Seagrass macroinvertebrate bycatches of the mosquito net trawl fishery in the Bay of Toliara, Madagascar (2018-2019): survey data and code

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Seagrass macroinvertebrate bycatches of the mosquito net trawl fishery in the Bay of Toliara, Madagascar (2018-2019): survey data and code
Herinirina, Patricia; Léopold, Marc; Frouin, Patrick; Bigot, Lionel; Randriatsara, Roddy Michel, 2023, "Seagrass macroinvertebrate bycatches of the mosquito net trawl fishery in the Bay of Toliara, Madagascar (2018-2019): survey data and code", https://doi.org/10.23708/8XPDJE, DataSuds, V1, UNF:6:IHdA2gxWS5gA5D4vJ4HhSg== [fileUNF]
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Description

The bay of Toliara (Madagascar) shelters diverse macroinvertebrate communities in seagrass beds.

This study aims to improve the knowledge of the diversity, abundance, and socioeconomic role of the seagrass macrobenthos in that area. We studied the mosquito net trawl fishery in seagrass areas in the Bay through the GPS tracking of fishers in 2018-2019. Catches were monitored through monthly landing surveys to characterize spatial temporal patterns in the abundance and diversity of macroinvertebrates in the seagrass beds.

Temporal effects (tide (spring/neap), months, and interaction terms) on the mean density and biomass of macroinvertebrate taxa were investigated through a generalized linear model (GLM) using the function « lm » (with a Poisson distribution) of the R software v.3.6.3.

We provide here i) the survey data on seagrass macroinvertebrates collected in 2018-2019 in the Bay of Toliara, Madagascar using fishers' mosquito net trawls and ii) the R code used for statistical processing.

(2023-04-26)
Subject Earth and Environmental Sciences
Keyword species, abundance, biomass, GPS track, small-scale fishery, fishing data
Related Publication Herinirina, P., Bigot, L., Frouin, P., Volandrae, H., Randriatsara, R., Behivoke, F., Ranivoarivelo, L., Léopold, M. (2023). Seagrass macroinvertebrate bycatches support mosquito net trawl fishery in Madagascar. Aquatic Living Resources. 36. doi: 10.1051/alr/2023014
Notes Kind of Data: Aggregate data
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1_ReadMe.txt
Macroinvertebrate_bycatches_Madagascar_2018-2019/Plain Text - 1.3 KB
Published May 31, 2023
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MD5: cb9f7f5c374592dfe1f9ef794f7c5348
Dataset citation and description
Documentation
Preview "Macroinvertebrate_bycatches_Madagascar_2018-2019/1_ReadMe.txt"
data_FINAL.tab
Macroinvertebrate_bycatches_Madagascar_2018-2019/Tabular Data - 852.0 KB
Published May 31, 2023
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26 Variables, 4905 Observations UNF:6:T5GpajBd46hyTZVCX8Mmzw==
The following variables are included: sheet_number;date_echg;code_village;code_engin (gear type code);code_pecheur (fisher code);Maree (VE srping tide, ME neap tide);Site;Pecheur (fisher);code_Ech;Families;Species;ID_Photo;cap_tot_gross;Sample_weight (g);Abundance(n);Weight (g);trawl_tow_per_trip_Dt(m);Slope (q);length_of_each_gear_Lt(m);Horizontal_opening_Lm (m);swept_area (m2);swept_area(km2);Density(ind/ha);Extrapolated_density (ind/ha);Biomass (g/ha);Extrapolated_Biomass (kg/km2)
Data
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GLM_VF.R
Macroinvertebrate_bycatches_Madagascar_2018-2019/R Syntax - 11.0 KB
Published May 31, 2023
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MD5: 872eae6ac6ebfbe5cb16e7192e2b32e8
R code of the GLM (General Linear Model) procedure used for processing the macroinvertebrate abundance data at the family taxonomic level
Code
Preview "Macroinvertebrate_bycatches_Madagascar_2018-2019/GLM_VF.R"
Macroinvertebrate_data_dictionary.tab
Macroinvertebrate_bycatches_Madagascar_2018-2019/Tabular Data - 1.8 KB
Published May 31, 2023
14 Downloads
3 Variables, 25 Observations UNF:6:65uVVY8WBme9dTvzfYyt8Q==
Data dictionary
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Preview "Macroinvertebrate_bycatches_Madagascar_2018-2019/Macroinvertebrate_data_dictionary.tab"
Rapport_final_Master_2_Patricia Herinirina.pdf
Rapport_final_Master_2_Patricia Herinirina.pdf
Macroinvertebrate_bycatches_Madagascar_2018-2019/Adobe PDF - 1.9 MB
Published May 31, 2023
16 Downloads
MD5: 72574368800fe9e295b12a1aa25c309a
Herinirina, Patricia (2019) "Etude de la macrofaune benthique exploitée par la petite pêche dans les herbiers littoraux de la baie de Toliara (sud-ouest de Madagascar)", Master of Science thesis (in French, 56 pages).
Documentation
Preview "Macroinvertebrate_bycatches_Madagascar_2018-2019/Rapport_final_Master_2_Patricia Herinirina.pdf"
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