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Bagrada bug, Bagrada hilaris (Burmeister) (Hemiptera: Pentatomidae), is an invasive pest of cole crops in the United States. Because it also feeds on widespread weeds and persists in natural habitats surrounding crop fields, conventional control strategies are often ineffective at providing long-term control. One egg parasitoid, Gryon aetherium Talamas (Hymenoptera: Scelionidae), is a promising biological control candidate because of its ability to parasitise B. hilaris buried eggs. Recently, adventive populations of G. aetherium were recovered from sentinel eggs in California along with a native egg parasitoid, Ooencyrtus californicus Girault (Hymenoptera: Encyrtidae). A better understanding of these parasitoid species’ spatial preference for foraging and their possible competitive interactions will help evaluate their host suppression potential. We compared the foraging abilities of these two parasitoid species for eggs deposited below and above ground. We also investigated the effect of interspecific competition on host suppression and the ability of O. californicus to parasitise eggs previously parasitised by G. aetherium. G. aetherium parasitised naturally and manually buried eggs, whereas O. californicus did not. In another experiment, O. californicus parasitised eggs glued to cards, but not in the presence of sand. Results suggest that G. aetherium may be negatively affected by the presence of O. californicus, and there was a slight but significant reduction in total host mortality when the parasitoids were present together. However, the inability of O. californicus to forage in soil likely limits negative interactions between these two species, and the two parasitoids may ultimately complement each other.
Coastal wetlands are hotspots of carbon sequestration, and their conservation and restoration can help to mitigate climate change. However, there remains uncertainty on when and where coastal wetland restoration can most effectively act as natural climate solutions (NCS). Here, we synthesize current understanding to illustrate the requirements for coastal wetland restoration to benefit climate, and discuss potential paths forward that address key uncertainties impeding implementation. To be effective as NCS, coastal wetland restoration projects will accrue climate cooling benefits that would not occur without management action (additionality), will be implementable (feasibility) and will persist over management-relevant timeframes (permanence). Several issues add uncertainty to understanding if these minimum requirements are met. First, coastal wetlands serve as both a landscape source and sink of carbon for other habitats, increasing uncertainty in additionality. Second, coastal wetlands can potentially migrate outside of project footprints as they respond to sea-level rise, increasing uncertainty in permanence. To address these first two issues, a system-wide approach may be necessary, rather than basing cooling benefits only on changes that occur within project boundaries. Third, the need for NCS to function over management-relevant decadal timescales means methane responses may be necessary to include in coastal wetland restoration planning and monitoring. Finally, there is uncertainty on how much data are required to justify restoration action. We summarize the minimum data required to make a binary decision on whether there is a net cooling benefit from a management action, noting that these data are more readily available than the data required to quantify the magnitude of cooling benefits for carbon crediting purposes. By reducing uncertainty, coastal wetland restoration can be implemented at the scale required to significantly contribute to addressing the current climate crisis.
In this chapter, the subjection of the Israelites in Egypt and their later liberation from oppression is examined with extracts from the Hebrew Torah, and the Greek Septuagint. The vocabulary of servitude of both Hebrew and Greek is discussed through the account of Joseph’s service and disgrace in the house of Potiphar, followed by the suffering of the Israelites, the later descendants of Jacob. The oppression inflicted by the Egyptians and their pharaoh on the Israelites in Egypt is to be seen in their forced labour in making bricks and construction work. Liberation involved leaving the country together, under the leadership of Moses. A final section examines a few further literary texts dating from the Hellenistic and Roman periods that treat related Jewish subjects.
In this chapter tomb paintings join the selection of texts (preserved on stone, papyrus, and leather) to show the role of dependence as a structural feature of pharaonic society. Foreigners were acquired through raiding and warfare, and settled in both existing and new communities. An actual trade in persons is also documented and varying aspects of the experience of such individuals is examined, as they were exploited by those who purchased them or passed them on as gifts. Changes over time in the vocabulary of dependence are discussed, as are the different types of work and production in which such dependents were involved. Non-free dependents were employed on the land, in animal herding, and in artisanal workshops, especially textiles, as well as in the home. The key economic role of Egyptian temples is a constant feature of the period.
This chapter introduces the following corpus of texts from ancient Egypt, and outlines the differing meanings ascribed to slavery and dependence from antiquity to modern times. The terms used for dependents and slaves in the various languages of the texts translated here – Egyptian (Hieroglyphic, Hieratic, Demotic, and Coptic), Greek, and Arabic – are briefly presented, and defining features of the condition of those so labelled are discussed. How and from where such persons were acquired, their life experiences, and the different forms of exploitation in which they were involved are introduced, as are forms of slave resistance and limits to the archaeological and textual evidence available, and so to what we can learn from it.
Covering late antique Egypt into the period of Arab rule, this chapter introduces documents and literary texts translated from Greek, Coptic, and Arabic. In the countryside, coloni joined slaves and dependents at work on the great estates of Byzantine Egypt, while in the cities slavery continued as before. Coptic literature from the same period introduces servitude within Christian monasteries. The writings of Shenoute and Gnostic texts regularly employ the vocabulary of slavery in a negative sense. The trade, employment, and emancipation of slaves continued. Conscripted labour is also documented. Children and adults donated to monasteries represent a new form of sacred servitude. With the Arab conquest of Egypt, war and raiding resurface as important sources of slaves. Nubia and the Near East were again key areas for their acquisition, and slaves are illustrated as active in most areas of life and integrated into the religious life of their owners’ households.
In Roman Egypt, Greek remained the language of rule but the introduction of the Roman legal system and practices resulted in changes within the bureaucracy and an increase in documentation. Declarations were now required for birth, death, taxes, and much else. There were minor changes in the vocabulary of slavery, but in terms of acquisition and use much remained unchanged. There was an active market in slaves who were primarily employed in the home. There is further evidence for slaves in labouring jobs, artisanal roles, in entertainment and sex work. Imperial slaves held some important administrative roles, and slaves might act as business agents in urban settings. Slave labour was little used in agriculture, though the balance between free and unfree changed over time. As earlier, the boundaries between these categories were sometimes blurred. There is evidence, too, for the manumission of slaves. Documents translated in this chapter illustrate the situation.