration licenses in the Labrador Sea underscore the need for quantitative information on seabird seaso...
Article
Breeding strategies can shape the timing of other events and processes, including arrival on the breeding grounds, prebasic molt, and departure for fall migration. We studied these relationships in sympatric Saltmarsh Sparrows (Ammodramus caudacutus) and Seaside Sparrows (A. maritimus), 2 closely related species with notably different breeding stra...
Article
Full-text available
Sea-level rise will affect coastal species worldwide, but models that aim to predict these effects are typically based on simple measures of sea level that do not capture its inherent complexity, especially variation over timescales shorter than one year. Coastal species might be most affected, however, by floods that exceed a critical threshold. T...
Article
Little is known about how biotic interactions will influence the distributions of vegetation types under climate change, but these interactions could determine the effectiveness of conservation actions aimed at encouraging ecosystem migration. Tidal marshes are threatened by sea-level rise worldwide unless losses are offset by landward migration. W...
Article
1.There is ongoing debate in ecology about the value of the increasing complexity of analytical methods, especially as it relates to models that correct occupancy or abundance estimates for imperfect detection. While both arguments for and against increasing complexity have merit, there is a need for greater clarity on how to determine what level o...
Article
Full-text available
Large-scale relationships between changes in abundance of coastal breeding Herring (Larus argentatus) and Great Black-backed (L. marinus) gulls and commercial fisheries landings of bottom-dwelling groundfish spanning 28 years in four of Canada's east coast Provinces were investigated. Herring and Great Black-backed gull abundance data were compared...
Article
Full-text available
Comprehensive understanding of the potential threats faced by seabirds requires information on their distribution and abundance in the marine environment where they spend a significant part of their life cycle. Data collected from shipboard seabird surveys from 2006-2014 were examined to identify high density marine areas in eastern Canada for Herr...
Article
Cruise MSM42 with RV MARIA S. MERIAN dealt with investigating the recent changes in the water mass structure and the oceanic circulation system in a narrow region focusing on the vicinity of Flemish Pass and Flemish Cap located at the western edge of the subpolar North Atlantic. Several densely spaced hydrographic sections were carried out across m...
Article
The distribution and thickness of sea ice in the Arctic is changing rapidly, resulting in changes to Arctic marine ecosystems. Seabirds are widely regarded as indicators of marine environmental change, and understanding their distribution patterns can serve as a tool to monitor and elucidate biological changes in the Arctic seas. We examined the at...
Technical Report
Three midwater-trawl surveys of the nekton and micronekton at meso- and bathypelagic depths in The Gully, a submarine canyon and Marine Protected Area immediately east of Sable Island, were conducted in August / September 2008, August 2009 and March 2010 respectively. The surveys were designed to gather data on fish, cephalopods and crustaceans but...
Article
Full-text available
Obtaining useful information on marine birds that can aid in oil spill (and other hydrocarbon release) risk and damage assessments in offshore environments is challenging. Technological innovations in miniaturization have allowed archival data loggers to be deployed successfully on marine birds vulnerable to hydrocarbons on water. A number of speci...
Article
Seabirds and other marine animals are at risk from anthropogenic activities that target them directly and those that can harm them incidentally. We integrate year-round tracking and vessel studies to assess risks for a globally important seabird population in the North-West Atlantic. The eastern Canadian Grand Bank has a rich and diverse food web t...
Technical Report
Full-text available
Over the past several decades, a significant amount of knowledge from scientific studies has been gathered by Fisheries and Oceans Canada (DFO), in addition to other national and international efforts, on the marine ecosystem and marine resources of Georges Bank. This research document is a compilation of DFO's most up-to-date ‘state of knowledge’...
Article
Full-text available
We studied mating patterns in Saltmarsh Sparrows (Ammodramus caudacutus), a species with no territorial defense, no paternal care, and no pair bonds. Fifty-seven of 60 broods with at least 2 sampled chicks (and all broods that were completely sampled) resulted from multiple mating by females. About one-third of the broods had a different father for...
Technical Report
Full-text available
The conservation of migratory birds is the responsibility of the Government of Canada. Environment Canada (EC) is the lead federal department for migratory bird conservation in Canada as mandated by the Migratory Birds Convention Act, 1994. As such, EC is recognized as the agency responsible for, and a source of expert information on, migratory bir...
Article
Full-text available
In long-lived species, juvenile survival and the age at which individuals begin the process of recruitment have important consequences for individual fitness and population growth. We investigated how characteristics of fledglings (mass, wing length, and date) influenced the local survival of juveniles and age at first return to the natal breeding...
Article
Full-text available
Utilicé un experimento de suplementación de alimento para determinar si los adultos de Fratercula cirrhata disminuirían su esfuerzo de aprovisionamiento como respuesta a una reducción en los requerimientos nutricionales de sus pichones y para investigar la relación entre el esfuerzo parental de aprovisionamiento y el momento del emplumamiento. Como...
Article
Full-text available
Frecuentemente se utilizan modelos de hábitat para describir las distribuciones de las especies. Sin embargo, estos modelos deben ser probados para evaluar su poder de predicción. Investigamos la importancia de la evaluación de modelos en un estudio sobre selección de hábitat en Ammodramus caudacutus, una especie del este de Norteamérica en estado...
Article
Full-text available
Determinamos los patrones de asistencia a los nidos de Ammodramus caudacutus en Connecticut usando aparatos automáticos de registro de temperatura. En esta especie, sólo las hembras incuban y alimentan a los pichones. Las hembras mantuvieron un ambiente térmico estable en sus nidos durante la incubación modificando su comportamiento de asistencia c...
Article
Full-text available
We determined nest attendance patterns of Saltmarsh Sharp-tailed Sparrows (Ammodramus caudacutus) in Connecticut using temperature data-loggers. In this species, only females incubate and feed the young. Females maintained a stable thermal environment in their nests during incubation by modifying their attendance behavior in relation to ambient tem...
Article
Saltmarsh Sharp-tailed Sparrows (Ammodramus caudacutus) build ground nests, often with a closely-woven dome, in marshes that frequently flood during high tides. To test the hypothesis that domed nests help reduce the loss of eggs and chicks due to flooding or predation, we examined the characteristics and fate of 102 nests at sites along the coast...
Article
Full-text available
For burrow-nesting seabirds, investigators have examined nestling diet by attaching harnesses to the bills of nestlings; to intercept food delivered by the parent. To determine whether this method provides an unbiased estimate of nestling diet, we evaluated its effect on the provisioning behavior of Tufted Puffins (Fratercula cirrhata) nesting on T...
Article
Full-text available
Tidal-marsh vertebrates experience two distinct challenges to successful reproduction: inundation of the soil with water, which is variable and often unpredictable, and the simple vegetative structure, which offers few safe havens from predation. We review both published and unpublished studies of tidal-marsh birds and their relatives to determine...
Article
Full-text available
We examined nest-site selection and nesting success in Saltmarsh Sharp-tailed (Ammodramus caudacutus) and Seaside Sparrows (A. maritimus), at seven sites in Connecticut. We found 160 Saltmarsh Sharp-tailed Sparrow nests and 23 Seaside Sparrow nests, and compared characteristics of their locations to each other and to random locations. We tracked su...
Article
We examined nest-site selection and nesting success in Saltmarsh Sharp-tailed (Ammodramus caudacutus) and Seaside Sparrows (A. maritimus), at seven sites in Connecticut. We found 160 Saltmarsh Sharp-tailed Sparrow nests and 23 Seaside Sparrow nests, and compared characteristics of their locations to each other and to random locations. We tracked su...
Article
I used a supplemental feeding experiment to determine whether adult Tufted Puffins (Fratercula cirrhata) would decrease provisioning effort in response to a reduction in nestling nutritional requirements, and to investigate the relationship between parental provisioning effort and timing of fledging. As predicted, parents of the supplemented nestli...
Article
Full-text available
Anomalously warm sea-surface temperatures (SSTs) are associated with interannual and decadal variability as well as with long-term climate changes indicative of global warming. Such oscillations could precipitate changes in a variety of oceanic processes to affect marine species worldwide. As global temperatures continue to rise, it will be critica...

Network

Cited By