Distribution patterns of disjunct and endemic vascular plants in the interior wetbelt of northwest North America

Björk, Curtis R.
April 2010
Botany;Apr2010, Vol. 88 Issue 4, p409
Academic Journal
A region of contrastively wetter and milder climate occurs in inland northwest North America, separated from similar climates of the Pacific coast by 200–400 km. Researchers have long noted that numerous vascular plants divide their ranges between the interior wetbelt and coastal regions, although many such disjunctions have hitherto gone undocumented. Here I summarize all vascular plants shared between coastal and interior wetbelt regions, disjunct by at least 200 km. These disjunct taxa are assigned to north-coast and south-coast lists according to whether the coastal portions of the ranges occur primarily north or south of the southern limits of maximum continental glaciation. A list of interior wetbelt endemic taxa is also presented, focusing on those that occur at forested elevations. Presence/absence for coastal disjunct and endemic taxa were assigned to grid of 1° × 1°latitude–longitude cells. Using this grid, concentrations of disjunct and endemic taxa were detected, and total values per cell were tested in linear regression for a relationship to mean annual precipitation. In total, 116 coastal disjunct taxa were detected, 31 of them north-coastal and 85 south-coastal. Interior wetbelt endemic and subendemic taxa total 95, and of these, 46 were found primarily at forested elevations. North-coast taxa were found over a wide latitudinal range both north and south of the glacial limits, and their distribution had a weak positive relationship with annual precipitation. South-coast and endemic taxa were found mostly south of the glacial limits, and their distribution did not correlate to annual precipitation. The greatest concentrations of south coastal disjunct and endemic taxa occurred in the Clearwater region of north-central Idaho; a region noted by previous researchers to be a likely ice-age refugium for wet-climate dependent plants and animals. Inferences are made from these patterns, both for biogeographical understanding of the roles played by the interior wetbelt and some regions connecting to the coast, as well as for preservation of biodiversity and ecosystem continuity. On retrouve une région contrastée humide à climat plus doux à l’intérieur des terres dans le nord-ouest de l’Amérique du Nord, laquelle est éloignée de climats similaires sur la côte du Pacifique de 200 à 400 km. Les chercheurs ont noté depuis longtemps que de nombreuses plantes vasculaires divisent leurs aires entre la ceinture humide dans les terres et les régions côtières, bien que de telles disjonctions soient restées non documentées jusqu’ici. L’auteur résume l’ensemble des plantes vasculaires partagées entre les régions côtières et la ceinture humide dans les terres, séparées par au moins 200 km. Il attribue ces taxons disjoints aux listes côte nord et côte sud, selon que les portions côtières des aires se retrouvent prioritairement au nord ou au sud des limites sud de la glaciation continentale maximale. Il présente également une liste d’espèces endémiques de la ceinture humide de l’intérieur, avec accent sur celles qui se retrouvent dans les forêts de haute élévation. Il a attribué à des grilles cellulaires de 1°× 1°degré de latitude–longitude, la présence/absence des taxons disjoints et endémiques. à l’aide de cette grille, l’on a pu détecter les concentrations de taxons disjoints et endémiques, et tester les valeurs totales par régression linéaire afin d’établir une relation avec la précipitation annuelle moyenne. Au total, on a décelé 116 taxons disjoints, 31 d’entre eux nord côtiers et 85 sud côtiers. Les endémiques de la ceinture à l’intérieur des terres regroupent 95 taxons, 46 d’entre eux retrouvés prioritairement dans les forêts en altitude. On retrouve les taxons endémiques nord côtiers sur une grande aire latitudinale, surtout à la limite glaciaire sud, et leur distribution ne montre pas de corrélation avec la précipitation annuelle. Les plus grandes concentrations de taxons endémiques disjoints sud côtiers se retrouvent dans la région de Clearwater au centre nord de l’Idaho, une région désignée par des chercheurs antécédents comme refuge probable de l’âge glaciaire pour les plantes et les animaux dépendants d’un climat humide. À partir de ces patrons, l’auteur déduit des conséquences &#x


Related Articles

  • Global distribution of Fusarium graminearum, F. asiaticum and F. boothii from wheat in relation to climate. Backhouse, David // European Journal of Plant Pathology;May2014, Vol. 139 Issue 1, p161 

    Species of Fusarium that have been segregated from F. graminearum have restricted geographic ranges and it has been suggested that this is due to climate, especially for F. asiaticum. Climate envelope modelling with BIOCLIM was used to quantify the differences in climatic range for F....

  • Spatial heterogeneity of the species composition of a clavarioid fungi's compex in the Eurasian Arctic. Shiryaev, A. // Contemporary Problems of Ecology;Jul2013, Vol. 6 Issue 4, p381 

    Using the example of a model group of macromycete (clavarioid fungi), a large-scale investigation into the mycological complex of the Eurasian Arctic is conducted. The species composition of clavarioid fungi's complex is revealed in all longitudinal sectors and latitudinal subzones, and a...

  • Konya Åžartlarında Yağış, Sıcaklık ve Bitki Örtüsü Ä°liÅŸkisi. KAYA, Baştürk; ALADAĞ, Caner // Selcuk University Social Sciences Institute Journal;2009, Vol. 22, p265 

    Distribution of existing flora and the limits of plant sites at the earth surface have been continuously got changed by the external factors' effects. These external factors that affecting the distribution of flora, are geological, geomorphological, edaphic and climatic origined. These are...

  • Global gradients in moss and vascular plant diversity. Möls, Tõnu; Vellak, Kai; Vellak, Ain; Ingerpuu, Nele // Biodiversity & Conservation;Jun2013, Vol. 22 Issue 6/7, p1537 

    Knowledge on the distribution and hotspots of different taxon groups is indispensable for improving the state of biodiversity protection. Our aim was to determine if the relations between major environmental factors and species richness of two plant groups, mosses and vascular plants differ on a...

  • New Floristic Records of Ranunculaceae Family. �z�elik, Hasan; Korkmazt�rk, Mahmut // Suleyman Demirel University Journal of Science;Nov2012, Vol. 7 Issue 2, p100 

    A study has been made about the revision of Ranunculaceae family between 2009-2011 years. Turkiye's important and major herbariums (especially Hb. GUL) have been visited and related family patterns were revised. In end of the study; it is determined that 55 taxa as new records for 78...

  • Phytogeography of the Andaman--Nicobar Islands with special reference to Hornstedtia fenzlii (Kurz) K. Schum. Mathew, Sam P.; Radha, R. K.; Krishnan, P. N.; Seeni, S. // Current Science (00113891);4/10/2010, Vol. 98 Issue 7, p905 

    The article discusses the phytogeography of the Andaman and Nicobar Islands in India with reference to the discovery of Hornstedtia fenzlii (Kurz) K. Schum plant. It notes that biological organisms of the islands are continental in origin and have evolved into the present status from a totally...

  • Harvesting and growing aerial offsets from Orthophytum. Herndon, Alan // Journal of the Bromeliad Society;Apr-Jun2015, Vol. 65 Issue 2, p122 

    The article reports that Orthophytum subcomplex disjunctum is one of the largest recognizable groups among the species of Orthophytum. When vegetative offsets are produced from these cones of the disjunctum subcomplex, they provide an easy method for propagating the species as long as you follow...

  • New or critical records for the flora of Argentina: Gloxinia gymnostoma and G. nematanthodes (Gesneriaceae). Xifreda, Cecilia Carmen // Darwiniana;1996, Vol. 34 Issue 1/2, p383 

    The presence of Gloxinia gymnostoma Griseb. and Gloxinia nematanthodes (Kuntze) Wiehler for NW Argentina is reviewed. The first, has been previously cited with mixed materials and in consequence, with incorrect delimitation. Geographical distribution, morphological differences and pollen grain...

  • First record of the rust fungus Endophyllum sempervivi (Alb. & Schwein.) de Bary (Pucciniomycetes) in Serbia. Ljaljević Grbić, Milica; Lakušić, Dmitar; Stupar, Miloš; Vukojević, Jelena // Botanica Serbica;2016, Vol. 40 Issue 2, p261 

    Endophyllum sempervivi, known to cause rust on Sempervivum and Jovibarba species, is here documented for the first time in Serbia, on Jovibarba heuffelii growing at two localities (in the gorge of Studenica River and on Mt. Treska). Aside from Serbia, an additional report of infected J....


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics