Disturbance associated with bait-collection for sandprawns (Callianassa kraussi) and mudprawns (Upogebia africana): Long-term effects on the biota of intertidal sandflats

The sandprawn Callianassa kraussi and the mudprawn Upogebia africana are used extensively as fish bait in southern Africa. A holistic analysis of disturbance associated with experimental prawn-collecting was undertaken to determine its repercussions upon the sediment and associated macrofaunal, meiofaunal, microbial and microalgal communities. Patterns of recovery were examined for 18 months following the disturbance. The recovery of both C. kraussi and U. africana was far more protracted than predicted, taking 18 months for completion. Sedimentary compaction, associated with the removal of prawns, could account for these prolonged recoveries. Both C. kraussi and U. africana suffered greater depressions of population densities (ca. 70%) than would have been expected from the proportions removed (ca. 10% and 46% respectively). This suggests that disturbance and sedimentary compaction have greater effects than the removal of sand- and mudprawns per se. One month after the disturbance of C. kraussi, chlorophyll levels increased above control levels and remained elevated for a further 2–3 months. In contrast, the removal of U. africana resulted in nett decreases in chlorophyll levels for approximately one month following the disturbance. A short-lived decline in bacterial numbers was apparent following the removal of C. kraussi but not U. africana. Meiofaunal numbers declined immediately after disturbance of both C. kraussi and U. africana, but this depression was followed by explosive increases and then a return to control levels. The macrofauna was slower to recover and, after initial reductions of numbers, biomass and species richness, still showed signs of depression 18 months after the disturbance. Three response patterns were apparent: species which were immediately reduced by the treatments and were also slow to recover; species which appeared to have their recruitment suppressed relative to the control; and species which were unaffected by the treatment. Only a single macrofaunal species, the hermit crab Diogenes brevirostris, benefited from the disturbance. Similar trends were observed following the harvesting of both C. kraussi and U. africana

The ecological effects of collecting Callianassa kraussi Stebbing and Upogebia africana (Ortmann) for bait : impacts on the biota of an intertidal sandflat

Bibliography: leaves 122-142.The ecological effects of collecting the sandprawn Callianassa kraussi and the mudprawn Upogebia africana for bait were assessed at Langebaan Lagoon, South Africa, through surveys, observations and long-term experimental analyses. While only a small proportion of the prawns is removed from the lagoon annually, amounting to no more than 0.01 for the total lagoon, the physical disturbance inflicted by collecting is likely to be more detrimental and longer-lived than the actual removal of the prawns. Bait-collecting activities are concentrated on the centre sandbanks where some 400 000 prawns are removed annually - less than 5 of the total prawn population on these sandbanks. In terms of numbers removed, bait-collecting is thus no threat to the prawn populations at Langebaan Lagoon although there are signs that sandprawn densities and modal body sizes have been reduced in areas of intense bait-collecting activities. Massive quantities of sediment are disturbed through bait-collecting activities and this, inadvertently, results in the disturbance of other components of the biota. It is estimated that approximately 543 g of macrofauna are disturbed with each bag limit of prawns (50) removed, amounting to approximately 10 000 kg of macrofauna being disturbed annually. While the fate of this macrofauna is not completely determined, approximately 80 is subsequently preyed upon by scavenging gulls. The long-term effects of high-intensity disturbance on the biota of a sandflat were assessed through simulated bait-collecting activities, viz "digging" and "sucking" for C. kraussi and U. africana. The recovery of both C. kraussi and U. africana was far more protracted than predicted - probably being completed only 18 months after the initial disturbance. Meiofaunal and macrofaunal numbers decreased immediately following the initial disturbance

Land reform and biodiversity conservation in South Africa: Complementary or in conflict?

This paper aims to improve understanding of the conflicts that have arisen between land reform and conservation, and to encourage better comprehension between the land and conservation sectors. It does this by analysing current experiences in South Africa with regard to land reform in conservation areas, and, through the use of case studies, exploring synergies and tensions which currently exist between these two seemingly disparate objectives. The paper draws heavily on the experiences of those who have been actively involved in the debates, analyses and negotiations concerning land reform in protected areas. This has been done through literature review, an analysis of case studies, and interviews. A major source of information was workshops held by the Department of Land Affairs (DLA), the Department of Environmental Affairs and Tourism (DEAT), and IUCN (The World Conservation Union)-South Africa, to discuss the matter. The first workshop was held in November 1997 and brought together key people from the land and conservation sectors. Its outcome was to catalyse further workshops and the development of a research project on which earlier drafts of this paper were based. Two further workshops were held in July and August 1998 for the land and conservation sectors respectively, and the fourth in September 1998 for both the land and conservation sectors. Information relating to the #Khomani and Mkambati case studies is based on long-term field research within the claimant communities by two of the authors (Ellis and Kepe respectively)

Do smallholder farmer-led seed systems have the capacity to supply good-quality, fungal-free sorghum seed?

Local seed systems that are developed, managed and maintained by farmers are a fundamental practice in smallholder crop production, supporting more than 80% of farmers in sub-Saharan Africa and feeding more than 70% of its population. The resilience of such systems is under threat from poverty, climate change, drought, increased pests and diseases, over-promotion of modern crop varieties, change of lifestyles and restrictive seed policies. The system continues to be maligned as having inferior quality, yet few studies support this assertion. This study aims to fll this research gap by evaluating 60 sorghum seed samples collected from smallholder farmers in Uzumba-MarambaPfungwe and Chimanimani districts of Zimbabwe. We investigated the efect of farmer-led seed management practices (e.g. seed acquisition and seed storage practices) on farm-derived sorghum seed quality (moisture, germination and fungal incidences). We found farmers using diverse seed sources and seed storage practices. Seeds were typically of good quality in that their storage moisture content was low, their germination was high, and fungal incidences were low. Seed sourced from local markets, non-governmental organizations and other farmers had germination and moisture standards that met the sorghum certifcation standards in Zimbabwe. However, few samples obtained from the relatives and government failed to meet the germination and/or moisture certifcation standards. We detected low incidences of fungi (Aspergillus favus, Aspergillus niger, Curvularia lunata, Fusarium sp. and Penicillium sp.) in sorghum seed samples tested and in particular Fusarium sp., which is the most economic important fungus in sorghum production. We conclude that farmer-led seed systems have the capacity to supply seeds of good quality and recommend that such systems should be recognized and promoted to meet the ever-evolving needs of smallholder farmers in sub-Saharan Africa

Farmers’ Rights and Digital Sequence Information: Crisis or Opportunity to Reclaim Stewardship Over Agrobiodiversity?

Contestations about the way in which digital sequence information is used and regulated have created stumbling blocks across multiple international policy processes. Such schisms have profound implications for the way in which we manage and conceptualize agrobiodiversity and its benefits. This paper explores the relationship between farmers’ rights, as recognized in the International Treaty on Plant Genetic Resources for Food and Agriculture, and the dematerialization of genetic resources. Using concepts of “stewardship” and “ownership” we emphasize the need to move away from viewing agrobiodiversity as a commodity that can be owned, toward a strengthened, proactive and expansive stewardship approach that recognizes plant genetic resources for food and agriculture as a public good which should be governed as such. Through this lens we analyze the relationship between digital sequence information and different elements of farmers’ rights to compare and contrast implications for the governance of digital sequence information. Two possible parallel pathways are presented, the first envisaging an enhanced multilateral system that includes digital sequence information and which promotes and enhances the realization of farmers’ rights; and the second a more radical approach that folds together concepts of stewardship, farmers’ rights, and open source science. Farmers’ rights, we suggest, may well be the linchpin for finding fair and equitable solutions for digital sequence information beyond the bilateral and transactional approach that has come to characterize access and benefit sharing under the Convention on Biological Diversity. Existing policy uncertainties could be seized as an unexpected but serendipitous opportunity to chart an alternative and visionary pathway for the rights of farmers and other custodians of plant genetic resources.publishedVersio

New Pressures, Old Foodways: Governance and Access to Edible Mopane Caterpillars, Imbrasia (=Gonimbrasia) Belina, in the Context of Commercialization and Environmental Change in South Africa

Urbanization and scarce income-earning opportunities have led to increasing commercialization of non-timber forest products in southern Africa, including the nutritious mopane worm Imbrasia (=Gonimbrasia) belina. The mopane worm contributes substantially to incomes and food security in households across the region, but little research has addressed its use within South Africa. Using semi-structured interviews with harvesters and resource managers, this paper compares the management of mopane worm resources under public, private, and communal governance systems to explore the ability of each to provide users with sustainable access to the resource. Results show that governance is weaker in the communal property regime compared to the public and private property regimes. Weak control over access and high demand for mopane worms in urban and rural centres may be leading to a concentration of harvesting pressures in communally managed areas, increasing competition for a resource already scarce after years of drought and land-use change

Exploring local perceptions around the value of marine biodiversity: the case of kelp in the Western Cape, South Africa

Kelp are large seaweeds that provide a variety of contributions to humans and the environment. In South Africa, kelp forests are expanding as a consequence of climate change. Considering this expansion, assessing local perceptions and values around kelp’s contributions may assist with the implementation of inclusive management strategies. The lack of consideration of non-market and non-use values is a gap in kelp valuation studies, with kelp ecosystems and their use rarely valued outside of classical economic valuation frameworks. This study sought to fill this research gap, intending to assess local perceptions about varied value dimensions associated with kelp using a pluralistic valuation approach. Drawing from a sample population of Recreational Users and/or Coastal Community Members, Environmental Managers and Conservationists, and Kelp and/or Abalone Industry, the study investigated perceptions of value towards kelp in the Western Cape region of South Africa. Results indicate that the perceived value of kelp extends far beyond its economic value as a harvested resource. Rather, individuals highly value kelp’s ecological and social contributions, and have strong relational values towards kelp, recognizing its role in enhancing their quality of life and well-being. While most individuals did not display significant negative perceptions around kelp, some individuals in the Kelp and/or Abalone Industry indicated frustrations with kelp management strategies and kelp concession permit allocation processes. These findings highlight the need to incorporate local perceptions in integrated marine resource management solutions that recognize the plurality of values not only around kelp in the Western Cape but marine biodiversity at large.FUNDING : The BlueConnect project “Blue growth opportunities in changing kelp forests” [SANOCEAN Project Number 287191] and the NRF Global Change Grand Challenge [ESS180920360856] are acknowledged for providing funding to support the research. This work also forms part of the Bioeconomy Research Chair supported by the Department of Science and Innovation and National Research Foundation of South Africa [Grant Number 84429]. Any opinion, finding and conclusion or recommendation expressed in this material is that of the authors and the NRF does not accept any liability in this regard.https://www.tandfonline.com/journals/TBSMam2024Gordon Institute of Business Science (GIBS)SDG-14:Life below wate

A tiered approach to the marine genetic resource governance framework under the proposed UNCLOS agreement for biodiversity beyond national jurisdiction (BBNJ)

Credit for icons Icons from ‘The Noun Prjoect’: Bell by Vectors Point, Carrot vege- tables by CHARIE Tristan, Computer by ArmOkay, Shake hand by Wing, Drug by adindar, Coral by Nook Fulloption, Label by AB Designs. Declaration of competing interest The ideas and content from this article formed the basis of the In- ternational Council of Environmental Law’s Information Paper of March 25, 2019 and August 30, 2019 that were written by the first two authors and distributed publicly to delegates for the third negotiating session of the proposed UNCLOS implementing agreement on the conservation and sustainable use of marine biodiversity in areas beyond national juris- diction. The Tiered Approach concept was also presented to the ‘One Ocean’ Symposium on August 24, 2019 in New York for feedback from delegates. Marcel Jaspars is founder of, shareholder of, and consultant for ‘GyreOx Ltd’ which uses marine and terrestrial enzymes for the rapid production of complex molecules to target protein-protein interactions involved in disease. CRediT authorship contribution statement Fran Humphries: Conceptualization, Writing - original draft, Writing - review & editing. Hiroko Muraki Gottlieb: Conceptualiza- tion, Writing - review & editing. Sarah Laird: Conceptualization, Writing - review & editing. Rachel Wynberg: Conceptualization, Writing - review & editing. Charles Lawson: Conceptualization, Writing - review & editing. Michelle Rourke: Conceptualization, Writing - review & editing. Morten Walløe Tvedt: Writing - review & editing. Maria Julia Oliva: Writing - review & editing. Marcel Jaspars: Conceptualization, Writing - review & editing.Peer reviewedPublisher PD