Spongivore
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A spongivore is an
animal Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motilit ...
anatomically and physiologically adapted to eating animals of the
phylum In biology, a phylum (; plural: phyla) is a level of classification or taxonomic rank below kingdom and above class. Traditionally, in botany the term division has been used instead of phylum, although the International Code of Nomenclature f ...
Porifera Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through th ...
, commonly called
sea sponges Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through ...
, for the main component of its diet. As a result of their diet, spongivore animals like the
hawksbill turtle The hawksbill sea turtle (''Eretmochelys imbricata'') is a critically endangered sea turtle belonging to the family Cheloniidae. It is the only extant species in the genus ''Eretmochelys''. The species has a global distribution, that is large ...
have developed sharp, narrow bird-like beak that allows them to reach within crevices on the reef to obtain sponges.


Examples

The
hawksbill turtle The hawksbill sea turtle (''Eretmochelys imbricata'') is a critically endangered sea turtle belonging to the family Cheloniidae. It is the only extant species in the genus ''Eretmochelys''. The species has a global distribution, that is large ...
is one of the few animals known to feed primarily on sponges. It is the only known spongivorous reptile. Sponges of various select species constitute up to 95% of the diets of
Caribbean The Caribbean (, ) ( es, El Caribe; french: la Caraïbe; ht, Karayib; nl, De Caraïben) is a region of the Americas that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean Se ...
hawksbill turtle populations. ''
Pomacanthus imperator The emperor angelfish (''Pomacanthus imperator'') is a species of marine angelfish. It is a reef-associated fish, native to the Indian and Pacific Oceans, from the Red Sea to Hawaii and the Austral Islands. This species is generally associated ...
'', the emperor angelfish; http://www.esajournals.org/doi/abs/10.1890/0012-9658(1998)079%5B1740:AIBSOA%5D2.0.CO;2 '' Lactophrys bicaudalis'', the spotted trunkfish; and ''
Stephanolepis hispidus ''Stephanolepis hispidus'', the planehead filefish, is a species of bony fish, a ray-finned fish in the family Monacanthidae. Description The planehead filefish grows to a maximum length of but is more typically about long. The colour is cry ...
,'' the filefish are known spongivorous coral reef fish. The rock beauty ''Holocanthus tricolor'' is also spongivorous, with sponges making up 96% of their diet. Certain species of
nudibranch Nudibranchs () are a group of soft-bodied marine gastropod molluscs which shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have been given colourful nicknames to matc ...
s are known to feed selectively on specific species of sponges.


Attacks and counter-attacks


Spongivore offense

The many defenses displayed by sponges means that their spongivores need to learn skills to overcome these defenses to obtain their food. These skills allow spongivores to increase their feeding and use of sponges. Spongivores have three primary strategies for dealing with sponge defenses: choice based on colour, able to handle secondary metabolites and brain development for memory. Choice based on colour was involved based on which sponge the spongivore would choose to eat. A spongivore would bite small sample of sponges and if they were unharmed that they would continue eating that specific sponge and then move on to another sponge of the same colour. Spongivores have adapted to be able to handle the
secondary metabolite Secondary metabolites, also called specialised metabolites, toxins, secondary products, or natural products, are organic compounds produced by any lifeform, e.g. bacteria, fungi, animals, or plants, which are not directly involved in the norm ...
s that sponges have. Therefore, spongivores are able to consume a variety of sponges without getting harmed. Spongivores also have enough brain development to be able to remember the same species of sponge it has eaten in the past and will continue to eat in the future.


Sponge defense

A sponge defense is a trait that increases a sponge fitness when faced with a spongivore. This is measured relative to another sponge that lacks the defensive trait. Sponge defenses increase survival and/or reproduction ( fitness) of sponges under pressure of predation from a spongivore. The use of structural and chemical strategies found in sponges are used to deter predation.Hill, M., Lopez, N., & Young, K. (2005). Anti-predator defenses in western North Atlantic sponges with evidence of enhanced defense through interactions between spicules and chemicals. ''Marine Ecology Progress Series,'' ''291'', 93–102. doi:10.3354/meps291093 One of the most common structural strategies that sponges have that prevents them from being consumed by predators is by having
spicules Spicules are any of various small needle-like anatomical structures occurring in organisms Spicule may also refer to: *Spicule (sponge), small skeletal elements of sea sponges *Spicule (nematode), reproductive structures found in male nematodes ( ...
. If a sponge contains spicules along with organic compounds, the likelihood of those sponges being consumed by spongivores decrease. Sponges have also developed
aposematism Aposematism is the advertising by an animal to potential predators that it is not worth attacking or eating. This unprofitability may consist of any defences which make the prey difficult to kill and eat, such as toxicity, venom, foul taste or ...
to help avoid predation. Spongivores have learned four things about sponges aposematism and they are as follows: # If it is poison some predators will not eat it # If It is conspicuously coloured, or advertises itself by means of some other signals; # Some predators avoid attacking it because of its signals # These conspicuous signals provide better protection to the individual or to its genes than would other (e.g. cryptic) signals. Unfortunately, sponges that live in the deep sea are not at an advantage due to their colour because most colour in the deep sea is lost.Pinet, P. R. (2016). ''Invitation to oceanography''. Burlington, MA: Jones et Bartlett Learning.


Impacts

Sponges play an important role in the benthic fauna throughout temperate, tropical and polar habitats.Bell, J. J. (2008). The functional roles of marine sponges. ''Estuarine, Coastal and Shelf Science,'' ''79''(3), 341–353. doi:10.1016/j.ecss.2008.05.002 If there is a high volume of predation it can effect bio erosion, reef creation, multiple habitats, other species and help with the nitrogen levels. Bio erosion that occurs in the production of reef sediments and the structural component of corals are partly produced by sponges, where solid carbonate is processed into smaller fragments and fine sediments. Sponges also play a role in increasing the survival of live coral on Caribbean reefs by binding fragments together and is expected to increase the rates of carbonate accretion. The coral reefs that contain higher amounts of sponges have better survival rate than the reefs with fewer sponges. Sponges can act as a stabilizer during storms as they help keep the reefs intact when presented with a strong currents. Sponges also grown between rocks and boulders, providing a more stable environment and lowering the disturbance levels. Sponges also provide habitats for other organisms to live in, without them, these organisms would not have a protected habitat. Scientist have discovered that sponges play an important role in the nitrogen cycle. There are low amounts of nitrogen found in the water around coral reefs and most of the nitrogen that is found it bound into particulate or dissolved organic matter. Before this dissolved organic matter is able to be used by other reef organisms it must undergo a series of microbial transformations. The nitrogen cycle that occurs in sponges are able to cycle the nitrogen back into the water column and can be used by other organisms, especially cyanobacteria. The cyanobacteria then can then fix the atmospheric nitrogen and then the sponges can use it. Therefore, if there is a high amount of spongivores present in an environment, it can affect other aspects of the environment besides sponges.


References

{{feeding Carnivory Sponge biology Animals by eating behaviors