The status of seagrass beds in the coastal county of Lamu, Kenya
Keywords:
seagrass density, fish density, marine spatial planningAbstract
Biodiversity assessments within seagrass beds were conducted in six sites in Lamu, Kenya; namely, Kiweni, Tauzi, Wange, Ntopate, Manda toto and Ngoi. The objective of the assessment was to collect baseline information of the seagrasses of Lamu County in Kenya. Our findings revealed that nine out of the twelve seagrass species found in Kenya were found in the study sites. The dominant seagrass species Thalassodendron ciliatum was found to occur in deeper subtidal areas, while the pioneering species occurred in intertidal shallower areas. Average shoot densities per site ranged from 2.4 ± 1.7 shoots m-2 of Cymodocea serrulata to 1025.9 ± 139.3 shoots m-2 of Syringodium isoetifolium in Ngoi. Canopy heights ranged from 0.1 ± 0.1 cm of Halodule ovalis in Tauzi to 16.3±1.3.5 cm of Syringodium isoetifolium in Ngoi. Although the seagrass species characteristics were much lower than that found in similar mangrove fringed seagrass beds of Gazi Bay, the majority of the fish found in these seagrass areas were invertivores which indicates that these seagrass sites form a refugia for adult fish populations with nursery grounds being located elsewhere.
This study forms the first comprehensive assessment of the seagrasses of Lamu and it provides important baseline information on seagrass beds. Such biodiversity information provides important support for decision-making for coastal areas that are targeted for infrastructural development such as Lamu. Biodiversity information of such critical habitats form a critical data base for marine spatial planning and can be used to effectively guide the integration of biodiversity and coastal livelihoods in the sustainable development of Kenya’s coastal areas.
References
CostanzaRobert, d'ArgeRalph, GrootRudolf de, FarberStephen, GrassoMonica, HannonBruce, LimburgKarin, NaeemShahid, O'NeillRobert V., ParueloJose, RaskinRobert G., SuttonPaul, BeltMarjan van den. The value of the world's ecosystem services and natural capital. Nature. 1997. 387, 6630: 253-260. 0028-0836, 1476-4687. 10.1038/387253a0. Springer Science and Business Media LLC. https://dx.doi.org/10.1038/387253a0.
OrthRobert J., CarruthersTim J. B., DennisonWilliam C., DuarteCarlos M., FourqureanJames W., HeckKenneth L., HughesA. Randall, KendrickGart A., KenworthyW. Judson, OlyarnikSuzanne, ShortFrederick T., WaycottMichelle, WilliamsSusan L. A Global Crisis for Seagrass Ecosystems. BioScience. 2006. 56, 12: 987-987. 0006-3568. 10.1641/0006-3568(2006)56[987:agcfse]2.0.co;2. Oxford University Press (OUP). https://dx.doi.org/10.1641/0006-3568(2006)56[987:agcfse]2.0.co;2.
HemmingaM. A., DuarteC. M. Seagrass Ecology. Cambridge University Press, Cambridge. 2000.
ShortF., CarruthersT., DennisonW., WaycottM. Global seagrass distribution and diversity: A bioregional model. Journal of Experimental Marine Biology and Ecology. 2007. 350, 1-2: 3-20. 0022-0981. 10.1016/j.jembe.2007.06.012. Elsevier BV. https://dx.doi.org/10.1016/j.jembe.2007.06.012.
OchiengC. A., ErftemeijerP. L. A., GreenE. P., ShortF. T. The seagrasses of Kenya and Tanzania. World atlas of seagrasses. University of California Press, Berkeley. 2003.
HughesA. Randall, StachowiczJohn J., WilliamsSusan L. Morphological and physiological variation among seagrass (Zostera marina) genotypes. Oecologia. 2009. 159, 4: 725-733. 0029-8549, 1432-1939. 10.1007/s00442-008-1251-3. Springer Science and Business Media LLC. https://dx.doi.org/10.1007/s00442-008-1251-3.
TrochM. De, FiersF., VincxM. Alpha and beta diversity of harpacticoid copepods in a tropical seagrass bed: the relation between diversity and species' range size distribution. Marine Ecology Progress Series. 2001. 215, 225-236. 0171-8630, 1616-1599. 10.3354/meps215225. Inter-Research Science Center. https://dx.doi.org/10.3354/meps215225.
NybakkenJ. W. Marine Biology: An Ecological Approach. Benjamin Cummings, San Francisco. 2001.
AdamP., KingR. J., ClaytonM.N., KingR. J. Ecology of unconsolidated shores. Biology of Marine Plants. Longman Australia Pty Limited, Melbourne. 1995. 296-309.
PantusaD., D’alessandroF., RiefoloL., PrincipatoF., TomasicchioG. R. Application of a Coastal Vulnerability Index. A Case Study along the Apulian Coastline, Italy. Water. 2018. 10. doi:10.3390/ w10091218.
EklöfJ.S., de la Torre-CastroM., GullströmM., UkuJ., MuthigaN., LyimoT., BandeiraS.O. Sea urchin overgrazing of seagrasses: A review of current knowledge on causes, consequences, and management. Estuarine, Coastal and Shelf Science. 2008. 79, 4: 569-580. 0272-7714. 10.1016/j.ecss.2008.05.005. Elsevier BV. https://dx.doi.org/10.1016/j.ecss.2008.05.005.
ShortF. T., ColesR. Global Seagrass Research Methods. Elsevier Publishing, The Netherlands. 2001. 0444508910.
WaycottM., McmahonM., MellorsJ., CalladineA., KleineD. A guide to the tropical seagrasses of the Indo-West Pacific. James Cook University, Townsville. 2004.
OliveiraE. C., Österlundk., MtoleraM. S. P. Marine plants of Tanzania : A field guide to the seaweeds and seagrasses of Kenya and Tanzania. Stockholm University, Stockholm. 2003.
EnglishS., WilkinsonC., BakerV. Survey manual for tropical marine resources, 2nd edition. Australian Institute of Marine Science, Townsville. 1997.
GithaigaMichael N., KairoJames G., GilpinLinda, HuxhamMark. Carbon storage in the seagrass meadows of Gazi Bay, Kenya. PLOS ONE. 2017. 12, 5: e0177001-e0177001. 1932-6203. 10.1371/journal.pone.0177001. Public Library of Science (PLoS). https://dx.doi.org/10.1371/journal.pone.0177001.
KaramaK., MatshushitaY., KimaniE., OkemwaG., MwakitiS., AuraC., NdegwaS. Codend mesh size of beach seine net influences fish species and size composition in Lamu, north coast. WIO Journal of Marine Science. 2017. 16, 2: 79-88.
IguluMathias M., NagelkerkenIvan, DorenboschMartijn, GrolMonique G. G., HarborneAlastair R., KimireiIsmael A., MumbyPeter J., OldsAndrew D., MgayaYunus D. Mangrove Habitat Use by Juvenile Reef Fish: Meta-Analysis Reveals that Tidal Regime Matters More than Biogeographic Region. PLoS ONE. 2014. 9, 12: e114715-e114715. 1932-6203. 10.1371/journal.pone.0114715. Public Library of Science (PLoS). https://dx.doi.org/10.1371/journal.pone.0114715.
MangiS. C., RobertsC. M. Quantifying the environmental impacts of artisanal fishing gear on Kenya’s coral reef ecosystems. Marine Pollution Bulletin. 2006. 52, 12: 1646-1660. 0025-326X. 10.1016/j.marpolbul.2006.06.006. Elsevier BV. https://dx.doi.org/10.1016/j.marpolbul.2006.06.006.
Torre-CastroMaricela de la, CarloGiuseppe Di, JiddawiNarriman S. Seagrass importance for a small-scale fishery in the tropics: The need for seascape management. Marine Pollution Bulletin. 2014. 83, 2: 398-407. 0025-326X. 10.1016/j.marpolbul.2014.03.034. Elsevier BV. https://dx.doi.org/10.1016/j.marpolbul.2014.03.034.
BjörkM., ShortF., McleodE., BeerS. Managing seagrasses resilience to climate change. IUCN, Gland, Switzerland. 2008.
HamerlynckO., NyunjaJ., LukeQ., NyingiD., LebrunD., DuvailS. Sustainable use of biological diversity in socio-ecological production landscapes. Background to the ‘Satoyama Initiative for the benefit of biodiversity and human well-being. ’ Secretariat of the Convention on Biological Diversity, Montreal. Technical Series. 2010. 52: 54-62.
Okafor-YarwoodIfesinachi, KadagiNelly I., MirandaNelson A. F., UkuJacqueline, ElegbedeIsa O., AdewumiIbukun J. The Blue Economy–Cultural Livelihood–Ecosystem Conservation Triangle: The African Experience. Frontiers in Marine Science. 2020. 7, 586-586. 2296-7745. 10.3389/fmars.2020.00586. Frontiers Media SA. https://dx.doi.org/10.3389/fmars.2020.00586.
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