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Paul Szpak
Trent University
GeologyEcologyStable isotope ratioIsotope analysisBiology
40Publications
16H-index
915Citations
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Publications 47
Newest
#1Eric J. Guiry (Trent University)H-Index: 10
#2Thomas C.A. Royle (SFU: Simon Fraser University)H-Index: 1
Last. Bruce P. Finney (ISU: Idaho State University)H-Index: 44
view all 14 authors...
The ability to distinguish between different migratory behaviours (e.g., anadromy and potamodromy) in fish can provide important insights into the ecology, evolution, and conservation of many aquatic species. We present a simple stable carbon isotope (delta13C) approach for distinguishing between sockeye (anadromous ocean migrants) and kokanee (potamodromous freshwater residents), two migratory ecotypes of Oncorhynchus nerka (Salmonidae) that is applicable throughout most of their range across c...
1 CitationsSource
#1Paul Szpak (Trent University)H-Index: 16
#2Marie‐Hélène Julien (SFU: Simon Fraser University)H-Index: 1
Last. Michael P. Richards (SFU: Simon Fraser University)H-Index: 8
view all 6 authors...
1 CitationsSource
#1Paul Szpak (Trent University)H-Index: 16
#2Daniela Valenzuela (University of Tarapacá)H-Index: 5
Management of camelids in the coastal valleys of the Andes has generated much debate in recent years. Zooarchaeological and isotopic studies have demonstrated that in the coastal valleys of northern and southern Peru there were locally maintained camelid herds. Because of the hyperarid conditions of the northern coast of Chile, this region has been assumed to be unsuitable for the raising of camelids. In this study we report stable carbon and nitrogen isotopic compositions of camelid bone collag...
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#1Eric J. Guiry (Trent University)H-Index: 10
#2Michael Buckley (University of Manchester)H-Index: 25
Last. Paul Szpak (Trent University)H-Index: 16
view all 7 authors...
3 CitationsSource
#1Paul Szpak (Trent University)H-Index: 16
#2Katherine L. Chiou (UA: University of Alabama)H-Index: 2
Isotopic measurements of plant remains from archaeological sites are now routinely used to reconstruct agricultural practices in the Old World. These studies use charred botanical remains as the analytical substrate because (1) these are the materials that are commonly preserved in the archaeological record and (2) the integrity of the isotopic compositions of archaeological plant remains that are uncharred or desiccated has been questioned, particularly for δ15N. By comparing charred and unchar...
Source
#1Mikkel Skovrind (Wild Center)H-Index: 2
#2Jose Alfredo Samaniego Castruita (Wild Center)H-Index: 5
Last. Eline D. Lorenzen (Wild Center)H-Index: 19
view all 9 authors...
In 1990, a skull from a morphologically unusual Monodontid was found in West Greenland and collected for the Natural History Museum of Denmark, University of Copenhagen. From its intermediate morphology, the skull was hypothesized to be a beluga/narwhal hybrid. If confirmed, the specimen would, to our knowledge, represent the sole evidence of hybridization between the only two toothed whale species endemic to the Arctic. Here we present genome-wide DNA sequence data from the specimen and investi...
3 CitationsSource
#1Frédéric Delsuc (University of Montpellier)H-Index: 42
#2Melanie Kuch (McMaster University)H-Index: 19
Last. Hendrik N. Poinar (McMaster University)H-Index: 44
view all 13 authors...
Summary Living sloths represent two distinct lineages of small-sized mammals that independently evolved arboreality from terrestrial ancestors. The six extant species are the survivors of an evolutionary radiation marked by the extinction of large terrestrial forms at the end of the Quaternary. Until now, sloth evolutionary history has mainly been reconstructed from phylogenetic analyses of morphological characters. Here, we used ancient DNA methods to successfully sequence 10 extinct sloth mito...
3 CitationsSource
#1Paul Szpak (Trent University)H-Index: 16
#2Fred J. Longstaffe (UWO: University of Western Ontario)H-Index: 44
Last. Michael P. Richards (SFU: Simon Fraser University)H-Index: 8
view all 6 authors...
This study presents sulfur isotope compositions (δ34S) for plants grown in a series of growth chamber and field experiments under controlled conditions. Maize, beans, and squash fertilized with a marine fertilizer (seabird guano) were significantly enriched in 34S relative to the unfertilized control plants (by +4.0 to +7.2‰) in the growth chamber experiments. No 34S enrichment was detected in the plants from the field experiment, which likely relates to the recent use of ammonium sulfate fertil...
Source
#1Paul Szpak (Trent University)H-Index: 16
#2James M. Savelle (McGill University)H-Index: 18
Last. Michael P. Richards (SFU: Simon Fraser University)H-Index: 8
view all 4 authors...
Abstract Environmental change in the Arctic has been a primary topic of interest in recent years, particularly as it relates to the consequences of anthropogenic climate change. Sea ice is of particular importance in this context, both in terms of the effects of climate change in the Arctic, but also globally. Most studies examining the responses of various components of the biosphere to warming temperatures necessarily have a short temporal perspective. The purpose of this study was to use stab...
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#1Paul SzpakH-Index: 16
Last. James M. SavelleH-Index: 18
view all 3 authors...
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