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18 results on '"Tonra, Kaitlyn"'

1. Keystone Species

Author

Menge, Bruce A., primary, Tonra, Kaitlyn J., additional, Bachhuber, Silke M., additional, Feezell, Maya K., additional, Fulton-Bennett, Heather K., additional, Meunier, Zechariah D., additional, Freidenburg, Tess L., additional, and Iles, Alison C., additional

Published
2023
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3. Grazers and predators mediate the post-settlement bottleneck in Caribbean octocoral forests.

Author

Wells, Christopher D., Benz, Joseph, Tonra, Kaitlyn J., Anderson, Emily R., and Lasker, Howard R.

Subjects
CORALS, OCTOCORALLIA, SCLERACTINIA, PREDATORY animals, CORAL reefs & islands, CORAL declines
Abstract

In the Caribbean, reef-building scleractinian corals have declined precipitously and octocorals have emerged as one of their main successors. The success of octocorals and the formation of octocoral forests has been attributed to their continuing recruitment to reef habitats, as well as tolerance to pollution, reduced direct competition with scleractinians, and resistance and resilience to climatic events. Benthic grazers on coral reefs can facilitate the growth and recruitment of corals by reducing the abundance of competitive algal turfs and macroalgae. However, grazing can also hinder corals through sublethal damage to coral tissue and predation of recruits. We assessed the effects of grazing by fishes and the sea urchin Diadema antillarum as well as predation by mesofauna on octocoral recruitment through a series of manipulative in situ and ex situ experiments. Exposure to fish and urchin grazing significantly reduced the post-settlement survival of octocoral recruits, while turf-associated mesofauna did not significantly affect recruitment. We also found a positive relationship between octocoral recruitment and the abundance of turf algae, which may reflect the deleterious effect of grazing on both turf algae and octocoral recruits. These data suggest that grazers and predators mediate the bottleneck characteristic of recruitment, primarily through their effect on post-settlement survival. Thus, the declines in the abundance of grazing fishes and urchins throughout the Caribbean may have contributed to the increase in Caribbean octocoral abundance, concurrent with the loss of scleractinians. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Reattachment of octocoral polyps following a stress event and polyp bailout in sea tables in St. John, US Virgin Islands in August of 2019

Author

Wells, Christopher, Tonra, Kaitlyn, Wells, Christopher, and Tonra, Kaitlyn

Abstract

Dataset: Polyp Bailout, Reattachment of octocoral polyps following a stress event and polyp bailout in St. John, US Virgin Islands. Corals were collected in Round Bay, St. John, U.S. Virgin Islands on 14–15 July, 2019. The date range in this dataset is August 18-26, 2019 during the polyp stress event and reattachment in sea tables. The results publication for this dataset is Wells & Tonra (2021). For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/855852, NSF Division of Ocean Sciences (NSF OCE) OCE-1756381

Published
2021

7. Percent cover of living organisms on experimental tiles with different levels of turf algae cover during an in-situ experiment in St. John, US Virgin Islands in August and September of 2019

Author

Wells, Christopher, Martinez-Quintana, Angela, Tonra, Kaitlyn, Lasker, Howard, Wells, Christopher, Martinez-Quintana, Angela, Tonra, Kaitlyn, and Lasker, Howard

Abstract

Dataset: Turf Tile Cover, Percent cover of living organisms on experimental tiles of three treatments (scrubbed, reef, protected) determined using digital images of each tile taken on days 0, 19, and 57 after field deployment. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/855879, NSF Division of Ocean Sciences (NSF OCE) OCE-1756381

Published
2021

8. Polyp settlement and polyp counts on experimental tiles with different levels of turf algae cover during an in-situ experiment in St. John, US Virgin Islands in August and September of 2019.

Author

Wells, Christopher, Martinez-Quintana, Angela, Tonra, Kaitlyn, Lasker, Howard, Wells, Christopher, Martinez-Quintana, Angela, Tonra, Kaitlyn, and Lasker, Howard

Abstract

Dataset: Turf Polyp Counts, Polyp settlement and polyp counts on experimental tiles with different levels of turf algae cover (low: “scrubbed”; medium: “reef”; high: “protected”) up to 57 days after settlement. The in-situ experiment took place in Grootpan Bay, St. John, US Virgin Islands between August 3rd to September 9th, 2019. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/855867, NSF Division of Ocean Sciences (NSF OCE) OCE-1756381

Published
2021

9. Locations of mapped polyps on experimental tiles with different levels of turf algae cover during an in-situ experiment in St. John, US Virgin Islands in August and September of 2019

Author

Wells, Christopher, Martinez-Quintana, Angela, Tonra, Kaitlyn, Lasker, Howard, Wells, Christopher, Martinez-Quintana, Angela, Tonra, Kaitlyn, and Lasker, Howard

Abstract

Dataset: Turf Polyp Locations, Locations of mapped polyps on experimental tiles of three treatments (scrubbed, reef, protected). For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/855889, NSF Division of Ocean Sciences (NSF OCE) OCE-1756381

Published
2021

10. Cell counts for 11 P. homomalla embryos taken every 5-10 minutes from fertilization to 13 hours after fertilization from adult corals collected in Round Bay, St. John, USVI in July of 2019

Author

Tonra, Kaitlyn, Wells, Christopher, Lasker, Howard, Tonra, Kaitlyn, Wells, Christopher, and Lasker, Howard

Abstract

Dataset: P. homomalla development (fine), Cell counts for 11 Plexaura homomalla embryos taken every 5-10 minutes from fertilization to 13 hours after fertilization. Adult corals used in this study were collected in Round Bay, St. John, USVI on July 14–15, 2019. The results publication for this dataset is Tonra et al. (2021, see Fig. 3). For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/855801, NSF Division of Ocean Sciences (NSF OCE) OCE-1756381

Published
2021

11. Counts of individuals and cell division for 100 Plexaura homomalla embryos from fertilization to 24 hours after fertilization from adult corals collected in Round Bay, St. John, USVI in July of 2019

Author

Tonra, Kaitlyn, Wells, Christopher, Lasker, Howard, Tonra, Kaitlyn, Wells, Christopher, and Lasker, Howard

Abstract

Dataset: P. homomalla development (coarse), Counts of individuals and cell division for 100 Plexaura homomalla embryos from fertilization to 24 hours after fertilization. Adult corals used in this study were collected in Round Bay, St. John, USVI on July 14–15, 2019. The results publication for this dataset is Tonra et al. (2021, see Fig. 4). For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/855766, NSF Division of Ocean Sciences (NSF OCE) OCE-1756381

Published
2021

12. Embryogenesis, polyembryony, and settlement in the gorgonian Plexaura homomalla

Author

Wells, Christopher D., Tonra, Kaitlyn J., and Lasker, Howard R.

Subjects
Gorgonian, biology, Propagule, Ontogeny, Plexaura homomalla, fungi, Polyembryony, Zoology, Asexual reproduction, Population biology, biology.organism_classification, Full moon
Abstract

Understanding the ontogeny and reproductive biology of reef-building organisms can shed light on patterns of population biology and community structure. This knowledge is particularly important for Caribbean octocorals, which seem to be more resilient to long-term environmental change than scleractinian corals and provide some of the same ecological services. We monitored the development of the black sea rod Plexaura homomalla, a common, widely distributed octocoral on shallow Caribbean reefs, from eggs to 3-polyp colonies over the course of 73 days. In aquaria on St John, U.S. Virgin Islands, gametes were released in spawning events three to six days after the July full moon. Cleavage started 3 hours after fertilization and was holoblastic, equal, and radial. Embryos were positively buoyant until becoming planulae. Planulae were competent after 4 days. Symbiodiniaceae began infecting polyps at around 8 days post fertilization. Development was typical for Caribbean octocorals, except for the occurrence of a novel form of asexual reproduction in octocorals: polyembryony. Fragmentation of embryos during development may represent a temporally varied tradeoff between number and size of propagules, in which large eggs have higher fertilization rates followed by polyembryony, which maximizes the number of surviving recruits by generating more, albeit smaller, larvae. Polyembryony may contribute to the success of some gorgonians on Caribbean reefs as other anthozoans are in decline.

Published
2020
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18. Keystone Species

Author

Menge, Bruce A., Tonra, Kaitlyn J., Bachhuber, Silke M., Feezell, Maya K., Fulton-Bennett, Heather K., Meunier, Zechariah D., Freidenburg, Tess L., and Iles, Alison C.

Published
2017
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