Examkin

Soru

Zorluk: ZorAgricultural Systems, Crop Production, and Pastoralism in Nigeria

During the onset of the rainy season in Nigeria, nomadic Fulani pastoralists migrate with their zebu cattle herds away from the moist vegetation of the Middle Belt back toward the drier Sudan savanna of the Far North. What is the primary environmental factor driving this northward transhumance during the wet season?

  1. The seasonal surge of tsetse fly populations in humid southern zones, which increases the incidence of trypanosomiasis among cattle.Cevap
  2. B
    The preference of zebu cattle for consuming withered, low-moisture pasture rather than fresh, nutrient-dense green forage.
  3. C
    The total drying up of major river basins and Fadama floodplains in the Niger-Benue trough during rainy months.
  4. D
    The requirement of prolonged sub-zero temperatures and high-altitude frost for successful zebu cattle reproduction.

Cevap

The primary environmental factor driving northward transhumance during the wet season is the seasonal surge of tsetse fly populations in humid southern zones, which increases the incidence of animal trypanosomiasis.
During the wet season, increased moisture and lush vegetation in the Middle Belt create optimal breeding conditions for tsetse flies, which transmit fatal animal trypanosomiasis (nagana) to zebu cattle. Consequently, pastoralists retreat to the drier Sudan savanna where open terrain and lower humidity suppress tsetse fly populations.

Adım Adım Çözüm

1
Analyze the seasonal migration pattern (transhumance) of pastoralists in Nigeria.
Pastoralists move south toward river valleys during the dry season for water and pasture, and return north during the wet season.
Understanding the environmental constraints in both ecological zones across seasons is necessary to pinpoint the migration cause.
2
Evaluate the environmental hazards present in the southern savanna/Middle Belt during the rainy season.
Increased rainfall and humidity promote dense vegetation growth, leading to heavy infestation by tsetse flies (vector of trypanosomiasis) and high humidity causing foot rot in zebu cattle.
Zebu cattle are highly susceptible to insect-borne diseases prevalent in humid, bush-covered environments.
3
Select the option that correctly identifies disease vector ecology as the decisive factor.
The risk of trypanosomiasis carried by tsetse flies in the wetter southern zones compels herdsmen to move cattle back to the drier, open northern savanna.
Drier northern savanna belts are natural low-risk environments for tsetse fly survival during the rainy season.

Anahtar Kavram

Transhumance and Environmental Determinants of Pastoralism in Nigeria
Tahmini Süre:2m 0s
Bu soruyu puanla

Konular

Agricultural Systems, Crop Production, and Pastoralism in Nigeria

Bu konudan daha fazla soru