Moreira-Saporiti, Agustín; Teichberg, Mirta (2022): Fish abundance in Changuu Island (Unguja Island, Zanzibar Archipelago, Tanzania) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.942665, In: Moreira-Saporiti, A; Teichberg, M (2022): Seagrass abundance and morphological, nutritional and biochemical traits in relation to sea urchin Tripneustes gratilla overgrazing [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.942667
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
We deployed underwater cameras (GoPro Hero3) to measure the abundance of predators of T. gratilla. According to previous literature, the main fish predators of T. gratilla in this region were Balistapus undulatus (Triggerfish, family Balistidae) and Cheilinus undulatus (Wrasse, family Labridae) (McClanahan and Muthiga, 1989; McClanahan and Shafir, 1990; Eklöf et al., 2009). Abundances of these predators in our study site were the main focus of these surveys.
We deployed the cameras in four sampling events: 22.07.2017 (three cameras), 07.08.2017 (seven cameras), 28.08.2017 (six cameras) and 30.09.2017 (six cameras). We deployed three cameras simultaneously, attached to a 50 cm tall wooden pole. Each camera recorded a mean (± standard error) of 53 ± 2 minutes and an area of 10 m2, resulting in a total of ~20 hours of video and a total surveyed area of ~220 m2. We used the maximum count method for counting fishes in the video surveys (Conn, 2011). We counted the fishes as the number of times they appear in the recorded area (i.e. if one fish left the area recorded and appeared again, it was counted as a new fish, as defined by Conn, 2011). This method was used to ensure that any predatory fish of T. gratilla would be detected despite the likely over-estimation of fish counts of abundant fish families. The fishes that appeared in the videos were screenshotted and identified using the fish identification guide developed by Allen et al. (2003). We created one category per fish family identified, two individual categories for the fish species that are predators of T. gratilla (B. undulatus and C. undulatus) and one category for unidentifiable fishes (generally due to suboptimal visibility). The final number of fishes is the individuals count.
Supplement to:
Moreira-Saporiti, Agustín; Hoeijmakers, Dieuwke; Reuter, Hauke; Msuya, Flower E; Gese, Katrin; Teichberg, Mirta (2023): Bottom‐up and top‐down control of seagrass overgrazing by the sea urchin Tripneustes gratilla. Marine Ecology, 44(1), e12734, https://doi.org/10.1111/maec.12734
Further details:
Conn, Paul B (2011): An evaluation and power analysis of fishery independent reef fish sampling in the Gulf of Mexico and U.S. South Atlantic. U.S. DEPARTMENT OF COMMERCE, NOAA technical memorandum NMFS-SEFSC
Eklöf, Johan S; Fröcklin, Sara; Lindvall, Annika; Stadlinger, Nadja; Kimathi, Alex; Uku, Jacqueline N; McClanahan, Tim R (2009): How effective are MPAs? Predation control and 'spill-in effects' in seagrass-coral reef lagoons under contrasting fishery management. Marine Ecology Progress Series, 384, 83-96, https://doi.org/10.3354/meps08024
McClanahan, Tim R; Muthiga, Nyawira A (1989): Patterns of preedation on a sea urchin, Echinometra mathaei (de Blainville), on Kenyan coral reefs. Journal of Experimental Marine Biology and Ecology, 126(1), 77-94, https://doi.org/10.1016/0022-0981(89)90125-1
McClanahan, Tim R; Shafir, S H (1990): Causes and consequences of sea urchin abundance and diversity in Kenyan coral reef lagoons. Oecologia, 83, 362-370, https://doi.org/10.1007/BF00317561
Coverage:
Latitude: -6.117806 * Longitude: 39.167383
Date/Time Start: 2017-07-22T00:00:00 * Date/Time End: 2017-09-30T00:00:00
Minimum Elevation: 0.0 m * Maximum Elevation: 0.0 m
Event(s):
Unguja_Island_Changuu4 * Latitude: -6.117806 * Longitude: 39.167383 * Date/Time: 2017-07-22T00:00:00 * Elevation: 0.0 m * Location: Zanzibar Archipealgo, Tanzania * Method/Device: Digital Camera, GoPro (GOPRO) * Comment: The sampling sites consisted of subtidal meadows (1-4 meters depth) of around 2500 square meters, delimited by the coastline and a fringing reef.
Unguja_Island_Changuu5 * Latitude: -6.117806 * Longitude: 39.167383 * Date/Time: 2017-08-07T00:00:00 * Elevation: 0.0 m * Location: Zanzibar Archipealgo, Tanzania * Method/Device: Digital Camera, GoPro (GOPRO) * Comment: The sampling sites consisted of subtidal meadows (1-4 meters depth) of around 2500 square meters, delimited by the coastline and a fringing reef.
Unguja_Island_Changuu6 * Latitude: -6.117806 * Longitude: 39.167383 * Date/Time: 2017-08-28T00:00:00 * Elevation: 0.0 m * Location: Zanzibar Archipealgo, Tanzania * Method/Device: Digital Camera, GoPro (GOPRO) * Comment: The sampling sites consisted of subtidal meadows (1-4 meters depth) of around 2500 square meters, delimited by the coastline and a fringing reef.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Moreira-Saporiti, Agustín | |||
| 2 | Site | Site | Moreira-Saporiti, Agustín | |||
| 3 | Time in minutes | Time | min | Moreira-Saporiti, Agustín | Video length | |
| 4 | Visibility | Visibility | Moreira-Saporiti, Agustín | |||
| 5 | Balistapus undulatus | B. undulatus | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 6 | Cheilinus undulatus | C. undulatus | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 7 | Balistidae | Balistidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 8 | Labridae | Labridae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 9 | Pomacentridae | Pomacentridae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 10 | Apogonidae | Apogonidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 11 | Lethrinidae | Lethrinidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 12 | Lutjanidae | Lutjanidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 13 | Siganidae | Siganidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 14 | Carangidae | Carangidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 15 | Sphyraena | Sphyraena | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 16 | Chaetodontidae | Chaetodontidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 17 | Mullidae | Mullidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 18 | Tetraodontidae | Tetraodontidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 19 | Monacanthidae | Monacanthidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 20 | Gobiidae | Gobiidae | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 21 | Fish school | Fish school | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | Small fish school |
| 22 | Pisces indeterminata | Pisces indet | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | |
| 23 | Pisces | Pisces | # | Moreira-Saporiti, Agustín | Counting fishes in the video surveys (Conn, 2011) | Total |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
484 data points