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Annual reports : Gruissan - étang de l'Ayrolle, 2021
Watchpoint
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Bird Reports
See cumulative daily totals and phenology graphs
 
Not available. This representation exists with one or all sites, one or all years and a single species.

Comparison of the duration of migration : This graph compares the duration of migration in number of days between different key percentages of migration. It is possible to compare several sites on the same graph.
Not available. This representation exists with one or all sites, one or all years and a single species.

Comparison of migration dates : This graph matches key percentages of migration with calendar days. It is possible to compare several sites in the same graph.
Not available. This representation exists with a single site, all years and a single species.

Interannual trend : This interannual graph represents the evolution between annual totals.
Not available. This representation exists with a single site, one or all years and a single species.

Phenological trend : This graph represents the evolution of the percentage of migration. Key percentages are indicated by vertical red bars.
Not available. This representation exists with a single site, all years and a single species.

Daily evolution : This interannual graph represents the trend of dates and key percentages of migration.
Not available. This representation exists with a single site, one or all years and a single species.

Totals by hour : This graph represents the distribution of the total number of birds by hour. When a specific year is chosen, the average of all the years of the migration watch is shown in grey.
Not available. This representation exists with a single site, one or all years and a single species.

Seasonal phenology : This graph represents the distribution of the daily passage total (the decadary total is symbolized by red bars). If a specific year is selected, the average of all years is shown in grey.
Not available. This representation exists with a single site, one or all years and a single species.

Relative migration : This graph represents the distribution in daily percentage of migration (percentage by decade being symbolized by red bars). If a specific year is chosen, the average of all years is shown in grey.
Not available. This representation exists with a single site, one or all years and a single species.

Seasonal phenology (decade) : This graph represents the migration total by decade. If a specific year is selected, the average of all years of the migration survey is shown in grey.
Not available. This representation exists with a single site, one or all years and a single species.

Hourly mean per decade : This graph shows the mean number of migrants per hour over ten-day periods. When a specific year is selected, the mean number of migrants calculated over all years of record is depicted in grey.
Not available. This representation exists with a single site, one or all years and a single species.

Seasonal phenology (5-day period) : This graph shows the numbers of migratory individuals over 5-day periods. If a specific year is selected, the average of all years is shown in grey.
Not available. This representation exists with a single site, one or all years and a single species.

Hourly mean per 5-day period : This graph shows the mean number of individuals per hour over 5-day periods. When a specific year is selected, the mean number of migrants calculated over all years of record is shown in grey.
Available. This representation exists with a single site, a single year and all the species.

Summary table : This graph represents the seasonal totals as well as the latest totals of the migration watch. The upper table represents the most significant species for the watchpoint.
Available. This representation exists with a single site, a single year and all the species.

Migration synthesis : This graph is representing migration periods for each species at the site in a given year
Available. This representation exists with one or all sites, one or all years and all the species.

Observation effort : This table shows the observer pressure at the watchpoint for all years or day by day for a selected year.
Not available. This representation exists with all sites combined, one or all years and a single species.

Distribution Map : This map shows the relative importance of the watchpoints for a selected species. The dots represent the number of individuals per season.

Period : from Monday, January 18th, 2021 until Wednesday, April 7th, 2021

Number of days of migration watch : 24
Number of hours of migration watch : 98h01

Number of birds : 34762
Wednesday  2021 07h15-19h45 07h15-19h45 - Duration : 12h30 
Waning Crescent (24 days) : Moonrise at 5h41 and moonset at 15h35
Sun : sunrise at 07h17 and sunset at 20h21
Day : dawn at 06h48 and dusk at 20h50
Comments :
07h15-19h45 : Dominique Clément, Jean-Luc Guillemenet
 The most significant species
Total
 Show the data Show phenology Common species Great Cormorant (Phalacrocorax carbo)
310
 Show the data Show phenology Common species Grey Heron (Ardea cinerea)
86
 Show the data Show phenology Common species Black Stork (Ciconia nigra)
8
 Show the data Show phenology Common species White Stork (Ciconia ciconia)
2771
 Show the data Show phenology Common species Black Kite (Milvus migrans)
1058
 Show the data Show phenology Common species Red Kite (Milvus milvus)
32
 Show the data Show phenology Common species Western Marsh Harrier (Circus aeruginosus)
441
 Show the data Show phenology Common species Eurasian Sparrowhawk (Accipiter nisus)
331
 Show the data Show phenology Common species Osprey (Pandion haliaetus)
21
 Show the data Show phenology Common species Common Kestrel (Falco tinnunculus)
521
 Show the data Show phenology Common species Merlin (Falco columbarius)
5
 Show the data Show phenology Common species Whimbrel (Numenius phaeopus)
21
 Show the data Show phenology Common species Black-headed Gull (Chroicocephalus ridibundus)
173
 Show the data Show phenology Common species Lesser Black-backed Gull (Larus fuscus)
65
 Show the data Show phenology Common species Sand Martin (Riparia riparia)
246
 Show the data Show phenology Common species Barn Swallow (Hirundo rustica)
5808
 Show the data Show phenology Common species Common House Martin (Delichon urbicum)
284
 Show the data Show phenology Common species Western Yellow Wagtail (Motacilla flava)
1568
 Show the data Show phenology Common species White Wagtail (Motacilla alba)
7901
 Show the data Show phenology Common species European Goldfinch (Carduelis carduelis)
178
 Show the data Show phenology Common species Common Linnet (Carduelis cannabina)
2777
  Daily total
88
migrants
2
migrants
1
migrant
111
migrants
147
migrants
1
migrant
26
migrants
22
migrants
6
migrants
105
migrants
1
migrant
9
migrants
14
migrants
1
migrant
2
migrants
374
migrants
27
migrants
186
migrants
13
migrants
2
migrants
361
migrants
 Other species
Total
 Show the data Common species Red-breasted Merganser (Mergus serrator)
44
 Show the data Common species Great Egret (Casmerodius albus)
11
 Show the data Common species Common / Lesser Kestrel (Falco naumanni / tinnu...)
84
 Show the data Common species Black-winged Stilt (Himantopus himantopus)
8
 Show the data Common species Grey Plover (Pluvialis squatarola)
307
 Show the data Common species unidentified Sandpiper / Stint (Calidris / Limi...)
810
  Daily total
3
migrants
4
migrants
21
migrants
1
migrant
83
migrants
810
migrants
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