The effect of freshwater sources on wintertime sea-ice CO2 processes was studied from the glacier front to the outer Tempelfjorden, Svalbard, in sea ice, glacier ice, brine and snow. March–April 2012 was mild, and the fjord was mainly covered with drift ice, in contrast to the observed thicker fast ice in the colder April 2013. This resulted in different physical and chemical properties of the sea ice and under-ice water. Data from stable oxygen isotopic ratios and salinity showed that the sea ice at the glacier front in April 2012 contained on average 54% of frozen-in glacial meltwater. This was five times higher than in April 2013, where the ice was frozen seawater. In April 2012, the largest excess of sea-ice total alkalinity (AT), carbonate ion ([CO32−]) and bicarbonate ion concentrations ([HCO3−]) relative to salinity was mainly related to dissolved dolomite and calcite incorporated during freezing of mineral-enriched glacial water. In April 2013, the excess of these variables was mainly due to ikaite dissolution as a result of sea-ice processes. Dolomite dissolution increased sea-ice AT twice as much as ikaite and calcite dissolution, implying different buffering capacity and potential for ocean CO2 uptake in a changing climate.

Knowledge of the parasite fauna of Australian freshwater fish is fragmentary and incomplete. An understanding of fish hosts and their associated parasites is vital for the successful management of aquatic ecosystems. In this study, we surveyed the parasite fauna of carp gudgeons (Hypseleotris spp.), a complex of species of Australian freshwater fishes, using morphology and molecular data for the 18S and 28S ribosomal RNA genes. We examined 137 individuals of three different taxa in the carp gudgeon species complex and found 16 parasitic taxa of the Digenea, Cestoda, Nematoda and Arthropoda (five adults and 11 larvae). Eleven parasites are reported for the first time from the carp gudgeons (Pseudodactylogyrus sp., Gyrodactylus sp., Clinostomum sp., Paradilepis patriciae, P. cf. kempi, two unidentified species of Paradilepis, Dendrouterina sp., Parvitaenia sp., two lineages of Cyclophyllidea gen. sp., Procamallanus sp., larvae of a spirurine nematode and Lernaea sp.), in addition to Apatemon cf. hypseleotris Negm-Eldin & Davies, 2001 and the invasive tapeworm Schyzocotyle acheilognathi (Yamaguti, 1934), which were previously reported from these fish hosts. Parasite species richness was double in Lake's and Midgley's carp gudgeons relative to western carp gudgeon. These findings highlight the key role of carp gudgeons as intermediate hosts for multiple parasites with complex life cycles using native birds as definitive hosts and the usefulness of DNA data for the identification of parasite larvae.

The adult and metacercaria life stages of a new species of the microphallid genus Atriophallophorus Deblock & Rosé, 1964 are described from specimens collected at Lake Alexandrina (South Island, New Zealand). In addition to molecular analyses of ribosomal and mitochondrial genes, metacercariae of Atriophallophorus winterbourni n. sp. from the snail host Potamopyrgus antipodarum (Gray) were grown in vitro to characterize internal and external morphology of adults using light and scanning electron microscopy and histological techniques. Atriophallophorus winterbourni n. sp. is readily distinguishable from Atriophallophorus coxiellae Smith, 1973 by having a different structure of the prostatic chamber, sub-circular and dorsal to genital atrium, rather than cylindrical, fibrous, elongate and placed between the seminal vesicle and the genital atrium. The new species is most similar to Atriophallophorus minutus (Price, 1934) with regards to the prostatic chamber and the morphometric data, but possesses elongate-oval testes and subtriangular ovary rather than oval and transversely oval in A. minutus. Phylogenetic analyses including sequence data for A. winterbourni n. sp. suggested a congeneric relationship of the new species to a hitherto undescribed metacercariae reported from Australia, both forming a strongly supported clade closely related to Microphallus and Levinseniella. In addition, we provide an amended diagnosis of Atriophallophorus to accommodate the new species and confirm the sinistral interruption of the outer rim of the ventral sucker caused by the protrusion of the dextral parietal atrial scale at the base of the phallus.

Parasite distribution among hosts is a fundamental aspect of host–parasite interactions. Aggregated parasite distributions within and across host species are commonly reported and potentially influenced by many factors, whether host or parasite specific, or related to host–parasite encounter and compatibility. Yet, the respective role of each in observed parasite distributions are often unclear. Here, we documented the distribution of the acanthocephalan parasite Pomphorhynchus laevis sensu lato (s.l.) in two replicate fish host populations. Aggregated distributions were observed in both populations, within and across fish host species. We found a positive abundance–prevalence relationship across fish species, suggesting that resource availability (fish host biomass density) was the main driver of P. laevis s.l. distribution. This was supported by further positive associations between mean parasite load and fish biomass density. We found little evidence for intensity-dependent regulation within host (i.e. intra-host competition among co-infecting parasites). Furthermore, P. laevis s.l. infection had no detectable effect on fish condition indices, except on the body condition of female barbel (Barbus barbus). Therefore, P. laevis s.l. tended to accumulate with size/age within fish species, and with fish biomass density among fish species, with apparently negligible limitations due to intra-host intensity-dependent regulation of parasite, or to parasite-induced morbidity in fish. The relative availability of final hosts for trophic transmission thus appears to be the main driver of P. laevis s.l. distribution among fish.

Ferroan and non-ferroan calcites occur in fractures in the Lower Carboniferous of the Variscan foreland of southern Belgium. These fractures post-date the Variscan orogeny and the calcites have a telogenetic origin. The non-ferroan calcites formed by recrystallization of the ferroan calcites. Two types of monophase aqueous fluid inclusions are present in the ferroan calcite cement. Although both types of inclusions formed at a temperature not exceeding 50°C, one type contains a moderately saline fluid (3.6–16.3 eq. wt.% NaCl) and the other type fresh water (Tm ice = 0°C). The fluid inclusions in the non-ferroan calcite also contain fresh water.

Detailed petrography of the fluid inclusions indicate that the fresh water migrated through the crystals along opened cleavage planes and microfractures. Therefore, they have a secondary origin. The recrystallization of the ferroan calcites to non-ferroan calcites occurred in this fresh water. The saline fluid inclusions are not related to the above mentioned microstructures and although their origin remains unknown, they could represent the ambient fluid from which the ferroan calcites precipitated. The study of the relationship between the occurrence of fluid inclusions and the microstructures seems promising for the identification of fluid inclusions representing post mineral formation fluid and temperature conditions in calcite cements.

Fresh water came from a variety of sources, streams and springs as well as aqueducts. Much of the Roman law on fresh water concerns its supply, regulating rights to use it with a variety of legal institutions from public and private law (e.g. ownership, servitudes, interdicts). The study of fresh water has usually followed the legal categories, segregating the public water supply from water that was private property, and consequently segregating different types of evidence. In this paper varied evidence is analysed using the ‘bundle’ approach, an analytical framework from legal scholarship on rights in the environment, in which water rights are not monolithic but are represented by component rights, including rights of access, withdrawal, management, exclusion and alienation. Analysing component rights in fresh water reveals significant continuities in the Romans' regulation of it and the impact of this regulation. Although there was no centralized water administration in the early Empire, Romans took a systematic approach to regulating fresh water based on consistent working principles and policy priorities.

Water in many different forms and contexts is of central significance in Southeast Asia, and these differences are reflected in the vast range of spirits and deities. Despite wide variation, the most obvious distinction is between spirits associated with fresh and salt water. Those linked to water associated with fertility are typically regarded as female and sympathetic to human requests for assistance. By contrast, the spirits who inhabit turbulent river waters and patrol the shorelines may be male, female, or only vaguely gendered. Although they can be capricious and sometimes cruel, they are nonetheless amenable to individual or communal supplication. The same ambiguity is exemplified by the sea spirits, who extend rewards to those they favour but inflict harsh punishments when their anger is aroused. Yet regardless of their nature or the place with which they were associated, the ‘power base’ of indigenous spirits was always locally concentrated. The limitations in their reach help explain the appeal of cosmologies that extended across a much larger area, and even across the entire globe. The accompanying conceptualization of new and benevolent beings is especially evident in the maritime environment. Here human activity is male-dominated, and the male divinities and saints associated with supra-local belief systems might appear to be the natural guardians of mariners. Even so, culturally entrenched ideas of connections between water and maternal care facilitated the adoption of female deities as protectors of ocean-going voyagers.

The Tonle Sap is the largest wetland in South-east Asia and the heart of the largest inland fishery in the world. Its unique flood pulse system and annual flow reversal is a hotspot for biodiversity and productivity, as well as an essential habitat for many endangered fishes and birds. Despite predicted changes to the wetland's hydrology due to climate change and hydropower development in the Mekong, the consequent impacts on the fauna of the lake are poorly understood. A spatial modelling framework was developed to simulate the impact of potential scenarios of change using relationships between fauna and biophysical characteristics. Potential impacts on 61 animal species with documented nutritional, conservation or ecological value were examined. A large number of species rely on gallery forest to provide important habitats for their life history, yet this area is likely to be highly impacted by permanent inundation. There is a strong synchronicity between life histories and the flood pulse; consequently continued hydrological disruptions will have a significant impact on ecosystem dynamics, imposing further challenges to conservation. Protecting areas that may become suitable for gallery forests and shrublands under a modified flood regime will be crucial to management planning and the maintenance of a diverse and healthy ecosystem.

Freshwater migratory shrimps, an important component of tropical aquatic ecosystems, are vulnerable to land-use change during their upstream and downstream migrations. At La Selva Biological Station in the Sarapiquí region of Costa Rica, shrimp population data were collected between 1988 and 1989, before massive land-use change occurred downstream that could potentially affect shrimp recruitment upstream. Using generalized linear models and a Bayesian inference framework, the relative abundance of Macrobrachium olfersi between recent (2008–2011) and historical time periods (1988–1989) was compared in three stream reaches. Shrimp relative abundance in two stream reaches within the protected area of La Selva was relatively constant yearly and between recent post-disturbance (2008–2011) and historical pre-disturbance (1988–89) time periods. In contrast, a stream reach bordered by pasture accessible to fishermen, showed an 87% decrease in relative abundance between recent and historical time periods suggesting site-level disturbance, possibly from fishing. The lack of change between historical and contemporary sampling periods within interior-forest stream reaches suggests that shrimp populations in protected forested reaches are resistant or resilient to certain land-use changes occurring downstream.

This essay argues that fresh water, its availability and use, should now be recognized as ‘a common concern of humankind’, much as climate change was recognized as a ‘common concern of humankind’ in the 1992 United Nations Framework Convention on Climate Change, and conservation of biodiversity was recognized as a ‘common concern of humankind’ in the 1992 Convention on Biological Diversity. This would respond to the many linkages between what happens in one area with the demand for and the supply of fresh water in other areas. It would take into account the scientific characteristics of the hydrological cycle, address the growing commodification of water in the form of transboundary water markets and virtual water transfers through food production and trade, and respect the efforts to identify a human right to water.

Des paramètres de la reproduction d'une population isolée du tilapia Sarotherodon melanotheron ont été étudiés durant 2 années consécutives et comparés avec les données de la littérature obtenues sur des populations vivant dans son milieu naturel. Le sexe-ratio (année 1 : 1:2,69; année 2 : 1:1,96) en faveur des femelles varie de façon saisonnière. Les mâles atteignent la maturitésexuelle plus rapidement (année 1 : 129 mm LS ; année 2 : 126 mm LS) queles femelles (année 1 : 135 mm ; année 2 : 136 mm LS). Le cycle dematuration des gonades est continu. Ces résultats sont dans l'ensemblesemblables à ceux obtenus dans le milieu naturel de l'espèce. Cependant,une fécondité inférieure et un diamètre ovocytaire plus grandsont notés dans le lac d'Ayamé. Le facteur de condition moyen despopulations du lac, intermédiaire entre des valeurs observées dans lesmilieux lagunaires, indique une bonne adaptation de l'espèce aux conditionsd'eau douce du lac.

La gestion de la reproduction du saumon atlantique nécessite généralement un transfert des géniteurs en eau douce avant la phase finale de la maturation sexuelle pour obtenir des gamètes de bonne qualité. Afin d'analyser l'impact de l'environnement marin, des géniteurs de saumon atlantique âgés de 2 ans (2+) ont été, soit maintenus en mer en cage (EM) jusqu'à la période de reproduction, soit transférés en eau douce (ED), en juin (EDP) ou en octobre (EDT). Les dates d'entrée en spermiation et d'ovulations ont été notées grâce à des observations hebdomadaires. La qualité des gamètes a été évaluée par le taux d'embryonnement au stade œillé après insémination de lots de 200 œufs par du sperme dilué à 10−3 avec du DIA 532®. Les femelles EDP et EDT ont ovulé entre novembre et décembre alors que les femelles EM présentaient un retard et un étalement des ovulations : 67 % des femelles EM avaient ovulé à la fin de l'expérience en avril. La fécondité relative des femelles EDP était significativement plus basse que celle des femelles maintenues en mer au moins jusqu'à l'automne. En dépit des cinétiques d'ovulation et des osmolantés des liquides coelomiques plus élevées, les œufs de femelles EM présentaient une qualité similaire à ceux des femelles ED lorsqu'ils sont utilisés moins d'une semaine après l'ovulation.

Les mâles ED et EM présentent des courbes similaires d'entrée en spermiation. Les spermes des mâles EM présentaient une qualité hétérogène et en moyenne médiocre. L'osmolarité des plasmas séminaux des mâles EM était significativement plus élevée (347 ± 13 mOsmol/l pour EM contre 265 ± 23 mOsmol/l pour ED). Les spermes EM de mauvaise qualité donnaient des résultats médiocres quelle que soit l'osmolarité des dilueurs d'insémination utilisés et comprises entre 150 et 450 mOsmol/l. De plus, aucune relation n'a été mise en évidence entre l'osmolarité individuelle des plasmas séminaux et la mauvaise qualité des spermes. D'un point de vue appliqué, l'osmolarité du plasma séminal ne peut être retenue comme critère qualitatif et le vieillissement des ovules après ovulation dans la cavité abdominale doit être strictement évité pour les femelles EM.