Biodiversity in agriculture

Agricultural lands with large areas of monoculture lacking heterogeneity.

Biodiversity in agriculture is the measure of biodiversity found on agricultural land. Biodiversity is the total diversity of species present in an area at all levels of biological organization.[1] It is characterized by heterogeneous habitats that support the diverse ecological structure.[1] In agricultural areas, biodiversity decreases as varying landscapes are lost and native plants are replaced with cultivated crops.[1] Increasing biodiversity in agriculture can increase the sustainability of farms through the restoration of ecosystem services that aid in regulating agricultural lands.[2] Biodiversity in agriculture can be increased through the process of agroecological restoration, as farm biodiversity is an aspect of agroecology.

Biodiversity is the measure of biotic and abiotic diversity in an ecosystem, described by heterogeneity.[1] The loss of biodiversity in agriculture has been an increasing issue since the global increase of food demands and success of popular crops.[3][4] This loss of heterogeneity declines species biodiversity on agricultural lands.[5] Biodiversity in agriculture is essential in providing ecosystem services, which conserves biodiversity while providing agricultural services.[6]

Biodiversity loss

Agriculture creates a conflict over the use of land between wildlife and humans.[7] Land use for agriculture has been a driving force in creating biodiversity loss[8] An increase in the amount of pasture and crop land over the last few hundred years has led to the rapid loss of natural habitats.[7] The Food and Agriculture Organization of the United Nations estimates that more than 40% of Earth's land surface is currently used for agriculture. Because so much land has been converted to agriculture, habitat loss is recognized as the driving force in biodiversity loss.[9] A decline in farmland biodiversity can be traced to changes in farming practices and increased agricultural intensity.[3]: 182  Nonetheless, according to the FAO, "biodiversity is just as important on farms and in fields as it is in deep river valleys or mountain cloud forests".[10] In recent years, the world has acknowledged the value of biodiversity through treaties formed, such as in the 1992 Convention on Biological Diversity.[10]

Monoculture results in the loss of biodiversity, as it prioritizes cultivated crops over native plants.

The loss of habitat connectivity caused by fragmentation in agricultural areas threatens biodiversity, as it decreases population sizes and restricts its access to external resources.[11] Species facing habitat fragmentation can also create a genetic bottleneck[12] The decreased gene pool threatens species through factors such as inbreeding depression, where the less advantageous populations lowers the species survival rates.[11] Monoculture is the practice of producing a single crop on a given piece of land, including crop rotation.[12] While monoculture produces optimum yields, it has implications for the biodiversity of farms.[9] Heterogeneity, the diversity of the landscape, has been shown to be associated with species diversity. For example, butterfly abundance has been found to increase with heterogeneity. Land that is not cropped, such as fallow land, grass margins in the spaces between different fields, and strips of scrub along field boundaries increase heterogeneity and thus the biodiversity of a farm. Plants attract insects, which will attract certain species of birds, and those birds will attract their natural predators. The cover provided by non-cropped land allows species to move across the landscape.[3]: 183–184  In Asian rice, one study showed crop diversification by growing flowering crops in strips beside rice fields could reduce pests so that insecticide spraying was reduced by 70%, yields increase by 5%, together resulting in an economic advantage of 7.5%.[13]

The Green Revolution

One of the issues facing biodiversity in areas of industrial agriculture is the loss of heterogeneity, described by the loss of a biotic and abiotic diversity.[1][3] Since 1966, the Green Revolution enhanced agricultural productivity through technological, economical, and political advancements in an effort to increase food security globally.[14] This includes the introduction of genetically modified crops, which allows for increased yield, pest resistance, and improved crop varieties.[14] These advancements also led to increased global geographical spread of 52 agricultural crops with cereals such as wheat, rice, and maize showing the greatest increase in the past 50 years.[4] The loss of agricultural heterogeneity decreases local food security due to a loss in crop diversity, despite its accommodation of global food demands.[4]

Heterogeneity

Heterogeneity is essential in increasing species heterogeneity, which maintain stable ecological structures essential to providing ecosystem services.[5] Of the features associated with species diversity is land size, where a study proved a relationship between smaller agricultural fields and increased species richness.[15] The area of an agricultural field is associated with organisms accessibility to the edges of the field, which usually allow access for fields with different biophysical and geophysical features.[15] Increased accessibility to a diverse ecological features increases heterogeneity and reduces edge effects on populations inhabiting agricultural fields.[3][15][16]

Ecosystem services

Pollinators provide essential ecosystem services.

Agriculture is a transformative process to any habitat, with a main focus on cultivating crops for human consumption.[17] Views on ecosystem services can be presented through viewpoints that benefit humans environmentally, economically, and culturally to motivate the practices that support ecosystem services in the agricultural industry.[17] For example, low crop diversity can increase pests and their resistance to pesticides, resulting in large ecological disturbances and economical losses.[6] This can be mitigated with increased crop rotation, which contributes to more diverse soil microbiota and insects that provide ecosystem services.[6] Another example is the conservation of pollinators such as honeybees that can contribute to the agricultural industry, where contributing to the increase of pollinators is reciprocated with increased crop production.[17]

See also

References

  1. ^ a b c d e Harlan JR, Gepts P, Famula TR, Bettinger RL, Brush SB, Damania AB, McGuire PE, Qualset CO (2012-02-23). Biodiversity in Agriculture: Domestication, Evolution, and Sustainability. Cambridge University Press. p. 5. ISBN 978-0-521-76459-9.
  2. ^ Duru M, Therond O, Martin G, Martin-Clouaire R, Magne M, Justes E, et al. (October 2015). "How to implement biodiversity-based agriculture to enhance ecosystem services: a review". Agronomy for Sustainable Development. 35 (4): 1259–1281. Bibcode:2015AgSD...35.1259D. doi:10.1007/s13593-015-0306-1. ISSN 1773-0155. S2CID 256204561.
  3. ^ a b c d e Benton TG, Vickery JA, Wilson JD (April 2003). "Farmland biodiversity: is habitat heterogeneity the key?". Trends in Ecology & Evolution. 18 (4): 182–188. Bibcode:2003TEcoE..18..182B. doi:10.1016/S0169-5347(03)00011-9. ISSN 0169-5347.
  4. ^ a b c Khoury CK, Bjorkman AD, Dempewolf H, Ramirez-Villegas J, Guarino L, Jarvis A, et al. (March 2014). "Increasing homogeneity in global food supplies and the implications for food security". Proceedings of the National Academy of Sciences of the United States of America. 111 (11): 4001–4006. Bibcode:2014PNAS..111.4001K. doi:10.1073/pnas.1313490111. PMC 3964121. PMID 24591623.
  5. ^ a b Martin AE, Collins SJ, Crowe S, Girard J, Naujokaitis-Lewis I, Smith AC, et al. (February 2020). "Effects of farmland heterogeneity on biodiversity are similar to—or even larger than—the effects of farming practices". Agriculture, Ecosystems & Environment. 288: 106698. Bibcode:2020AgEE..28806698M. doi:10.1016/j.agee.2019.106698. ISSN 0167-8809. S2CID 209571087.
  6. ^ a b c Robertson GP, Gross KL, Hamilton SK, Landis DA, Schmidt TM, Snapp SS, Swinton SM (May 2014). "Farming for Ecosystem Services: An Ecological Approach to Production Agriculture". BioScience. 64 (5): 404–415. doi:10.1093/biosci/biu037. PMC 4776676. PMID 26955069.
  7. ^ a b Feber RE, Asteraki EJ, Firbank LG (2007). "Chapter 16: Can Farming and Wildlife Coexist?". In Macdonald DW, Service K (eds.). Key Topics in Conservation Biology. Oxford: Blackwell Publishing. ISBN 978-1-4051-2249-8.
  8. ^ Jackson DL, Jackson LL (2002). "Introduction". The Farm as Natural Habitat. Washington: Island Press. ISBN 978-1-59726-269-9.
  9. ^ a b Jackson LL (2002). "Chapter 10: Restoring Prairie Processes to Farmlands". In Jackson DL, Jackson LL (eds.). The Farm as Natural Habitat. Washington: Island Press. ISBN 978-1-59726-269-9.
  10. ^ a b "The future of agriculture depends on biodiversity". FAO Newsroom. Food and Agricultural Organization (FAO). 15 October 2004. Archived from the original on 17 January 2018. Retrieved 28 December 2018.
  11. ^ a b Banaszek A, Jadwiszczak KA, Ziomek J (November 2011). "Genetic variability and differentiation in the Polish common hamster (Cricetus cricetus L.): Genetic consequences of agricultural habitat fragmentation". Mammalian Biology. 76 (6): 665–671. Bibcode:2011MamBi..76..665B. doi:10.1016/j.mambio.2010.10.014. ISSN 1618-1476.
  12. ^ a b Geffen E, Luikart G, Waples RS (2007). "Chapter 4: Impacts of modern molecular genetic techniques on conservation biology". In Macdonald DW, Service K (eds.). Key Topics in Conservation Biology. Oxford: Blackwell Publishing. ISBN 978-1-4051-2249-8.
  13. ^ Gurr GM, Lu Z, Zheng X, Xu H, Zhu P, Chen G, et al. (February 2016). "Multi-country evidence that crop diversification promotes ecological intensification of agriculture". Nature Plants. 2 (3): 16014. Bibcode:2016NatPl...216014G. doi:10.1038/nplants.2016.14. PMID 27249349. S2CID 205458366.
  14. ^ a b Pingali PL (July 2012). "Green revolution: impacts, limits, and the path ahead". Proceedings of the National Academy of Sciences of the United States of America. 109 (31): 12302–12308. Bibcode:2012PNAS..10912302P. doi:10.1073/pnas.0912953109. PMC 3411969. PMID 22826253.
  15. ^ a b c Boulinier T, Nichols JD, Sauer JR, Hines JE, Pollock KH (April 1998). "Estimating species richness: the importance of heterogeneity in species detectability". Ecology. 79 (3): 1018–1028. doi:10.1890/0012-9658(1998)079[1018:ESRTIO]2.0.CO;2. ISSN 0012-9658.
  16. ^ Regenerative Farming Guide
  17. ^ a b c Swinton SM, Lupi F, Robertson GP, Hamilton SK (2007-12-15). "Ecosystem services and agriculture: Cultivating agricultural ecosystems for diverse benefits". Ecological Economics. Special Section - Ecosystem Services and Agriculture. 64 (2): 245–252. Bibcode:2007EcoEc..64..245S. doi:10.1016/j.ecolecon.2007.09.020. ISSN 0921-8009.

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