IB Biology Topic D4.3.11 Increases to the Number of Insect Life Cycles Within a Year Due to Climate Change Revision Notes (HL)

IB Biology Topic D4.3.11 Increases to the Number of Insect Life Cycles Within a Year Due to Climate Change Revision Notes (HL) | RevisionDojo

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Warmer years give insects more generations, not just faster ones

A spruce forest under attack from tiny beetles shows how a warming climate lets insects fit more life cycles into a single year.

Heat speeds development, so insects squeeze in extra generations

Insects are ectothermic, meaning their body temperature and rate of development are set by the surrounding environment.
Warmer temperatures speed up their development, so each life cycle finishes faster.
When cycles finish faster, a species can complete more generations per year, an increase in its voltinism (the number of generations produced in a year).
1. A species that once fit one generation into a year may now fit two or more.

Example

The spruce bark beetle (Ips typographus) often needs a full year per generation in cool climates.
In warmer conditions it can complete a generation faster and fit a second one into the same year.

Synchronised emergence turns many small broods into one large outbreak

Warmer temperatures also synchronise insect populations, so adults emerge together in simultaneous waves rather than staggered trickles.

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Warmer years give insects more generations, not just faster ones

A spruce forest under attack from tiny beetles shows how a warming climate lets insects fit more life cycles into a single year.

Heat speeds development, so insects squeeze in extra generations

Insects are ectothermic, meaning their body temperature and rate of development are set by the surrounding environment.
Warmer temperatures speed up their development, so each life cycle finishes faster.
When cycles finish faster, a species can complete more generations per year, an increase in its voltinism (the number of generations produced in a year).
1. A species that once fit one generation into a year may now fit two or more.

Example

The spruce bark beetle (Ips typographus) often needs a full year per generation in cool climates.
In warmer conditions it can complete a generation faster and fit a second one into the same year.

Synchronised emergence turns many small broods into one large outbreak

Warmer temperatures also synchronise insect populations, so adults emerge together in simultaneous waves rather than staggered trickles.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D4.3.11: Increases to the Number of Insect Life Cycles Within a Year Due to Climate Change Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Warmer years give insects more generations, not just faster ones

Heat speeds development, so insects squeeze in extra generations

Synchronised emergence turns many small broods into one large outbreak

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Warmer years give insects more generations, not just faster ones

Heat speeds development, so insects squeeze in extra generations

Synchronised emergence turns many small broods into one large outbreak

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account