As a consequence of the find of the P. antipodarum in Capitol Lake, I was contracted by the Washi... more As a consequence of the find of the P. antipodarum in Capitol Lake, I was contracted by the Washington Invasive Species Council (Washington State Recreation & Conservation Office) to conduct the first survey to determine if there were any additional introductions of P. antipodarum outside of Capitol Lake. The survey covered mapped freshwater bodies within a 5-mile radius of Capitol Lake. Though main purpose of the survey was to find evidence of P. antipodarum introductions outside of Capitol Lake, a secondary result was the first detailed survey of the freshwater mollusk fauna of the region around Capitol Lake. Not much was reported in the literature regarding freshwater mollusk occurrences in the Olympia area. Malacologists such as Henry Hemphill and Junius Henderson conducted surveys in western Washington, which briefly included this area. Branley Branson did extensive surveys in western Washington, but he surveyed immediately adjacent areas in the Cascades and Olympic Peninsula. ...
A recent field survey of the Pit River basin in northeastern California resulted in the discovery... more A recent field survey of the Pit River basin in northeastern California resulted in the discovery of numerous undescribed populations of aquatic rissooidean snails which are treated in this paper. Based on morphological study and analysis of mitochondrial DNA sequences we describe a new species of the genus Colligyrus (family Amnicolidae) and four new species of the genus Pyrgulopsis (Hydrobiidae). Phylogenetic analysis of sequence data suggests that the new species of Colligyrus is sister to an undescribed congener from the Klamath basin. The four new species of Pyrgulopsis do not form a monophyletic group but instead are variously related to other regional congeners. We also describe Pit River basin populations of two species of Pyrgulopsis which were previously considered to be endemic to the northwestern Great Basin (P. eremica) and Klamath basin (P. archimedis).
... PETER A. BOWLER ... Page 2. Page 222 The Veliger, Vol. 37, No. 3 Taylor (1982). Recent fieldw... more ... PETER A. BOWLER ... Page 2. Page 222 The Veliger, Vol. 37, No. 3 Taylor (1982). Recent fieldwork in this region has per-mitted large collections of these two snails, and laboratory studies have suggested that these represent new genera, which we describe below. ...
A total of 31 sites were collected in the north and middle basins of Capitol Lake and one in Perc... more A total of 31 sites were collected in the north and middle basins of Capitol Lake and one in Percivial Creek. Twenty-seven of the sites sampled in Capitol Lake had live NZMS present. Of the 3 sites in the middle basin, 2 had only dead NZMS shells present while the southernmost one had none present. Based on a number of the NZMS at the 27 live sites in the lake a density contour map was drawn. The highest densities of the NZMS occur in the north basin of Capitol Lake from the outlet of the lake at the dam to the east along the shoreline. Additional areas of high densities of the NZMS occur in the southern part of the north basin just north of the railroad grade and along the east bank of the north part of the middle basin. The lowest densities of the NZMS are found in three areas of the north basin and the southern end of the middle basin. No NZMS were found in the southernmost part of the middle basin
Allogona townsendiana was used to study the relationship between seasonal weather conditions obta... more Allogona townsendiana was used to study the relationship between seasonal weather conditions obtained from a nearby personal weather station and the activity of land snails. This snail is usually found in isolated, relatively densely populated colonies that are associated with Urtica sp. (stinging nettles), typically near springs and seeps under Acer macrophyllum (bigleaf maple).
DNA and historic records suggest that the occurrence of Pyrgulopsis robusta (Walker, 1908), a nat... more DNA and historic records suggest that the occurrence of Pyrgulopsis robusta (Walker, 1908), a native river snail found in the Snake River basin, was not overlooked by past surveys but has been recently introduced in the Columbia River.
Use of wetland indicator plants to find springs that have the spring snails in the dense forest a... more Use of wetland indicator plants to find springs that have the spring snails in the dense forest and vegetative cover in the Puget Sound basin.
Inter-Areas Component of the River Corridor Baseline Risk Assessment Sampling Summary, 2008
Benthic samples from 27 sites in the Columbia River within the Hanford Reach were collected for a... more Benthic samples from 27 sites in the Columbia River within the Hanford Reach were collected for analysis of their freshwater mollusk and invertebrate fauna during 2006 as part of the U.S. Department of Energy’s River Corridor Ecological Risk Assessment efforts.
Article on a focus stacking setup I built to allow me to use this technique to photograph micro s... more Article on a focus stacking setup I built to allow me to use this technique to photograph micro shells through a microscope.
Freshwater bodies (springs, streams, rivers, and wetlands) are important ecosystems that provide ... more Freshwater bodies (springs, streams, rivers, and wetlands) are important ecosystems that provide food and habitat to a wide range of aquatic and terrestrial species, including invertebrates, and support disproportionately high levels of biodiversity compared to their spatial coverage (Heino et al. 2009). Aquatic invertebrates play an important role in nutrient cycles, primary productivity, decomposition, and translocation of materials. As consumers at intermediate trophic levels, they are influenced by both bottom-‐up and top-‐down forces, serve as the conduits of these forces, and are an important food source for fish. The many roles performed by aquatic invertebrates underscore the importance of their conservation (Wallace and Webster 1996). Aquatic invertebrate assemblages are also good indicators of environmental change because they are long-‐term inhabitants of lotic and lentic systems, relatively immobile, easy to collect, and respond predictably to environmental stresses, whether human induced or climatic. Aquatic invertebrates discussed here are primarily lotic insects and lotic/lentic mollusks. Very little information exists concerning lentic insects in the study area, thus they are not covered here. In general, the species found in the streams and rivers of central and south-‐central Oregon are widely distributed and common in western North America. Endemic or isolated insect species may be found to occur in springs and small streams in the alpine/subalpine zone along the Cascade crest as invertebrates of these habitats have not been well documented. A number of mollusk species with restricted ranges are known from groundwater-‐fed springs in the Deschutes and Klamath basins. Cold springs support aquatic mollusk and some insect species that are exclusively adapted to and confined to this habitat. Climate-‐driven shifts are expected in the diversity and composition of communities as limiting habitat thresholds, such as water temperature, move longitudinally along a river. While many aquatic invertebrate taxa are predicted to contract or expand their range and abundance depending on their habitat tolerance, the most climate change vulnerable habitat types for aquatic invertebrates in central and south-‐central Oregon are the alpine/subalpine streams and wetlands, and forested headwater streams and springs.
As a consequence of the find of the P. antipodarum in Capitol Lake, I was contracted by the Washi... more As a consequence of the find of the P. antipodarum in Capitol Lake, I was contracted by the Washington Invasive Species Council (Washington State Recreation & Conservation Office) to conduct the first survey to determine if there were any additional introductions of P. antipodarum outside of Capitol Lake. The survey covered mapped freshwater bodies within a 5-mile radius of Capitol Lake. Though main purpose of the survey was to find evidence of P. antipodarum introductions outside of Capitol Lake, a secondary result was the first detailed survey of the freshwater mollusk fauna of the region around Capitol Lake. Not much was reported in the literature regarding freshwater mollusk occurrences in the Olympia area. Malacologists such as Henry Hemphill and Junius Henderson conducted surveys in western Washington, which briefly included this area. Branley Branson did extensive surveys in western Washington, but he surveyed immediately adjacent areas in the Cascades and Olympic Peninsula. ...
A recent field survey of the Pit River basin in northeastern California resulted in the discovery... more A recent field survey of the Pit River basin in northeastern California resulted in the discovery of numerous undescribed populations of aquatic rissooidean snails which are treated in this paper. Based on morphological study and analysis of mitochondrial DNA sequences we describe a new species of the genus Colligyrus (family Amnicolidae) and four new species of the genus Pyrgulopsis (Hydrobiidae). Phylogenetic analysis of sequence data suggests that the new species of Colligyrus is sister to an undescribed congener from the Klamath basin. The four new species of Pyrgulopsis do not form a monophyletic group but instead are variously related to other regional congeners. We also describe Pit River basin populations of two species of Pyrgulopsis which were previously considered to be endemic to the northwestern Great Basin (P. eremica) and Klamath basin (P. archimedis).
... PETER A. BOWLER ... Page 2. Page 222 The Veliger, Vol. 37, No. 3 Taylor (1982). Recent fieldw... more ... PETER A. BOWLER ... Page 2. Page 222 The Veliger, Vol. 37, No. 3 Taylor (1982). Recent fieldwork in this region has per-mitted large collections of these two snails, and laboratory studies have suggested that these represent new genera, which we describe below. ...
A total of 31 sites were collected in the north and middle basins of Capitol Lake and one in Perc... more A total of 31 sites were collected in the north and middle basins of Capitol Lake and one in Percivial Creek. Twenty-seven of the sites sampled in Capitol Lake had live NZMS present. Of the 3 sites in the middle basin, 2 had only dead NZMS shells present while the southernmost one had none present. Based on a number of the NZMS at the 27 live sites in the lake a density contour map was drawn. The highest densities of the NZMS occur in the north basin of Capitol Lake from the outlet of the lake at the dam to the east along the shoreline. Additional areas of high densities of the NZMS occur in the southern part of the north basin just north of the railroad grade and along the east bank of the north part of the middle basin. The lowest densities of the NZMS are found in three areas of the north basin and the southern end of the middle basin. No NZMS were found in the southernmost part of the middle basin
Allogona townsendiana was used to study the relationship between seasonal weather conditions obta... more Allogona townsendiana was used to study the relationship between seasonal weather conditions obtained from a nearby personal weather station and the activity of land snails. This snail is usually found in isolated, relatively densely populated colonies that are associated with Urtica sp. (stinging nettles), typically near springs and seeps under Acer macrophyllum (bigleaf maple).
DNA and historic records suggest that the occurrence of Pyrgulopsis robusta (Walker, 1908), a nat... more DNA and historic records suggest that the occurrence of Pyrgulopsis robusta (Walker, 1908), a native river snail found in the Snake River basin, was not overlooked by past surveys but has been recently introduced in the Columbia River.
Use of wetland indicator plants to find springs that have the spring snails in the dense forest a... more Use of wetland indicator plants to find springs that have the spring snails in the dense forest and vegetative cover in the Puget Sound basin.
Inter-Areas Component of the River Corridor Baseline Risk Assessment Sampling Summary, 2008
Benthic samples from 27 sites in the Columbia River within the Hanford Reach were collected for a... more Benthic samples from 27 sites in the Columbia River within the Hanford Reach were collected for analysis of their freshwater mollusk and invertebrate fauna during 2006 as part of the U.S. Department of Energy’s River Corridor Ecological Risk Assessment efforts.
Article on a focus stacking setup I built to allow me to use this technique to photograph micro s... more Article on a focus stacking setup I built to allow me to use this technique to photograph micro shells through a microscope.
Freshwater bodies (springs, streams, rivers, and wetlands) are important ecosystems that provide ... more Freshwater bodies (springs, streams, rivers, and wetlands) are important ecosystems that provide food and habitat to a wide range of aquatic and terrestrial species, including invertebrates, and support disproportionately high levels of biodiversity compared to their spatial coverage (Heino et al. 2009). Aquatic invertebrates play an important role in nutrient cycles, primary productivity, decomposition, and translocation of materials. As consumers at intermediate trophic levels, they are influenced by both bottom-‐up and top-‐down forces, serve as the conduits of these forces, and are an important food source for fish. The many roles performed by aquatic invertebrates underscore the importance of their conservation (Wallace and Webster 1996). Aquatic invertebrate assemblages are also good indicators of environmental change because they are long-‐term inhabitants of lotic and lentic systems, relatively immobile, easy to collect, and respond predictably to environmental stresses, whether human induced or climatic. Aquatic invertebrates discussed here are primarily lotic insects and lotic/lentic mollusks. Very little information exists concerning lentic insects in the study area, thus they are not covered here. In general, the species found in the streams and rivers of central and south-‐central Oregon are widely distributed and common in western North America. Endemic or isolated insect species may be found to occur in springs and small streams in the alpine/subalpine zone along the Cascade crest as invertebrates of these habitats have not been well documented. A number of mollusk species with restricted ranges are known from groundwater-‐fed springs in the Deschutes and Klamath basins. Cold springs support aquatic mollusk and some insect species that are exclusively adapted to and confined to this habitat. Climate-‐driven shifts are expected in the diversity and composition of communities as limiting habitat thresholds, such as water temperature, move longitudinally along a river. While many aquatic invertebrate taxa are predicted to contract or expand their range and abundance depending on their habitat tolerance, the most climate change vulnerable habitat types for aquatic invertebrates in central and south-‐central Oregon are the alpine/subalpine streams and wetlands, and forested headwater streams and springs.
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