Citation:

PANGAEA.942667

Name: Gut content of Tripneustes gratilla in Changuu Island (Unguja Island, Zanzibar Archipelago, Tanzania)
Published: 2022-03-24
License: https://creativecommons.org/licenses/by/4.0/
Keywords: grazing; seagrass traits; sea urchin; tropical seagrass

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Abstract:

To determine the gut content of T. gratilla, we sampled 10 sea urchins along a transect parallel to the coastline and transported them to the Institute of Marine Sciences (Stone Town, Zanzibar). The urchins were collected upon encounter along the transect with the rule of not collecting urchins from the same seagrass patch. This rule was applied to avoid bias towards specific seagrass species. For this analysis, we weighed the sea urchins, measured their diameter to the nearest millimeter with a ruler, and stored them in a 90% ethanol solution. For the gut content analysis, the sea urchins were opened and the content from the whole digestive tract was extracted. The gut content was placed in a Petri dish, and then transferred to a 250 µm mesh to remove the sediment. After the sediment removal, we weighed the gut content fresh weight. Approximately 1 gram (fresh weight) was taken as a sub-sample from the gut content and placed in a new Petri dish to observe under the magnifying glass. Each sample was compared to an example of seagrass material that was prepared specifically for identification after the grazing and digestion process of each species. We imitated this effect by grinding the seagrass species to a similar size and storing them in 90% ethanol solution. Using this method, we could separate the gut contents into the different seagrass species. Contents were then dried in the oven at 60 degrees for 24 hours to obtain their dry weight, and percentage of each seagrass species in the gut was calculated.

Keyword(s):

grazing; seagrass traits; sea urchin; tropical seagrass

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

Funding:

German Research Foundation (DFG), grant/award no. DFG TE 1046/3-1: Seagrass and Macroalgal Community Dynamics and Performance under Environmental Change (SEAMAC)

Coverage:

Latitude: -6.117806 * Longitude: 39.167383

Date/Time Start: 2016-01-15T00:00:00 * Date/Time End: 2016-01-15T00:00:00

Minimum Elevation: 0.0 m * Maximum Elevation: 0.0 m

Event(s):

Unguja_Island_Changuu2 * Latitude: -6.117806 * Longitude: 39.167383 * Date/Time: 2016-01-15T00:00:00 * Elevation: 0.0 m * Location: Zanzibar Archipealgo, Tanzania * Method/Device: Biodiversity mapping (BIOMAP) * 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	Site	Site		Moreira-Saporiti, Agustín
2	Identification	ID		Moreira-Saporiti, Agustín		Tripneustes gratilla ID
3	Tripneustes gratilla, diameter	T. gratilla diam	cm	Moreira-Saporiti, Agustín	see description in data abstract
4	Tripneustes gratilla, weight	T. gratilla w	g	Moreira-Saporiti, Agustín	see description in data abstract
5	Tripneustes gratilla, gut content, wet mass	T. gratilla gut cont wm	g	Moreira-Saporiti, Agustín	see description in data abstract
6	Tripneustes gratilla, gut content, dry mass	T. gratilla gut cont dm	g	Moreira-Saporiti, Agustín	see description in data abstract
7	Gut content, wet mass	Gut cont wm	g	Moreira-Saporiti, Agustín	see description in data abstract	Subsample total
8	Gut content, dry mass	Gut cont dm	g	Moreira-Saporiti, Agustín	see description in data abstract	Subsample total
9	Gut content, dry mass	Gut cont dm	g	Moreira-Saporiti, Agustín	see description in data abstract	Subsample algae
10	Gut content, dry mass	Gut cont dm	g	Moreira-Saporiti, Agustín	see description in data abstract	Subsample other
11	Gut content, dry mass	Gut cont dm	g	Moreira-Saporiti, Agustín	see description in data abstract	Subsample other+algae
12	Gut content, dry mass	Gut cont dm	g	Moreira-Saporiti, Agustín	see description in data abstract	Subsample seagrass
13	Species	Species		Moreira-Saporiti, Agustín		Seagrass species in gut
14	Gut content, dry mass	Gut cont dm	g	Moreira-Saporiti, Agustín	see description in data abstract	Subsample seagrass species
15	Seagrass in gut, dry mass	Seagr in gut dm	%	Moreira-Saporiti, Agustín	see description in data abstract

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

750 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Site	2 ID (Tripneustes gratilla ID)	3 T. gratilla diam [cm]	4 T. gratilla w [g]	5 T. gratilla gut cont wm [g]	6 T. gratilla gut cont dm [g]	7 Gut cont wm [g] (Subsample total)	8 Gut cont dm [g] (Subsample total)	9 Gut cont dm [g] (Subsample algae)	10 Gut cont dm [g] (Subsample other)	11 Gut cont dm [g] (Subsample other+algae)	12 Gut cont dm [g] (Subsample seagrass)	13 Species (Seagrass species in gut)	14 Gut cont dm [g] (Subsample seagrass species)	15 Seagr in gut dm [%]
Changuu2	1	7.1	151.53	18.89	1.1235	0.72	0.0307	0.0068	0.0068	0.0136	0.0171	Thalassia hemprichii	0.0023	13.450292400
Changuu2	2	7.7	168.10	26.23	1.8771	0.76	0.0406	0.0063	0.0063	0.0126	0.0280	Thalassia hemprichii	0.0012	4.285714286
Changuu2	3	7.9	209.46	25.41	1.4836	0.99	0.0426	0.0007	0.0082	0.0089	0.0337	Thalassia hemprichii	0.0009	2.670623145
Changuu2	4	8.1	211.72	27.52	1.7226	0.76	0.0280	0.0013	0.0012	0.0025	0.0255	Thalassia hemprichii	0.0001	0.392156863
Changuu2	5	7.4	149.98	17.99	1.2469	0.80	0.0410	0.0088	0.0068	0.0156	0.0254	Thalassia hemprichii	0.0032	12.598425200
Changuu2	6	8.1	182.38	20.04	1.6217	0.96	0.0420	0.0057	0.0133	0.0190	0.0230	Thalassia hemprichii	0.0013	5.652173913
Changuu2	7	7.9	180.72	31.20	2.4737	0.67	0.0265	0.0035	0.0034	0.0069	0.0196	Thalassia hemprichii	0.0017	8.673469388
Changuu2	8	8.8	213.42	22.87	1.3358	0.98	0.0531	0.0083	0.0114	0.0197	0.0334	Thalassia hemprichii	0.0027	8.083832335
Changuu2	9	8.6	187.97	22.38	1.3596	2.28	0.1727	0.0101	0.0883	0.0984	0.0743	Thalassia hemprichii	0.0065	8.748317631
Changuu2	10	6.8	132.98	13.52	0.7295	0.94	0.0474	0.0054	0.0068	0.0122	0.0352	Thalassia hemprichii	0.0031	8.806818182
Changuu2	1	7.1	151.53	18.89	1.1235	0.72	0.0307	0.0068	0.0068	0.0136	0.0171	Syringodium isoetifolium	0.0043	25.146198830
Changuu2	2	7.7	168.10	26.23	1.8771	0.76	0.0406	0.0063	0.0063	0.0126	0.0280	Syringodium isoetifolium	0.0083	29.642857140
Changuu2	3	7.9	209.46	25.41	1.4836	0.99	0.0426	0.0007	0.0082	0.0089	0.0337	Syringodium isoetifolium	0.0056	16.617210680
Changuu2	4	8.1	211.72	27.52	1.7226	0.76	0.0280	0.0013	0.0012	0.0025	0.0255	Syringodium isoetifolium	0.0036	14.117647060
Changuu2	5	7.4	149.98	17.99	1.2469	0.80	0.0410	0.0088	0.0068	0.0156	0.0254	Syringodium isoetifolium	0.0067	26.377952760
Changuu2	6	8.1	182.38	20.04	1.6217	0.96	0.0420	0.0057	0.0133	0.0190	0.0230	Syringodium isoetifolium	0.0171	74.347826090
Changuu2	7	7.9	180.72	31.20	2.4737	0.67	0.0265	0.0035	0.0034	0.0069	0.0196	Syringodium isoetifolium	0.0053	27.040816330
Changuu2	8	8.8	213.42	22.87	1.3358	0.98	0.0531	0.0083	0.0114	0.0197	0.0334	Syringodium isoetifolium	0.0091	27.245508980
Changuu2	9	8.6	187.97	22.38	1.3596	2.28	0.1727	0.0101	0.0883	0.0984	0.0743	Syringodium isoetifolium	0.0242	32.570659490
Changuu2	10	6.8	132.98	13.52	0.7295	0.94	0.0474	0.0054	0.0068	0.0122	0.0352	Syringodium isoetifolium	0.0181	51.420454550
Changuu2	1	7.1	151.53	18.89	1.1235	0.72	0.0307	0.0068	0.0068	0.0136	0.0171	Thalassodendron ciliatum	0.0090	52.631578950
Changuu2	2	7.7	168.10	26.23	1.8771	0.76	0.0406	0.0063	0.0063	0.0126	0.0280	Thalassodendron ciliatum	0.0173	61.785714290
Changuu2	3	7.9	209.46	25.41	1.4836	0.99	0.0426	0.0007	0.0082	0.0089	0.0337	Thalassodendron ciliatum	0.0272	80.712166170
Changuu2	4	8.1	211.72	27.52	1.7226	0.76	0.0280	0.0013	0.0012	0.0025	0.0255	Thalassodendron ciliatum	0.0218	85.490196080
Changuu2	5	7.4	149.98	17.99	1.2469	0.80	0.0410	0.0088	0.0068	0.0156	0.0254	Thalassodendron ciliatum	0.0134	52.755905510
Changuu2	6	8.1	182.38	20.04	1.6217	0.96	0.0420	0.0057	0.0133	0.0190	0.0230	Thalassodendron ciliatum	0.0038	16.521739130
Changuu2	7	7.9	180.72	31.20	2.4737	0.67	0.0265	0.0035	0.0034	0.0069	0.0196	Thalassodendron ciliatum	0.0126	64.285714290
Changuu2	8	8.8	213.42	22.87	1.3358	0.98	0.0531	0.0083	0.0114	0.0197	0.0334	Thalassodendron ciliatum	0.0191	57.185628740
Changuu2	9	8.6	187.97	22.38	1.3596	2.28	0.1727	0.0101	0.0883	0.0984	0.0743	Thalassodendron ciliatum	0.0389	52.355316290
Changuu2	10	6.8	132.98	13.52	0.7295	0.94	0.0474	0.0054	0.0068	0.0122	0.0352	Thalassodendron ciliatum	0.0099	28.125000000
Changuu2	1	7.1	151.53	18.89	1.1235	0.72	0.0307	0.0068	0.0068	0.0136	0.0171	Cymodocea serrulata	0.0015	8.771929825
Changuu2	2	7.7	168.10	26.23	1.8771	0.76	0.0406	0.0063	0.0063	0.0126	0.0280	Cymodocea serrulata	0.0012	4.285714286
Changuu2	3	7.9	209.46	25.41	1.4836	0.99	0.0426	0.0007	0.0082	0.0089	0.0337	Cymodocea serrulata	0.0000	0.000000000
Changuu2	4	8.1	211.72	27.52	1.7226	0.76	0.0280	0.0013	0.0012	0.0025	0.0255	Cymodocea serrulata	0.0000	0.000000000
Changuu2	5	7.4	149.98	17.99	1.2469	0.80	0.0410	0.0088	0.0068	0.0156	0.0254	Cymodocea serrulata	0.0021	8.267716535
Changuu2	6	8.1	182.38	20.04	1.6217	0.96	0.0420	0.0057	0.0133	0.0190	0.0230	Cymodocea serrulata	0.0008	3.478260870
Changuu2	7	7.9	180.72	31.20	2.4737	0.67	0.0265	0.0035	0.0034	0.0069	0.0196	Cymodocea serrulata	0.0000	0.000000000
Changuu2	8	8.8	213.42	22.87	1.3358	0.98	0.0531	0.0083	0.0114	0.0197	0.0334	Cymodocea serrulata	0.0025	7.485029940
Changuu2	9	8.6	187.97	22.38	1.3596	2.28	0.1727	0.0101	0.0883	0.0984	0.0743	Cymodocea serrulata	0.0000	0.000000000
Changuu2	10	6.8	132.98	13.52	0.7295	0.94	0.0474	0.0054	0.0068	0.0122	0.0352	Cymodocea serrulata	0.0041	11.647727270
Changuu2	1	7.1	151.53	18.89	1.1235	0.72	0.0307	0.0068	0.0068	0.0136	0.0171	Halodule uninervis	0.0000	0.000000000
Changuu2	2	7.7	168.10	26.23	1.8771	0.76	0.0406	0.0063	0.0063	0.0126	0.0280	Halodule uninervis	0.0000	0.000000000
Changuu2	3	7.9	209.46	25.41	1.4836	0.99	0.0426	0.0007	0.0082	0.0089	0.0337	Halodule uninervis	0.0000	0.000000000
Changuu2	4	8.1	211.72	27.52	1.7226	0.76	0.0280	0.0013	0.0012	0.0025	0.0255	Halodule uninervis	0.0000	0.000000000
Changuu2	5	7.4	149.98	17.99	1.2469	0.80	0.0410	0.0088	0.0068	0.0156	0.0254	Halodule uninervis	0.0000	0.000000000
Changuu2	6	8.1	182.38	20.04	1.6217	0.96	0.0420	0.0057	0.0133	0.0190	0.0230	Halodule uninervis	0.0000	0.000000000
Changuu2	7	7.9	180.72	31.20	2.4737	0.67	0.0265	0.0035	0.0034	0.0069	0.0196	Halodule uninervis	0.0000	0.000000000
Changuu2	8	8.8	213.42	22.87	1.3358	0.98	0.0531	0.0083	0.0114	0.0197	0.0334	Halodule uninervis	0.0000	0.000000000
Changuu2	9	8.6	187.97	22.38	1.3596	2.28	0.1727	0.0101	0.0883	0.0984	0.0743	Halodule uninervis	0.0047	6.325706595
Changuu2	10	6.8	132.98	13.52	0.7295	0.94	0.0474	0.0054	0.0068	0.0122	0.0352	Halodule uninervis	0.0000	0.000000000