Abstract
BackgroundThe Shelduck (Tadorna tadorna) is a characteristic waterbird species of inland wetlands in northeastern Algeria. Its wintering behavior in relation to changes of local abundances and foraging group density is poorly known.ObjectivesThis study aims at monitoring patterns of diurnal activities and the variation of behavioral time-budgets in relation to numbers of wintering Shelducks. We investigate temporal variations of diurnal activities across multiple-time scales and consider their interrelationships.MethodsAssessments of local population abundance were weekly surveyed during two wintering seasons (2010–2012), whereas diurnal activities (feeding, sleeping, swimming, preening, loafing, flying, courtship, and antagonism) were studied three times a month during seven hours (08:00–16:00) using the Scan method. Time budget variations of each behavioral activity were tested using nested ANOVAs following multiple time scales. Generalized linear mixed-effects models (GLMM) tested whether variations in diurnal activities were density-dependent.ResultsDuring the wintering season, Shelduck’s numbers followed a bell-shaped trend, which indicated that the species was typically a wintering migrant in Sabkha Djendli. The first individuals arrived onsite in October–November then numbers reached a peak in January (up to 2400 individuals in 2012) with steady density during December–February, afterward individuals left the site progressively until late April when the site is deserted. During both wintering seasons, diurnal activities were dominated by feeding (60%), followed by sleeping (12%) then swimming and preening with 9% and 8%, respectively. The rest of the activities (loafing, flying, courtship and antagonistic behaviors) had low proportions of time budget. ANOVAs showed that activity time budgets varied significantly following multiple time scales (year, season, month, day, semi-hour). Time budgets of diurnal activities during each wintering season were significantly interrelated. Correlations patterns between the two seasons were similar. GLMMs revealed that the variations of diurnal activities were not density-dependent, except for preening and swimming.ConclusionDuring the wintering season, habitats of Sabkha Djendli are important for waterbirds, including the Shelduck that used the lake mainly for food-foraging and resting. The 2400 individuals censused in mid-winter are important locally and at the North African scale. This stresses the need to strengthen the protection status of this wetland and mitigate degradation sources that threaten wintering waterfowl.
Highlights
The Shelduck (Tadorna tadorna) is a characteristic waterbird species of inland wetlands in northeastern Algeria
< 0.001 *** 0.193 ns Conclusions At Sabkha Djendli, the Shelduck has the status of a wintering migrant that frequents the site from September to April
Local abundance experiences a climax in mid-winter (December–February) with numbers that can reach up to 2400 individuals in January
Summary
The Shelduck (Tadorna tadorna) is a characteristic waterbird species of inland wetlands in northeastern Algeria. Wetlands play critical roles for waterbirds as breeding, foraging, wintering and flyway areas (Tamisier and Dehorter 1999; Samraoui and Samraoui 2008). For the conservation of waterbirds, Wetlands International (2012) conducted population estimates to determine the increase, stability or decrease trends of waterbird populations at flyways. Conservation biology has evolved over time while focusing on habitat management and identification of target species as well as monitoring their ecology and population dynamics to detect potential ecosystem disturbances (Chenchouni 2010c; Finlayson et al 2018). In Africa and Western Eurasia, Wetlands International is monitoring populations of over 60 species of Anatidae to estimate population size and delineate their biogeographic range boundaries (Delany and Scott 2002)
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