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Animal phenology (CLIM 025) - Assessment published Sep 2008: Climatic warming has caused advancement in the life cycles of many animal groups, including frogs spawning, birds nesting and the arrival of migrant birds and butterflies. Seasonal advancement is particularly strong and rapid in the Arctic. Breeding seasons are lengthening, allowing extra generations of temperature-sensitive insects such as butterflies, dragonflies and pest species to be produced during the year. These trends are projected to continue as climate warming increases in the decades to come. Populations may explode if the young are not exposed to normal predation pressures. Conversely, populations may crash if the emergence of vulnerable young is not in synchrony with their main food source or if shorter hibernation times lead to declines in body condition.
Located in Data and maps › Indicators › Animal phenology
Animal phenology (CLIM 025) - Assessment published Nov 2012: Many animal groups have advanced their life-cycles in recent decades, including frogs spawning, birds nesting and the arrival of migrant birds and butterflies. This advancement is attributed primarily to a warming climate. The breeding season of many thermophilic insects (such as butterflies, dragonflies and bark beetles) has been lengthening, allowing more generations to be produced per year. The observed trends are expected to continue in the future but quantitative projections are rather uncertain.
Located in Data and maps › Indicators › Animal phenology
Trend in egg-laying dates of the Pied flycatcher across Europe: This map shows the trend in egg-laying dates of the Pied flycatcher across Europe (1980-2004). Dots: weather stations used to calculate changes in local egg-laying dates (derived from temperature data); triangles: location of Pied flycatcher laying date time series.
Located in Data and maps › Maps and graphs