Foraminifera Abundance in the Southern Waters of Sumbawa, Senunu Canyon, West Sumbawa, Sumbawa, West Nusa Tenggara

Resti Samyati  Jatiningrum; Gina Mulhimatul  Aliyah; Anggun  Mutika; Yunia  Witasari

doi:10.22146/jtbb.15938

Resti Samyati Jatiningrum Geological Engineering Study Program, Faculty of Exploration and Production Technology, Universitas Pertamina, Jl. Teuku Nyak Arief, Jakarta 12220, Indonesia https://orcid.org/0000-0002-1599-412X
Gina Mulhimatul Aliyah Geological Engineering Study Program, Faculty of Exploration and Production Technology, Universitas Pertamina, Jl. Teuku Nyak Arief, Jakarta 12220, Indonesia
Anggun Mutika Geological Engineering Study Program, Faculty of Exploration and Production Technology, Universitas Pertamina, Jl. Teuku Nyak Arief, Jakarta 12220, Indonesia
Yunia Witasari Research Center for Limnology and Water resources, National Research and Innovation Agency of Indonesia (BRIN), Jl. Raya Jakarta-Bogor Km. 45, Bogor 16917, Indonesia https://orcid.org/0009-0009-1438-8513

DOI: https://doi.org/10.22146/jtbb.15938

Keywords: Distribution, Foraminifera, Southern Waters of Sumbawa

Abstract

The Southern Waters of Sumbawa, Senunu Canyon, West Nusa Tenggara, is influenced by the Indonesian Throughflow (ITF), crucial for regional marine dynamics. This area also faces impacts from mining tailings discharged into the seabed, raising concerns about their effects on meiobenthic fauna, including foraminifera. This study examined changes in foraminiferal assemblages, abundance, and diversity using 20 gravity core samples from sites NM.021 and NM.023. The results revealed a diverse and abundant presence of foraminifera, with planktonic foraminifera dominating in terms of abundance compared to benthic foraminifera, as indicated by an average P/B ratio exceeding 90 %. Twelve species of planktonic foraminifera and 17 species of benthic foraminifera were identified, with distinct compositions across the sites. At site NM.021, the most abundant benthic foraminifera were Bulimina sp. (23.5 %), Ceratobulimina pacifica (18.7 %), and Hoeglundina elegans (13.3 %), while dominant planktonic foraminiferal taxa consist of Hastigerina pelagica (21.6 %), Pulleniatina obliquiloculata (17.8 %), and Neogloboquadrina dutertrei (17.4 %). At site NM.023, the most abundant benthic foraminifera were Bolivinita quadrilateral (22.3 %) and Ceratobulimina pacifica (21.8 %), while the planktonic foraminiferal taxa showed similar dominance, with Pulleniatina obliquiloculata (20.8 %), Hastigerina pelagica (15 %), and Neogloboquadrina dutertrei (13.3 %) being the most abundant. The study highlights warm, eutrophic conditions with potential upwelling, indicated by planktonic species Pulleniatina obliquiloculata and Neogloboquadrina dutertrei. Additionally, these waters also have low oxygen levels (dysoxic), as evidenced by the presence of benthic species Bulimina sp. and Ceratobulimina pacifica.

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