This memory aid covers Memory Aids within Competition Adaptations for GCSE Biology. Topic 2: Competition Adaptations It is section 10 of 14 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Topic position
Section 10 of 14
Practice
15 questions
Recall
20 flashcards
Memory Aids
Adaptation types — "SBF" (Some Bears Fight):
- Structural — physical body features (fur, blubber, spines, streamlining)
- Behavioural — actions and patterns (migration, hibernation, nocturnal habits)
- Functional — internal chemistry (concentrated urine, toxin production, heat-stable enzymes)
Intra vs Inter — "Intra = Inside, Inter = In between": Intraspecific = inside the same species (like intranet = within one network). Interspecific = between different species (like international = between nations). Competition inside the same species is always stronger — they want identical things.
What animals compete for — "Food Water Space Mates" (FWSM = "Few Win, Some Miss"): Animals compete for Food, Water, Space/territory, and Mates. Plants compete for Light, Water, Space, and Minerals (LWSM).
Quick Check: Two species of finch live on the same island and both eat seeds. Over several generations, scientists observe that one species evolves a larger beak suited to large, hard seeds, while the other evolves a smaller beak suited to small, soft seeds. Using your knowledge of competition and natural selection, explain this observation.
Initially both species competed for the same seeds (interspecific competition). This competition reduced the survival of both species. Within each population, there was natural variation in beak size due to genetic differences. Individuals in species A with slightly larger beaks could access larger, harder seeds that species B could not eat — they faced less competition and had more food available, so they survived better and reproduced more. Over generations, larger beaks became more common in species A. Similarly, individuals in species B with smaller beaks specialised on small seeds, reducing competition with species A. Over generations, the two species evolved different niches through a process called character displacement. This reduces interspecific competition and allows both species to coexist.
Quick Check: A polar bear has thick white fur, a thick layer of subcutaneous fat (blubber), small ears, and large padded feet. For each feature, identify the type of adaptation (structural, behavioural, or functional) and explain how it improves survival in the Arctic.
Thick white fur — structural adaptation. Provides insulation, trapping air to reduce heat loss. White colour provides camouflage against snow, aiding hunting. Thick blubber — structural adaptation. A thick layer of fat beneath the skin acts as additional insulation and as an energy store during periods without food (e.g., summer when seal hunting is difficult). Small ears — structural adaptation. Reduces surface area to volume ratio, decreasing the rate of heat loss by radiation and conduction from the ears. Large padded feet — structural adaptation. Distributes weight over a larger area, preventing the bear from sinking into snow, and provides grip on ice. Note: all four are structural; behavioural examples for polar bears would include seasonal denning and hunting at seal breathing holes.
Quick Check: A student states: "If we introduce a new predator to an ecosystem, the prey population will simply adapt to avoid being caught." Evaluate this statement, explaining what would actually happen in the short term and long term.
The statement misunderstands adaptation. In the short term, individual prey cannot adapt — they either escape the predator or they do not, depending on their current characteristics. Introducing a new predator would immediately increase predation pressure on the prey population, causing its size to fall as more individuals are killed. Individuals with existing traits that help them escape (e.g., better camouflage, faster running speed, more cautious behaviour) would survive more often and reproduce more. Over many generations — potentially thousands of years — natural selection would favour these traits, making them more common in the population. This long-term change could be described as the population adapting, but it requires many generations of selection pressure, not an immediate response by individual organisms.