Clement Unit II

Sepals (Calyx)

The outermost floral whorl that protects the developing flower bud.

Petals (Corolla)

The floral whorl modified to serve as visual attractants for pollinators.

Stamen (Androecium)

The male reproductive structure of a flower, consisting of the anther (produces pollen) and filament.

Carpel (Gynoecium)

The female reproductive structure of a flower, containing the stigma (receives pollen), style (pollen tube pathway), and ovary.

Alternation of Generations

The plant life cycle that alternates between a multicellular diploid sporophyte and a multicellular haploid gametophyte.

Microsporogenesis

Meiosis in the anther that produces four haploid microspores from a diploid mother cell.

Microgametogenesis

Mitosis that transforms haploid microspores into a mature male gametophyte (pollen grain).

Megasporogenesis

Meiosis in the ovule that produces four haploid megaspores, typically with only one surviving.

Megagametogenesis

Three mitotic divisions of a surviving megaspore that create the female gametophyte (embryo sac) with 7 cells and 8 nuclei.

Double Fertilization

Process where one sperm fertilizes the egg to form a diploid zygote, and a second sperm fuses with two polar nuclei to form triploid endosperm.

Pollination

The mechanical transfer of pollen from the anther to a compatible stigma.

Fertilization

The actual fusion of male and female gametes to form a zygote.

Carbon Fertilization

Elevated $CO_2$ increases plant carbon biomass but dilutes nitrogen, forcing herbivores to consume more leaf area to survive.

Poikilotherms

Organisms, like insects, whose internal temperature and development rate are dictated by the ambient environmental temperature.

Diapause

A period of suspended development or dormancy in insects, often triggered by changes in photoperiod (day length).

Univoltine

Insects that have one generation per year and undergo obligate diapause.

Multivoltine

Insects that have multiple generations per year and undergo facultative diapause.

Species Distribution Models (SDMs)

Ecoinformatics tools that combine observed occurrence data with abiotic climate layers to predict an organism's geographic range.

Presence-Only Data

Biodiversity data showing only where an organism was found (e.g., iNaturalist, museum collections).

Presence-Absence Data

Biodiversity data showing both where an organism was found and explicitly where it was not found (e.g., structured checklist surveys).

Mutualism

An ecological interaction where both species benefit (+/+).

Commensalism

An ecological interaction where one species benefits (+) and the other is unaffected (0).

Parasitism

An ecological interaction where one species benefits (+) at the other's expense (-).

Predation

An ecological interaction where one organism consumes another, resulting in a benefit for one (+) and a cost for the other (-).

Competition

An ecological interaction where both species incur costs (-/-) while competing for limited resources.

Reciprocal Parasitism

The evolutionary view that mutualisms are interactions where organisms exploit each other, persisting only because the net gain remains positive.

Floral Constancy

The behavior where a pollinator repeatedly visits flowers of the exact same species during a foraging bout, ignoring other rewarding species.

Flower-Handling Hypothesis (Darwin)

The idea that insects remain faithful to one flower type to minimize the time and energy spent learning how to extract its rewards.

Speed-Accuracy Tradeoff

The foraging principle where insects must balance visiting flowers quickly (saving time but making mistakes) versus evaluating them carefully.

Deceit Pollination

A strategy where a plant attracts an animal using signals that promise a reward, but provides nothing in return.

Food Deception

An ancestral deceptive strategy mimicking nectar or pollen to attract a diverse array of foraging generalist insects.

Sexual Deception

A derived deceptive strategy mimicking female insect mating signals to attract specific males.

Pseudocopulation

The attempted mating behavior by a male insect on a sexually deceptive flower, often resulting in severe sperm wastage.

Haplodiploidy

A reproductive system where unfertilized eggs develop into males and fertilized eggs develop into females; exploited by sexually deceptive orchids to sustain their pollinator pool.

Pollinia

Compact, fused packets of thousands of pollen grains evolved by orchids to ensure massive pollen transfer during rare pollinator visits.

Pollinator-Mediated Selfing

An increased risk of inbreeding that occurs when pollinators repeatedly visit multiple flowers on the same highly rewarding plant.

Primary Nectar Robber

An organism that bites or pierces a new hole directly through the corolla base to steal nectar without transferring pollen.

Secondary Nectar Robber

An organism that steals nectar by using an existing hole created by a primary robber.

Nectar Thief

An organism that enters a flower through the normal opening to take nectar but fails to pollinate it due to its size or behavior.

Selective Seed Abortion

The plant mechanism of terminating developing seeds to reallocate limited resources, such as replenishing nectar stolen by robbers.

Phenology

The timing of biological events, such as when a plant flowers and when pollinators are active.

Pollination Syndrome

A combination of floral traits, such as color, shape, scent, and rewards, that are associated with a particular type of pollinator.

Convergent Evolution

When distantly related species independently evolve similar characteristics because they experience similar selective pressures.

Chemical Mimicry

When one organism imitates another organism's chemical signals to manipulate the behavior of a receiver.

Floral Bouquet

The specific mixture of volatile chemicals released by a flower to create its scent.

Apomixis

Asexual seed production, which researchers test for by placing nylon bags over flowers to exclude pollinators.

Ecoinformatics

A framework used to discover, manage, analyze, and visualize big data in biology and environmental science.

Obligate Outcrosser

A plant that cannot successfully reproduce through self-fertilization and strictly requires pollen from a different plant.

Antagonistic Coevolution

When two interacting species evolve opposing adaptations because their reproductive interests conflict, potentially creating an evolutionary arms race.

Resistance (to floral larceny)

Plant traits, such as thick floral tissues or secondary metabolites, that reduce the frequency or intensity of nectar robbing.

Tolerance (to floral larceny)

A plant's ability to maintain its reproductive success despite experiencing damage from nectar robbers.

Inbreeding Depression

The reduced fitness of offspring produced through self-fertilization compared to those produced through outcrossing.

Domatia

Small pockets or hair tufts on plants that provide shelter for beneficial mites.

Extrafloral Nectaries

Structures that produce nectar outside of flowers, often used to attract protective ants.

Trichomes

Hairlike structures on plant leaves and stems that provide physical defense, or chemical defense if they are glandular.

Tapetum

Nutritive tissue located inside the anther that supports developing pollen.

Base Working

A form of floral larceny where an insect reaches between petals at the base of the flower to steal nectar without touching reproductive organs.

Senita Cactus & Senita Moth

An obligate mutualism where the moth actively pollinates the flowers, but its larvae consume about 30% of the developing seeds as a metabolic cost.

Yucca & Yucca Moth

An obligate pollination mutualism where female moths actively pollinate and lay eggs; notably, some moth lineages have evolved into cheaters that lay eggs without pollinating.

Comastoma pulmonarium & Bombus kashmirensis

A self-pollinating plant and its bumblebee nectar robber; the robbing causes the plant to reallocate resources to replace nectar, leading to selective seed abortion.

Desert Willow (Chilopsis linearis) & Carpenter Bees

A system where carpenter bees act as nectar robbers and bumblebees act as legitimate pollinators; robbing does not reduce seed set and may actually increase outcrossing.

Clusia aff. sellowiana & Cockroaches

A nocturnal pollination system where a dioecious plant attracts cockroach pollinators using the chemical acetoin and a liquid secretion reward.

Cycads & Thrips

A gymnosperm pollination system using a push-pull mechanism driven by beta-myrcene, which attracts insects at low doses but repels them at toxic, heat-induced high doses.

Cryptostylis orchids & Lissopimpla excelsa wasps

A sexual deception system where the plant mimics a female insect, causing the male to attempt pseudocopulation and suffer severe sperm wastage.

Ophrys sphegodes & Andrena bees

A sexually deceptive orchid system that specifically mimics the sex pheromones of a female bee to attract male pollinators.

Corpse Flower / Dead Horse Arum

Plants that use carrion or dung mimicry to attract scavenging flies and beetles for pollination without providing a reward.

Ipomopsis aggregata & Bombus occidentalis

A system where short-tongued bumblebees act as primary nectar robbers because their mouthparts cannot reach the nectar through the plant's long tubular flowers.

Monarch Butterflies & Roadside Milkweed

An interaction altered by anthropogenic road salt, where plants absorb massive amounts of sodium, increasing the insect's thoracic muscle protein but risking fatal toxicity.

Antiaropsis decipiens

A plant demonstrating sex-dependent rewards, where male flowers offer rewards to attract pollinators but female flowers are completely deceitful.