The spatial distribution and seasonal succession of planktonic foraminifera in the California Current off Oregon, September 1987 – September 1988

Abstract Spines and rhizopodia play an important role in the feeding behavior, symbiont ecology, shell geochemistry, and density and drag of planktonic foraminifera. However, there are few empirical data on planktonic foraminifera in situ, and these delicate structures are disturbed on capture. Here, we report spine and rhizopod measurements from underwater images obtained in the California Current System near La Jolla, California by Zooglider, a new autonomous zooplankton-sensing glider. Across all observed species, we find that spine length and flexibility correlate with test size and that spines increase the effective prey encounter volume of spinose foraminifera by two to three orders of magnitude. Our data also yielded several novel observations regarding hastigerinid foraminifera (Hastigerinella digitata and Hastigerina pelagica), a group of unusually large planktonic foraminifera that are abundant in our dataset below 250 m. First, the effective encounter volume of hastigerinid foraminifera can be very large: our largest specimen occupies almost 40 cm3 (about the size of a golf ball), while the median specimen occupies 5.3 cm3 (about the size of a cherry). Second, the majority of hastigerinid foraminifera in our dataset have asymmetric bubble capsules, which are most frequently oriented with their bubbles on the upward side of the test, consistent with the hypothesis that the bubble capsule is positively buoyant. Third, 16% of hastigerinid foraminifera in our dataset have dispersed bubble capsules with detached bubbles distributed along the spines and rhizopodia, consistent with a regular source of natural disturbance. Taken together, our observations suggest that hastigerinid foraminifera play a larger role as mesopelagic predators in the California Current System than previously recognized.

Download Full-text

Faculty Opinions recommendation of Planktonic foraminifera of the California Current reflect 20th-century warming.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1030244.357507 ◽

2006 ◽

Author(s):

John Marra

Keyword(s):

20Th Century ◽

Planktonic Foraminifera ◽

California Current

Download Full-text

Spatial distribution and controlling factors of planktonic foraminifera in the modern western Pacific

Quaternary International ◽

10.1016/j.quaint.2018.01.003 ◽

2018 ◽

Vol 468 ◽

pp. 14-23 ◽

Cited By ~ 3

Author(s):

Baizheng An ◽

Tiegang Li ◽

Jian Liu ◽

Hanjie Sun ◽

Fengming Chang

Keyword(s):

Spatial Distribution ◽

Planktonic Foraminifera ◽

Controlling Factors ◽

Western Pacific

Download Full-text

Seasonal succession and spatial–temporal distribution patterns of six larval cytospecies of the Simulium venustum/verecundum complex (Diptera: Simuliidae)

Canadian Journal of Zoology ◽

10.1139/z93-017 ◽

1993 ◽

Vol 71 (1) ◽

pp. 116-124 ◽

Cited By ~ 10

Author(s):

John W. McCreadie ◽

Murray H. Colbo

Keyword(s):

Spatial Distribution ◽

Second Generation ◽

Seasonal Succession ◽

Temporal Distribution ◽

Distribution Patterns ◽

Seasonal Occurrence ◽

Generation Number ◽

Avalon Peninsula ◽

Ecological Profiles

The seasonal succession of S. venustum/verecundum cytospecies found in both sublacustrine and downstream habitats on the Avalon Peninsula, Newfoundland, was investigated. EFG/C venustum (= Simulium truncatum Lundström) appeared 1–5 weeks earlier than other cytospecies. ACD verecundum (= S. rostratum Lundström) and AA verecundum usually appeared later and remained in streams longer than EFG/C, AC(gb) venustum, CC2 venustum, or CC3 venustum. Seasonal occurrence of sympatric cytospecies often overlapped, though development was typically staggered and population peaks were asynchronous. EFG/C, and probably CC3, are univoltine in Newfoundland. AC(gb) may have a second generation at a few sites. CC2 has two or more generations per year in Newfoundland, though generation number varied among sites. ACD and AA are multivoltine. Proportionally more ACD and AA were found on vegetation than on rocks, whereas the reverse was true for EFG/C. As well, the density of a mixed ACD–AA population was usually higher on vegetation than on rocks. Cytospecies composition at sublacustrine sites was different from sites farther downstream. The results of the present investigation were also combined with those of a previous study on spatial distribution to construct spatial–temporal ecological profiles for four cytospecies (EFG/C, AC(gb), ACD, AA). Each cytospecies showed a distinct profile.

Download Full-text

DISTRIBUSI SPASIAL FORAMINIFERA DI PERAIRAN TELUK CENDERAWASIH, PAPUA BARAT

JURNAL GEOLOGI KELAUTAN ◽

10.32693/jgk.17.2.2019.602 ◽

2020 ◽

Vol 17 (2) ◽

Author(s):

Eko Saputro ◽

Lili Fauzielly ◽

Imelda Rosalina Silalahi ◽

Winatris Winatris

Keyword(s):

Spatial Distribution ◽

Community Structure ◽

Marine Sediments ◽

Marine Sediment ◽

Benthic Foraminifera ◽

Planktonic Foraminifera ◽

Sediment Samples ◽

Enclosed Bay ◽

Papua Barat ◽

Good Environment

Sebanyak 20 sampel sedimen dari perairan Teluk Cenderawasih telah digunakan sebagai bahan studi foraminifera, yang bertujuan untuk mengetahui bagaimana sebaran spasial dan struktur komunitas foraminifera di perairan Teluk Cenderawasih. Hasil penelitian menunjukkan komposisi foraminifera planktonik yang terdiri dari 7 Genus dan 13 Spesies sedangkan foraminifera bentonik terdiri dari 57 Genus dan 87 Spesies. Foraminifera planktonik yang paling umum ditemukan karena muncul di seluruh sampel adalah genus Globigerinoides, terutama G. trilobus dan G. ruber. Sedangkan foraminifera bentonik didominasi oleh subordo Rotaliina, dan yang paling banyak ditemukan adalah genus Cibicidiodes dan Lenticulina. Keanekaragaman foraminifera planktonik dan bentonik termasuk dalam kategori tinggi dengan kisaran antara 0.82 – 0.90 (planktonik) dan 0.79 – 0.95 (bentonik). Kemerataan foraminifera planktonik dan bentonik juga termasuk dalam kategori tinggi dengan kisaran antara 0.83 – 0.99 (planktonik) dan 0.82–0.99 (bentonik). Sedangkan untuk dominasi foraminifera planktonik dan bentonik berada dalam kategori rendah dengan kisaran 0.10 – 0.18 (planktonik) dan 0.05 – 0.21 (bentonik). Hal ini menunjukkan bahwa Teluk Cendrawasih meskipun merupakan perairan yang semi tertutup, namun kondisinya masih sangat bagus bagi perkembangan foraminiferaKata Kunci : foraminifera, distribusi spasial, struktur komunitas, dan Teluk Cenderawasih A total of 20 marine sediment samples from Cenderawasih Bay waters have been used for foraminiferal study, . The purpose to describe the spatial distribution and structure of the foraminifera community in the waters of Cenderawasih Bay. The results indicate that marine sediments are composed of 7 genera and 13 species of planktonic foraminifera, and 57 genera and 87 species belong to benthic foraminifera. The most common planktonic foraminifera is Globigerinoides which is found in all location, particularly G. trilobus and G. ruber. Furthermore, benthonic foraminifera is dominated by subordo Rotaliina, particularly genera Cibicidoides and Lenticulina as the most common genera. Diversity of both Planktonic and benthonic foraminifera are categorized as high, the values are between 0.82 and 0.90, and between 0.79 and 0.95 respectively. Planktonic and benthonic foraminiferal evenness are also high with range value between 0.83 and 0.99 (planktonic), and between 0.82 and 0.99 (benthonic). In contrast, dominance of both foraminiferal type are low, between 0.10 and 0.18 for planktonic, and between 0.05 and 0.21 (benthonic).This indicates that despite a semi–enclosed bay, Cendrawasih Bay is still considered as a good environment for foraminiferal community. Keywords: foraminifera, spatial distribution, community structure, and Cenderawasih Bay.

Download Full-text