1,456 research outputs found
Data for A genetic assessment of the taxonomic status of New Zealand mussels of the genus Xenostrobus Wilson, 1967
No full textFasta format files for the cytochrome c oxidase subunit I and histone H3 alignments used in this article. Authors: Donald J. Colgan Richard C. Willan and Lisa A. KirkendaleSequences are identified by GenBank accession number or registration numbers from the Australian ("C" prefix), Western Australian ("S" prefix) or Museum and Art Gallery of the Northern Territory ("P" prefix)
Camp Century: Firn compaction measurements (CEN-COM)
No full textFirn compaction measurements at Camp Century (CEN-COM)
Contact:
Baptiste Vandecrux ([email protected])
Please cite the following study when using these data:
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Location:
77.18N -61.11E 1886 m a.s.l
Temporal coverage: 2017-08-01 to 2020-01-19
Temporal resolution: daily snapshots
Instrument design:
The instrument were designed by Mike MacFerrin ([email protected]) after “coffee-can” method (Hulbe and Whillans, 1994; Hamilton et al., 1998) to continuously monitor firn compaction, similar to the method used by Arthern et al. (2010). Each instrument is composed of a line with a weight attached to one end and connected to a spring-loaded potentiometer on the other end. The weight is anchored at the bottom of a borehole, and the potentiometer is placed at the top of the borehole. As the borehole shortens due to firn compaction, the potentiometer reels in the string to maintain tension, and a data logger records the length of string that has been reeled in.
The CEN-COM station was first introduced by Colgan et al. (2018) and then described and used in Vandecrux et al. (2021). Please consider citing these two studies if using this data.
References:
Arthern, R.J., Vaughan, D.G., Rankin, A.M., Mulvaney, R., and Thomas, E.R. (2010). In situ measurements of Antarctic snow compaction compared with predictions of models. J. Geophys. Res. 115, 12 PP.
Colgan, W., Pedersen, A., Binder, D., Machguth, H., Abermann, J., and Jayred, M. (2018). Initial field activities of the camp century climate monitoring programme in Greenland. Geol. Surv. of Denmark Greenland Bull. 41, 75–78. doi:10.34194/geusb.v41.4347
Hamilton, G.S., and Whillans, I.M. (2002). Local rates of ice-sheet thickness change in Greenland. Ann. Glaciol. 35, 79–83.
Hulbe, C., & Whillans, I. (1994). A method for determining ice-thickness change at remote locations using GPS. Annals of Glaciology, 20, 263-268. doi:10.3189/1994AoG20-1-263-268
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Instrumental set up:
On 1st of August 2017, three instruments were installed:
Instrument #1: Top at 1.4 m depth, end of line at 62.3 m depth
Instrument #2: Top at 0.0 m depth, end of line at 20.0 m depth
Instrument #3: Top at 0.0m depth, end of line at 5.0 m depth
On the 16th of May 2019, these three intruments were unplugged and two new instruments were inserted:
Instrument #1: Top at 0.0 m depth, end of line at 4.9 m depth (+/- 0.2 m)
Instrument #2: Top at 0.0 m depth, end of line at 7.7 m depth (+/- 0.2 m)
Instrument #5 failed and did not record any data.
Field operators: Liam Colgan, Robert S. Fausto, Allan Ø. Pedersen
Data description:
This folder contains transmissions from the station modem.
The three useful columns are the last three: "INST_1_LENGTH_CORRECTED_M" (and INST_2, INST_3, respectively). This shows the length of the 2-m potentiometer cable over time.
To derive borehole length from these measurements, do this:
INIT_BOREHOLE_LEN = depth (m) of the borehole when it was first drilled at the instrument installed.
INIT_CABLE_LEN = length of the cable (m) at the first full day after the instrument was installed (can check your field notes, or just plot & look at the data to see when the trends begin), from the table
CURRENT_CABLE_LEN = length of the cable (m) on any subsequent day
CURRENT_BOREHOLE_LEN = length of the borehole (m) on any subsequent day
Calculate as such:
CURRENT_BOREHOLE_LEN = INIT_BOREHOLE_LEN - INIT_CABLE_LEN + CURRENT_CABLE_LEN
The first weeks of measurements can be affected by the initial settling of the instrument into the snow.<br
Cancellocochlea Shea & Colgan & Stanisic 2012, n. gen.
No full textCancellocochlea n. gen. Diagnosis. Shell very small, orange brown, biconcave or discoidal/planate with tightly coiled whorls, the last inflated. Protoconch sculpture reticulate (coolongolook) to spiral (heatherae); teleoconch with few sinuate radial ribs; microsculpture cancellate consisting of prominent microradial ribs and low microspiral cords, beaded at their intersection. Aperture narrowly to broadly ovately-lunate. Umbilicus wide U-shaped to wide cup-shaped. Penis tubular with an apical verge that has a lateral pore; longitudinal ridge shaped pilasters present. Epiphallus shorter than penis. Range and habitat. From the Port Stephens area northward to the Manning River drainage basin, NSW; found in rainforest on volcanics, living under logs and rocks. Remarks. Cancellocochlea coolongolook n. sp. and Ca. heatherae n. sp. display significant differences in protoconch sculpture. The protoconch sculpture of Ca. coolongolook has similarities to both Planorbacochlea parriwiensis and P. yessabahensis (both reticulate) while the beaded spiral pattern of Ca. heatherae links it to the Hunter/Port Stephens Planorbacochlea group.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on page 7
Barringtonica Shea & Colgan & Stanisic 2012, n. gen.
No full textBarringtonica n. gen. Type species. Barringtonica polblue n. sp. –here designated. Etymology. For the Barrington Tops. Diagnosis. Shell very small, silky golden brown weakly planispiral to bi-concave with tightly coiled whorls the last inflated, spire slightly to strongly depressed. Protoconch sculpture spiral consisting of low, flattened, broad spiral cords, with distinct radial growth ripples developing near teleoconch junction; teleoconch with numerous prominent radial ribs; microsculpture cancellate with prominent microradial ribs and low microspiral cords. Aperture broadly ovately-lunate. Umbilicus U shaped to wide, cup-shaped. Penis with an expanded apical portion becoming tubular distally. Verge absent, no pilaster formation observed. Distribution and habitat. Known from the volcanics of the western Barrington Tops rainforest massif off the Scone-Gloucester road and in upper Moonan Brook valley, east of Scone, NSW; found in sub-alpine woodland and vine thicket, living under logs and rocks. Remarks. Barringtonica n. gen. is distinguished by the protoconch sculpture of numerous low flattened spiral cords and radial ridges which become prominent on the latter parts of the protoconch. Comboynea n. gen. has similar low spiral cords that are generally fewer in number, and indistinct underlying radial ridges. Anatomically it differs from both Cumberlandica and Planorbacochlea (most species) chiefly by the lack of a penial verge. The absence of any pilaster formation would seem to indicate that the male reproductive system in the material studied was either immature or seasonally under-developed.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on page 6
Richmondaropa Shea & Colgan & Stanisic 2012, n. gen.
No full textRichmondaropa n. gen. Gyrocochlea Hedley, 1924: 215 (in part); Iredale 1937: 322 (in part); Iredale 1941a: 267 (in part); Smith 1992: 190 (in part); Stanisic et al. 2010: 196 (in part). Roblinella Iredale, 1941b: 1 (in part); Smith 1992: 203 (in part). Type species. Gyrocochlea prava Hedley, 1924 —here designated. Etymology. For the Richmond River district, north-eastern NSW. Diagnosis. Shell very small, cinnamon brown, planispiral to slightly biconcave with spire flat to slightly concave. Whorls tightly coiled, the last inflated and descending strongly in front. Protoconch sculpture primarily spiral consisting of 17 to 21 prominent, widely spaced, narrow, continuous spiral cords; vague, very weak, underlying radial ridges present. Teleoconch sculpture of numerous, prominent, widely and uniformly spaced, slightly sinuate, orthocline to strongly prosocline radial ribs; microsculpture cancellate with prominent microradial ribs and low microspiral cords. Aperture shape broadly ovately-lunate. Umbilicus wide, U-shaped to cup-shaped. Epiphallus longer than penis, entering penis through a simple pore (i.e. verge absent). Penis tubular with an expanded apical portion, internally with 2–3 longitudinal pilasters. Distribution and habitat. Sub-coastal volcanics, alluvial flood plains and coastal habitats between the Richmond and Tweed Rivers, north-eastern NSW; found in rainforests, living on undersides of logs. Remarks. Richmondaropa n. gen. is distinguished by having a predominantly spiral protoconch with widely spaced, continuous narrow, spiral cords. Gyrocochlea Hedley, 1924 differs chiefly in having finely cancellate protoconch sculpture with numerous, extremely crowded, beaded spiral cords; Dictyoropa has a reticulate protoconch sculpture with continuous, widely spaced spiral cords; and Macphersonea n. gen. has distinctly latticelike protoconch sculpture and channelled sutures. Richmondaropa appears confined to the coastal and sub-coastal areas of north-eastern NSW area between the Richmond and Tweed Rivers. However, the hinterland, particularly rainforests of the upper Richmond and Nightcap Ranges needs to be further explored to circumscribe fully the geographic range of the genus and constitute species.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on page 8
Five Maine economists: Charles Colgan, Jonathan Reisman, Michael LeVert, J. Scot
No full textFive Maine economists: Charles Colgan, Jonathan Reisman, Michael LeVert, J. Scott Moody, and Laurie Lachance, predict what\u27s in store for Maine in 2010; and, with the exception of LeVert, reflect on the predictions they made last year
Planorbacochlea graemei Shea & Colgan & Stanisic 2012, n. sp.
No full textPlanorbacochlea graemei n. sp. (Figs 15F; 16F; 17F; 18E; 19F) Etymology. Named for the late Graeme Annabel who first collected this species and who made a significant contribution to our knowledge of the terrestrial micro-snails of eastern Australia. Diagnosis. Shell very small, pale orange-brown, biconcave with weakly depressed spire. Protoconch sculpture spiral consisting of 26 prominent, closely spaced, beaded spiral cords and weak, closely spaced radial ridges becoming more pronounced toward the protoconch-teleoconch boundary. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline to weakly prosocline radial ribs. Ribs on body whorl 45–68. Umbilicus wide cup-shaped. Type material examined. Holotype. AM C.462745, Speers Point, Lake Macquarie Reserve, above end of Farm Street, NSW (32 965° S, 151 632° E), 3.viii.2005, coll. G. Annabell. Paratypes. AM C.462740, AM C.462743, AM C.472882, same data as holotype. Description. Shell very small, pale orange-brown, biconcave with weakly depressed spire. Whorls 3.00–3.75, tightly coiled, the last inflated and descending in front. Sutures strongly impressed. Shell diameter 2.66–3.25 mm (mean 2.80 mm), height 1.44–1.58 mm (mean 1.50 mm), H/D 0.49–0.55 (mean 0.53). Protoconch flat, of one whorl, diameter 0.35–0.48 mm. Protoconch sculpture spiral consisting of 26 prominent, closely spaced, beaded spiral cords and weak, closely spaced radial ridges becoming more pronounced toward the protoconch-teleoconch boundary. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline to weakly prosocline radial ribs. Ribs on body whorl 45–68 (mean 54), width of rib interstices on the first teleoconch whorl greater than or equal to width of six ribs; on the penultimate whorl greater than or equal to width of six ribs; each rib with two or more periostracal blades with overlapping thickenings. Interstitial sculpture of low prominent microradial ribs and low, weaker microspiral cords forming weak beads at their intersection; number of microradials between ribs on the first teleoconch whorl 9–18; on first quarter of body whorl 12; height of microspirals very low. Aperture broadly ovately-lunate. Parietal callus prominent, transparent. Umbilicus wide cup-shaped, diameter 0.74–0.99 mm (mean 0.85 mm), D/U 3.30–3.62 (mean 3.40). Based on 5 measured adults. Anatomy unknown. Distribution and habitat. Known only from the type locality at Speers Point, in littoral rainforest; recovered from litter. Remarks. Planorbacochlea graemei n. sp. is readily separated from all others in the P. hawkesburyana complex by the combination of very widely spaced radial ribs on the teleoconch and fewer spiral cords on the protoconch.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on page 5
Cumberlandica Shea & Colgan & Stanisic 2012, n. gen.
No full textCumberlandica n. gen. Gyrocochlea Hedley, 1924: 215 (in part); Iredale 1937: 322 (in part); Iredale 1941a: 267 (in part); Smith 1992: 190 (in part); Stanisic et al. 2010: 196 (in part). Type species. Gyrocochlea impressa Hedley, 1924 —here designated. Etymology. Named for the County of Cumberland, Sydney, which is at the centre of the distribution of the genus. Diagnosis. Shell very small, brown with a deeply biconcave to almost flat spire, and tightly and evenly coiled whorls. Protoconch sculpture of many, widely spaced spiral cords and curved radial ribs that form on its latter part, becoming more pronounced toward the teleoconch boundary; teleoconch sculptured with numerous well developed, widely spaced radial ribs; microsculpture cancellate consisting of fine microradial ribs and low microspiral cords. Umbilicus wide U-shaped to cup-shaped. Epiphallus as long as penis; penis pear-shaped with apical verge and long tapering distal portion; penial verge large, open and convoluted with a lateral slit; longitudinal pilasters distally; vagina long. Distribution and habitat. Sydney Basin, specifically the Hawkesbury-Nepean drainage, between Terrigal in the north, Mt Wilson in the upper Blue Mountains in the west and the Wombeyan limestones in the south; found in subtropical to warm temperate rainforest, moist sclerophyll forest, dry or littoral vine thicket, living on the underside of logs, wood and rocks, often in groups. Remarks. Cumberlandica n. gen. is endemic to the Sydney Basin. It is readily distinguished from Gyrocochlea s.s. by (1) its bi-modal protoconch sculpture (spiral lirae at the beginning and radial ribs toward the end)— Gyrocochlea s.s. having only very finely cancellate sculpture. (2) more evenly coiled whorls—the last whorl greatly expanded in Gyrocochlea s.s. and (3) and a more widely open umbilicus. Diphyoropa Hyman & Stanisic, 2005 has a grossly similar bi-modal protoconch sculpture, however in this genus the spirals are much bolder and more widely spaced and the radials less prominent, low ridges. Cumberlandica is distinguished from the broadly sympatric Planorbacochlea n. gen. by the protoconch sculpture (finely spiral in the latter) and in having a larger shell (Table 3) with more numerous and more evenly coiled whorls. Anatomically, the characteristic features of Cumberlandica are the elongate pallial wall, numerous long finger-like alveoli, large prominent talon, tightly entwined epiphallus/penial retractor, broad oval or pear shaped penis with long tapering distal portion, large open and convoluted penial verge and long vagina. The inclusion of Cu. wilsoniana n. sp. in the genus is tentative and subject to further investigation. An SEM of the protoconch was not taken but optical microscopy revealed a pattern of radial ribs and very weak spirals. The protoconch sculpture specifically (prominent radial ribs and weak spirals), coiling pattern and aperture shape of this species are not representative of the general patterns displayed by other Cumberlandica species. No soft parts of this species were available for anatomical or molecular studies. Given its refugial, mountain-top existence, this species may eventually be shown to represent a new genus.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on pages 23-2
Planorbacochlea Shea & Colgan & Stanisic 2012, n. gen.
No full textPlanorbacochlea n. gen. Gyrocochlea Hedley, 1924: 215 (in part); Iredale 1937: 322 (in part); Iredale 1941a: 267 (in part); Smith 1992: 190 (in part); Stanisic et al. 2010: 196 (in part). Type species. Gyrocochlea hawkesburyana Stanisic, 2010 —here designated. Etymology. From the Latin planus = flat, orbis = disc and cochlea = snail. Diagnosis. Shell very small to small, brownish, with a weakly to strongly depressed spire and tightly coiled whorls, the last inflated. Protoconch sculpture of prominent crowded, beaded spiral cords and low radial undulations (P. hawkesburyana, P. planorbis), or with more widely spaced spiral cords and equally high, narrow, widely spaced radial ribs (P. reticulata) to widely reticulate with widely spaced non-beaded, spiral cords and broad radial ribs of equal prominenence (P. parriwiensis, P. yessabahensis and P. nambucca). Teleoconch with numerous well developed, widely to very closely spaced, prominent radial ribs; microsculpture cancellate with prominent microradial ribs and low microspiral cords. Aperture broadly, ovately-lunate. Umbilicus U-shaped to wide cupshaped. Penis tubular to pear-shaped, with longitudinal pilasters distally, with an apical verge that has a lateral or terminal pore or without a verge (P. nambucca, P. reticulata). Epiphallus generally as long as penis. Distribution and habitat. Sydney Basin north to the Nambucca River drainage, NSW; found in a variety of habitats including dry sclerophyll forest but more commonly in vine thicket/rainforest associations, usually in small groups living on the undersides of logs and timber. Remarks. Planorbacochlea n. gen. Differs from Cumberlandica primarily on general shell form and in the sculpture of the protoconch. Planorbacochlea has a more tightly coiled whorl profile with inflated last whorl and strongly spiral to reticulate protoconch sculpture. Cumberlandica has evenly coiled whorls and a protoconch that has bi-modal sculpture consisting of spirals initially and dominant radials on the latter part. Planorbacochlea is a geographically widespread and diverse group when compared with other genera dealt with here. It is also considered highly problematic in composition. While the DNA results identify the group as coherent, the protoconch and anatomical data show a number of significant anomalies. The protoconch sculpture in Sydney Basin Planorbacochlea and P. planorbis generally exhibits a spiral pattern comprising closely spaced, fine beaded spiral cords (but less closely spaced then in Gyrocochlea s.s.) and weak radial ridges. However, in P. parriwiensis n. sp. (sympatric with P. hawkesburyana n. sp.), P. yessabahensis n. sp., P. nambucca n. sp. P. reticulata n. sp. and P. dandahra n. sp. the protoconch sculpture is reticulate and is comprised of spiral cords that are more widely spaced and more prominent widely spaced radial elements. Furthermore, P. nambucca n. sp., in lacking a penial verge, also differs radically in reproductive tract morphology from all other species in the group. These morphological differences are of the same order of magnitude as those between other genera treated here. Considering the difficulty with the collection of these charopids in the field alluded to earlier, there is a reasonable likelihood that additional species, yet to be discovered, exist within the broad landscape currently defined by the Planorbacochlea distribution. These may yet assist in adequately defining Planorbacochlea. However, additional fieldwork, which was outside the resources of the current study, is needed to resolve this problem. Further north in the Clarence and Richmond River drainages, and in the Border Ranges, there are also yet-tobe described species which could be embraced in the general concept of this genus as it currently stands. However, the differences in the fine detail of the reticulate protoconch sculpture in these species are also such as to suggest that they represent separate lineages from Planorbacochlea. Their inclusion in the genus would lead to a situation similar to that of Gyrocochlea s.l., which the current study seeks to unravel.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on pages 36-3
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