Two girls for every boy
... and females in polygynandrous societies over the intragroup sex ratio. Although a higher proportion of adult males is beneficial to female reproductive success, a finite number of breeding opportunities are shared by all the males in the group and the higher the ratio of males to females, the lower th ...
... and females in polygynandrous societies over the intragroup sex ratio. Although a higher proportion of adult males is beneficial to female reproductive success, a finite number of breeding opportunities are shared by all the males in the group and the higher the ratio of males to females, the lower th ...
Influence of Body Size and Population Density on
... successof free-drifting eggs. Sperm and eggs were collected less than 1 h before experiments were conducted by injecting urchins with KC1 and then collecting the released gametes with a pipet held directly above the gonopores. Sperm were kept in concentrated form (dry) and the eggs were placed in a ...
... successof free-drifting eggs. Sperm and eggs were collected less than 1 h before experiments were conducted by injecting urchins with KC1 and then collecting the released gametes with a pipet held directly above the gonopores. Sperm were kept in concentrated form (dry) and the eggs were placed in a ...
You Can`t Catch a Fish with a Robot
... depths and ‘burp’ me out to conduct research and return even though it had never been done before. To that end, I agreed to live in an undersea habitat for a week or two and explore the ocean daily to 76 m (250 ft) on air (not helox, but air!). These experiences were life—changing for me as they wer ...
... depths and ‘burp’ me out to conduct research and return even though it had never been done before. To that end, I agreed to live in an undersea habitat for a week or two and explore the ocean daily to 76 m (250 ft) on air (not helox, but air!). These experiences were life—changing for me as they wer ...
Fish and Shellfish of the South Atlantic and Gulf Coasts
... operations almost entirely to the waters close inshore. We do not know, with few exceptions, the areas where fish may congregate offshore, or whether such areas exist. We know very little of the life histories of some of the most important species of the region, so that we can only guess how large a ...
... operations almost entirely to the waters close inshore. We do not know, with few exceptions, the areas where fish may congregate offshore, or whether such areas exist. We know very little of the life histories of some of the most important species of the region, so that we can only guess how large a ...
Intercontinental Comparison of Fish Life History Strategies along a
... (following Webb 1984); behavior—substrate preference and vertical position; life history— longevity, age at maturation (female), length at maturation (female), total fecundity, egg size, spawning frequency, reproductive guild (following Balon 1975), and parental care (following Winemiller 1989); and ...
... (following Webb 1984); behavior—substrate preference and vertical position; life history— longevity, age at maturation (female), length at maturation (female), total fecundity, egg size, spawning frequency, reproductive guild (following Balon 1975), and parental care (following Winemiller 1989); and ...
Reef fish associations with sea urchins in an Atlantic
... represent 15 families, but associations are most frequent in Apogonidae (29 species), Gobioesocidae (12 species) and Gobiidae (10 species). Regarding the genera Diadema and Echinothrix, they were the urchins most commonly having fish associates, and the most important species was D. antillarum (Karp ...
... represent 15 families, but associations are most frequent in Apogonidae (29 species), Gobioesocidae (12 species) and Gobiidae (10 species). Regarding the genera Diadema and Echinothrix, they were the urchins most commonly having fish associates, and the most important species was D. antillarum (Karp ...
Mate choice inside an egg cell.
... Gorelick and Carpinone 2009) and did not use sperm, but instead restored diploidy by either simply replicating all their chromosomes (endomitosis) or by the fusion of two haploid products of egg meiosis with one another. In such an ancestral condition, any invasion of the egg by another nucleus, a s ...
... Gorelick and Carpinone 2009) and did not use sperm, but instead restored diploidy by either simply replicating all their chromosomes (endomitosis) or by the fusion of two haploid products of egg meiosis with one another. In such an ancestral condition, any invasion of the egg by another nucleus, a s ...
Changes in Mediterranean rocky-reef fish assemblag
... no data on marine systems before impact, ‘after’ studies may nevertheless make it possible to analyse some aspects of the disturbance, although considerable care is needed in the interpretation of such results (Underwood 2000). The choice of the biotic component to be investigated is strictly depend ...
... no data on marine systems before impact, ‘after’ studies may nevertheless make it possible to analyse some aspects of the disturbance, although considerable care is needed in the interpretation of such results (Underwood 2000). The choice of the biotic component to be investigated is strictly depend ...
Meso- and bathypelagic fish interactions with seamounts and mid
... including CTD deployments, plankton net tows and pelagic nekton tows. Three different double-warp midwater trawls, two commercial ( Egersund and Åkra trawls) and one oceanographic ( Krill trawl), were used to sample from the surface to depths of 3000+ m, bottom depth permitting (see Sutton et al. in ...
... including CTD deployments, plankton net tows and pelagic nekton tows. Three different double-warp midwater trawls, two commercial ( Egersund and Åkra trawls) and one oceanographic ( Krill trawl), were used to sample from the surface to depths of 3000+ m, bottom depth permitting (see Sutton et al. in ...
REPRODUCTION - Teaching Biology Project
... Marine mammals and some fish e.g. sharks and rays also have internal fertilisation. Mating and copulation occurs. Most animals have cloaca – common opening for reproduction and egestion – during fertilisation cloacas are lined up. Male insects and mammals have a penis – organ to transfer sperm to bo ...
... Marine mammals and some fish e.g. sharks and rays also have internal fertilisation. Mating and copulation occurs. Most animals have cloaca – common opening for reproduction and egestion – during fertilisation cloacas are lined up. Male insects and mammals have a penis – organ to transfer sperm to bo ...
reproduction - Teaching Biology Project
... Marine mammals and some fish e.g. sharks and rays also have internal fertilisation. Mating and copulation occurs. Most animals have cloaca – common opening for reproduction and egestion – during fertilisation cloacas are lined up. Male insects and mammals have a penis – organ to transfer sperm to bo ...
... Marine mammals and some fish e.g. sharks and rays also have internal fertilisation. Mating and copulation occurs. Most animals have cloaca – common opening for reproduction and egestion – during fertilisation cloacas are lined up. Male insects and mammals have a penis – organ to transfer sperm to bo ...
The largest relative testis size among primates and aseasonal
... paternity does not necessarily lead to relatively large testes (Sch€ ulke et al., 2004). For species with a polygynandrous mating system, body mass and testis size may increase towards the onset of the mating season (Kappeler, 1997a; Schmid and Kappeler, 1998). Most strepsirrhine primates do not sho ...
... paternity does not necessarily lead to relatively large testes (Sch€ ulke et al., 2004). For species with a polygynandrous mating system, body mass and testis size may increase towards the onset of the mating season (Kappeler, 1997a; Schmid and Kappeler, 1998). Most strepsirrhine primates do not sho ...
An overview of marine fisheries infrastructure and fish utilization
... schemes both in marine and inland sectors. The state has 300 km of coastline and 27,000 sq km continental shelf area, rich in pelagic fishery resources. Traditionally Karnataka coast is known as “mackerel coast”. The marine fisheries resource potential of the state has been estimated at 4.25 lakh me ...
... schemes both in marine and inland sectors. The state has 300 km of coastline and 27,000 sq km continental shelf area, rich in pelagic fishery resources. Traditionally Karnataka coast is known as “mackerel coast”. The marine fisheries resource potential of the state has been estimated at 4.25 lakh me ...
Katy Did, Katy Didn`t
... tale says that the first night of katydid singing predicts the first autumn frost, which would arrive six weeks later in the northern part of its range to three months later in the south. For this reason, katydids are also occasionally called frost bugs. There are about 30 species of katydids in our ...
... tale says that the first night of katydid singing predicts the first autumn frost, which would arrive six weeks later in the northern part of its range to three months later in the south. For this reason, katydids are also occasionally called frost bugs. There are about 30 species of katydids in our ...
When does this fish spawn? Fishermen`s local knowledge of
... Notwithstanding its high relevance to fisheries management, reproductive patterns of tropical marine fishes are still poorly known, mainly due to the difficulties involved in studying marine fish reproduction (Sadovy 1996). Fishermen usually exploit fish schools (Parrish 1999) and fish spawning aggr ...
... Notwithstanding its high relevance to fisheries management, reproductive patterns of tropical marine fishes are still poorly known, mainly due to the difficulties involved in studying marine fish reproduction (Sadovy 1996). Fishermen usually exploit fish schools (Parrish 1999) and fish spawning aggr ...
Demersal Fishes and Megabenthic Invertebrates
... Almost 100% of the fish and 97% of the invertebrates counted were identified to species. Approximately 99% of the fish counted were measured. Measurement error was higher for biomass than for counts of individuals because biomass measurements were made on a moving boat. Anomalies audited in the fiel ...
... Almost 100% of the fish and 97% of the invertebrates counted were identified to species. Approximately 99% of the fish counted were measured. Measurement error was higher for biomass than for counts of individuals because biomass measurements were made on a moving boat. Anomalies audited in the fiel ...
Reproduction - Male
... results (>90% of the time) in Freemartin condition of heifer (Freemartinism). ...
... results (>90% of the time) in Freemartin condition of heifer (Freemartinism). ...
Glassy Fathers Do Matter: Egg Attendance Enhances Embryonic
... group continued to accumulate additional clutches during the time of the experiment, whereas all clutches except one in the experimental group were single clutches because males were removed right after the deposition of the first clutch. We did not remove additional clutches in the control group to ...
... group continued to accumulate additional clutches during the time of the experiment, whereas all clutches except one in the experimental group were single clutches because males were removed right after the deposition of the first clutch. We did not remove additional clutches in the control group to ...
The contribution of small individuals to density-body
... requirements may be directed disproportionately to maintenance rather than growth or reproduction in this group and therefore the ability to maintain high densities may be reduced. Furthermore, there are several lines of evidence to suggest that these smallest of reef fishes may not be accessing the ...
... requirements may be directed disproportionately to maintenance rather than growth or reproduction in this group and therefore the ability to maintain high densities may be reduced. Furthermore, there are several lines of evidence to suggest that these smallest of reef fishes may not be accessing the ...
downloadable pdf - Office of Research
... Rodiles’ discovery is unusual, in part because the area where the fish was found is so well studied and in part because biologists have already described most large fishes for the simple reason that they tend to stick out more than others. Indeed, Rodiles says, the indigenous people who live near th ...
... Rodiles’ discovery is unusual, in part because the area where the fish was found is so well studied and in part because biologists have already described most large fishes for the simple reason that they tend to stick out more than others. Indeed, Rodiles says, the indigenous people who live near th ...
Androgens during development in a bird species with extremely
... accompanied by greater sex differences in maternal or endogenously produced androgen levels (Badyaev, 2002; Uller and Badyaev, 2009), with potential consequences for the joint evolution of sex bias and sex-specific maternal effects (e.g., Carranza, 2004; Uller, 2006; Uller and Badyaev, 2009). Materna ...
... accompanied by greater sex differences in maternal or endogenously produced androgen levels (Badyaev, 2002; Uller and Badyaev, 2009), with potential consequences for the joint evolution of sex bias and sex-specific maternal effects (e.g., Carranza, 2004; Uller, 2006; Uller and Badyaev, 2009). Materna ...
FISH SPECIES COMPOSITION IN SEAGRASS BEDS OF TANJUNG
... study, however only 15 families had very significant individual number. We ranked and scored the dominant families (in terms of individual numbers), and only five families: Apogonidae, Labridae, Syngnathidae, Pomacentridae and Serranidae were similar in relative and total abundance (Table 2). It ind ...
... study, however only 15 families had very significant individual number. We ranked and scored the dominant families (in terms of individual numbers), and only five families: Apogonidae, Labridae, Syngnathidae, Pomacentridae and Serranidae were similar in relative and total abundance (Table 2). It ind ...
tropical aquaculture
... around the globe is enhanced through aquaculture. The dwindling ocean catches have been ameliorated by production through aquaculture. Stocking of overfished/endangered sp Through breeding programs the status of overfished and endangered species can be ameliorated. Aquaculture breeding tool is in ...
... around the globe is enhanced through aquaculture. The dwindling ocean catches have been ameliorated by production through aquaculture. Stocking of overfished/endangered sp Through breeding programs the status of overfished and endangered species can be ameliorated. Aquaculture breeding tool is in ...
Epipelagic fish
... Though the number of species is limited, epipelagic fishes are abundant. What they lack in diversity they make up in numbers. Forage fish occur in huge numbers, and large fish that predate on them are often sought after as premier food fish. As a group, epipelagic fishes form the most valuable fishe ...
... Though the number of species is limited, epipelagic fishes are abundant. What they lack in diversity they make up in numbers. Forage fish occur in huge numbers, and large fish that predate on them are often sought after as premier food fish. As a group, epipelagic fishes form the most valuable fishe ...
RAT DISSECTION PHYLUM: Chordata
... area. This is the DIGESTIVE GLAND that surrounds the STOMACH. This gland makes digestive substance called BILE which helps the intestine break down FATS in food. Extending from the stomach is a long coiled INTESTINE. Food enters the stomach where digestion begins with the addition of bile and grindi ...
... area. This is the DIGESTIVE GLAND that surrounds the STOMACH. This gland makes digestive substance called BILE which helps the intestine break down FATS in food. Extending from the stomach is a long coiled INTESTINE. Food enters the stomach where digestion begins with the addition of bile and grindi ...
Fish reproduction
Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused. There may also be a range of secondary organs that increase reproductive fitness. The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish often can be determined by the shape of its papilla.