Letteratura scientifica selezionata sul tema "Macquarie River (N.S.W.)"

A number of morphological attributes are commonly assumed to serve as surrogates for properties that cannot be practically measured on a routine basis This study investigates whether conventional soil morphology can be used for predicting soil properties of relevance to irrigated and dryland agriculture in the lower Macquarie Valley, N S W Measurements from 224 profiles were used to develop regression equations with morphological properties as explanatory variables Response variables included gravimetric moisture contents at -10 and -1500 kPa, available water capacity, ail-filled porosity, ESP, dispersion index, the coefficient of linear extensibility, bulk density and CEC The relationships between field texture and particle size classes were also determined Conventional sod morphology provided only moderate predictions of the agronomically more important properties In the lower Macquarie Valley, texture and colour were the most useful explanatory variables Most of the remaining morphological properties, and in particular conventional descriptors of structure, contributed little to improving prediction Options for more cost-effective and direct measurements, especially of profile macrostructure are considered.

Genus Epikastea Liebke 1936, of the Plochionida Group of Subtribe Agrina, Lebiini, with six species is revised. Subtribe Agrina consists of those species formerly included in the Subtribe Calleidina. The species of Epikastea Liebke 1936 are diagnosed, described, and illustrated. One species occurs in Costa Rica; five are new South American species and are here assigned to this genus. The five new species described are: Epikastea biolat Erwin, n. sp. (PER , MADRE DE DIOS, Rio Manu, BIOLAT Biodiversity Station, Pakitza Guard Station, 356m, 11 56 47 S, 071 17 00 W), Epikastea grace Erwin, n. sp. (PER , LORETO, Samiria River, Camp Manco Capac, 04 43 0 S, 074 18 0 W), Epikastea mancocapac Erwin, n. sp. (PER , LORETO, Samiria River, Camp Manco Capac, 04 43 0 S, 074 18 0 W), Epikastea piranha Erwin, n. sp. (ECUADOR. ORELLANA, Hauorani Territory, Camp Pira a, 0 39' 25.685" S, 76 27' 10.813" W), Epikastea poguei Erwin, n. sp. (PER , MADRE DE DIOS, Rio Manu, BIOLAT Biodiversity Station, Pakitza Guard Station, 356m, 11 56 47 S, 071 17 00 W). A definition of the Plochionida Group and an identification key to the Western Hemisphere genera included are provided. A key to the known species of Epikastea Liebke is given. Distribution data are provided for all species and a map is provided for the Costa Rican taxon. Adults of Epikastea Liebke have been found on rotting logs in rainforests and fogged from the canopy of tropical trees and palms.

The drivers that determine the hydrological connectivity (HC) are complex and interrelated, and disentangling this complexity will improve the administration of the river–lake interconnection system. Dongting Lake, as a typical river–lake interconnected system, is freely connected with the Yangtze River and their HC plays a major role in keeping the system healthy. Climate, hydrology, and anthropogenic activities are associated with the HC. In this study, hydrological drivers were divided into the total flow of three inlets (T-flow) and the total flow of four tributaries (F-flow). To elucidate the HC of the Dongting Lake, HC was calculated by geostatistical methods in association with Sentinel-2 remote sensing images. Then, the structural equation model (SEM) was used to quantify the impacts of hydrology (F-flow, and T-flow) and meteorology (precipitation, evaporation, and temperature) on HC. The geostatistical analysis results demonstrated that the HC showed apparent seasonal change. For East and West Dongting Lake, the dominant element was north–south hydrological connectivity (N–S HC), and the restricted was west–east hydrological connectivity (W-E HC), but the dominant element was E–W HC and the restricted was N–S HC in South Dongting Lake. The results of SEM showed that N–S HC was mainly explained by T-flow (r = 0.49, p < 0.001) and F-flow (r = 0.28, p < 0.05). T-flow, temperature (r = 0.33, p < 0.05), and F-flow explained E–W HC. The finding of this work supports the management of both the Dongting Lake floodplain and other similar river–lake floodplain systems.

The family Bathylagidae contains eight genera and 22 species, of which only five occur in the Southwest Atlantic. Until recently, only adult specimens of the bathylaginin Melanolagus bericoides had been recorded off southern Brazil, between the Santa Marta Cape and Rio Grande (31° S and 49° W). The present work reports the first occurrence of Dolicholagus longirostris larvae on the northern Brazilian coast, expanding its distribution in the Southwest Atlantic. The two specimens found were collected near the mouth of the Amazon River (02° 00' 19" N, 47° 03' 30" W, and 00° 49' 06" N, 46° 25' 09" W).

Seven new species of Argia are described, five of which occur in Costa Rica: Argia calverti n. sp. (Holotype ♂, Costa Rica, Cartago Prov., Tapantí Reserve, 1,310 m, 6 vii 1963, F. G. Thompson leg., in FSCA); Argia carolus n. sp. (Holotype ♂, Costa Rica, San José Prov., El Rodeo Biological Reserve, 7 km W of Villa Colón, 9°54' N, 84°16' W, 561 m, 10–13 vii 1990, T. W. Donnelly leg., in FSCA); Argia elongata n. sp. (Holotype ♂, Costa Rica, Cartago Prov., Reventazón river, SE of Turrialba by highway 10, 9°52'56'' N, 83°38'49'' W, 561 m, 10 viii 1979, R. W. & J. A. Garrison leg., in CSCA); Argia haberi n. sp. (Holotype ♂, Costa Rica, San José Prov., Bosque del Tolomuco, km 118 on Pan American highway, in seeps and trickles through brushy pasture on forested hillside, 9°28'18'' N, 83°41'48'' W, 1,710 m, 27 iii 2006, F. Sibley leg., in FSCA); Argia schorri n. sp. (Holotype ♂, Costa Rica, Puntarenas Prov., 2.8 mi E of Golfito, 8°39' N, 83°7' W, 35 m, 4 vii 1967, O. S. Flint, Jr. & M. A. Ortiz B. leg., in USNM), and two which are so far only known from Mexico and Ecuador respectively: Argia rudolphi n. sp. (Holotype ♂, Mexico, Puebla State, Zihuateutla, Sierra de Huauchinango, La Unión, in drainage area, 20°14'25'' N, 97°53'38'' W, 596 m, 21 v 1987, R. Novelo & A. Gómez leg., in CSCA) and Argia schneideri n. sp. (Holotype ♂, Ecuador, Napo Prov., Las Palmas, on Anzu river in Napo river watershed, 11 xii 1936, W. Clark-MacIntyre leg., in UMMZ). All the new species, as well as closely related species needed for diagnosis including A. anceps Garrison, A. cupraurea Calvert, A. cuprea (Hagen), A. extranea (Hagen), A. fissa Selys, A. fulgida Navás, A. oenea Hagen in Selys, A. popoluca Calvert, A. rhoadsi Calvert, and A. westfalli Garrison, are illustrated and diagnosed from their congeners and their known distribution areas are mapped.

A Pygmy Shrew, Sorex hoyi, was captured in a pitfall trap on the Blackstone River (65°04.6'N, 138°10.8'W) in central Yukon. This represents a northern range extension of about 110 km for S. hoyi in the Yukon.

Miller, J. J., Curtis, T. W., Bremer, E., Chanasyk, D. S. and Willms, W. D. 2013. Evaluation of selected soil properties for indicating cattle activity at off-stream watering and river access sites in southern Alberta. Can. J. Soil Sci. 93: 343–358. Off-stream watering troughs may reduce surface water pollution by shifting nutrient distribution from natural watering sites along the river to around artificial water troughs some distance from the river. The objective of our study was to evaluate the suitability of nine soil properties for assessing the impacts of cattle activity adjacent to eight watering sites. Nine surface (0–5 cm) soil properties were evaluated along four 100-m transects at the five off-stream water troughs and three river access sites along the Lower Little Bow River in southern Alberta over 4 yr (2007–2010). The properties included P (total P, soil test P or STP), N (total N, NO3-N, NH4-N), total C, total C:total N ratio (TC:TN), chloride (Cl), and soil bulk density. Soil test P was significantly (P≤0.05) enriched at 65% of site-year comparisons, followed by total C (63%), NO3-N (55%), total P and TC:TN (50%). This suggested that these soil properties were relatively good indicators of cattle activity at the majority (>50%) of watering sites. Chloride was a valid indicator only in non-saline areas (100% of four non-saline sites). Total C and TC:TN ratios were not valid indicators in the calcareous soils at all sites because of possible confounding influence of inorganic C. Overall, we recommend Cl as an indicator of cattle activity at watering sites not affected by soil salinity and high natural Cl levels, and STP as the best overall indicator of cattle activity at off-stream watering sites and river access sites. Certain soil properties were also influenced by distance from watering site, stocking rate, precipitation, and age of water trough.

The Australian endemic humicolous and hygropetric water beetle genus Tympanogaster Perkins, 1979, is revised, based on the study of 7,280 specimens. The genus is redescribed, and redescriptions are provided for T. cornuta (Janssens), T. costata (Deane), T. deanei Perkins, T. macrognatha (Lea), T. novicia (Blackburn), T. obcordata (Deane), T. schizolabra (Deane), and T. subcostata (Deane). Lectotypes are designated for Ochthebius labratus Deane, 1933, and Ochthebius macrognathus Lea, 1926. Ochthebius labratus Deane, 1933, is synonymized with Ochthebius novicius Blackburn, 1896. Three new subgenera are described: Hygrotympanogaster new subgenus (type species Tympanogaster (Hygrotympanogaster) maureenae new species; Topotympanogaster new subgenus (type species Tympanogaster (Topotympanogaster) crista new species; and Plesiotympanogaster new genus (type species Tympanogaster (Plesiotympanogaster) thayerae new species. Seventy-six new species are described, and keys to the subgenera, species groups, and species are given. High resolution digital images of all primary types are presented (online version in color), and geographic distributions are mapped. Male genitalia, representative spermathecae and representative mouthparts are illustrated. Scanning electron micrographs of external morphological characters of adults and larvae are presented. Selected morphological features of the other members of the subtribe Meropathina, Meropathus Enderlein and Tympallopatrum Perkins, are illustrated and compared with those of Tympanogaster. Species of Tympanogaster are typically found in the relict rainforest patches in eastern Australia. Most species have very limited distributions, and relict rainforest patches often have more than one endemic species. The only species currently known from the arid center of Australia, T. novicia, has the widest distribution pattern, ranging into eastern rainforest patches. There is a fairly close correspondence between subgenera and microhabitat preferences. Members of Tympanogaster (s. str.) live in the splash zone, usually on stream boulders, or on bedrock stream margins. The majority of T. (Hygrotympanogaster) species live in the hygropetric zone at the margins of waterfalls, or on steep rockfaces where water is continually trickling; a few rare species have been collected from moss in Nothofagus rainforests. Species of T. (Plesiotympanogaster) have been found in both hygropetric microhabitats and in streamside moss. The exact microhabitats of T. (Topotympanogaster) are unknown, but the morphology of most species suggests non-aquatic habits; most specimens have been collected in humicolous microhabitats, by sifting rainforest debris, or were taken in flight intercept traps. Larvae of hygropetric species are often collected with adults. These larvae have tube-like, dorsally positioned, mesothoracic spiracles that allow the larvae to breathe while under a thin film of water. The key morphological differences between larvae of Tympanogaster (s. str.) and those of Tympanogaster (Hygrotympanogaster) are illustrated. New species of Tympanogaster are: T. (s. str.) aldinga (New South Wales, Dorrigo National Park, Rosewood Creek), T. (s. str.) amaroo (New South Wales, Back Creek, downstream of Moffatt Falls), T. (s. str.) ambigua (Queensland, Cairns), T. (Hygrotympanogaster) arcuata (New South Wales, Kara Creek, 13 km NEbyE of Jindabyne), T. (Hygrotympanogaster) atroargenta (Victoria, Possum Hollow falls, West branch Tarwin River, 5.6 km SSW Allambee), T. (Hygrotympanogaster) barronensis (Queensland, Barron Falls, Kuranda), T. (s. str.) bluensis (New South Wales, Blue Mountains), T. (Hygrotympanogaster) bondi (New South Wales, Bondi Heights), T. (Hygrotympanogaster) bryosa (New South Wales, New England National Park), T. (Hygrotympanogaster) buffalo (Victoria, Mount Buffalo National Park), T. (Hygrotympanogaster) canobolas (New South Wales, Mount Canobolas Park), T. (s. str.) cardwellensis (Queensland, Cardwell Range, Goddard Creek), T. (Hygrotympanogaster) cascadensis (New South Wales, Cascades Campsite, on Tuross River), T. (Hygrotympanogaster) clandestina (Victoria, Grampians National Park, Golton Gorge, 7.0 km W Dadswells Bridge), T. (Hygrotympanogaster) clypeata (Victoria, Grampians National Park, Golton Gorge, 7.0 km W Dadswells Bridge), T. (s. str.) cooloogatta (New South Wales, New England National Park, Five Day Creek), T. (Hygrotympanogaster) coopacambra (Victoria, Beehive Falls, ~2 km E of Cann Valley Highway on 'WB Line'), T. (Topotympanogaster) crista (Queensland, Mount Cleveland summit), T. (Hygrotympanogaster) cudgee (New South Wales, New England National Park, 0.8 km S of Pk. Gate), T. (s. str.) cunninghamensis (Queensland, Main Range National Park, Cunningham's Gap, Gap Creek), T. (s. str.) darlingtoni (New South Wales, Barrington Tops), T. (Hygrotympanogaster) decepta (Victoria, Mount Buffalo National Park), T. (s. str.) dingabledinga (New South Wales, Dorrigo National Park, Rosewood Creek, upstream from Coachwood Falls), T. (s. str.) dorrigoensis (New South Wales, Dorrigo National Park, Rosewood Creek, upstream from Coachwood Falls), T. (Topotympanogaster) dorsa (Queensland, Windin Falls, NW Mount Bartle-Frere), T. (Hygrotympanogaster) duobifida (Victoria, 0.25 km E Binns, Hill Junction, adjacent to Jeeralang West Road, 4.0 km S Jeerelang), T. (s. str.) eungella (Queensland, Finch Hatton Gorge), T. (Topotympanogaster) finniganensis (Queensland, Mount Finnigan summit), T. (s. str.) foveova (New South Wales, Border Ranges National Park, Brindle Creek), T. (Hygrotympanogaster) grampians (Victoria, Grampians National Park, Epacris Falls, 2.5 km WNW Halls Gap), T. (Hygrotympanogaster) gushi (New South Wales, Mount Canobolas Park), T. (s. str.) hypipamee (Queensland, Mount Hypipamee National Park, Barron River headwaters below Dinner Falls), T. (s. str.) illawarra (New South Wales, Macquarie Rivulet Falls, near Wollongong), T. (Topotympanogaster) intricata (Queensland, Mossman Bluff Track, 5–10 km W Mossman), T. (s. str.) jaechi (Queensland, Running Creek, along road between Mount Chinghee National Park and Border Ranges National Park), T. (Topotympanogaster) juga (Queensland, Mount Lewis summit), T. kuranda (Queensland, Barron Falls, Kuranda), T. (s. str.) lamingtonensis (Queensland, Lamington National Park, Lightening Creek), T. (s. str.) magarra (New South Wales, Border Ranges National Park, Brindle Creek), T. (Hygrotympanogaster) maureenae (New South Wales, Back Creek, Moffatt Falls, ca. 5 km W New England National Park boundary), T. (Hygrotympanogaster) megamorpha (Victoria, Possum Hollow falls, W br. Tarwin River, 5.6 km SSW Allambee), T. (Hygrotympanogaster) merrijig (Victoria, Merrijig), T. (s. str.) millaamillaa (Queensland, Millaa Millaa), T. modulatrix (Victoria, Talbot Creek at Thomson Valley Road, 4.25 km WSW Beardmore), T. (Topotympanogaster) monteithi (Queensland, Mount Bartle Frere), T. moondarra (New South Wales, Border Ranges National Park, Brindle Creek), T. (s. str.) mysteriosa (Queensland), T. (Hygrotympanogaster) nargun (Victoria, Deadcock Den, on Den of Nargun Creek, Mitchell River National Park), T. (Hygrotympanogaster) newtoni (Victoria, Mount Buffalo National Park), T. (s. str.) ovipennis (New South Wales, Dorrigo National Park, Rosewood Creek, upstream from Coachwood Falls), T. (s. str.) pagetae (New South Wales, Back Creek, downstream of Moffatt Falls), T. (Topotympanogaster) parallela (Queensland, Mossman Bluff Track, 5–10 km W Mossman), T. (s. str.) perpendicula (Queensland, Mossman Bluff Track, 5–10 km W Mossman), T. plana (Queensland, Cape Tribulation), T. (Hygrotympanogaster) porchi (Victoria, Tarra-Bulga National Park, Tarra Valley Road, 1.5 km SE Tarra Falls), T. (s. str.) precariosa (New South Wales, Leycester Creek, 4 km. S of Border Ranges National Park), T. (s. str.) protecta (New South Wales, Leycester Creek, 4 km. S of Border Ranges National Park), T. (Hygrotympanogaster) punctata (Victoria, Mount Buffalo National Park, Eurobin Creek), T. (s. str.) ravenshoensis (Queensland, Ravenshoe State Forest, Charmillan Creek, 12 km SE Ravenshoe), T. (s. str.) robinae (New South Wales, Back Creek, downstream of Moffatt Falls), T. (s. str.) serrata (Queensland, Natural Bridge National Park, Cave Creek), T. (Hygrotympanogaster) spicerensis (Queensland, Spicer’s Peak summit), T. (Hygrotympanogaster) storeyi (Queensland, Windsor Tableland), T. (Topotympanogaster) summa (Queensland, Mount Elliott summit), T. (Hygrotympanogaster) tabula (New South Wales, Mount Canobolas Park), T. (Hygrotympanogaster) tallawarra (New South Wales, Dorrigo National Park, Rosewood Creek, Cedar Falls), T. (s. str.) tenax (New South Wales, Salisbury), T. (Plesiotympanogaster) thayerae (Tasmania, Liffey Forest Reserve at Liffey River), T. (s. str.) tora (Queensland, Palmerston National Park), T. trilineata (New South Wales, Sydney), T. (Hygrotympanogaster) truncata (Queensland, Tambourine Mountain), T. (s. str.) volata (Queensland, Palmerston National Park, Learmouth Creek, ca. 14 km SE Millaa Millaa), T. (Hygrotympanogaster) wahroonga (New South Wales, Wahroonga), T. (s. str.) wattsi (New South Wales, Blicks River near Dundurrabin), T. (s. str.) weiri (New South Wales, Allyn River, Chichester State Forest), T. (s. str.) wooloomgabba (New South Wales, New England National Park, Five Day Creek).

Two distinct species have been recently recognized for the genus Sotalia: S. fluviatilis, occurring in the Amazon River basin, and S. guianensis, from Honduras (15°58′N and 85°42′W) to Santa Catarina State (Florianópolis, southern Brazil—27°35′S and 48°34′W). For the first time the sternum and the appendicular skeleton of the two species of the genus Sotalia are compared. A comparative osteological work was performed with marine samples (from the States of Ceará, north-eastern and Santa Catarina, southern regions of Brazil) and riverine samples (Amazonas State) in relation to metric characters (scapula, flipper and sternum). There was a clear distinction of two species in relation to postcranial skeleton in the morphometric analysis (canonical variate analysis) presented. The flipper and the glenoid cavity of the scapula were proportionally wider in the fluvial species. The sternum, however, was smaller in this species in relation to the maximum width of the manubrium. Nevertheless, this structure still needs to be further studied.

Abstract The Institute for Nuclear Safety and Protection (IPSN) launched the « Tournemire » program, in 1988. One of its aims is to understand and characterize the fluid transfer processes in argillaceous rocks. They are interesting rocks for the long-term storage of nuclear waste. To this purpose, the IPSN installed an experimental site in a tunnel, which gives access to a 250 m-thick Toarcian and Domerian shale unit near Tournemire (Aveyron, France) (fig. 1). The fluids, in this type of rock with very low intrinsic permeability, 10−14 m/s [Boisson et al., 1998], used to flow (calcite crystallizations in fractures), and still flow, principally in the fractures [Barbreau et Boisson, 1993 ; Boisson, 1995] formed during the tectonic history of the formation. In order to constrain the history of fluid flow in the formation, it was necessary to characterize the tectonic fracturing and to identify the tectonic events responsible, on the one hand, for the apparition of the fractures and, on the other hand, for their eventual reactivation. The method used was a microtectonic and kinematic analysis. The studied area belongs to the western border of the Causses basin, a Permian-Mesozoic basin trending N-S. The slightly monoclinal series in this area range from the Trias, discordant westward on the Permian formations of the St-Affrique basin, to the lower Kimmerigian locally present on the Larzac plateau (fig. 1). The upper Liassic shales (Domerian, Toarcian) are between two limestone and dolomite formations. Two major (regional-scale) ESE-WNW reverse faults, the Cernon fault and the St-Jean-d’Alcapies fault, cross the area. Their offsets may reach several hundred meters. These two faults limit an ESE-WNW trending block where the experimental site is located. The tectonic fractures in the area result from two main tectonic phases. Phase 1, extensional, occurred during the Mesozoic and comprises three episodes (fig. 2). The first episode, characterised by an E-W extension (fig. 3), did not produce significant structures in the Toarcian shales. The second episode, with a NW-SE extension direction (fig. 4 and fig. 5), occurred during the diagenesis of the shales. It led to the development of calcareous nodules. These nodules are considered to be « mode I » fractures formed in association with fluid expulsion during the sediment compaction (fig. 4). The last episode has a N-S direction, (fig. 7) and is probably late Jurassic in age [Macquar, 1973 ; Blès et al., 1989 ; Martin et Bergerat, 1996]. It produced E-W conjugate normal faults (fig. 6) and two perpendicular sets of extensional joints trending E-W and N-S. The second major tectonic phase corresponds to the « pyrenean » compression. The σ1 directions vary from NE-SW to NW-SE, with two major pulses striking N020-N030 and N160-N170 (fig. 2, fig. 9 and fig. 10). The N020-N030 direction corresponds to the paroxysm of the « pyrenean » phase, dated as late Middle Eocene [Arthaud et Laurent., 1995]. It reactivated major faults and formed associated folds (fig. 8). Numerous fractures due to the N160-170 compressional event are concentrated principally in the center of the block bordered by the ESE-WNW major faults (fig. 2). Chronological criteria indicate that the direction of compression rotated counter-clockwise during the « pyrenean » compressional phase (fig. 11). A third compression direction (N130) has been evidenced, for example, by N030 trending tension gashes cross-cut by N130 trending gashes (fig. 12). The significance of this last tectonic event is unclear. It is mainly observed in the west drift of the experimental site (fig. 1C), and could result of the re-orientation of the stresses at this site close to an important shear zone. Three sets of joints, trending N020, N160 and N090 (fig. 13 and fig. 14) have been recognized. The joints are classically extensional fractures that propagate perpendicular to the minimum principal stress σ3 [Endelger, 1985 ; Pollard et Aydin, 1988 ; Rives, 1992]. In strike-slip regimes, such fractures strike parallel to the maximum principal stress σ1. The average N020, N160 and N090 joints thus very probably are created respectively during the N020 pyrenean strike-slip event, N160 strike-slip event and N-S Mesozoic extension. The established chronology between the different compressional episodes involves the reactivation of the N020 and N160 fractures may have caused only senestral strike slip. However, the presence of dextral strike slip on some vertical planes trending N-S, not associated with conjugate planes but with E-W vertical planes indicates their origin is not related to the « Pyrenean » phase. Consequently, we assumed that a set of N-S joints created during the extensive phase, in the same time as the E-W joints. An elasticity theory model gives an account of field observations on this type of fractures. The model proposed by Caputo [1995] describes the geometry of networks, of joints as a function of the tectonic regime (fig. 15). Two coeval sets of joints form under the same tectonic event. For an extensive stress state, the two sets are orthogonal to each other. Under strike slip regimes, two orthogonal sets form but one of the two sets forms horizontally (parallel to the bedding planes when the stratification is horizontal). The mechanism involves a stress permutation between σ3 and σ2 in the vicinity of the first fracture zone at the moment of failure. The network of orthogonal joints (N-S and E-W) appeared under the N-S extensive event. We show two sets of joints with the same orientation formed at two different ages (fig. 16). Their differentiation was possible with the chronology of the deformation, which was determined by the microtectonic analysis. The pre-existing fractures, originated before the « pyrenean » phase, necessarily influenced the expression and the distribution of the fractures associated with the « pyrenean » phase. These pre-existing fractures must be taken into account to understand and constrain the fluid circulations in the Toarcian shales.

Archaeological evidence indicates that, during the final halfcentury of the life of the city, the area directly annexed by the military was significantly larger than the original excavators realized. In addition to concentrations of soldiers around the gates and defences, and at various places within the ‘civil’ town, the military came to control a single continuous swathe of the urban interior, comprising the entire N part of the walled area from the W defences to the river cliffs, and extending as far as the S end of the Citadel, plus the floor of the inner wadi right down to Lower Main St opposite the (by Durene standards) showy C3 bath, which it also apparently built. This area totals c.13.5 ha (c.33 acres)—a literal quarter of the intramural area which today covers c.52 ha (c.118 acres, measured from the CAD plan of the city by Dan Stewart; both city and base were slightly bigger in antiquity, before loss of the River Gate and parts of the Citadel). In its final form, the base included several distinct zones (Pl. XXIII). The NW part of the city had become a military enclosure, bounded on the E side by a continuous wall down the W side of G St, incorporating the street facades of the E3 bath and E4 house. On the S it was defined by the ‘camp wall’ from the city defences to D St; with no sign of a wall across blocks F5 or F7, the perimeter between D and F Sts is inferred. It must be presumed that, as to the W, the 8th-St-fronting properties of the two blocks were taken over, but that the party walls comprising the boundary with civil housing to the S was not further elaborated. These lines converged on the amphitheatre, which formed the corner of the enclosure. This perimeter of the NW enclosure involved physically blocking Wall, A, C, D, and 10th Sts. A major entrance was on 8th St, at G St between the amphitheatre and the E4 house.

The N end of the city’s plateau zone E of G St, bounded by the N wadi, the river cliff, and the head of the inner wadi, comprising the remotest corner within the walls, also became part of the Roman military quarter. Here, as across the whole N part of the city, the stratigraphy is shallow, rarely deeper than a metre, with bedrock showing in places. Surface indications and magnetometry suggest that much of the region had been built up in pre-Roman times, although there may have been areas of open ground. The street grid had been substantially laid out here, especially H St which ran to the N city wall, but E of this line it seems partly to break down. In particular, in the nominal areas of projected block positions X1–X8, 10th St actually curved off-grid to the S, probably preserving the line of an early approach road to the N end of the Citadel before the stronghold was separated from the plateau by a great quarry and rebuilt. This far N region was presumably mostly residential before AD 165, except for two known sanctuaries beside H St: the so-called Dolicheneum in X7, and a temple of unknown dedication in X9. Under Roman rule it became dominated by insertion of the massive residence known as the ‘Palace of the dux ripae’, here referred to as the Roman Palace. Closures of both G and I Sts on the N side of 10th St, by the building of Roman structures across them, indicates that the zone N of this line became a military enclosure. This was accessible from the civil town only via an entrance on H St, and from the W part of the base area on the plateau, already enclosed by a boundary along the W side of G St, via a smaller entrance on the diverted line of ‘12th St’ at the N-most point of block E3. Within the re-entrant to the continuous base perimeter created by the G St and 10th St lines, more blocks appear to have been taken over by the military.

We now consider how the military base area operated, as a zone where a large number of people lived and worked on a routine basis. On one hand, to function it required the affordances of its internal communications, connections with the civil town, and access to roads, river, and lands beyond the walls; on the other, there was a need for surveillance and control of activities within the base, and of movements across its boundary. The most obvious part of the base boundary (Plate XXII) is the substantial mud brick wall ploughed across four blocks from the city defences just S of Tower 21, and blocking Wall, A, C, and D Sts, with a gate established at B St. How the S boundary was defined E of D St has always remained an issue. If it was necessary to build a wall at the W end, why was this not simply continued all the way to, e.g., the S end of the Citadel? Across blocks F7 and F5 it seems that the boundary of the military zone simply comprised party walls between military and civilian-occupied structures. The same was true within block B2, by the Citadel, although the boundary probably comprised building frontages along Lower Main St. On the plateau, as the camp wall may have been a subsequent local enhancement, except where the amphitheatre formed part of it, the boundary may generally have comprised the rear walls of military-held houses lining the S side of 8th St—probably all properties from the city wall to H St. The course of the boundary along the W side of the inner wadi is unknown, but the base is suggested, as along 8th St, to have incorporated at least all properties lining the S side of the Wadi Ascent Road, if not encompassing all blocks on the wadi slope—in which case the boundary here may rather have comprised property frontages on K St. The base area was split by site topography into two major zones, the flat plateau, and the N branch of the inner wadi around the Citadel. Each was further subdivided.

From the junction of H and 8th Sts, which gave access to the twin main axes of the military base zone on the plateau, H St led S to the bulk of the civil town and ultimately to the Palmyrene Gate, the steppe plateau W of the city, and the roads W to Palmyra and NW up the Euphrates to Syria. The fourth side of the crossroads followed a curving course SE, down into the inner wadi, then snaking through the irregularly laid-out old lower town to the now-lost River Gate, portal to the Euphrates and its plain. Of most immediate significance is that the Wadi Ascent Road also linked the plateau military zone with what can now be seen as another major area of military control, in the old Citadel, and on the adjacent wadi floor. The N part of the wadi floor is now known to have accommodated two military-built temples, the larger of which, the A1 ‘Temple of the Roman Archers’, was axial to the long wadi floor, which in the Roman period appears to have comprised one of the largest areas of open ground inside the city walls. This is interpreted as the campus, or military assembly and training ground, extension of which was commemorated in an inscription found in the temple. In 2011, what is virtually certainly a second military temple was found in the wadi close by the first, built against the foundation of the Citadel. This is here referred to as the Military Zeus Temple. Behind the Temple of the Roman Archers was a lane leading from the Wadi Ascent Road to the N gate of the Citadel. It helped define a further de facto enclosure, effectively surrounded by other military-controlled areas and so also presumed to have been in military hands. The Citadel itself, while in Roman times already ruinous on the river side due to cliff falls, still formed part of the defences. Moreover the massive shell of its Hellenistic walls now also appears to have been adapted to yet more military accommodation, some of it two storeys or higher.

Latin America encompasses a vast territory between 12°30'N and 55°30'S latitude and between 29°W and 82°W longitude. This subcontinent has 13 countries with complex climatic conditions. Extremely humid weather is typical closer to the equator, while semiarid, arid, and desertic conditions prevail in the Bolivian and Chilean high plains. The wide variation in climatic conditions leads to distinct agricultural conditions across Latin America. For example, forests, equatorial fruits, and perennial vegetation exist throughout the Amazonian region. Farther from the equator, toward the Andes and at higher latitudes, there is a noticeable change in agricultural systems. There is a greater emphasis on growing cereal/grain crops in Argentina and Brazil. The countries that compose the Amazon River basin experience a higher amount of annual precipitation, and drought is not a characteristic phenomenon there, except during high-intensity El Niño years (Marengo et al., 2001). In contrast, drought is a regular event commonly observed in parts of Peru, Chile, Paraguay, Argentina (Scian and Donnari, 1996), Uruguay, and Brazil. The Atacama Desert in Chile is one of the most arid regions on the earth, where the average annual precipitation is as low as 0.8 mm in Arika or even 0.5 mm in other regions of this desert. Figure 12.2 provides a more detailed description on climatic conditions of Brazil. Although the average annual precipitation in the northeastern region is less than 300 mm, it exceeds 2500 mm in some other regions of Brazil (Grimm, 2003). Agricultural operations take place during the rainy season (March–October). The northeast region is drought prone, but the central, west, and southeast regions are traditionally grain-producing regions. In the northeast and central-west regions, water deficiency is higher, which seriously affects food production. Table 12.1 shows production losses in Brazil due to climate anomalies including droughts that occurred during 1978–1986 (Mota, 1979) and 1991–1994 (Rossetti, 2001). About 33% (about 50% in the northeast region) of these losses were attributed to droughts. Maize production also significantly declined due to drought that occurred during 1990–91, 1993–94, 1996–97, and 1997–98.