Recommendation
This article “Sorghum and finger millet cultivation during the Aksumite period: insights from ethnoarchaeological modelling and microbotanical analysis”, submitted by Ruiz-Giralt and colleagues (2023a), presents an innovative attempt to address the lack of palaeobotanical data concerning ancient agricultural strategies in the northern Horn of Africa. In lieu of well-preserved macrobotanical remains, an especial problem for C4 crop species, these authors leverage microbotanical remains (phytoliths), in combination with ethnoarchaeologically-informed agroecology models to investigate finger millet and sorghum cultivation during the period of the Aksumite Kingdom (c. 50 BCE – 800 CE).
Both finger millet and sorghum have played important roles in the subsistence of the Horn region, and throughout much of the rest of Africa and the world in the past. The importance of these drought-resistant and adaptable crops is likely to increase as we move into a warmer, drier world. Yet their histories of cultivation are still only approximately sketched due to a paucity of well-preserved remains from archaeological sites - for example, debate continues as to the precise centre of their domestication. Recent studies of phytoliths (by these and other authors) are demonstrating the likely continuous presence of these crops from the pre-Aksumite period. However, phytoliths are diagnostic only to broad taxonomic levels, and cannot be used to securely identify species. To supplement these observations, Ruiz-Giralt et al. deploy models (previously developed by this team: Ruiz-Giralt et al., 2023b) that incorporate environmental variables and ethnographic data on traditional agrosystems. They evaluate the feasibility of different agricultural regimes around the locations of numerous archaeological sites distributed across the highlands of northern Ethiopia and southern Eritrea.
Their results indicate the general viability of finger millet and sorghum cultivation around archaeological settlements in the past, with various regions displaying greater-or-lesser suitability at different distances from the site itself. The models also highlight the likelihood of farmers utilising extensive-rainfed regimes, given low water and soil nutrient requirements for these crops. The authors discuss the results with respect to data on phytolith assemblages, particularly at the site of Ona Adi. They conclude that Aksumite agriculture very likely included the cultivation of finger millet and sorghum, as part of a broader system of rainfed cereal cultivation.
Ruiz-Giralt et al. argue, and have demonstrated, that ethnoarchaeologically-informed models can be used to generate hypotheses to be evaluated against archaeological data. The integration of many diverse lines of information in this paper certainly enriches the discussion of agricultural possibilities in the past, and the use of a modelling framework helps to formalise the available hypotheses. However, they emphasise that modelling approaches cannot be pursued in lieu of rigorous archaeobotanical studies but only in tandem - a greater commitment to archaeobotanical sampling is required in the region if we are to fully detail the histories of these important crops.
References
Ruiz-Giralt, A., Beldados, A., Biagetti, S., D’Agostini, F., D’Andrea, A. C., Meresa, Y. and Lancelotti, C. (2023a). Sorghum and finger millet cultivation during the Aksumite period: insights from ethnoarchaeological modelling and microbotanical analysis. Zenodo, 7859673, ver. 3 peer-reviewed and recommended by Peer Community in Archaeology. https://doi.org/10.5281/zenodo.7859673
Ruiz-Giralt, A., Biagetti, S., Madella, M. and Lancelotti, C. (2023b). Small-scale farming in drylands: New models for resilient practices of millet and sorghum cultivation. PLoS ONE 18, e0268120. https://doi.org/10.1371/journal.pone.0268120
DOI or URL of the preprint: https://doi.org/10.5281/zenodo.7859674
Version of the preprint: 1
Dear Abel,
As you will see, you have received two positive reviews of your submission. Both authors have requested minor changes, including the addition of a broader scale map (perhaps as an inset) and providing definitions of some of your terms. Both reviewers have also highlighted the referencing.
I consider your submssion accepted, pending these minor corrections, which will not require that the manuscript is returned to the reviewers for their approval - let me know if you think you cannot accommodate these changes.
Thank you, and best wishes,
Emma
Summary of work and overall impressions
This article highlights the problems archaeologists face when trying to trace the origins and spread of agriculture. It gives a clear and concise overview of the Aksumite period and gives valuable information about the subsistence strategies used by Aksumite communities. It also gives information on the environmental changes that occurred prior to and during the sites’ occupation.
This article explores the use of models which can accurately predict the areas and extent of finger millet and sorghum cultivation at Aksumite sites in the horn of Africa. These models were developed using data from various sources, for example ethnographic fieldwork and literature on modern day farming practices, as well as published GIS environmental data. The authors show the accuracy of the models used for the study and shares new information on factors that influence where crops were cultivated. Phytolith analysis is used to give information about which crops may have been cultivated, as well as give information about whether or not irrigation was used by Aksumite communities.
Overall I find this article to be well written, with simplistic language that makes it easy to read and understand. The goals of the article are clear. The authors are well informed on current literature and methods, and the data is well presented and discussed.
Comments:
These items need attention:
I read Ruiz-Giralt et al.’s work with much pleasure. It is a well-written and comprehensive paper,
also respectful of the work already done in this area of extraordinary environmental interest.
According to an original methodology, the authors have skillfully declined cross-cultural modelling,
ethnoarchaeology and phytolith analysis to propose and test hypotheses about past agricultural
practices, mainly focused on finger millet and sorghum agriculture, in the northern Horn of Africa
region during the Aksumite Kingdom.
They produce an excellent paper highly relevant to Aksumite archaeology that will be much cited in
the future. The text is well written, the methodology is well presented, and the results are of great
interest, also given the poor environmental data available for this region and chronology that luckily
are expanding considerably in recent years.
The structure of the paper (Introduction, Study area, Study case, Materials and methods, Results,
Discussion, and Concluding remarks) is formally correct. The figures and tables are correct, as well
as the Supplementary materials.
I suggest revising the list of references and some inline references. The following inline references
are missing in the reference list at the end of the paper:
- line 77: Lucarini et al. 2016
- line 154: D’Andrea et al. 2008
- line 171: Breton 2018;
- lines 172-173: Schmidt et al. 2008b
- line 281: Harrower et al. 2019
- González-Rabanal et al. 2022
The following papers are listed in the reference list at the end but their inline references are missing:
- Cantor, S.B., Sun, C.C., Tortolero-Luna, G., Richards-Kortum, R., Follen, M., 1999. A
Comparison of C/B Ratios from Studies Using Receiver Operating Characteristic Curve
Analysis. Journal of Clinical Epidemiology 52, 885–892. https://doi.org/10.1016/S0895-
4356(99)00075-X
- Fick, S.E., Hijmans, R.J., 2017. WorldClim 2: new 1-km spatial resolution climate surfaces for
global land areas. Int. J. Climatol 37, 4302–4315. https://doi.org/10.1002/joc.5086
- Lancelotti, C., Biagetti, S., Zerboni, A., Usai, D., Madella, M., 2019. The archaeology and
ethnoarchaeology of rain-fed cultivation in arid and hyper-arid North Africa. Antiquity 93,
1026–1039. https://doi.org/10.15184/aqy.2019.109
- Manel, S., Williams, H.C., Ormerod, S.J., 2001. Evaluating presence-absence models in
ecology: the need to account for prevalence: Presence-absence modelling. Journal of Applied
Ecology 38, 921–931. https://doi.org/10.1046/j.1365-2664.2001.00647.x
- Oliver, J.E., 1980. Monthly Precipitation Distribution: A Comparative Index. The Professional
Geographer 32, 300–309. https://doi.org/10.1111/j.0033-0124.1980.00300.x
- Shangguan, W., Dai, Y., Duan, Q., Liu, B., Yuan, H., 2014. A global soil data set for earth
system modeling. Journal of Advances in Modeling Earth Systems 6, 249–263.
https://doi.org/10.1002/2013MS000293
If the cited papers have to be listed in alphabetical order and from the more recent to the older in the
reference list at the end, as it seems to me, you should move:
- Schimdt, P.R., Curtis, M.C., Teka, Z., 2008. The Archaeology of Ancient Eritrea. The Red Sea
Press, Asmara.
after
- Schmidt, P.R., 2009. Variability in Eritrea and the Archaeology of the Northern Horn During
the First Millennium BC: Subsistence, Ritual, and Gold Production. Afr Archaeol Rev 26, 305–
325. https://doi.org/10.1007/s10437-009-9061-5
Some typos are present:
- Line 52: (Vavilov 1925) is “Vavilov, N.I., 1926. Studies on the origin of cultivated plants.
Bulletin of Applied Botany and Plant Breeding, Leningrad.” in the reference list;
- Line 56: (Winchell et al. 2018) is Winchell, F., Stevens, C.J., Murphy, C., Champion, L., Fuller,
DorianQ., 2017. in the reference list;
- Line 120: (Hagos et al. 2019) is “Hagos, H., Abrha, H., Hadgu, M., 2021. Agroclimatic
zonation of Tigray region of Ethiopia based on aridity index and traditional agro-climatic zones.
J. Agrometeorol. 21, 176–181. https://doi.org/10.54386/jam.v21i2.229”, in the reference list
- (R Core Team 2022) is “R Core Team, 2021. R: A Language and Environment for Statistical
Computing. R Foundation for Statistical Computing, Vienna, Austria”. in the reference list.
- Line 132 Tierney and de Menocal in 2013. Erase “in”
- Line 195: According to Sulas (2009, 2014). Is the first (et al. 2009)?
- Vavilov, N.I., 1951. The Origin, Variation, Immunity and Breeding of Cultivated Plants.
Chronica Botanica 13, 1–366. https://doi.org/10.2134/agronj1952.00021962004400020016x
I think you can erase the doi, it links to a review of the work of Vavilov.
Please revise these. Some other useful references should be added:
- D’Andrea et al. 2011, Stable isotopic analysis of human and animal diets from two pre-
Aksumite/Proto-Aksumite archaeological sites in northern Ethiopia. Journal of Archaeological
Science 38 (2011) 367e374.
- Delle Donne 2021, Cereal ears on Aksumite coins: Reflections between numismatics and
archaeobotany. Rassegna di Studi Etiopici, 3° serie, 5 (LII): 269-311.
In my opinion this paper can be published, provided the author solves the formal problems in the
inline references and the References at the end.