Grasses of the Canadian Arctic Archipelago: a DELTA database for interactive identification and illustrated information retrieval

1996 ◽  
Vol 74 (11) ◽  
pp. 1812-1825 ◽  
Author(s):  
S. G. Aiken ◽  
L. L. Consaul ◽  
M. J. Dallwitz
Keyword(s):  
Information Retrieval ◽  
Canadian Arctic ◽  
Morphological Characters ◽  
Environmental Indicators ◽  
Herbarium Specimens ◽  
Canadian Arctic Archipelago ◽  
Type Specimens ◽  
Line Drawings ◽  
Additional Information ◽  
Annotated Checklist

A comprehensive re-assessment of grasses in the Canadian Arctic Archipelago is presented as an annotated checklist recognizing 49 taxa. Twenty-five names that have been associated with the flora of the islands are excluded. Information was recorded in a DELTA database. For taxa recognized, the following information is included: common name if applicable, place of valid publication, basionyms, limited synonymy, location of type specimens when known and whether we have seen them, 39 vegetative and 60 floral morphological characters, known chromosome number(s), distribution and habitat data, comments in an annotated checklist, and for many taxa, expanded notes conveying additional information. For 37 of the taxa, their usefulness as environmental indicators is recorded. The above information is also available for some of the excluded taxa; for all of them there are notes explaining why the taxon is excluded. The database is illustrated with 46 maps, 17 line drawings of characters useful for identifications, and photographs of 29 type specimens, 19 herbarium specimens, and 58 photographs of plants in their habitats or close up. The data are available as an INTKEY interactive identification and information-retrieval package for MS-Windows, and as natural-language descriptions in four formats: WWW pages, plain text, PostScript, and HP Laserjet files. Keywords: Poaceae, arctic, taxonomy, WWW, Internet, key.

Saxifragaceae of the Canadian Arctic Archipelago: a contribution to a DELTA database for interactive identification and illustrated information retrieval

1998 ◽  
Vol 76 (12) ◽  
pp. 2020-2036 ◽  
Author(s):  
Susan G Aiken ◽  
Michael J Dallwitz ◽  
Cheryl L McJannet ◽  
Lynn J Gillespie ◽  
Laurie L Consaul
Keyword(s):  
Information Retrieval ◽  
Habitat Preferences ◽  
Canadian Arctic ◽  
Morphological Characters ◽  
Canadian Arctic Archipelago ◽  
Environmental Indicator ◽  
Line Drawings ◽  
Additional Information ◽  
The Family ◽  
Annotated Checklist

A re-assessment of members of the family Saxifragaceae in the Canadian Arctic Archipelago is presented as a traditional key and annotated checklist that recognizes 17 taxa. The information on which this paper is based is recorded in a developing DELTA database that aims to collect the following data: place of valid publication; synonymy, usually limited to names that have been associated with the Canadian Arctic; common name(s), if applicable; vegetative and floral morphological characters; data on the distribution, including information about the northernmost record of the taxon; habitat preferences of each species; notes on the species as an environmental indicator; indigenous knowledge; and expanded notes conveying additional information. The database also contains maps, illustrations of characters useful for identification, and colour photographs and line drawings of the taxa. Appendices list characters recorded in the database, brief taxonomic notes, and a sample species description. The data are available on the Internet at http://biodiversity.uno.edu/delta/ as natural-language descriptions and as an INTKEY interactive identification and information-retrieval package for Windows.Key words: Arctic, Canada, DELTA, Internet, Saxifragaceae, taxonomy.

Saxifragaceae of the Canadian Arctic Archipelago: a contribution to a DELTA database for interactive identification and illustrated information retrieval

1998 ◽  
Vol 76 (12) ◽  
pp. 2020-2036 ◽  
Author(s):  
Susan G. Aiken ◽  
Michael J. Dallwitz ◽  
Cheryl L. McJannet ◽  
Lynn J. Gillespie ◽  
Laurie L. Consaul
Keyword(s):  
Information Retrieval ◽  
Canadian Arctic ◽  
Canadian Arctic Archipelago

scholarly journals Spring melt pond fraction in the Canadian Arctic Archipelago predicted from RADARSAT-2

2020 ◽  
Vol 14 (12) ◽  
pp. 4675-4686
Author(s):  
Stephen E. L. Howell ◽  
Randall K. Scharien ◽  
Jack Landy ◽  
Mike Brady
Keyword(s):  
Sea Ice ◽  
Canadian Arctic ◽  
Arctic Sea Ice ◽  
Canadian Arctic Archipelago ◽  
Predictive Information ◽  
Narrow Channels ◽  
Model Simulations ◽  
Additional Information ◽  
Melt Pond ◽  
Stage Of Development

Abstract. Melt ponds form on the surface of Arctic sea ice during spring, influencing how much solar radiation is absorbed into the sea ice–ocean system, which in turn impacts the ablation of sea ice during the melt season. Accordingly, melt pond fraction (fp) has been shown to be a useful predictor of sea ice area during the summer months. Sea ice dynamic and thermodynamic processes operating within the narrow channels and inlets of the Canadian Arctic Archipelago (CAA) during the summer months are difficult for model simulations to accurately resolve. Additional information on fp variability in advance of the melt season within the CAA could help constrain model simulations and/or provide useful information in advance of the shipping season. Here, we use RADARSAT-2 imagery to predict and analyze peak melt pond fraction (fpk) and evaluate its utility to provide predictive information with respect to sea ice area during the melt season within the CAA from 2009–2018. The temporal variability of RADARSAT-2 fpk over the 10-year record was found to be strongly linked to the variability of mean April multi-year ice area with a statistically significant detrended correlation (R) of R=-0.89. The spatial distribution of RADARSAT-2 fpk was found to be in excellent agreement with the sea ice stage of development prior to the melt season. RADARSAT-2 fpk values were in good agreement with fpk observed from in situ observations but were found to be ∼ 0.05 larger compared to MODIS fpk observations. Dynamically stable sea ice regions within the CAA exhibited higher detrended correlations between RADARSAT-2 fpk and summer sea ice area. Our results show that RADARSAT-2 fpk can be used to provide predictive information about summer sea ice area for a key shipping region of the Northwest Passage.

scholarly journals Vascular plant biodiversity of Dorset and Mallik islands, Nunavut, Canada: an annotated checklist of a middle Arctic flora in the Canadian Arctic Archipelago

Phytotaxa ◽  
2020 ◽  
Vol 471 (3) ◽  
pp. 147-192
Author(s):  
JEFFERY M. SAARELA ◽  
PAUL C. SOKOLOFF ◽  
ROGER D. BULL
Keyword(s):  
Plant Diversity ◽  
Environmental Changes ◽  
Vascular Plant ◽  
Canadian Arctic ◽  
The Arctic ◽  
Canadian Arctic Archipelago ◽  
Vascular Plant Diversity ◽  
Diapensia Lapponica ◽  
Circumpolar Arctic ◽  
Annotated Checklist

Establishing a baseline of current Arctic vascular plant diversity and distribution is critical, given the rapid and major environmental changes occurring in the Arctic ecozone in response to climate change. Here, we report the results of a floristic study of vascular plant diversity of Dorset and Mallik islands in the Canadian Arctic Archipelago, Nunavut, Canada. These two small islands lie off the coast of the Foxe Peninsula of southwestern Baffin Island, and they are part of the Circumpolar Arctic bioclimate Subzone C. The hamlet of Kinngait (formerly Cape Dorset) is located on Dorset Island, and Nunavut’s Mallikjuak Territorial Park encompasses all of Mallik Island. The study is based on a specimen-based dataset comprising 876 unique collections from the two islands gathered over the last century, including 268 new ones collected in 2015. Results are presented in an annotated checklist. The vascular plant flora of the study area comprises 26 families, 71 genera, 150 species and three infraspecific taxa; 139 species are recorded on Dorset Island and 102 on Mallik Island. Eleven taxa are newly recorded from the study area in six families: Carex rupestris, Eriophorum scheuchzeri subsp. scheuchzeri, E. triste (Cyperaceae); Diapensia lapponica (Diapensiaceae); Equisetum arvense subsp. alpestre (Equisetaceae); Oxytropis deflexa var. foliolosa (Fabaceae); Potentilla arenosa subsp. arenosa, P. hyparctica subsp. hyparctica (Rosaceae); Antennaria friesiana subsp. friesiana, Askellia pygmaea, and Taraxacum phymatocarpum (Asteraceae).

Taxonomy of the genus Chlamisus Rafinesque (Coleoptera: Chrysomelidae) from China with description of three new species

Zootaxa ◽  
2017 ◽  
Vol 4233 (1) ◽  
pp. 1
Author(s):  
LIANG SU ◽  
HONG-ZHANG ZHOU
Keyword(s):  
New Species ◽  
Morphological Characters ◽  
Leaf Beetle ◽  
Type Specimens ◽  
Line Drawings ◽  
Chinese Academy Of Sciences ◽  
Species Type ◽  
Three New Species ◽  
Academy Of Sciences ◽  
First Time

This study is focused on the Chinese fauna of the leaf beetle genus Chlamisus Rafinesque, 1815 (Coleoptera: Chrysomelidae) and three new species are described, namely C. corollinotatus sp. nov. from Guangxi, and C. lycocephalus sp. nov. and C. varipennatus sp. nov. from Yunnan. The number of the Chinese Chlamisus is thus increased to 66. Twenty-five species are redescribed with the emphasis mainly on the genital morphological characters that are observed and reported for the first time for most species of the genus from China. Color plates and line drawings of general habitus and other detailed structures are also provided. Chinese fauna of the genus is keyed to species. Type specimens of the new species and other materials included in this study are deposited in the Institute of Zoology, the Chinese Academy of Sciences, Beijing. 

scholarly journals Spring melt pond fraction in the Canadian Arctic Archipelago predicted from RADARSAT-2

2020 ◽  
Author(s):  
Stephen Edward Lee Howell ◽  
Randall Kenneth Scharien ◽  
Jack Landy ◽  
Mike Brady
Keyword(s):  
Sea Ice ◽  
Canadian Arctic ◽  
Arctic Sea Ice ◽  
Canadian Arctic Archipelago ◽  
Predictive Information ◽  
Narrow Channels ◽  
Model Simulations ◽  
Additional Information ◽  
Melt Pond ◽  
Stage Of Development

Abstract. Melt ponds form on the surface of Arctic sea ice during spring, influencing how much solar radiation is absorbed into the sea ice-ocean system, which in turn impacts the ablation of sea ice during the melt season. Accordingly, melt pond fraction (fp) has been shown to be a useful predictor of sea ice area during the summer months. Sea ice dynamic and thermodynamic processes operating within the narrow channels and inlets of the Canadian Arctic Archipelago (CAA) during the summer months are difficult for model simulations to accurately resolve. Additional information on fp variability in advance of the melt season within the CAA could help constrain model simulations and/or provide useful information in advance of the shipping season. Here, we use RADARSAT-2 imagery to predict and analyze peak spring fp and evaluate its utility to provide predictive information with respect to sea ice area during the melt season within the CAA from 2009–2018. The temporal variability of RADARSAT-2 fp over the 10-year record was found to be strongly linked to the variability of mean April multi-year ice area and the spatial distribution of RADARSAT-2 fp was found to be in excellent agreement with the sea ice stage of development prior to the melt season. RADARSAT-2 fp values were in good agreement with the peak fp observed from in situ observations but were found to be ∼0.05 larger compared to peak MODIS fp observations. Statistically significant detrended correlations between RADARSAT-2 fp and summer sea ice area were found for several regions within the CAA. Our results show that RADARSAT-2 fp can be used to provide predictive information about summer sea ice area for a key shipping region of the Northwest Passage.

scholarly journals A non-destructive virtual dissection by micro-CT reveals diagnostic characters in the type specimen of Caloptilia stigmatella (Lepidoptera: Gracillariidae)

Zootaxa ◽  
2018 ◽  
Vol 4441 (1) ◽  
pp. 137
Author(s):  
JEANNE ROBINSON ◽  
JEREMY GIBSON ◽  
HELBER ADRIÁN ARÉVALO-MALDONADO ◽  
JURATE DE PRINS ◽  
JAMES WINDMILL
Keyword(s):  
Type Specimen ◽  
Morphological Characters ◽  
Wide Distribution ◽  
Wing Venation ◽  
Type Specimens ◽  
Unique Type ◽  
Species Groups ◽  
Primary Type ◽  
Taxonomic Studies ◽  
Non Destructive

Nearly a century ago, wing venation was introduced in gracillariid taxonomy as a means to diagnose closely related genera and species groups. Recent advances in non-destructive virtual micro-dissections suggest promising approaches with which to revisit the relevance of wing venation characters on historic primary type specimens. Many unique type specimens in Gracillariidae and other microlepidoptera groups preserved in museum collections are in poor condition, and over the course of history have suffered loss or damage to their abdomens. Consequently, genitalia morphology is not available for diagnoses and comparisons. In this paper we emphasize the need to include the type species and type specimens into the broader context of taxonomic studies on micro-moths in general and the family Gracillariidae in particular. The genus Caloptilia has a world-wide distribution and has been the subject of research for more than 200 years, yet the generic boundaries and groupings within the genus are still unresolved due to the lack of a reliable set of taxonomic characters obtained from the primary types. We describe a method of virtual descaling of the fore- and hindwings using the unset micro-moth type specimen of Caloptilia stigmatella Fabricius, 1781, in order to demonstrate that the study of historic and fragile type specimens and diagnoses of their internal morphological characters becomes possible by applying new and non-destructive technology. 

A revision of Holothuria (Halodeima) kefersteinii (Selenka, 1867) and the revival of Holothuria inornata Semper, 1868 from sea cucumbers collected in Mexico and Central America

Zootaxa ◽  
2018 ◽  
Vol 4377 (2) ◽  
pp. 151 ◽  
Author(s):  
MAGALI HONEY-ESCANDÓN ◽  
FRANCISCO A. SOLÍS-MARÍN
Keyword(s):  
Central America ◽  
Ecological Study ◽  
Original Description ◽  
Morphological Characters ◽  
Color Pattern ◽  
Type Specimens ◽  
Sea Cucumbers ◽  
Mexican Pacific ◽  
Different Color

In 1958 Deichmann synonymized Holothuria inornata Semper, 1868 with Holothuria kefersteinii (Selenka, 1867). This nomenclature has been adopted until now. However, some specimens recently collected from the Mexican Pacific matched the original description of H. inornata Semper (1868) whereas others matched the original description by Selenka (1867). A morphological, molecular and ecological study of the specimens was conducted to confirm the identification of these specimens. The morphological characters of our specimens were compared with those contained in the original descriptions and figures of the types of both species. Besides the different color pattern of live specimens of both species, the main differences found are the presence of straight distally perforated rods in the dorsal papillae, and the presence of Holothuriophilus trapeziformis Nauck, 1880 in the cloaca of H. inornata, versus the absence of these kind of rods in the dorsal papillae, and the absence of symbionts in the cloaca in H. kefersteinii. The species identified by Deichmann (1958) as H. kefersteinii is, in fact H. inornata. Both species might have been confused because the morphology of preserved specimens is very similar and the presence of the straight rods in papillae might have been overlooked during identification. A more thorough review of the ossicles from the specimens, together with the comparison of ossicles from the type specimens, has allowed the resurrection of long-forgotten species, H. inornata 

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